JPH0440624A - Polyester film for magnetic recording medium - Google Patents
Polyester film for magnetic recording mediumInfo
- Publication number
- JPH0440624A JPH0440624A JP14893990A JP14893990A JPH0440624A JP H0440624 A JPH0440624 A JP H0440624A JP 14893990 A JP14893990 A JP 14893990A JP 14893990 A JP14893990 A JP 14893990A JP H0440624 A JPH0440624 A JP H0440624A
- Authority
- JP
- Japan
- Prior art keywords
- film
- young
- modulus
- particles
- calcium carbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920006267 polyester film Polymers 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 93
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 55
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 23
- 238000000034 method Methods 0.000 description 19
- 229920000728 polyester Polymers 0.000 description 17
- 238000005299 abrasion Methods 0.000 description 15
- 239000002585 base Substances 0.000 description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000005809 transesterification reaction Methods 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 235000012211 aluminium silicate Nutrition 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000011146 organic particle Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- -1 phosphorus compound Chemical class 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 241001422033 Thestylus Species 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 2
- 235000011124 aluminium ammonium sulphate Nutrition 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- LCQXXBOSCBRNNT-UHFFFAOYSA-K ammonium aluminium sulfate Chemical compound [NH4+].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O LCQXXBOSCBRNNT-UHFFFAOYSA-K 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000010189 synthetic method Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 1
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 102100040160 Rabankyrin-5 Human genes 0.000 description 1
- 101710086049 Rabankyrin-5 Proteins 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- QEZIKGQWAWNWIR-UHFFFAOYSA-N antimony(3+) antimony(5+) oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[Sb+3].[Sb+5] QEZIKGQWAWNWIR-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000007771 core particle Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- ZJXZSIYSNXKHEA-UHFFFAOYSA-N ethyl dihydrogen phosphate Chemical compound CCOP(O)(O)=O ZJXZSIYSNXKHEA-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229940097364 magnesium acetate tetrahydrate Drugs 0.000 description 1
- XKPKPGCRSHFTKM-UHFFFAOYSA-L magnesium;diacetate;tetrahydrate Chemical compound O.O.O.O.[Mg+2].CC([O-])=O.CC([O-])=O XKPKPGCRSHFTKM-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- XTTGYFREQJCEML-UHFFFAOYSA-N tributyl phosphite Chemical compound CCCCOP(OCCCC)OCCCC XTTGYFREQJCEML-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- CYTQBVOFDCPGCX-UHFFFAOYSA-N trimethyl phosphite Chemical compound COP(OC)OC CYTQBVOFDCPGCX-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は均一な表面を有し、走行性及び耐摩耗性が高度
に改良された磁気記録媒体用ポリエステルフィルムに関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a polyester film for magnetic recording media that has a uniform surface and highly improved running properties and abrasion resistance.
〔従来の技術および発明が解決しようとする課題〕ポリ
エステルフィルムは物理的、化学的特性に優れ産業用基
材として広(用いられている。就中、二軸配向ポリエチ
レンテレフタレートフィルムは特に機械的強度、寸法安
定性、平面性等に優れることから磁気記録媒体のベース
フィルムとして今や必要不可欠なものとなっている。[Prior art and problems to be solved by the invention] Polyester films have excellent physical and chemical properties and are widely used as industrial base materials. In particular, biaxially oriented polyethylene terephthalate films have particularly high mechanical strength. Because of its excellent dimensional stability and flatness, it is now indispensable as a base film for magnetic recording media.
ところで近年特に長時間記録媒体においては、単位体積
当りの記録容量の増大を計るため、より薄いベースフィ
ルムが要求されている。この場合機械的特性の脆弱化を
補うために、単位断面積当りの強度のより大きいフィル
ムを用いることもしばしば行なわれる。Incidentally, in recent years, particularly in long-term recording media, thinner base films have been required in order to increase the recording capacity per unit volume. In this case, in order to compensate for the weakening of mechanical properties, a film with greater strength per unit cross-sectional area is often used.
しかしながら、本発明者らの知見したところによると、
上記した磁気記録媒体用ベースフィルムに要求される緒
特性、就中、走行性及び耐摩耗性はそのフィルムの厚み
が薄くなればなるほど、又機械的強度が強くなるほど悪
化する傾向にあり、かかる高密度記録用のベースフィル
ムにおける特性の改良が特に望まれていた。However, according to the findings of the present inventors,
The mechanical properties required for the above-mentioned base film for magnetic recording media, particularly running properties and abrasion resistance, tend to deteriorate as the film becomes thinner and as its mechanical strength increases. Improved properties in base films for density recording were particularly desired.
従来、ポリエステルフィルムの走行性及び耐摩耗特性を
改良する手段として、フィルム中に不活性な微粒子を存
在させフィルム表面を適度に粗らす方法が知られており
、ある程度その改良が為されているが、必ずしも充分な
結果は得られていない。Conventionally, as a means to improve the runnability and abrasion resistance properties of polyester films, a method has been known in which inert fine particles are present in the film to moderately roughen the film surface, and improvements have been made to some extent. However, sufficient results have not always been obtained.
例えば微粒子としてポリエステル製造時の触媒残渣等か
らのいわゆる析出粒子を用いた場合は、延伸により該微
粒子が破壊され易いため走行性や耐摩耗性が劣り、また
再生使用も困難である。For example, when so-called precipitated particles from catalyst residues during polyester production are used as fine particles, the fine particles are easily destroyed by stretching, resulting in poor runnability and abrasion resistance, and it is also difficult to reuse them.
また、カオリン、酸化ケイ素、二酸化チタン、リン酸カ
ルシウム等のポリエステルに不活性な無機化合物粒子を
添加した場合は、延伸により該粒子が破壊、変形される
ことはなく、比較約2、峻な突起を与えるため走行性は
改良されるが、通常その粒度分布が広いためしばしば粗
大突起に基因する電磁変換特性の悪化、ドロップアウト
の多発が認められるようになる。In addition, when inert inorganic compound particles are added to polyester such as kaolin, silicon oxide, titanium dioxide, calcium phosphate, etc., the particles are not destroyed or deformed by stretching, resulting in sharp protrusions. This improves running properties, but since the particle size distribution is usually wide, deterioration of electromagnetic conversion characteristics and frequent dropouts are often observed due to coarse protrusions.
この二律背反の現象を克服するため、近年シャープな粒
度分布を有する無機または有機の粒子を用いることが提
案されている。例えば特開昭62−207356号公報
、特開昭59−217755号公報にはそれぞれ単分散
性の酸化ケイ素、乳化重合法による架橋有機粒子が示さ
れている。しかしながらこの場合も酸化ケイ素粒子の場
合はその硬度が高いためフィルムが接触する基材を傷っ
け易いしまた架橋有機粒子の場合は延伸により粒子が変
形し易い点や耐熱性において難がある。In order to overcome this antinomy phenomenon, it has recently been proposed to use inorganic or organic particles having a sharp particle size distribution. For example, JP-A-62-207356 and JP-A-59-217755 disclose monodisperse silicon oxide and crosslinked organic particles produced by emulsion polymerization, respectively. However, in this case as well, silicon oxide particles have high hardness and can easily damage the substrate with which the film comes into contact, and crosslinked organic particles have problems in that they are easily deformed by stretching and have poor heat resistance.
このようにこれまで走行性および耐摩耗性を高度に満足
し、且つ必要な他の緒特性を兼ね備えた磁気記録用ポリ
エステルフィルムは得られていないのが実情である。As described above, the reality is that no polyester film for magnetic recording has been obtained that highly satisfies running properties and abrasion resistance and also has other necessary properties.
特にフィルムの走行速度や張力の点において厳しい環境
下にさらされる機械的強度の大きいフィルムについては
その改良が強く望まれていた。In particular, improvements have been strongly desired for films with high mechanical strength that are exposed to harsh environments in terms of running speed and tension.
本発明者らは、上記実情に鑑みて、特に高密度磁気記録
媒体用のポリエステルフィルムに関して鋭意検討を行な
った結果、縦方向、横方向のヤング率が共に400〜4
50 kg/mm2程度であるいわゆるバランスフィル
ムと異なり縦方向、横方向のいずれかにより強く配向し
たいわゆる異方性フィルムにおいてはある特定の炭酸カ
ルシウム粒子を含有せしめることが極めて効果的である
ことを知見し本発明を完成するに至った。In view of the above-mentioned circumstances, the inventors of the present invention have conducted intensive studies on polyester films for use in high-density magnetic recording media.
It was discovered that unlike the so-called balanced film, which has a particle size of about 50 kg/mm2, it is extremely effective to include certain calcium carbonate particles in the so-called anisotropic film, which is more strongly oriented in either the vertical or horizontal direction. This led to the completion of the present invention.
即ち本発明の要旨は、平均粒径が0.07〜1.5μm
で、下記式に定義する粒度分布値が1.60以下である
バテライト型炭酸カルシウム粒子を0.005〜2.0
重量%含有するフィルムであり、且つ該フィルムの縦方
向ヤング率と横方向ヤング率の和が900kg/mm”
以上、縦方向ヤング率と横方向ヤング率との差が100
kg/ Mffl”以上であることを特徴とする磁気
記録媒体用ポリエステルフィルムに存する。That is, the gist of the present invention is that the average particle size is 0.07 to 1.5 μm.
Then, vaterite type calcium carbonate particles having a particle size distribution value defined by the following formula of 1.60 or less are 0.005 to 2.0.
% by weight, and the sum of the longitudinal Young's modulus and the transverse Young's modulus of the film is 900 kg/mm"
Above, the difference between the longitudinal Young's modulus and the transverse Young's modulus is 100
The present invention relates to a polyester film for magnetic recording media, characterized in that it has a polyester film of at least 1 kg/Mffl".
(式中d 2S+ d 75は粒子群の積算体積を大
粒子側から計測し、それぞれ総体積の25%、75%に
相当する粒径(μm)を示す。)
以下、本発明を更に詳細に説明する。(In the formula, d 2S + d 75 indicates the particle diameter (μm) corresponding to 25% and 75% of the total volume, respectively, when the integrated volume of the particle group is measured from the large particle side.) Hereinafter, the present invention will be explained in more detail. explain.
本発明でいうポリエステルとは、テレフタル酸又はその
エステルと、エチレングリコールを主たる出発原料とし
て得られるポリエステルを指すが他の第三成分を含有し
てもかまわない。この場合、ジカルボン酸成分として、
例えばイソフタル酸、フタル酸、2,6−ナフタレンジ
カルボン酸、テレフタル酸、アジピン酸、セバシン酸、
及びオキシカルボン酸成分、例えばP−オキシエトキシ
安息香酸等の一種または二種以上を用いることが可能で
ある。グリコール成分としては、エチレングリコール、
プロピレングリコール、ブタンジオール、1.4−シク
ロヘキサンジメタツール、ネオペンチルグリコール等の
一種又は二種以上を用いることができる。いずれにして
も本発明のポリエステルは繰り返し構造単位の80%以
上がエチレンテレフタレート単位を有するポリエステル
であることが好ましい。The term "polyester" used in the present invention refers to a polyester obtained using terephthalic acid or its ester and ethylene glycol as main starting materials, but it may contain other third components. In this case, as the dicarboxylic acid component,
For example, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, terephthalic acid, adipic acid, sebacic acid,
and oxycarboxylic acid components, such as P-oxyethoxybenzoic acid, or one or more of them can be used. Glycol components include ethylene glycol,
One or more of propylene glycol, butanediol, 1,4-cyclohexane dimetatool, neopentyl glycol, etc. can be used. In any case, the polyester of the present invention is preferably a polyester in which 80% or more of the repeating structural units have ethylene terephthalate units.
また、該ポリエステルに任意の添加剤、例えば、熱安定
側、ブロッキング防止剤、酸化防止剤、着色剤、帯電防
止剤、紫外線吸収剤などを含有させてもよい。Further, the polyester may contain arbitrary additives such as heat stabilizers, antiblocking agents, antioxidants, colorants, antistatic agents, ultraviolet absorbers, and the like.
本発明の特徴の一つはある特定のバテライト型炭酸カル
シウム粒子を用いる点にある。炭酸カルシウム粒子の製
法としては天然の炭酸カルシウムを粉砕、分級する方法
の他、例えば特開昭5969425号公報に示されてい
るように水酸化カルシウムの液に二酸化炭素含有ガスを
反応せしめるいわゆる合成法による沈降性炭酸カルシウ
ムが知られている。この場合比較的粒径の揃ったカルサ
イト型炭酸カルシウム粒子が得られ、これを例えば特公
平1−16856号公報に示されているようにポリエス
テルフィルムに配合することも知られているが、該粒子
はなお所望の粒度分布には達し得ない。One of the features of the present invention is the use of specific vaterite-type calcium carbonate particles. Calcium carbonate particles can be produced by a method of pulverizing and classifying natural calcium carbonate, as well as a so-called synthesis method in which a calcium hydroxide solution is reacted with a carbon dioxide-containing gas, as shown in JP-A No. 5,969,425. Precipitated calcium carbonate is known. In this case, calcite-type calcium carbonate particles with a relatively uniform particle size are obtained, and it is known that these particles can be blended into a polyester film as shown in Japanese Patent Publication No. 1-16856, for example. The particles still cannot reach the desired particle size distribution.
本発明者らはかかる合成法において系の水素イオン濃度
や反応速度を始めとする製造条件を選定することにより
粒度分布の極めて鋭いバテライト型の炭酸カルシウムを
製造し得ることを知見した。The present inventors have discovered that in such a synthesis method, vaterite-type calcium carbonate with an extremely sharp particle size distribution can be produced by selecting production conditions including the hydrogen ion concentration and reaction rate of the system.
この代表的な例として、丸尾カルシウム■製VAN銘柄
を挙げることができる。該バテライト型炭酸カルシウム
はそのままポリエステル製造工程に添加することもでき
るが、反応系への溶解度を減少させまた分散性を向上さ
せるため表面処理を施しておくことが好ましい。この分
散剤を兼ねる表面処理剤としては例えば特開昭59−6
9426号公報あるいは特開平1256558号公報に
記載しであるような表面処理剤、特に高分子ポリカルボ
ン酸あるいはそれらのナトリウム塩、アンモニウム塩等
が好ましく用いられる。これらは通常核粒子の製造段階
の途中で加えると効果的である。A typical example of this is VAN brand manufactured by Maruo Calcium. Although the vaterite-type calcium carbonate can be added to the polyester production process as it is, it is preferably subjected to surface treatment in order to reduce its solubility in the reaction system and improve its dispersibility. As a surface treatment agent that also serves as a dispersant, for example, JP-A No. 59-6
Surface treating agents such as those described in JP-A-9426 or JP-A-1256558 are preferably used, particularly high-molecular polycarboxylic acids, their sodium salts, ammonium salts, and the like. It is usually effective to add these during the production step of the core particles.
かかるバテライト型炭酸カルシウムは球状あるいは楕円
球状として得られその長径と短径との比は通常1.8程
度以下である。本発明においてはその粒度分布値は1.
60以下、好ましくは1.50以下、更に好ましくは1
.40以下でなければならない。この値が1.60を越
えると最終的に得られるフィルムの表面粗度が不均一と
なり電磁気特性を損ねてしまう。Such vaterite-type calcium carbonate is obtained in the form of a sphere or an ellipsoid, and the ratio of the major axis to the minor axis is usually about 1.8 or less. In the present invention, the particle size distribution value is 1.
60 or less, preferably 1.50 or less, more preferably 1
.. Must be 40 or less. If this value exceeds 1.60, the surface roughness of the final film will be non-uniform and the electromagnetic properties will be impaired.
また本発明で用いる該粒子の平均粒径は0.07〜1.
5μm、好ましくは0.15〜1.0μmでなければな
らない。この値が0.07μm未満では走行性や耐摩耗
性がほとんど改良されないし、一方1゜5μmを越える
ようになると粗度は均一ではあるものの絶対値が大きく
なり過ぎ電磁気特性が悪化する。Further, the average particle size of the particles used in the present invention is 0.07 to 1.
It should be 5 μm, preferably 0.15-1.0 μm. If this value is less than 0.07 μm, there is little improvement in runnability or wear resistance, while if it exceeds 1°5 μm, although the roughness is uniform, the absolute value becomes too large and the electromagnetic properties deteriorate.
またそのフィルムへの配合量は0.005〜2.0重量
%、好ましくは0.01〜0.8重量%の範囲から選択
される。配合量が0.005重量%未満では走行性や耐
摩耗性が向上しないし、逆に2.0重量%を越えると電
磁気特性が低化してしまう。Further, the amount added to the film is selected from the range of 0.005 to 2.0% by weight, preferably 0.01 to 0.8% by weight. If the amount is less than 0.005% by weight, running properties and wear resistance will not improve, and if it exceeds 2.0% by weight, the electromagnetic properties will deteriorate.
このように本発明においてはある特定の炭酸カルシウム
粒子を用いることにより磁気記録媒体用ベースフィルム
として必要な緒特性を改良するが、その効果はフィルム
の縦方向ヤング率と横方向ヤング率の和が900kg/
IIIIllz以上、特に1000kg/mm”以上、
就中1100 kg/ 111m”以上、縦方向ヤング
率と横方向ヤング率の差が100kg/m111!以上
、特に150 kg/mm2、就中200 kg/mm
2以上である高強度で異方性のフィルムの時効果的に発
揮される。このようなフィルムは公知の製膜方法を採用
することにより得ることができる。In this way, in the present invention, the mechanical properties necessary for a base film for magnetic recording media are improved by using a certain specific calcium carbonate particle, but the effect is determined by the sum of the Young's modulus in the longitudinal direction and the Young's modulus in the transverse direction. 900kg/
IIIllz or more, especially 1000kg/mm” or more,
Especially 1100 kg/111 m" or more, the difference between the longitudinal Young's modulus and the transverse Young's modulus is 100 kg/m111! or more, especially 150 kg/mm2, especially 200 kg/mm
It is effectively exhibited when the film has high strength and anisotropy of 2 or more. Such a film can be obtained by employing a known film forming method.
例えば縮方向により強く配向したフィルムを得るには次
のような方法を採る。For example, the following method can be used to obtain a film that is more strongly oriented in the shrinkage direction.
例えば、270°C〜300°Cでポリエステルチップ
をフィルム状に溶融押出し後、40″C〜7゜°Cで冷
却後固化し、無定形シートとした後、80〜120°C
で縮方向に3.0倍〜6.0倍、次いで90〜150°
Cで横方向により低倍率で延伸し、170〜240°C
にて熱処理する方法がある。もちろん紺横に逐次二軸延
伸あるいは同時二軸延伸した後さらに110°C〜18
0°Cの温度で縦方向に1.05〜2.0倍再延伸を行
なった後熱処理する方法も取り得る。この際、再縦延伸
前熱固定、再紺延伸後縦弛緩、再縦延伸前又は後微小倍
率縦延伸等の手法を適宜採用することができる。For example, after melt-extruding polyester chips into a film at 270°C to 300°C, cooling and solidifying at 40"C to 7°C, forming an amorphous sheet, and then extruding it at 80 to 120°C.
3.0 to 6.0 times in the contraction direction, then 90 to 150°
Stretch at a lower magnification in the transverse direction at 170-240°C
There is a method of heat treatment. Of course, after sequential biaxial stretching or simultaneous biaxial stretching on the navy blue side, further 110 ° C ~ 18
A method may also be used in which the film is re-stretched by 1.05 to 2.0 times in the machine direction at a temperature of 0°C and then heat treated. At this time, techniques such as heat setting before longitudinal re-stretching, longitudinal relaxation after re-longitudinal stretching, and micro-magnification longitudinal stretching before or after re-longitudinal stretching can be appropriately employed.
また横方向により強く配向したフィルムを得るためには
、例えば無定形シートを80〜120″Cで縦方向に3
.0〜4.0倍、次いで90〜150°Cで横方向に4
.0〜6.0倍縦方向よりも高倍率で延伸し熱処理する
方法を採用することができる。この場合横方向に再延伸
するという手法を採ってもよい。In addition, in order to obtain a film that is more strongly oriented in the transverse direction, for example, an amorphous sheet is
.. 0 to 4.0 times, then 4 times laterally at 90 to 150°C.
.. A method of stretching at a magnification higher than that in the machine direction by 0 to 6.0 times and heat treatment can be adopted. In this case, a method of re-stretching in the lateral direction may be adopted.
なお、本発明のフィルムの平均屈折率(n)は1.59
8〜1.605の範囲とすることが好ましい。The average refractive index (n) of the film of the present invention is 1.59.
It is preferable to set it as the range of 8-1.605.
n−が1.598未満の場合はフィルムに多少熱が加わ
った場合に寸法安定性が悪化し、スキュー特性の低下を
招く。一方、Tが1.605を超えるとフィルム表面が
もろ(なり、白粉の発生が著しい。When n- is less than 1.598, the dimensional stability deteriorates when some heat is applied to the film, leading to a decrease in skew characteristics. On the other hand, when T exceeds 1.605, the film surface becomes brittle and white powder is significantly generated.
Tの値は、好ましくは1.600〜1.603の範囲で
ある。The value of T is preferably in the range of 1.600 to 1.603.
また本発明のフィルムの厚みは通常15μm以下である
が、特に12μ以下の時効果が顕著である。Further, the thickness of the film of the present invention is usually 15 μm or less, and the effect is particularly remarkable when the thickness is 12 μm or less.
このように本発明の方法により、走行性及び耐摩耗性が
特に要求される高強度で異方性のフィルムにおいて、あ
る特定のバテライト型炭酸カルシウム粒子を用いること
により初めて所望の効果を得ることができるが、本発明
の趣旨を損なわない範囲で更にフィルム特性を改良する
目的等のために他の粒子を1種以上併用しても良い。As described above, the method of the present invention makes it possible to obtain the desired effect for the first time by using specific vaterite-type calcium carbonate particles in high-strength, anisotropic films that require particularly good runnability and abrasion resistance. However, one or more other particles may be used in combination for the purpose of further improving the film properties without departing from the spirit of the present invention.
かかる粒子の一つとして析出粒子を挙げることができる
。ここでいう析出粒子とは、例えばエステル交換触媒と
してアルカリ金属またはアルカリ土類金属化合物を用い
た系を常法により重合することにより反応系内に析出す
るものを指す。また、エステル交換反応あるいは重縮合
反応時にテレフタル酸を添加することにより析出させて
もよい。Precipitated particles can be mentioned as one of such particles. The term "precipitated particles" as used herein refers to particles that are precipitated in a reaction system when, for example, a system using an alkali metal or alkaline earth metal compound as a transesterification catalyst is polymerized by a conventional method. Alternatively, precipitation may be carried out by adding terephthalic acid during transesterification or polycondensation reaction.
これらの場合、リン酸、リン酸トリメチル、リン酸トリ
エチル、リン酸トリブチル、酸性リン酸エチル、亜リン
酸、亜リン酸トリメチル、亜リン酸トリエチル、亜リン
酸トリブチル等のリン化合物の一種以上を存在させてお
いてもよい。In these cases, one or more phosphorus compounds such as phosphoric acid, trimethyl phosphate, triethyl phosphate, tributyl phosphate, acidic ethyl phosphate, phosphorous acid, trimethyl phosphite, triethyl phosphite, and tributyl phosphite are used. It may be left to exist.
また、エステル化工程を経る場合にもこれらの方法で不
活性物質粒子を析出させることができる。Furthermore, even when an esterification step is performed, inert material particles can be precipitated by these methods.
例えば、エステル化反応終了前または後にアルカリ金属
またはアルカリ土類金属化合物を存在させ、リン化合物
の存在下あるいは非存在下に重合反応を行なわせる。For example, an alkali metal or alkaline earth metal compound is made to exist before or after the completion of the esterification reaction, and the polymerization reaction is carried out in the presence or absence of a phosphorus compound.
いずれにしても本発明でいうポリエステル生成反応中に
生成する微細な析出化合物にはカルシウム、リチウム、
アンチモン、リン等の元素が一種以上含まれている。In any case, the fine precipitated compounds generated during the polyester production reaction in the present invention include calcium, lithium,
Contains one or more elements such as antimony and phosphorus.
また別の例として、いわゆる添加粒子を挙げることがで
きる。この添加粒子とはポリエステル製造工程に外部か
ら添加する粒子を指すが、具体的にはカオリン、タルク
、カーボン、硫化モリブデン、石膏、岩塩、酸化アルミ
ニウム、硫酸バリウム、フン化リチウム、フッ化カルシ
ウム、ゼオライト、リン酸カルシウム、二酸化ケイ素、
二酸化チタン等を挙げることができる。Another example is so-called additive particles. These additive particles refer to particles added externally to the polyester manufacturing process, and specifically include kaolin, talc, carbon, molybdenum sulfide, gypsum, rock salt, aluminum oxide, barium sulfate, lithium fluoride, calcium fluoride, and zeolite. , calcium phosphate, silicon dioxide,
Examples include titanium dioxide.
なお、かかる添加粒子の例として耐熱性の冑分子微粉体
を挙げることもできる。この場合の典型的な例としては
、例えば特公昭59−5216号公報に記載されている
ような、分子中に唯一個の脂肪族の不飽和結合を有する
モノビニル化合物と架橋剤として分子中に二個以上の脂
肪族の不飽和結合を有する化合物との共重合体を例示す
ることができるが、勿論これらに限定される訳ではなく
、例えば熱硬化性フェノール樹脂、熱硬化性エポキシ樹
脂、熱硬化性尿素樹脂、ベンゾグアナミン樹脂あるいは
ポリテトラフルオロエチレンのようなフッ素系樹脂の微
粉体を用いることもできる。Incidentally, heat-resistant helmet molecule fine powder can also be mentioned as an example of such additive particles. A typical example of this case is a monovinyl compound having only one aliphatic unsaturated bond in the molecule and a crosslinking agent as described in Japanese Patent Publication No. 59-5216. Examples include copolymers with compounds having at least 3 aliphatic unsaturated bonds, but are not limited to these, for example, thermosetting phenolic resins, thermosetting epoxy resins, thermosetting It is also possible to use fine powder of a fluororesin such as a polyurea resin, benzoguanamine resin, or polytetrafluoroethylene.
なお、当然の事ながら本発明のバテライト型炭酸カルシ
ウム粒子と組合せることが可能な粒子として、天然の炭
酸カルシウムや合成法によるカルサイト型炭酸カルシウ
ムを挙げることができる。Naturally, examples of particles that can be combined with the vaterite-type calcium carbonate particles of the present invention include natural calcium carbonate and calcite-type calcium carbonate produced by synthetic methods.
なお、本発明においては併用する粒子はその平均粒径が
本発明のバテラテト型炭酸カルシウムのそれより大きい
場合は該炭酸カルシウムと同重量以下、好ましくは0.
005〜0.5倍重量、より好ましくは0.01〜0.
3倍重量の範囲から選択すると良い。また逆に併用する
粒子の粒径の方が小さい場合は該炭酸カルシウムと同重
量以上、例えば1〜20倍重量とすることもできる。In addition, in the present invention, when the average particle diameter of the particles used in combination is larger than that of the vaterate-type calcium carbonate of the present invention, the weight is equal to or less than that of the calcium carbonate, preferably 0.
005 to 0.5 times the weight, more preferably 0.01 to 0.00.
It is best to choose from the range of 3 times the weight. On the other hand, when the particle size of the particles used in combination is smaller, the weight can be equal to or more than the weight of the calcium carbonate, for example, 1 to 20 times the weight.
なお本発明においては平均粒径の異なるかかるバテライ
ト型粒子を2種以上用いても良い。In the present invention, two or more types of such vaterite particles having different average particle sizes may be used.
ところで近年磁気記録用ベースフィルムには平現性、易
滑性、耐摩耗性更には接着性に加え新たに耐擦傷性がし
ばしば要求されるようになった。Incidentally, in recent years, magnetic recording base films are often required to have flatness, slipperiness, abrasion resistance, and scratch resistance in addition to adhesion.
これは例えばテープが高速で走行する際、テープが接触
する部分から傷つけられたり、発生した摩耗粉によりフ
ィルムに傷が入り易くなったりするためである。傷付き
が多いと外観上好ましくないということもさることなが
ら、工程の汚染やドロップアウトの増加を引き起こすよ
うになる。This is because, for example, when the tape runs at high speed, the tape may be damaged from the contact portion, or the film may be easily damaged by generated abrasion powder. If there are many scratches, not only will the appearance be unfavorable, but it will also cause contamination in the process and an increase in dropouts.
この耐擦傷性を高度に改良するためには併用する粒子と
して、特に酸化アルミニウムを選択することが好ましい
。就中、平均粒径0.5μm以下、好ましくは0.1μ
m以下のデルタ型もしくはガンマ型の酸化アルミニウム
粒子、特にデルタ型のそれが好ましく用いられる。これ
らの粒子の製造法としては例えば熱分解法、即ち無水塩
化アルミニウムを原料として火焔加水分解させる方法、
あるいはアンモニウム明ばん熱分解法即ち水酸化アルミ
ニウムを出発原料とし硫酸と反応させて硫酸アルミとし
たのち硫酸アンモニウムと反応させアンモニウム明ぽん
として焼成する方法等を挙げることができる。In order to highly improve this scratch resistance, it is particularly preferable to select aluminum oxide as the particles used in combination. In particular, the average particle size is 0.5 μm or less, preferably 0.1 μm.
Delta-type or gamma-type aluminum oxide particles of m or less in size, particularly delta-type aluminum oxide particles, are preferably used. Examples of methods for producing these particles include pyrolysis, that is, flame hydrolysis using anhydrous aluminum chloride as a raw material;
Alternatively, there may be mentioned an ammonium alum thermal decomposition method, that is, a method in which aluminum hydroxide is used as a starting material, reacted with sulfuric acid to produce aluminum sulfate, and then reacted with ammonium sulfate to produce ammonium alum.
これらの方法により得られる酸化アルミニウムの一次粒
径は通常5〜40nmの範囲にあるが、しばしば0.5
μmを越える凝集体を形成しているので、適度に解砕し
て使用することが望ましい。この場合多少凝集した二次
粒子となっていても良いが、見かけ上の平均粒径は0.
5μm以下、好ましくは0.1μm以下とするのが良い
。The primary particle size of aluminum oxide obtained by these methods is usually in the range 5-40 nm, but often 0.5 nm.
Since it forms aggregates exceeding μm in size, it is desirable to crush them appropriately before use. In this case, the secondary particles may be agglomerated to some extent, but the apparent average particle size is 0.
The thickness is preferably 5 μm or less, preferably 0.1 μm or less.
このように本発明においてはバテライト型炭酸カルシウ
ムと必要に応じ微細な酸化アルミニウム粒子を始めとす
る他の粒子を用いることにより極めて優れた磁気記録用
ポリエステルフィルムを得ることを可能ならしめた。As described above, in the present invention, by using vaterite type calcium carbonate and, if necessary, other particles including fine aluminum oxide particles, it has become possible to obtain an extremely excellent polyester film for magnetic recording.
ところで本発明のバテライト型炭酸カルシウム粒子を含
むポリエステルの製造に際しては該粒子は、ポリエステ
ルの合成反応中に添加するのが好ましい。特に、エステ
ル交換反応又はエステル化反応終了後、重縮合反応開始
前に添加するのが好適である。By the way, when producing a polyester containing vaterite-type calcium carbonate particles of the present invention, the particles are preferably added during the polyester synthesis reaction. In particular, it is suitable to add it after the end of the transesterification reaction or the esterification reaction and before the start of the polycondensation reaction.
なお、該粒子は、通常、エチレングリコール等の溶媒中
に粒子濃度3〜50重量%のスラリーとして添加する。The particles are usually added as a slurry with a particle concentration of 3 to 50% by weight in a solvent such as ethylene glycol.
スラリーの粒子濃度が3重量%未満では、エチレングリ
コールの使用量が増し、エチレングリコールの原単位が
大きくなり好ましくない。また、粒子濃度が50重量%
を超えたスラリーを添加すると、粒子の分散性が往々に
して悪化する。If the particle concentration of the slurry is less than 3% by weight, the amount of ethylene glycol used increases and the basic unit of ethylene glycol becomes large, which is not preferable. In addition, the particle concentration is 50% by weight.
If more slurry is added, the dispersibility of the particles often deteriorates.
なお、ポリエステル合成の重縮合反応触媒としては、S
b、Ge、Ti、Sn、Si化合物等の通常用いられて
いる触媒が使用される。In addition, as a polycondensation reaction catalyst for polyester synthesis, S
Commonly used catalysts such as b, Ge, Ti, Sn, and Si compounds are used.
磁気記録媒体用として好適な本発明のフィルムは特定の
粒子と特定のフィルム物性との組合せにより初めて得ら
れるものであるが、そのフィルム表面粗度は中心線平均
粗さで通常0.0 O5〜0.1gm、好ましくは0.
007〜0.08 urt+ 、より好ましくは0.0
1〜0.03μIの範囲から選択される。The film of the present invention, which is suitable for use in magnetic recording media, can only be obtained by a combination of specific particles and specific film physical properties, and the surface roughness of the film is usually 0.0 O5 to 0.05 in terms of centerline average roughness. 0.1 gm, preferably 0.1 gm.
007-0.08 urt+, more preferably 0.0
It is selected from the range of 1 to 0.03 μI.
本発明のフィルムはビデオテープ用のベースフィルムと
して賞用される他、オーディオ用のそれとして用いた場
合にも特に効果を発揮し得る。The film of the present invention is useful as a base film for videotapes, and can also be particularly effective when used as an audio film.
〔実施例]
以下本発明を実施例により更に詳細に説明するが、本発
明はその要旨を超えない限り以下の実施例に限定される
ものではない。[Examples] The present invention will be explained in more detail by Examples below, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.
尚、本発明の諸物性の測定は以下の方法によって行なっ
た。The various physical properties of the present invention were measured by the following methods.
実施例中、「部」及び「%」とあるのは各々「重量部」
及び「重量%」を意味する。In the examples, "parts" and "%" each refer to "parts by weight".
and "% by weight".
(1)平均粒径及び粒度分布値
粒径は電子顕微鏡による写真法で測定し等偏球に換算し
た。粒度分布は約1000個の粒子の粒径を測定し、大
粒子側かり体積を積算した。総体積に対し、25%時の
粒径をaZSとし、75%時の粒径をd7sとしてその
比Cd z5/ d 75 )の値で粒度分布のシャー
プさを示した。この値が1に近いほどシャープである。(1) Average particle size and particle size distribution value The particle size was measured by a photographic method using an electron microscope and converted into an equioblate sphere. The particle size distribution was determined by measuring the particle diameters of about 1000 particles and adding up the volume of the large particles. The sharpness of the particle size distribution was indicated by the value of the ratio Cd z5/d 75 ), where the particle size at 25% of the total volume was taken as aZS and the particle size at 75% was taken as d7s. The closer this value is to 1, the sharper the image.
なお平均粒径はd5゜(μl11)で表わされる。Note that the average particle diameter is expressed as d5° (μl11).
(2) ヤング率
■インテスコ製引張試験機インテスコモデル2001型
を用いて、温度23°C,湿度50%RHに調節された
室内において、長さ3001、幅201の試料フィルム
を、10%/min のひずみ速度で引張り、引張応
力−ひすみ曲線の初めの直線部分を用いて次の式によっ
て計算する。(2) Young's Modulus ■ Using a tensile tester Intesco model 2001 manufactured by Intesco, a sample film with a length of 3001 and a width of 201 was tested at 10%/ Tensile at a strain rate of min, calculated by the following equation using the first straight part of the tensile stress-strain curve.
E=Δσ/Δε
ここで、E=引張弾性率(kg/mm”ンΔσ−直線上
の2点の元の平均断面積による応力差
Δε−同じ2点間のひずみ差
(3) フィルムの滑り性
第1図の装置により、固定した硬質クロムメツキ金属ロ
ール(直径6n+m)にフィルムを巻き付は角135°
(θ)で接触させ、53g(T2)の荷重を一端にか
けて、1m/分の速度でこれを走行させ、他端の抵抗力
(T+(g))を測定し、次式により走行中の摩擦係数
(μd)を求めた。E = Δσ / Δε Where, E = Tensile modulus (kg/mm) Δσ - Stress difference due to the original average cross-sectional area of two points on the straight line Δε - Strain difference between the same two points (3) Film slippage Using the device shown in Figure 1, the film is wound around a fixed hard chrome-plated metal roll (diameter 6n+m) at an angle of 135°.
(θ), apply a load of 53 g (T2) to one end, run it at a speed of 1 m/min, measure the resistance force (T + (g)) at the other end, and calculate the friction during running using the following formula. The coefficient (μd) was determined.
(4)フィルムの表面粗度
中心線平均粗さ(Ra);
■小板研究所社製表面粗さ測定機(SE−3F)を用い
て次のようにして求めた。即ち、フィルム断面曲線から
その中心線の方向に基準長さL(2゜5n+m)の部分
を抜き取り、この抜き取り部分の中心線をy軸、縦倍率
の方向をy軸として粗さ曲線y=f (x)で表わした
とき、次の式で与えられた値を〔μm〕で表わす。中心
線平均粗さは、試料フィルム表面から10本の断面曲線
を求め、これらの断面曲線から求めた抜き取り部分の中
心線平均粗さの平均値で表わした。尚、触針の先端半径
は2μm、荷重は30mgとし、カットオフ値は0.0
8mmとした。(4) Surface roughness of film Center line average roughness (Ra); (2) Determined as follows using a surface roughness measuring machine (SE-3F) manufactured by Koita Research Institute. That is, a part with a reference length L (2°5n+m) is extracted from the film cross-sectional curve in the direction of its center line, and the roughness curve y=f is created with the center line of this extracted part as the y-axis and the vertical magnification direction as the y-axis. When expressed as (x), the value given by the following formula is expressed in [μm]. The centerline average roughness was determined by determining 10 cross-sectional curves from the surface of the sample film, and was expressed as the average value of the centerline average roughness of the sampled portions determined from these cross-sectional curves. The tip radius of the stylus is 2 μm, the load is 30 mg, and the cutoff value is 0.0.
It was set to 8 mm.
最大高さ(Rt);
■小板研究所社製表面粗さ測定機(SE−3F)によっ
て得られた断面曲線から、基準長さ(2,511111
1)だけ抜きとった部分(以下、抜き取り部分という。Maximum Height (Rt)
The part where only 1) is removed (hereinafter referred to as the removed part).
)の平均線に平行な2直線で抜き取り部分を挟んだ時、
この2直線の感覚を断面曲線の縦倍率の方向に測定して
その値をマイクロメートル(μm)単位で表わしたもの
を抜き取り部分の最大高さとした。最大高さは、試料フ
ィルム表面から10本の断面曲線を求め、これらの断面
曲線から求めた抜き取り部分の最大高さの平均値で表わ
した。尚、この時使用した触針の半径は、2.0μm、
荷重30mgでカットオフ値は、0.08mmである。) when the sampled part is sandwiched between two straight lines parallel to the average line of
The sense of these two straight lines was measured in the direction of the longitudinal magnification of the cross-sectional curve, and the value expressed in micrometers (μm) was taken as the maximum height of the extracted portion. The maximum height was determined by determining 10 cross-sectional curves from the surface of the sample film, and was expressed as the average value of the maximum height of the sampled portion determined from these cross-sectional curves. The radius of the stylus used at this time was 2.0 μm.
The cutoff value is 0.08 mm at a load of 30 mg.
なおRt / Raが小さいほどそのフィルムの表面粗
度は均一である。Note that the smaller Rt/Ra is, the more uniform the surface roughness of the film is.
(5)耐摩耗型の評価
第2図に示すテープ摩耗評価機を用い、幅1011…の
ポリエステルフィルムを200m長さにわたって走行さ
せ図中(1)で示した固定ピン(直径6nun、材質5
US420−J2、仕上げ0.23 )に付着した摩耗
粉の量を目視評価し4ランクに分けた。なお、フィルム
の走行速度は11.4m/分とし張力を(V)で示した
テンションピックアップで検出し、初期張力を300g
、フィルムとの巻き付は角θを135°とした。(5) Evaluation of abrasion resistance type Using the tape abrasion evaluation machine shown in Figure 2, a polyester film with a width of 1011...
The amount of abrasion powder adhering to US420-J2 (finish 0.23) was visually evaluated and divided into four ranks. The running speed of the film was 11.4 m/min, the tension was detected by a tension pickup indicated by (V), and the initial tension was 300 g.
The angle θ of the winding with the film was set to 135°.
ランクA:付着が全く認められない。Rank A: No adhesion observed.
ランクB:付着が極く僅か認められるが実用上は問題な
い。Rank B: Very slight adhesion is observed, but there is no problem in practical use.
ランクC:付着量がやや多く長時間使用すると問題とな
りうる。Rank C: The amount of adhesion is slightly large and may cause problems if used for a long time.
ランクC:付着量が多く実用上使用し難い。Rank C: The amount of adhesion is large and it is difficult to use it practically.
(6)磁気テープ特性
まず、次に示す磁性塗料をポリエステルフィルムに塗布
し、乾燥後の膜厚が2部mとなるように磁性層を形成し
た。即ち磁性微粉末200部、ポリウレタン樹脂30部
、ニトロセルロース10部、塩酢ビ共重合体10部、レ
シチン5部、シクロヘキサノン100部、メチルイソブ
チルケトンl。(6) Magnetic tape characteristics First, the following magnetic paint was applied to a polyester film to form a magnetic layer so that the film thickness after drying was 2 parts m. Namely, 200 parts of magnetic fine powder, 30 parts of polyurethane resin, 10 parts of nitrocellulose, 10 parts of salt-vinyl acetate copolymer, 5 parts of lecithin, 100 parts of cyclohexanone, and 1 liter of methyl isobutyl ketone.
0部及びメチルエチルケトン300部をボールミルにて
48時間混合分散後ポリイソシアネート化合物5部を加
えて磁性塗料とし、これをポリエステルフィルムに塗布
した後、塗料が充分乾燥固化する前に磁気配向させ、そ
の後乾燥した。更に、この塗布フィルムをスーパーカレ
ンダーにて表面処理し、1部2インチ幅にスリットして
ビデオテープとした。このビデオテープを松下電器■製
NV−3700型ビデオデツキにより、常連にて下記の
磁気テープ特性を評価した。After mixing and dispersing 0 parts and 300 parts of methyl ethyl ketone in a ball mill for 48 hours, 5 parts of a polyisocyanate compound was added to make a magnetic paint, and this was applied to a polyester film. Before the paint was sufficiently dried and solidified, it was magnetically oriented, and then dried. did. Furthermore, this coated film was surface-treated using a supercalender, and each portion was slit into a 2-inch width to form a videotape. The following magnetic tape characteristics of this videotape were evaluated using an NV-3700 video deck manufactured by Matsushita Electric.
VTRヘッド出力;
シンクロスコープにより測定周波数4メガヘルツに於け
るVTRヘッド出力を測定し基準サンプルに対する相対
値をデシベル(dB)で表示した。VTR head output: The VTR head output at a measurement frequency of 4 MHz was measured using a synchroscope, and the relative value to the reference sample was expressed in decibels (dB).
ドロップアウト数;
4.4メガヘルツの信号を記録したビデオテープを再生
し、大量インダストリー■製ドロップアウトカウンター
にて15μ5ec−20dBにおけるドロップアウト数
を約20分間測定し、1分間当りのドロップアウト数(
個/分)に換算した。Number of dropouts; Play back a videotape recording a 4.4 MHz signal, measure the number of dropouts at 15μ5ec-20dB for about 20 minutes using a dropout counter manufactured by Mass Industry ■, and calculate the number of dropouts per minute (
pcs/min).
(7)耐擦り偏性
幅1部2インチにスリットした磁気テープを硬質クロム
メツキ金属ピン(直径mm、仕上げ3S)に張力50g
、巻き付は角135°、走行速度3m/秒で磁気テープ
のベースフィルム面を1回擦過させる。(7) Abrasion resistance One part of the magnetic tape slit to a width of 2 inches is attached to a hard chrome-plated metal pin (diameter mm, finish 3S) under a tension of 50 g.
The base film surface of the magnetic tape is rubbed once at a winding angle of 135° and a running speed of 3 m/sec.
次に擦過面にアルミニウムを約1000人真空蒸着し、
傷の量を目視判定し以下の5ランクに分けた。Next, about 1000 people vacuum-deposited aluminum on the scratched surface.
The amount of damage was visually judged and divided into the following five ranks.
ランク1:傷の量が極めて多い。Rank 1: The amount of damage is extremely large.
ランク2:傷の量が多い。Rank 2: The amount of damage is large.
ランク3:傷の量が2.4の中間。Rank 3: The amount of damage is in the middle of 2.4.
ランク4:傷の量が少ない。Rank 4: The amount of damage is small.
ランク5:傷が付かない。Rank 5: No damage.
実施例1
ジメチルテレフタレート100部とエチレングリコール
60部及び酢酸マグネシウム・四水塩0゜09部を反応
器にとり、加熱昇温すると共にメタノールを留出し、エ
ステル交換反応を行ない、反応開始から4時間を要して
230°Cに昇温し、実質的にエステル交換反応を終了
した。Example 1 100 parts of dimethyl terephthalate, 60 parts of ethylene glycol, and 0.09 parts of magnesium acetate tetrahydrate were placed in a reactor, the temperature was raised, methanol was distilled off, and a transesterification reaction was carried out for 4 hours from the start of the reaction. The temperature was raised to 230°C, and the transesterification reaction was substantially completed.
次いで平均粒径0.25μl、粒度分布値1.29の高
分子ポリカルボン酸で表面処理を施したバテライト型炭
酸カルシウム(丸尾カルシウム■製VAN−030)0
.5部をエチレングリコールスラリーとして添加し、更
にエチレンアシンドフォスフェート0.04部、二酸化
アンチモン0.04部を加えて、4時間重縮合反応を行
ない1、ポリエチレンテレフタレートを得た。Next, vaterite-type calcium carbonate (VAN-030 manufactured by Maruo Calcium ■) 0 which was surface-treated with a high molecular weight polycarboxylic acid having an average particle size of 0.25 μl and a particle size distribution value of 1.29.
.. 5 parts of ethylene glycol slurry was added thereto, 0.04 part of ethylene acindophosphate and 0.04 part of antimony dioxide were added, and a polycondensation reaction was carried out for 4 hours to obtain 1, polyethylene terephthalate.
該ポリエステルの極限粘度は0.63であり、その内部
を顕微鏡で観察したところ粒子が均一に分散しているこ
とが確認された。The intrinsic viscosity of the polyester was 0.63, and when the inside thereof was observed under a microscope, it was confirmed that the particles were uniformly dispersed.
次に得られたポリエステルを乾燥した後290°Cで押
出機よりシート状に押し出しいわゆる静電印加冷却法を
用いて150μmの無定形シートを得た。次いでこの無
定形シートを縮方向に3.8倍、横方向に3.6倍延伸
し、更に縦方向に1.07倍再延伸し、縦方向に強化さ
れた厚み9.8μmの二軸延伸フィルムを得た。Next, the obtained polyester was dried and then extruded into a sheet from an extruder at 290°C using a so-called electrostatic cooling method to obtain an amorphous sheet of 150 μm. Next, this amorphous sheet was stretched 3.8 times in the shrinkage direction, 3.6 times in the transverse direction, and then re-stretched 1.07 times in the machine direction, resulting in biaxial stretching to a thickness of 9.8 μm with reinforcement in the machine direction. Got the film.
得られたフィルムの縦方向のヤング率は680kg/1
Ilff12、横方向のヤング率は430 kg/mm
2で両者の差は240 kg/va”であった。The longitudinal Young's modulus of the obtained film was 680 kg/1
Ilff12, Young's modulus in the lateral direction is 430 kg/mm
2, the difference between the two was 240 kg/va".
実施例2〜5及び比較例1〜3
表1に示すようにフィルム中に含有せしめる粒子を変え
る他は実施例1と同様にして2軸延伸フイルムを得、最
終的に磁気テープを製造した。Examples 2 to 5 and Comparative Examples 1 to 3 Biaxially stretched films were obtained in the same manner as in Example 1, except that the particles contained in the film were changed as shown in Table 1, and finally a magnetic tape was manufactured.
なお実施例2で用いたバテライト型炭酸カルシウムの粒
度分布値はいずれも1.40であり、実施例3.4.5
のそれは1.29である。これらはいずれも高分子ポリ
カルボン酸で表面処理が施されている。また比較例1で
用いたカルサイト型炭酸カルシウムは合成法により得ら
れたものでその粒度分布値は1.72である。また比較
例2のカオリン、実施例4の球状シリカの粒度分布値は
それぞれ2.65.1.44である。The particle size distribution values of vaterite-type calcium carbonate used in Example 2 were all 1.40, and Example 3.4.5.
It is 1.29. All of these are surface-treated with high-molecular polycarboxylic acid. Further, the calcite type calcium carbonate used in Comparative Example 1 was obtained by a synthetic method, and its particle size distribution value was 1.72. Furthermore, the particle size distribution values of kaolin in Comparative Example 2 and spherical silica in Example 4 are 2.65 and 1.44, respectively.
なお実施例3で用いた酸化アルミニウムは熱分解法によ
り得られたデルタ型の結晶型を有するものであり、また
実施例5の析出粒子はカルシウム元素、リチウム元素、
及びリン元素をそれぞれ1重量%以上含む粒子である。The aluminum oxide used in Example 3 had a delta crystal type obtained by a thermal decomposition method, and the precipitated particles in Example 5 contained calcium element, lithium element,
and phosphorus element in an amount of 1% by weight or more, respectively.
実施例6
実施例3で用いたポリエステル組成物を用い横方向に強
く配向した2軸延伸フイルムを製造した。Example 6 Using the polyester composition used in Example 3, a biaxially stretched film strongly oriented in the transverse direction was produced.
即ち実施例1と同様な操作により得た無定形シートを縦
方向に90°Cで3.5倍、次いで横方向に110°C
で4.3倍延伸し、更に横方向に1.08倍再延伸した
後熱処理を施した。That is, an amorphous sheet obtained by the same operation as in Example 1 was heated 3.5 times in the longitudinal direction at 90°C, and then at 110°C in the transverse direction.
The film was stretched by 4.3 times and then re-stretched by 1.08 times in the transverse direction, followed by heat treatment.
得られたフィルムの縦方向のヤング率は440kg/涌
1112、横方向のヤング率は670 kg/mm”で
両者の差は230 kg/mn+”であった。The obtained film had a Young's modulus in the longitudinal direction of 440 kg/1112 cm and a Young's modulus in the transverse direction of 670 kg/mm'', with a difference of 230 kg/mn+'' between the two.
以上、得られた結果をまとめて下記表1に示す。The results obtained above are summarized in Table 1 below.
本発明の要件を満たす実施例のフィルムは全て走行性、
耐摩耗性に優れ、とりわけ微細な酸化アルミニウムを併
用した実施例3.6のフィルムは特に耐擦傷性にも優れ
磁気記録媒体用のベースフィルムとして適していること
が解る。比較例1゜2は本発明の範囲外の粒子を用いた
場合の例であるが、フィルム表面が不均一で磁気テープ
特性が悪化する。All of the films of Examples that meet the requirements of the present invention have good runnability,
It can be seen that the film of Example 3.6, which has excellent abrasion resistance, particularly in which fine aluminum oxide is used in combination, also has particularly excellent scratch resistance and is suitable as a base film for magnetic recording media. Comparative Examples 1 and 2 are examples in which particles outside the range of the present invention were used, but the film surface was uneven and the magnetic tape characteristics deteriorated.
〔発明の効果]
本発明のフィルムは、特に走行性及び耐摩耗性が要求さ
れる高密度記録用の高強度フィルムにおいて特定の炭酸
カルシウム粒子を配合することによりこれらを高度に改
良せしめたものであり、その工業的価値は高い。[Effects of the Invention] The film of the present invention is a high-strength film for high-density recording that particularly requires running properties and abrasion resistance, and is highly improved by incorporating specific calcium carbonate particles. Yes, and its industrial value is high.
第1図はフィルムの走行性を評価する装置の走行系の概
略図である。図中(I)は6IIIIIlφ、5US−
420−J2固定ピン、(II)は入口テンションメー
ター (]II)は出口テンションメーターを示し、巻
き付は角(θ)は135°である。第2図は、フィルム
の耐摩耗性を評価する装置の走行系の概略図である。図
中、(IV)は6IIII!lφ、5US−420−J
2固定ビン、(V )はテンションメーターを示し、巻
き付は角(θ)は135゜である。FIG. 1 is a schematic diagram of a running system of an apparatus for evaluating film running properties. In the figure, (I) is 6IIIIIIlφ, 5US-
420-J2 fixed pin, (II) indicates the inlet tension meter, (]II) indicates the outlet tension meter, and the winding angle (θ) is 135°. FIG. 2 is a schematic diagram of a running system of an apparatus for evaluating the abrasion resistance of a film. In the figure, (IV) is 6III! lφ, 5US-420-J
2 fixed bins, (V) indicates the tension meter, and the winding angle (θ) is 135°.
Claims (1)
義する粒度分布値が1.60以下であるバテライト型炭
酸カルシウム粒子を0.005〜2.0重量%含有する
フィルムであり、且つ該フィルムの縦方向ヤング率と横
方向ヤング率の和が900kg/mm^2以上、縦方向
ヤング率と横方向ヤング率の差が100kg/mm^2
以上であることを特徴とする磁気記録媒体用ポリエステ
ルフィルム。 粒度分布値=d_2_5/d_7_5 (式中d_2_5、d_7_5は粒子群の積算体積を大
粒子側から計測し、それぞれ総体積の25%、75%に
相当する粒径(μm)を示す。)(1) A film containing 0.005 to 2.0% by weight of vaterite-type calcium carbonate particles having an average particle diameter of 0.07 to 1.5 μm and a particle size distribution value of 1.60 or less as defined by the following formula. Yes, and the sum of the Young's modulus in the longitudinal direction and the Young's modulus in the transverse direction of the film is 900 kg/mm^2 or more, and the difference between the Young's modulus in the longitudinal direction and the Young's modulus in the transverse direction is 100 kg/mm^2
A polyester film for magnetic recording media characterized by the above. Particle size distribution value = d_2_5/d_7_5 (In the formula, d_2_5 and d_7_5 indicate the particle diameter (μm) corresponding to 25% and 75% of the total volume, respectively, by measuring the integrated volume of the particle group from the large particle side.)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14893990A JPH0440624A (en) | 1990-06-07 | 1990-06-07 | Polyester film for magnetic recording medium |
EP91109194A EP0460640A1 (en) | 1990-06-07 | 1991-06-05 | Polyester film for magnetic recording media |
US07/710,438 US5164439A (en) | 1990-06-07 | 1991-06-05 | Polyester film for magnetic recording media |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14893990A JPH0440624A (en) | 1990-06-07 | 1990-06-07 | Polyester film for magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0440624A true JPH0440624A (en) | 1992-02-12 |
Family
ID=15464043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14893990A Pending JPH0440624A (en) | 1990-06-07 | 1990-06-07 | Polyester film for magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0440624A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6228918A (en) * | 1985-07-30 | 1987-02-06 | Teijin Ltd | Magnetic recording tape |
-
1990
- 1990-06-07 JP JP14893990A patent/JPH0440624A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6228918A (en) * | 1985-07-30 | 1987-02-06 | Teijin Ltd | Magnetic recording tape |
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