Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1990-08-28
1992-06-23
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
5283086, 5283087, C08G 6302, C08G 6318
Patent
active
051244357
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a polyester copolymer having a high rate of crystallization and providing a shaped article having a high heat resistance.
2. Background Art
Polycyclohexylenedimethylene terephthalate obtained from terephthalic acid and 1,4-cyclohexanedimethanol has a high melting point, and therefore, a molded article obtained from this polymer has a high heat resistance.
In this polymer, as the amount of the trans form of 1,4-cyclohexanedimethanol is increased, the melting point becomes high and the heat resistance of a molded article obtained from this polymer is enhanced, but the glass transition temperature also becomes high and the rate of crystallization is reduced. Accordingly, when it is desired to obtain a molded article having a required heat resistance by using polycyclohexylenedimethylene terephthalate comprising a large proportion of the trans form of 1,4-cyclohexanedimethanol, a problem arises of a narrowing of the applicable range of shaping conditions, such as the mold temperature.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a polyester copolymer having a high rate of crystallization and providing a shaped article having a high heat resistance.
In accordance with the present invention, there is provided a polyester copolymer obtained by reacting (A) a carboxylic acid component composed mainly of terephthalic acid or a derivative thereof with (B) a glycol component comprising (B-1) at least 0.5 mole % but less than 15 mole % of an aliphatic diol having 2 to 16 carbon atoms and (B-2) more than 85 mole % but not more than 99.5 mole % of 1,4-cyclohexanedimethanol having a trans form content of at least 80 mole %.
BEST MODE FOR CARRYING OUT THE INVENTION
The dicarboxylic acid component (A) used in the present invention preferably comprises at least 90 mole % of terephthalic acid or a derivative thereof. As the derivative of terephthalic acid, there can be mentioned dialkyl terephthalates having 1 to 10 carbon atoms in the alkyl group and diaryl terephthalates having 6 to 14 carbon atoms in the aryl group. As specific examples of the derivative of terephthalic acid, there can be mentioned dimethyl terephthalate, diethyl terephthalate, dipropyl terephthalate, dibutyl terephthalate and diphenyl terephthalate.
As the other dicarboxylic acid used in an amount of up to 10 mole % in combination with terephthalic acid or the derivative thereof as the dicarboxylic acid component, there can be mentioned phthalic acid, isophthalic acid, adipic acid, sebacic acid, naphthalene-1,4-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid.
The glycol component (B) used in the present invention comprises (B-1) at least 0.5 mole % but less than 15 mole % of an aliphatic diol having 2 to 16 carbon atoms and (B-2) more than 85 mole % but not more than 99.5 mole % of 1,4-cyclohexanedimethanol in which the trans form content is at least 80 mole %.
As the aliphatic diol (B-1) having 2 to 16 carbon atoms, there can be mentioned ethylene glycol, propylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, octamethylene glycol, butylethylpropanediol, diethylpropanediol and 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5,5]undecane. Ethylene glycol, propylene glycol, tetramethylene glycol and hexamethylene glycol are especially preferably used. These aliphatic diols can be used alone or in the form of a mixture of two or more thereof. An aliphatic diol having more than 16 carbon atoms is not preferred as the aliphatic diol because a polyester copolymer obtained by using this aliphatic diol does not give a shaped article having a satisfactory heat resistance.
The amount of the aliphatic diol (B-1) having 2 to 16 carbon atoms, used in the present invention, is at least 0.5 mole %, but less than 15 mole % based on the glycol component (B). A polyester copolymer in which the amount of the aliphatic diol (B-1) is smaller than 0.5 mole % based on the component (B) is not preferable because the rate of crystal
REFERENCES:
patent: 2901466 (1959-08-01), Kibler et al.
patent: 4045431 (1977-08-01), Fagerburg
patent: 4093603 (1978-06-01), Jackson, Jr. et al.
patent: 4246381 (1981-01-01), Robeson
patent: 4363908 (1982-12-01), Joyner et al.
patent: 4398022 (1983-08-01), Sublett
patent: 4551520 (1985-11-01), Morris et al.
Iwasaki Hitoshi
Mori Hiroshi
Taziri Noriyuki
Yamamoto Naoki
Kight III John
Mitsubishi Rayon Co. Ltd.
Mosley T.
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