JP4362674B2 - polyester - Google Patents

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Publication number
JP4362674B2
JP4362674B2 JP2000322674A JP2000322674A JP4362674B2 JP 4362674 B2 JP4362674 B2 JP 4362674B2 JP 2000322674 A JP2000322674 A JP 2000322674A JP 2000322674 A JP2000322674 A JP 2000322674A JP 4362674 B2 JP4362674 B2 JP 4362674B2
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Japan
Prior art keywords
mol
polyester
dicarboxylic acid
acid
general formula
Prior art date
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JP2000322674A
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Japanese (ja)
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JP2002128881A (en
Inventor
大 小黒
武夫 林
岳志 広兼
正弘 黒川
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Mitsubishi Gas Chemical Co Inc
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Mitsubishi Gas Chemical Co Inc
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Priority to JP2000322674A priority Critical patent/JP4362674B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は新規なポリエステルに関し、更に詳しくは、耐熱性、光学特性、機械的特性、耐候性、発泡特性に優れたポリエステルに関するものである。
【0002】
【従来の技術】
汎用ポリエステルであるPET(ポリエチレンテレフタレート)は抗張力、伸度、ヤング率、弾性回復率等の機械的性質、耐熱性、寸法安定性等の物理的性質、耐薬品性、耐水性等の化学的性質が優れ、安価であるために工業的に大きな価値を有していることは良く知られており、例えば、繊維、タイヤコード、ボトル、フィルム等で多く用いられている。しかしながら、ホモポリマーであるPETは耐衝撃性に劣り、結晶化により白化しやすいため、耐衝撃性及び透明性が要求されるシート分野ではあまり用いられていない。これらの分野では、低結晶化速度、耐衝撃性、透明性、高強度、低収縮率(高寸法性)などが要求されている。
【0003】
上記理由により、シクロヘキサンジメタノール(以下、「CHDM」という)をPETに共重合したアモルファスPET(以下、「PET−G」という)が上市されている。PET−Gは、透明性、耐衝撃性、耐候性、耐油性、保香性、強度特性、食品衛生性、非吸着性、無臭性、深絞り特性など特に食品容器に適する性能を多く有している。更に、この樹脂は、燃焼カロリーが低く、有害ガスの発生がなく、環境問題、更に環境ホルモンの問題が高まる中、ポリ塩化ビニル(以下、「PVC」という)シートによる成形品からの代替ニーズが期待されている。しかしながら、PET−Gは耐熱性、耐候性に劣るために、それらが要求される分野、例えば電照板、カーポート、ボトル等では、使用が制限されてきた。
【0004】
【発明が解決しようとする課題】
本発明の目的は、上述の従来技術の問題点に鑑み、接着性、加工性、光学特性、耐候性、機械的性能、溶融粘度特性に優れた新規なポリエステルを提供することにある。
【0005】
【課題を解決するための手段】
本発明者らは上述の目的を達成するために鋭意検討の結果、特定量の下記一般式(1)で表されるグリコール(以下、「DOG」と記載することがある)を一定量含むポリエステルが、優れた接着性、加工性、光学特性、耐候性、機械的性能、高い溶融粘度を有することを見い出し、本発明に到達した。
【0006】
すなわち、本発明は、下記一般式(1)で表されるグリコールを15モル%以上含むジオールと、芳香族及び/又は脂環族ジカルボン酸を含むジカルボン酸成分とを重縮合して得られるポリエステルであって、フェノールと1,1,2,2−テトラクロロエタンとの質量比が4:6の混合溶媒を用いて25℃で測定した極限粘度が0.3〜2.0の範囲であり、且つ厚さ3mmのシートにおける全光線透過率が88%以上であるポリエステルに関する発明である。
【0007】
【化2】
【0008】
式(1)中、mは、0〜4の整数であり、Rは、エチレン基、プロピレン基
又はブチレン基である。
【0009】
本発明のポリエステルは、95モル%以上の芳香族及び/又は脂環族ジカルボン酸からなるジカルボン酸と、DOGを5モル%以上含むジオールから重縮合して得られるポリエステルである。芳香族及び脂環族ジカルボン酸としては、イソフタル酸、フタル酸、2−メチルテレフタル酸、ナフタレンジカルボン酸、ビフェニルジカルボン酸、シクロヘキサンジカルボン酸、デカリンジカルボン酸、テトラリンジカルボン酸、ノルボルナンジカルボン酸、トリシクロデカンジカルボン酸、ペンタシクロドデカンジカルボン酸、イソホロンジカルボン酸等が挙げられる。
【0010】
本発明では、機械的特性を高めるために、全ジカルボン酸成分の5モル%を未満の範囲で、脂肪族ジカルボン酸及び/又はその誘導体を使用できる。脂肪族ジカルボン酸を前記5モル%未満とすることにより耐熱性及び透明性が向上する。ジカルボン酸の種類は特に制限はなく、ポリエステルの原料として使用できるすべてのジカルボン酸を用いることができる。ただし、1種類以上のジカルボン酸が含まれていてもよい。具体的な繰り返し成分単位として、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸、ドデカンジカルボン酸等が挙げられる。
【0011】
一般式(1)で表されるグリコール以外のアルキレングリコールの種類は、特に制限はなく、ポリエステルの原料として使用できるすべてのアルキレングリコールを用いることができる。ただし、1種類以上のアルキレングリコールが含まれていてもよい。具体的な繰り返し成分単位として、トリメチレングリコール、1,4−ブタンジオール、1,5−ペンタンジオール、1,6−ヘキサンジオール、ジエチレングリコール、プロピレングリコール、ネオペンチルグリコール等の脂肪族ジオール類、ポリエチレングリコール、ポリプロピレングリコール、ポリブチレングリコール等のポリエーテル化合物類、3,9−ビス(1,1−ジメチル−2−ヒドロキシエチル)2,4,8,10−テトラオキサスピロ〔5.5〕ウンデカン、1,3−シクロヘキサンジメタノール、1,4−シクロヘキサンジメタノール、1,2−デカヒドロナフタレンジメタノール、1,3−デカヒドロナフタレンジメタノール、1,4−デカヒドロナフタレンジメタノール、1,5−−デカヒドロナフタレンジメタノール、1,6−デカヒドロナフタレンジメタノール、2,7−デカヒドロナフタレンジメタノール、テトラリンジメタノール、ノルボルナンジメタノール、トリシクロデカンジメタノール、ペンタシクロドデカンジメタノール等の脂環族ジオール類、4,4’−(1−メチルエチリデン)ビスフェノール、メチレンビスフェノール(ビスフェノールF)、4,4’−シクロヘキシリデンビスフェノール(ビスフェノールZ)、4,4’−スルホニルビスフェノール(ビスフェノールS)等のビスフェノール類のアルキレンオキシド付加物、ヒドロキノン、レゾルシン、4,4’―ジヒドロキシビフェニル、4,4’―ジヒドロキシジフェニルエーテル、4,4’―ジヒドロキシジフェニルベンゾフェノン等の芳香族ジヒドロキシ化合物のアルキレンオキシド付加物等がある。
【0012】
本発明のポリエステルは、一般式(1)で表されるグリコールを5モル%以上、好ましくは15モル%以上、更に好ましくは30モル%以上含むジオール成分と、芳香族及び/又は脂環族ジカルボン酸成分を95モル%以上含むジカルボン酸成分とを重縮合して得られるポリエステルである。一般式(1)で表されるグリコールを所定割合配合して重縮合して得られるポリエステルは、光学特性、耐熱性、各種機械強度において向上された効果を示す。
【0013】
また、混合溶媒(フェノール/1,1,2,2−テトラクロロエタンの質量比:4/6)を使用して25℃で測定した際の極限粘度が0.3〜2.0、好ましくは0.4〜1.5の範囲のものである。極限粘度が前記0.3以上で優れた機械的強度が得られ、前記2.0以下で優れた成形性が得られる。
【0014】
本発明のポリエステルを製造する方法に特に制限はなく、従来公知の方法を適用することが出来る。例えばエステル交換法、直接エステル化法等の溶融重合法または溶液重合法を挙げることが出来る。エステル交換触媒、エステル化触媒、エーテル化防止剤、また重合に用いる重合触媒、熱安定剤、光安定剤等の各種安定剤、重合調整剤等も従来既知のものを用いることが出来る。エステル交換触媒として、マンガン、コバルト、亜鉛、チタン、カルシウム等の化合物、またエステル化触媒として、マンガン、コバルト、亜鉛、チタン、カルシウム等の化合物、またエーテル化防止剤としてアミン化合物等が例示される。重縮合触媒としてはゲルマニウム、アンチモン、スズ、チタン等の化合物が例示される。また熱安定剤としてリン酸、亜リン酸、フェニルホスホン酸等の各種リン化合物を加えることも有効である。その他光安定剤、帯電防止剤、滑剤、酸化防止剤、離型剤等を加えても良い。また、直接エステル化法において、スラリー性改善のために水を加えても良い。
【0015】
本発明のポリエステルは,PET等と同様に公知の方法により、スクリュー式射出成形機等を用いて成形することが出来る。本発明のポリエステル成形品は優れた耐熱性、光学特性、機械的特性、耐候性を有し、曲げ応力451kPa時の荷重たわみ温度が70℃上、弾性率が1.5GPa以上、強度が40MPa以上、厚さ3mmでのシートの全光線透過率が88%以上の特性が得られる。
【0016】
【実施例】
以下実施例により本発明を更に具体的に説明する。但し本発明はこれらの実施例により限定するものではない。
以下の実施例において、ポリマーの物性の測定等は以下の方法によった。
(1)ガラス転移温度及び融点
ポリマーのガラス転移温度(Tg)及び融点(Tm)は、(株)島津製作所製、示差走査型熱量計(型式:DSC/TA−50WS)を使用し、試料約10mgをアルミニウム製非密封容器に入れ、窒素ガス(30ml/min)気流中昇温速度20℃/minで測定した。
(2)極限粘度
混合溶媒(フェノール/1,1,2,2−テトラクロロエタンの質量比:4/6)を用いて25℃恒温下で測定した。
【0017】
また、射出成形品の物性の測定等は以下の方法によった。
(1)引張物性:ASTM D638に準じた。
(2)曲げ物性:ASTM D790に準じた。
(3)落錘衝撃強度:3mm厚100mmφの円盤シートを用いて落錘強度を測定した。測定条件は、衝撃速度 10(m/s) 錘の重量9.4(kg)で行った。
(4)ロックウェル硬さ:ASTM D785に準じた。
(5)荷重たわみ温度:ASTM D648に準じた。試験片に加える曲げ応力は451kPaで行った。
(6)全光線透過率:ASTM D1003に準じた。
(7)耐候性(雨無し):JIS K7105に基づき、サンシャインフェードメータを使用して測定した。表1中に記す条件下でブラックライト照射を行い、試験前後の色差ΔE=(ΔL2 +Δa2 +Δb2 1/2 を求めた。
【0018】
実施例1
ジメチルテレフタレート(以下、「DMT」という)12948g(66.7モル)、エチレングリコール(以下「EG」という)8236g(133モル)、5-メチロール−5−エチル−2−(1,1−ジメチル−2−ヒドロキシエチル)−1,3−ジオキサン(以下「DOG」という)3056g(14.0モル)、並びにDMT100モルに対し酢酸マンガン四水和物を0.03モル%、及びトリエチルアミン(以下「TEA」という)0.05モルを加え、窒素雰囲気下で200℃迄昇温して4時間エステル交換反応を行った。所定量のメタノールを留去した後、DMT100モルに対し酸化ゲルマニウム0.05モルとトリフェニルホスフェート(以下「TPP」という)0.05モルを加え、昇温と減圧を徐々に行い、最終的に280℃、0.1kPa以下で重合を行った。適度な溶融粘度になった時点で反応を終了し、DOGを19モル%含有するポリエステルを得た。なお、ポリマー中のDOG含量は1H−NMR(400MHz)により求めた。
【0019】
〔射出成形品の作製〕
得られたポリエステルを真空乾燥した後、スクリュー式射出成形機(スクリュー直径:32mmφ、型締力:9.8kN)により試験片を成形した。成形はシリンダー温度255℃、金型温度35℃の条件を行った。試験片の各種物性測定の結果を表1に示す。
【0020】
実施例2
DMT12356g(63.6モル)、EG7978g(128.5モル)、DOG3484g(11.5モル)、並びにDMT100モルに対し酢酸マンガン四水和物0.03、及びTEA0.05を加え、実施例1と同様な操作でポリマーを得た。DOGを40モル%含有するポリエステルを得た。なお、ポリマー中のDOG含量は1H−NMR(400MHz)により求めた。
【0021】
〔射出成形品の作製〕
得られたポリエステルを真空乾燥した後、スクリュー式射出成形機(スクリュー直径:32mmφ、型締力:9.8kN)により試験片を成形した。成形はシリンダー温度240℃、金型温度40℃の条件を行った。試験片の各種物性測定の結果を表1に示す。
【0022】
比較例1
〔射出成形品の作製〕
CHDM32モル%共重合PET(イーストマン社製、Easter 6762)をスクリュー式射出成形機(スクリュー直径:32mmφ、型締力:9.8kN)により試験片を成形した。成形はシリンダー温度230℃、金型温度40℃の条件を行った。成形品の各種物性測定の結果を表1に示す。
【0023】
比較例2
DMT14430g(74.3モル)、EG9962g(160.5モル)、DOG904g(2.97モル)、並びにDMT100モルに対し酢酸マンガン四水和物0.03モル、及びTEA0.05モルを加え、実施例1と同様な操作でポリマーを得た。DOG残基を4モル%含有するポリエステルを得た。なお、ポリマー中のDOG残基は1H−NMR(400MHz)により求めた。
【0024】
射出成形品の作製
得られたポリエステルを真空乾燥した後、スクリュー式射出成形機(スクリュー直径:32mmφ、型締力:9.8kN)により試験片を成形した。成形はシリンダー温度240℃、金型温度40℃の条件を行った。成形品の各種物性測定の結果を表1に示す。
【0025】
【0026】
【発明の効果】
以上の実施例からも明らかなように、本発明の一般式(1)で表されるグリコールを5モル%以上含むジオールと、芳香族及び/又は脂環族ジカルボン酸を95モル%以上含むジカルボン酸とを重縮合して得られるポリエステルは、接着性、加工性、耐熱性、機械的特性、光学特性、耐候性、発泡特性に優れており、これらの特性を利用して各種用途に利用できる。
すなわち本発明のポリエステルは、フィルム、シート、ボトル、発泡体または樹脂の形態として、例えば電照板、ICカード、ディスプレイ表示画面板、緩衝材、発泡シート、発泡成形体、飲料用ボトル、サーバー等、また光ディスク基板、プラスチックファイバー、プラスチックレンズ等の光学用成形品に有用な素材として用いることができ、本発明の工業的意義は大きい。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel polyester, and more particularly to a polyester excellent in heat resistance, optical properties, mechanical properties, weather resistance, and foaming properties.
[0002]
[Prior art]
PET (polyethylene terephthalate), a general-purpose polyester, has mechanical properties such as tensile strength, elongation, Young's modulus and elastic recovery rate, physical properties such as heat resistance and dimensional stability, and chemical properties such as chemical resistance and water resistance. It is well known that it has great industrial value because it is excellent and inexpensive, and for example, it is often used in fibers, tire cords, bottles, films and the like. However, PET, which is a homopolymer, is inferior in impact resistance and easily whitened by crystallization. Therefore, it is rarely used in the sheet field where impact resistance and transparency are required. In these fields, low crystallization speed, impact resistance, transparency, high strength, low shrinkage (high dimensionality), and the like are required.
[0003]
For the above reasons, amorphous PET (hereinafter referred to as “PET-G”) obtained by copolymerizing cyclohexanedimethanol (hereinafter referred to as “CHDM”) with PET has been put on the market. PET-G has many properties that are particularly suitable for food containers, such as transparency, impact resistance, weather resistance, oil resistance, aroma retention, strength characteristics, food hygiene, non-adsorption, odorlessness, and deep drawing characteristics. ing. Furthermore, this resin has a low calorie calorie, no generation of harmful gases, and environmental problems and further environmental hormone problems are increasing, there is a need for replacement from molded products with polyvinyl chloride (hereinafter referred to as “PVC”) sheets. Expected. However, since PET-G is inferior in heat resistance and weather resistance, its use has been limited in fields where they are required, for example, lighting plates, carports, bottles and the like.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a novel polyester excellent in adhesiveness, workability, optical properties, weather resistance, mechanical performance, and melt viscosity properties in view of the above-mentioned problems of the prior art.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the inventors of the present invention have a specific amount of a specific amount of glycol represented by the following general formula (1) (hereinafter sometimes referred to as “DOG”). Was found to have excellent adhesion, workability, optical properties, weather resistance, mechanical performance, and high melt viscosity, and reached the present invention.
[0006]
That is, the present invention provides a polyester obtained by polycondensation of a diol containing 15 mol% or more of a glycol represented by the following general formula (1) and a dicarboxylic acid component containing an aromatic and / or alicyclic dicarboxylic acid. a is the weight ratio of phenol and 1,1,2,2-tetrachloroethane 4: intrinsic viscosity measured at 25 ° C. using a mixed solvent of 6 Ri range der of 0.3 to 2.0 The invention relates to a polyester having a total light transmittance of 88% or more in a sheet having a thickness of 3 mm .
[0007]
[Chemical formula 2]
[0008]
In formula (1), m is an integer of 0 to 4, and R is an ethylene group, a propylene group, or a butylene group.
[0009]
The polyester of the present invention is a polyester obtained by polycondensation of 95 mol% or more of an aromatic and / or alicyclic dicarboxylic acid and a diol containing 5 mol% or more of DOG. Aromatic and alicyclic dicarboxylic acids include isophthalic acid, phthalic acid, 2-methylterephthalic acid, naphthalene dicarboxylic acid, biphenyl dicarboxylic acid, cyclohexane dicarboxylic acid, decalin dicarboxylic acid, tetralin dicarboxylic acid, norbornane dicarboxylic acid, tricyclodecane Examples include dicarboxylic acid, pentacyclododecanedicarboxylic acid, isophorone dicarboxylic acid, and the like.
[0010]
In the present invention, an aliphatic dicarboxylic acid and / or a derivative thereof can be used in an amount of less than 5 mol% of the total dicarboxylic acid component in order to enhance mechanical properties. When the aliphatic dicarboxylic acid is less than 5 mol%, heat resistance and transparency are improved. There is no restriction | limiting in particular in the kind of dicarboxylic acid, All the dicarboxylic acids which can be used as a raw material of polyester can be used. However, one or more kinds of dicarboxylic acids may be included. Specific repeating component units include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid and the like.
[0011]
There is no restriction | limiting in particular in the kind of alkylene glycol other than the glycol represented by General formula (1), All the alkylene glycol which can be used as a raw material of polyester can be used. However, one or more types of alkylene glycol may be contained. Specific repeating component units include trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, propylene glycol, neopentyl glycol and other aliphatic diols, polyethylene glycol Polyether compounds such as polypropylene glycol and polybutylene glycol, 3,9-bis (1,1-dimethyl-2-hydroxyethyl) 2,4,8,10-tetraoxaspiro [5.5] undecane, , 3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 1,2-decahydronaphthalene diethanol, 1,3-decahydronaphthalene diethanol, 1,4-decahydronaphthalene diethanol, 1,5-- Decahydronaphthalene methano 1,6-decahydronaphthalene diethanol, 2,7-decahydronaphthalene diethanol, tetralin dimethanol, norbornane dimethanol, tricyclodecane dimethanol, pentacyclododecane dimethanol, etc., 4 , 4 ′-(1-methylethylidene) bisphenol, methylene bisphenol (bisphenol F), 4,4′-cyclohexylidene bisphenol (bisphenol Z), 4,4′-sulfonyl bisphenol (bisphenol S) and other alkylenes of bisphenols Alkylene oxides of aromatic dihydroxy compounds such as oxide adducts, hydroquinone, resorcin, 4,4'-dihydroxybiphenyl, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenylbenzophenone There is Sid adducts.
[0012]
The polyester of the present invention comprises a diol component containing 5 mol% or more, preferably 15 mol% or more, more preferably 30 mol% or more of the glycol represented by the general formula (1), and an aromatic and / or alicyclic dicarboxylic acid. It is a polyester obtained by polycondensation with a dicarboxylic acid component containing 95 mol% or more of an acid component. The polyester obtained by blending a predetermined proportion of the glycol represented by the general formula (1) and polycondensing exhibits improved effects in optical properties, heat resistance and various mechanical strengths.
[0013]
Further, the intrinsic viscosity when measured at 25 ° C. using a mixed solvent (mass ratio of phenol / 1,1,2,2-tetrachloroethane: 4/6) is 0.3 to 2.0, preferably 0. In the range of 4-1.5. Excellent mechanical strength is obtained when the intrinsic viscosity is 0.3 or more, and excellent moldability is obtained when the intrinsic viscosity is 2.0 or less.
[0014]
There is no restriction | limiting in particular in the method to manufacture the polyester of this invention, A conventionally well-known method is applicable. Examples thereof include a melt polymerization method such as a transesterification method and a direct esterification method, or a solution polymerization method. As the transesterification catalyst, esterification catalyst, etherification inhibitor, polymerization catalyst used in the polymerization, various stabilizers such as a heat stabilizer and a light stabilizer, polymerization regulators and the like, conventionally known ones can be used. Examples of the transesterification catalyst include compounds such as manganese, cobalt, zinc, titanium and calcium; examples of the esterification catalyst include compounds such as manganese, cobalt, zinc, titanium and calcium; and examples of the etherification inhibitor include amine compounds. . Examples of the polycondensation catalyst include compounds such as germanium, antimony, tin, and titanium. It is also effective to add various phosphorus compounds such as phosphoric acid, phosphorous acid, and phenylphosphonic acid as a heat stabilizer. In addition, a light stabilizer, an antistatic agent, a lubricant, an antioxidant, a release agent and the like may be added. In the direct esterification method, water may be added to improve the slurry property.
[0015]
The polyester of the present invention can be molded by a known method using a screw type injection molding machine or the like in the same manner as PET. The polyester molded product of the present invention has excellent heat resistance, optical properties, mechanical properties, and weather resistance, the deflection temperature under load when the bending stress is 451 kPa is 70 ° C., the elastic modulus is 1.5 GPa or more, and the strength is 40 MPa or more. The characteristic that the total light transmittance of the sheet at a thickness of 3 mm is 88% or more is obtained.
[0016]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
In the following examples, the physical properties of polymers were measured by the following methods.
(1) Glass transition temperature and melting point The glass transition temperature (Tg) and melting point (Tm) of the polymer were measured by using a differential scanning calorimeter (model: DSC / TA-50WS) manufactured by Shimadzu Corporation. 10 mg was placed in an aluminum non-sealed container and measured in a nitrogen gas (30 ml / min) stream at a temperature elevation rate of 20 ° C./min.
(2) Measurement was performed at a constant temperature of 25 ° C. using an intrinsic viscosity mixed solvent (mass ratio of phenol / 1,1,2,2-tetrachloroethane: 4/6).
[0017]
The physical properties of the injection molded product were measured by the following method.
(1) Tensile properties: Conforms to ASTM D638.
(2) Bending physical properties: conforming to ASTM D790.
(3) Drop weight impact strength: The drop weight strength was measured using a disk sheet of 3 mm thickness and 100 mmφ. The measurement conditions were an impact speed of 10 (m / s) and a weight weight of 9.4 (kg).
(4) Rockwell hardness: Conforms to ASTM D785.
(5) Deflection temperature under load: Conforms to ASTM D648. The bending stress applied to the test piece was 451 kPa.
(6) Total light transmittance: Conforms to ASTM D1003.
(7) Weather resistance (no rain): measured using a sunshine fade meter based on JIS K7105. Black light irradiation was performed under the conditions described in Table 1, and the color difference ΔE = (ΔL 2 + Δa 2 + Δb 2 ) 1/2 before and after the test was determined.
[0018]
Example 1
12948 g (66.7 mol) of dimethyl terephthalate (hereinafter referred to as “DMT”), 8236 g (133 mol) of ethylene glycol (hereinafter referred to as “EG”), 5-methylol-5-ethyl-2- (1,1-dimethyl-) 2-hydroxyethyl) -1,3-dioxane (hereinafter referred to as “DOG”) 3056 g (14.0 mol), and 0.03 mol% of manganese acetate tetrahydrate with respect to 100 mol of DMT, and triethylamine (hereinafter referred to as “TEA”). 0.05 mol) was added, the temperature was raised to 200 ° C. under a nitrogen atmosphere, and a transesterification reaction was carried out for 4 hours. After distilling a predetermined amount of methanol, 0.05 mol of germanium oxide and 0.05 mol of triphenyl phosphate (hereinafter referred to as “TPP”) are added to 100 mol of DMT, and the temperature is gradually increased and the pressure is gradually reduced. Polymerization was performed at 280 ° C. and 0.1 kPa or less. The reaction was terminated when the melt viscosity reached an appropriate level, and a polyester containing 19 mol% of DOG was obtained. The DOG content in the polymer was determined by 1H-NMR (400 MHz).
[0019]
[Production of injection molded products]
After the obtained polyester was vacuum-dried, a test piece was molded by a screw type injection molding machine (screw diameter: 32 mmφ, mold clamping force: 9.8 kN). Molding was performed under the conditions of a cylinder temperature of 255 ° C. and a mold temperature of 35 ° C. Table 1 shows the results of measuring various physical properties of the test pieces.
[0020]
Example 2
DMT12356 g (63.6 mol), EG7978 g (128.5 mol), DOG3484 g (11.5 mol), and manganese acetate tetrahydrate 0.03 and TEA0.05 were added to 100 mol of DMT. A polymer was obtained in the same manner. A polyester containing 40 mol% of DOG was obtained. The DOG content in the polymer was determined by 1H-NMR (400 MHz).
[0021]
[Production of injection molded products]
After the obtained polyester was vacuum-dried, a test piece was molded by a screw type injection molding machine (screw diameter: 32 mmφ, mold clamping force: 9.8 kN). Molding was performed under the conditions of a cylinder temperature of 240 ° C. and a mold temperature of 40 ° C. Table 1 shows the results of measuring various physical properties of the test pieces.
[0022]
Comparative Example 1
[Production of injection molded products]
A test piece was molded from CHDM 32 mol% copolymerized PET (Eastman Co., Ester 6762) using a screw injection molding machine (screw diameter: 32 mmφ, mold clamping force: 9.8 kN). Molding was performed under the conditions of a cylinder temperature of 230 ° C. and a mold temperature of 40 ° C. Table 1 shows the results of measuring various physical properties of the molded product.
[0023]
Comparative Example 2
DMT 14430 g (74.3 mol), EG9962 g (160.5 mol), DOG 904 g (2.97 mol) and manganese acetate tetrahydrate 0.03 mol and TEA 0.05 mol were added to 100 mol of DMT. In the same manner as in No. 1, a polymer was obtained. A polyester containing 4 mol% of DOG residues was obtained. The DOG residue in the polymer was determined by 1H-NMR (400 MHz).
[0024]
Preparation of injection-molded article After the obtained polyester was vacuum-dried, a test piece was molded by a screw-type injection molding machine (screw diameter: 32 mmφ, mold clamping force: 9.8 kN). Molding was performed under the conditions of a cylinder temperature of 240 ° C. and a mold temperature of 40 ° C. Table 1 shows the results of measuring various physical properties of the molded product.
[0025]
[0026]
【The invention's effect】
As is clear from the above examples, a diol containing 5 mol% or more of the glycol represented by the general formula (1) of the present invention and a dicarboxylic acid containing 95 mol% or more of an aromatic and / or alicyclic dicarboxylic acid. Polyester obtained by polycondensation with acid is excellent in adhesiveness, workability, heat resistance, mechanical properties, optical properties, weather resistance, and foaming properties, and can be used for various applications using these properties. .
That is, the polyester of the present invention is in the form of a film, a sheet, a bottle, a foam or a resin. Further, it can be used as a material useful for optical molded products such as optical disk substrates, plastic fibers, plastic lenses, etc., and the industrial significance of the present invention is great.

Claims (5)

下記一般式(1)で表されるグリコールを15モル%以上含むジオールと、芳香族及び/又は脂環族ジカルボン酸を95モル%以上含むジカルボン酸とを重縮合して得られるポリエステルであって、フェノールと1,1,2,2−テトラクロロエタンとの質量比が4:6の混合溶媒を用いて25℃で測定した極限粘度が0.3〜2.0の範囲であり、且つ厚さ3mmのシートにおける全光線透過率が88%以上であるポリエステル。
式(1)中、mは、0〜4の整数であり、Rは、エチレン基、プロピレン基又はブチレン基である。
A polyester obtained by polycondensation of a diol containing 15 mol% or more of a glycol represented by the following general formula (1) and a dicarboxylic acid containing 95 mol% or more of an aromatic and / or alicyclic dicarboxylic acid, The intrinsic viscosity measured at 25 ° C. using a mixed solvent having a mass ratio of phenol and 1,1,2,2-tetrachloroethane of 4: 6 at 25 ° C. is in the range of 0.3 to 2.0, and has a thickness of Polyester having a total light transmittance of 88% or more in a 3 mm sheet.
In formula (1), m is an integer of 0 to 4, and R is an ethylene group, a propylene group, or a butylene group.
ジカルボン酸が、テレフタル酸である請求項1に記載のポリエステル。  The polyester according to claim 1, wherein the dicarboxylic acid is terephthalic acid. 一般式(1)が5−メチロール−5−エチル−2−(1,1−ジメチル−2−ヒドロキシエチル)−1,3−ジオキサンである請求項1に記載のポリエステル。  The polyester according to claim 1, wherein the general formula (1) is 5-methylol-5-ethyl-2- (1,1-dimethyl-2-hydroxyethyl) -1,3-dioxane. ジオールが一般式(1)とエチレングリコールからなることを特徴とする請求項1ないし3のいずれかに記載のポリエステル。  The polyester according to any one of claims 1 to 3, wherein the diol comprises the general formula (1) and ethylene glycol. 曲げ応力451kPa時の荷重たわみ温度が70℃以上であり、弾性率が1.5GPa以上であり、強度が40MPa以上である請求項1ないし4のいずれかに記載のポリエステル。  The polyester according to any one of claims 1 to 4, wherein a deflection temperature under load at a bending stress of 451 kPa is 70 ° C or more, an elastic modulus is 1.5 GPa or more, and a strength is 40 MPa or more.
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