US2635970A - Translucent paper base - Google Patents

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US2635970A
US2635970A US62245A US6224548A US2635970A US 2635970 A US2635970 A US 2635970A US 62245 A US62245 A US 62245A US 6224548 A US6224548 A US 6224548A US 2635970 A US2635970 A US 2635970A
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paper
composition
coating
melt
viscosity
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US62245A
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Salo Martin
Harold F Vivian
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Eastman Kodak Co
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Eastman Kodak Co
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D21H17/27—Esters thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/11—Halides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06—Vegetable or imitation parchment; Glassine paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31982—Wood or paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31986—Regenerated or modified

Definitions

  • the impregnating composition should contain a resin which imparts adhesiveness to the composition but is yet stable insofar that the resin is compatible with the other ingredients of the composition and is not guilty of blocking when applied as a melt coat.
  • a resin which imparts adhesiveness to the composition but is yet stable insofar that the resin is compatible with the other ingredients of the composition and is not guilty of blocking when applied as a melt coat.
  • the cellulose ester employed must be a butyric acid ester of cellulose having a butyryl content of at least 42%.
  • the plasticizer employed in the impregnating" composition should be a solvent-type plasticizer, such as dioctyl phthalate, dicapryl phthalate, di
  • the paper is preheated to 30G-330 F. and an overcoating composition at a temperature of 340- 360 F. is applied thereto.
  • Any of the melt-coating compositions referred to in my patents listed above or in British Patent No. 540,765, are useful in this operation, particularly to obtain a coating characterized by good iiexibility.
  • the clearance on the rolls employed in the coating operation should be such as to give a coat of .0003 to .0005 inch thickness on each side of the paper sheet. This aggregates 3 pounds of coating per side or 6 .pounds of coating for both sides per 1000 square feet of paper surface.
  • the product which is obtained readily transmits a large proportion butyl sebacate, di-ethyl-hexyl adipate, methoxyethyl phthalate, ethoxyethyl phthalate, and the like.
  • plasticizers can be mixed to a small' extent with other types of plasticizers providing the resulting material remains of the solvent type o r, in other wo-rds, will dissolve the cellulose ester at a temperature of 170-l80 C.
  • the impregnating composition in addition to having a viscosity below 5000 centipoises at 170 C. must also be a material which exhibits a refractive index close to that of the paper which is treated.
  • the overcoatingcomposition which is applied as the second coat may be any melt-coating composition, such asv described in patents relating thereto.
  • This composition should vbe one which has a blocking p oint at about 200 F. and forms a coating which has satisfactory flexibility.
  • a composition of 75 parts of a cellulose acetate butyratefhaving a butyryl content of 45%, 15 parts of dibutyl sebacate, and 10 parts stearate is useful for this purpose.
  • Various melt-coating compositions which are eminently suitable for this overcoating have been described, such as in Salo Patents Nos. 2,387,773 and 2,387,774.
  • melt-coating compositions useful as the overcoating referred to Any of these compositions would be useful for the molten overcoating in preparingtranslucent paper base as. described herein.
  • Other melt-coating compositions which are useful for overcoating purposes inaccordance with out invention are described in British Patent 100,540.7 65, dated October 29, 1941.
  • the paper in 'accordance with our invention may be, readily prepared by preheating the paper sheet to a Atemperature of G-250 F. and then applyingf thereto in a ⁇ melt-coating operation, such as described in British Patent No. 540,765, a melt ofthe impregnating composition held at a temperature of 30D-330 F.
  • a useful composition in this connection is made up of 50-70% of a chlorinated diaryl, .particularly chlorinated diphenyl, having a chlorine content of at least 40%, 20-30% of a cellulose acetate butyrate having a low viscosity and a butyryl content of at least 45% and 5-15% of a solvent-type plasticizer.
  • Compositions of this nature vare described ad claimed in U. S. Patent No. 2,481,637. Any of the compositions therein 4which have a chlorinated diphenyl or Aoroclor lcontent of at least 50% and a melting point of less thanv 200 C. would be useful for this impregnating operation.
  • the paper is then given an overcoating by passing the paper through a melt-coating machine in which paper that subbing first be applied.
  • a melt-coating machine in which paper that subbing first be applied.
  • subbing which has been found to be useful in this connection is formed by first applying a very thinlayer of a cellulose nitrate of quitelow viscosity to thev melt coating, followed by a very thin layer of gelatin -applied thereto.
  • the technique of subbing in this manner is described in U. S. Patent No. 2,014,547 of Babcock, granted September 17, 1935. The disclosure of that patent may be referred to as a guide for this type of subbing operation.
  • the nitrate and gelatin may be mixed and applied as one layer.
  • a layer of a mixed cellulose ester such as hydrolyzed cellulose acetate propionate or butyrate.
  • any of the usual types of subbing layers which have been described in the prior art and which are compatible with the photographic emulsion layer to be employed and the melt-coating surface may be used if a subbing layer should be thought to be necessary.
  • the sensitized emulsion which is employed may be any of the usual gelatin silverhalide emulsions.
  • Eamplclr-Porous waterleaf paper was ime pregnated by means of hot calendering rolls. on a Waldron typemelt-coating machine after iirst heating the paper to 200--250v F. and coating it with a melt at 320 F., consisting of 35% Aof cellulose acetate butyrate having a 50% butyryl content and 25 cps. Viscosity, 60% of chlorinated diphenyl having a chlorine content of 65% vand 5% of dioctyl phthalate. After thusimpregnating the paper it was found to transmit a considerable amount of light or, in other words, exhibit a good degree of translucency.
  • the translucent impregnated paper was then overcoated on the melt-coating machine on both sides by heating the paper to 30G-330 F. and then applying at a temperature of 350 F. a melt consisting'4 of. 75 parts of cellulose acetate b-utyrate of 50% butyryl and 25 cps. viscosity, 15 parts of dibutyl sebacate, and l0 parts of butylstearate.
  • the coating rolls were set so as to give a thickness on each: side of approximately .0005 inch, the melt having been applied at the rate ofsix pounds per 1.000 square feet of surface.
  • the coated product which had a light transmission of about 60% was subbedby applying a thin layer of cellulose nitrate oflow viscosity and then a thin layer of gelatin thereto;
  • the paper was then coated with a photosensitiv gelatine-silver l,halide emulsion, land the result-q ing product was found to be satisfactory as a photographic copying and negatif e paper.
  • Example 2 the product obtained was found to store satisfac- 'torily Example 2.
  • -Porous Waterleai paper was im pregnated as described in the preceding enample with a mixture of 45 parte of low viscosity cellulose acetate butyrate having a bu.J yl content of 50%, 50 parts of chlorinated diphenyl having a chlorine content of 65% and 5 parte of dioctyl phthalate.
  • the impregnated paper was then overcoated as described the preceding xample.
  • the paper thus obtained was subbed and then coated with a photosensitive gelatin silver halide emulsion. A translucent photographic paper having goed properties was obtained.
  • Example 3 --Porous waterleaf paper was iinw pregnated as described in Example 1 with a corn-- position of 75 parts or" chlorinated diphenyl having a chlorine content of 65% and 25 parts of cellulose acetate butyrate having a butyryl content of 50% and a viscosity of 10 centipoises. The impregnated paper obtained was then overcoated as described in Example 1. A translucent photographic paper base was obtained having good light transmission.
  • Example 4 Porous Waterleaf paper was iinpregnated las described in Example 1 using a composition of 60 parts of polystyrene having a degree of polymerization of about 60 and 35 parts of butyl stearato. The thus-impregnated paper was overcoated with a melt composition as described in the preceding examples. A translucent photographic paper base having goed properties was obtained.
  • viscosities of cellulose acetate butyrates yare referred to in the above examples they are expressed in the viscosity of Aa solution of one part of the ester in nine parts of acetone at 25 C.
  • the low viscosity butyric acid esters of cellulose which are employed in the melt-coating operation in preparing photographic paper in accordance with our invention are those which have a melting point of less than 200 C., a char point of at least 260 C., and preferably at least 300 C., a fundamental cuprammonium viscosity of not more than centipoises, and an acetone viscosity Within the range of 5-100 centipoises.
  • the cellulose ester should have a butyryl content of at least 42% yand should be hydrolyzed little, if any. For instance, a hydroxyl content of less than 1 hydroxyl per 4 glucose units is typical of the hydroxyl content of cellulose esters which are suitable.
  • Some cellulose esters having the ⁇ properties stated and suitable for melt coating in accordance with our invention are:
  • a Water-prooi translucent paper consisting of paper having a loose porous structure impregnated with ⁇ a composition solid at room temperature consisting of cellulose 'acetate butyrate and chlorinated diphenyl, the latter constituting at least 50% of the composition, which composition has ⁇ a Viscosity of less than 5000 centipoises at C. and a refractive index approximately that of paper and having as an overcoat thereon a coating essentially consisting of cellulose lacetate butyrate, dibutyl seb'acate vand butyl stearate.
  • a water-proof translucent paper consisting of paper having a loose, porous structure impregnated with a composition solid at room temperature consisting of approximately 25 parts oi cellulose 'acetate butyrate and approximately 75 parts chlorinated diphenyl which composition. has a viscosity of less than 5000 centipoises at 170 C. anda refractive index approximately that of paper and having as an overcoat thereon a coating essentially consisting of cellulose acetate butyrate dibutyl sebacate and ybutyl stearate.

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Description

April 21, 1953 M. SAL@ E'TAL 2,635,970
TRANSLUCENT PAPER BASE Filed Nov. 26. 1948 CELLULOSE ACEZITE BUTYAATE COAT/N5 0F D/Bl/TYL SEBACATE Bun/1. .STEM/:TE
(PAPE/e /Mmfsmrfo wmf Bury/MT5 CHLORl/VATE D D/PHE/VYL Mal-fin Salo Haroldlf? Vivian INVENTORS ATTORNEYS' The impregnating composition should contain a resin which imparts adhesiveness to the composition but is yet stable insofar that the resin is compatible with the other ingredients of the composition and is not guilty of blocking when applied as a melt coat. We have found that with cellulose acetate butyrate the chlorinated diphenyls having a chlorine content more than 40% are especially useful as the resin constituent. The cellulose ester employed must be a butyric acid ester of cellulose having a butyryl content of at least 42%.
The plasticizer employed in the impregnating" composition should be a solvent-type plasticizer, such as dioctyl phthalate, dicapryl phthalate, di
4 the paper is preheated to 30G-330 F. and an overcoating composition at a temperature of 340- 360 F. is applied thereto. Any of the melt-coating compositions referred to in my patents listed above or in British Patent No. 540,765, are useful in this operation, particularly to obtain a coating characterized by good iiexibility. The clearance on the rolls employed in the coating operation should be such as to give a coat of .0003 to .0005 inch thickness on each side of the paper sheet. This aggregates 3 pounds of coating per side or 6 .pounds of coating for both sides per 1000 square feet of paper surface. The product which is obtained readily transmits a large proportion butyl sebacate, di-ethyl-hexyl adipate, methoxyethyl phthalate, ethoxyethyl phthalate, and the like. These plasticizers can be mixed to a small' extent with other types of plasticizers providing the resulting material remains of the solvent type o r, in other wo-rds, will dissolve the cellulose ester at a temperature of 170-l80 C. The impregnating composition in addition to having a viscosity below 5000 centipoises at 170 C. must also be a material which exhibits a refractive index close to that of the paper which is treated.
vThe overcoatingcomposition which is applied as the second coat may be any melt-coating composition, such asv described in patents relating thereto. This composition should vbe one which has a blocking p oint at about 200 F. and forms a coating which has satisfactory flexibility. A composition of 75 parts of a cellulose acetate butyratefhaving a butyryl content of 45%, 15 parts of dibutyl sebacate, and 10 parts stearate is useful for this purpose. Various melt-coating compositions which are eminently suitable for this overcoating have been described, such as in Salo Patents Nos. 2,387,773 and 2,387,774. Salo Patent No. 2,439,103 and Meyer Patent No. 2,439,- 093 also` discloses melt-coating compositions useful as the overcoating referred to. Any of these compositions would be useful for the molten overcoating in preparingtranslucent paper base as. described herein. Other melt-coating compositionswhich are useful for overcoating purposes inaccordance with out invention are described in British Patent 100,540.7 65, dated October 29, 1941. The paper in 'accordance with our invention may be, readily prepared by preheating the paper sheet to a Atemperature of G-250 F. and then applyingf thereto in a `melt-coating operation, such as described in British Patent No. 540,765, a melt ofthe impregnating composition held at a temperature of 30D-330 F. The paper is then subjected to pressure, such as by calendering rolls having a temperature of 30G-360 F. at a pressure exceeding 500 p. s. i. and preferably 3000 to v5000 p. s. i. A useful composition in this connection is made up of 50-70% of a chlorinated diaryl, .particularly chlorinated diphenyl, having a chlorine content of at least 40%, 20-30% of a cellulose acetate butyrate having a low viscosity and a butyryl content of at least 45% and 5-15% of a solvent-type plasticizer. Compositions of this nature vare described ad claimed in U. S. Patent No. 2,481,637. Any of the compositions therein 4which have a chlorinated diphenyl or Aoroclor lcontent of at least 50% and a melting point of less thanv 200 C. would be useful for this impregnating operation.
After the impregnated paper has been obtained and the impregnating composition is set, the paper is then given an overcoating by passing the paper through a melt-coating machine in which paper that subbing first be applied. One type of subbing which has been found to be useful in this connection is formed by first applying a very thinlayer of a cellulose nitrate of quitelow viscosity to thev melt coating, followed by a very thin layer of gelatin -applied thereto. The technique of subbing in this manner is described in U. S. Patent No. 2,014,547 of Babcock, granted September 17, 1935. The disclosure of that patent may be referred to as a guide for this type of subbing operation. If desired, instead of vusing two layers, the nitrate and gelatin may be mixed and applied as one layer. Instead of anitrate layer, one may employ a layer of a mixed cellulose ester, such as hydrolyzed cellulose acetate propionate or butyrate. Asa matter of fact, any of the usual types of subbing layers which have been described in the prior art and which are compatible with the photographic emulsion layer to be employed and the melt-coating surface may be used if a subbing layer should be thought to be necessary. The sensitized emulsion which is employed may be any of the usual gelatin silverhalide emulsions. 1n some cases it may be desirable to employ an emulsion in which a cellulose ester isemployed as the protective colloid, such as described and claimedin U. S.. Patent 2,110,491 of Salo. 1 1'The following-examples illustrate four inven..
ion: i 1 y Eamplclr-Porous waterleaf paper was ime pregnated by means of hot calendering rolls. on a Waldron typemelt-coating machine after iirst heating the paper to 200--250v F. and coating it with a melt at 320 F., consisting of 35% Aof cellulose acetate butyrate having a 50% butyryl content and 25 cps. Viscosity, 60% of chlorinated diphenyl having a chlorine content of 65% vand 5% of dioctyl phthalate. After thusimpregnating the paper it was found to transmit a considerable amount of light or, in other words, exhibit a good degree of translucency. The translucent impregnated paper was then overcoated on the melt-coating machine on both sides by heating the paper to 30G-330 F. and then applying at a temperature of 350 F. a melt consisting'4 of. 75 parts of cellulose acetate b-utyrate of 50% butyryl and 25 cps. viscosity, 15 parts of dibutyl sebacate, and l0 parts of butylstearate. The coating rolls were set so as to give a thickness on each: side of approximately .0005 inch, the melt having been applied at the rate ofsix pounds per 1.000 square feet of surface. The coated product which had a light transmission of about 60% was subbedby applying a thin layer of cellulose nitrate oflow viscosity and then a thin layer of gelatin thereto; The paper was then coated with a photosensitiv gelatine-silver l,halide emulsion, land the result-q ing product was found to be satisfactory as a photographic copying and negatif e paper. Also, the product obtained was found to store satisfac- 'torily Example 2.-Porous Waterleai paper was im pregnated as described in the preceding enample with a mixture of 45 parte of low viscosity cellulose acetate butyrate having a bu.J yl content of 50%, 50 parts of chlorinated diphenyl having a chlorine content of 65% and 5 parte of dioctyl phthalate. The impregnated paper was then overcoated as described the preceding xample. The paper thus obtained was subbed and then coated with a photosensitive gelatin silver halide emulsion. A translucent photographic paper having goed properties was obtained.
Example 3.--Porous waterleaf paper was iinw pregnated as described in Example 1 with a corn-- position of 75 parts or" chlorinated diphenyl having a chlorine content of 65% and 25 parts of cellulose acetate butyrate having a butyryl content of 50% and a viscosity of 10 centipoises. The impregnated paper obtained was then overcoated as described in Example 1. A translucent photographic paper base was obtained having good light transmission.
Example 4.-Porous Waterleaf paper was iinpregnated las described in Example 1 using a composition of 60 parts of polystyrene having a degree of polymerization of about 60 and 35 parts of butyl stearato. The thus-impregnated paper was overcoated with a melt composition as described in the preceding examples. A translucent photographic paper base having goed properties Was obtained.
When viscosities of cellulose acetate butyrates yare referred to in the above examples, they are expressed in the viscosity of Aa solution of one part of the ester in nine parts of acetone at 25 C. The low viscosity butyric acid esters of cellulose which are employed in the melt-coating operation in preparing photographic paper in accordance with our invention are those which have a melting point of less than 200 C., a char point of at least 260 C., and preferably at least 300 C., a fundamental cuprammonium viscosity of not more than centipoises, and an acetone viscosity Within the range of 5-100 centipoises. The cellulose ester should have a butyryl content of at least 42% yand should be hydrolyzed little, if any. For instance, a hydroxyl content of less than 1 hydroxyl per 4 glucose units is typical of the hydroxyl content of cellulose esters which are suitable. Some cellulose esters having the `properties stated and suitable for melt coating in accordance With our invention are:
1. Cellulose acetate butyrate, butyryl content 47.7%, acetyl content 6.5%, acetone viscosity 24.9
i centipoises.
2. Cellulose acetate butyrate, butyryl content 49.4%, acetyl content 5.6%, lacetone viscosity centipoises.
3. Cellulose acetate butyrate, butyryl content 48%, acetyl content 6.2%, acetone viscosity 15 Paper Impregnant Overcoating Wt. (lbs.) Wt. (lbs.) 3 Wt. (lbs.) per Loco per Loco per 1,000 56%,;
sq. feet sq. feet sq. feet waterlca. l2 40 8. 9 3() 8. 8 30 D0 12 45 9. 0 33 8 22 hemp paper. l 36 4. S 28 6. 1 36 The preparation of translucent paper base in accordance With our inve-ntion admits of continuous operation in that paper sheet comes in the form of rolls, the usual melt coating machines are adapted for continuous operation, and the temperatures used for impregnating the paper 4correspond fairly closely to those to which it is desirable to preheat the paper in the melt coating operation which constitutes the second step of our process. We have found that by preparing translucent paper base in this manner, the process become-s a unitary operation, the paper going in at one end, being coated with the impregnant, hot calendered, melt coated again to apply the overcoating thereto 'and coming out as a finished product which after having cooled below the melting point of the overcoating, may be collected on rolls.
W e claim:
l. A Water-prooi translucent paper consisting of paper having a loose porous structure impregnated with `a composition solid at room temperature consisting of cellulose 'acetate butyrate and chlorinated diphenyl, the latter constituting at least 50% of the composition, which composition has `a Viscosity of less than 5000 centipoises at C. and a refractive index approximately that of paper and having as an overcoat thereon a coating essentially consisting of cellulose lacetate butyrate, dibutyl seb'acate vand butyl stearate.
2. A water-proof translucent paper consisting of paper having a loose, porous structure impregnated with a composition solid at room temperature consisting of approximately 25 parts oi cellulose 'acetate butyrate and approximately 75 parts chlorinated diphenyl which composition. has a viscosity of less than 5000 centipoises at 170 C. anda refractive index approximately that of paper and having as an overcoat thereon a coating essentially consisting of cellulose acetate butyrate dibutyl sebacate and ybutyl stearate.
MARTIN SALO. HAROLD F. VIVIAN.
References Cited in the file of this patent UNTED STATES PATENTS Number Name Date 2,108,805 Finzel et al. Feb. 22, 1938 2,410,685 Salo et al. Nov. 5, 1945 2,413,764 Hinman Jan. 7, 1947 2,415,631 Galley Feb. 11, 1947 FOREIGN PATENTS Number Country Date 464,280 Great Britain 1937

Claims (1)

  1. 2. A WATER-PROOF TRANSLUCENT PAPER CONSISTING OF PAPER HAVING A LOOSE, POROUS STRUCTURE IMPREGNATED WITH A COMPOSITION SOLID AT ROOM TEMPERATURE CONSISTING OF APPROXIMATELY 25 PARTS OF CELLULOSE ACETATE BUTYRATE AND APPROXIMATELY 75 PARTS CHLORINATED DIPHENYL WHICH COMPOSITION HAS A VISCOSITY OF LESS THAN 5000 CENTIPOISES AT 170* C. AND A REFRACTIVE INDEX APPROXIMATELY THAT OF PAPER AND HAVING AS AN OVERCOAT THEREON A COATING ESSENTIALLY CONSISTING OF CELLULOSE ACETATE BUTYRATE DIBUTYL SEBACATE AND BUTYL STEARATE.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805160A (en) * 1953-02-09 1957-09-03 Eastman Kodak Co Translucent paper
US3245864A (en) * 1955-04-01 1966-04-12 Shanok Abraham Composite molding strip
US4419392A (en) * 1981-08-21 1983-12-06 International Business Machines Corporation Process for producing compact lacquer layers for record carriers
US5626969A (en) * 1992-02-21 1997-05-06 General Binding Corporation Method of manufacturing film for lamination
EP2340329A1 (en) * 2008-10-20 2011-07-06 Teknologian Tutkimuskeskus VTT Modified fibrous product and method of producing the same
US10480126B2 (en) * 2013-12-06 2019-11-19 University Of Maryland At College Park Super clear cellulose paper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB464280A (en) * 1935-10-11 1937-04-12 Winterbottom Book Cloth Compan Improvements in and in the manufacture of transparent fabrics
US2108805A (en) * 1934-06-04 1938-02-22 Du Pont Transparent materials and method of producing same
US2410685A (en) * 1945-10-18 1946-11-05 Eastman Kodak Co Hot melt-coating composition
US2413764A (en) * 1941-06-09 1947-01-07 Frederick Post Company Tracing medium
US2415631A (en) * 1945-03-30 1947-02-11 Eastman Kodak Co Photographic paper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108805A (en) * 1934-06-04 1938-02-22 Du Pont Transparent materials and method of producing same
GB464280A (en) * 1935-10-11 1937-04-12 Winterbottom Book Cloth Compan Improvements in and in the manufacture of transparent fabrics
US2413764A (en) * 1941-06-09 1947-01-07 Frederick Post Company Tracing medium
US2415631A (en) * 1945-03-30 1947-02-11 Eastman Kodak Co Photographic paper
US2410685A (en) * 1945-10-18 1946-11-05 Eastman Kodak Co Hot melt-coating composition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805160A (en) * 1953-02-09 1957-09-03 Eastman Kodak Co Translucent paper
US3245864A (en) * 1955-04-01 1966-04-12 Shanok Abraham Composite molding strip
US4419392A (en) * 1981-08-21 1983-12-06 International Business Machines Corporation Process for producing compact lacquer layers for record carriers
US5626969A (en) * 1992-02-21 1997-05-06 General Binding Corporation Method of manufacturing film for lamination
EP2340329A1 (en) * 2008-10-20 2011-07-06 Teknologian Tutkimuskeskus VTT Modified fibrous product and method of producing the same
EP2340329A4 (en) * 2008-10-20 2013-09-11 Teknologian Tutkimuskeskus Vtt Oy Modified fibrous product and method of producing the same
US10480126B2 (en) * 2013-12-06 2019-11-19 University Of Maryland At College Park Super clear cellulose paper

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