Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1990-08-28
1992-03-10
Kight, III., John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528307, 5287081, 5283086, C08G 6302
Patent
active
050950894
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a polyester copolymer which gives a shaped article having a high heat resistance and which has a low rate of crystallization.
2. Background Art
Polycyclohexylenedimethylene terephthalate obtained from terephthalic acid and 1,4-cyclohexanedimethanol has a high melting point, and therefore, this polyester has a high heat resistance and a high resistance against the hydrolysis.
Attempts have been made to use this polyester as films or bottles by utilizing this characteristic property. This polyester, however, involves a problem in that since the polyester is readily crystallized, the range of the shaping conditions is narrow.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a polyester copolymer having a low rate of crystallization and providing a shaped article having a high heat resistance.
More specifically, in accordance with the present invention, there is provided a polyester copolymer obtained by reacting (A) a dicarboxylic acid component composed mainly of terephthalic acid or a derivative thereof with (B) a glycol component comprising (B-1) 15 to 85 mole % of an aliphatic diol having 2 to 16 carbon atoms and (B-2) 85 to 15 mole % of 1,4-cyclohexanedimethanol in which the trans-form content is 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 terephthalic acid derivative, there can be mentioned dialkyl esters of terephthalic acid having 1 to 10 carbon atoms in the alkyl group and diaryl esters of terephthalic acid having 6 to 14 carbon atoms in the aryl group. As specific examples of the terephthalic acid derivative, there can be mentioned dimethyl terephthalate, diethyl terephthalate, dipropyl terephthalate, dibutyl terephthalate and diphenyl terephthalate.
As the other dicarboxylic acid that can be used together with terephthalic acid or its derivative in an amount of not more than 10 mole % of 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) 15 to 85 mole % of an aliphatic diol having 2 to 16 carbon atoms and (B-2) 85 to 15 mole % of 1,4-cyclohexanedimethanol in which the content of the trans-form 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, butylethyl propanediol, diethyl propanediol and 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5,5]undecane, and 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. A polyester copolymer obtained by using an aliphatic diol having more than 16 carbon atoms as the aliphatic diol is not preferred because a shaped article obtained from this copolymer has not a satisfactory heat resistance.
The amount of the aliphatic diol (B-1) having 2 to 16 carbon atoms is 15 to 85 mole %, preferably 30 to 70 mole %, based on the glycol component (B). The polyester copolymer in which the content of the component (B-1) is less than 15 mole % based on the component (B) cannot be used for attaining the object of the present invention, because the rate of crystallization of the polyester copolymer is high. The polyester copolymer in which the content of the component (B-1) is higher than 85 mole % based on the component (B) is not preferably used, because the rate of crystallization becomes high or the glass transition temperature is too low.
The content of the trans-form in 1,4-cyclohexanedimethanol (B-2) used in the present invention must be at least 80 mole %. A shaped ar
REFERENCES:
patent: 2901466 (1959-08-01), Kibler et al.
patent: 4246381 (1981-01-01), Robeson
patent: 4259478 (1981-03-01), Jackson, Jr. et al.
patent: 4557982 (1985-12-01), Nouda et al.
patent: 4668764 (1987-05-01), Satou
patent: 4786692 (1988-11-01), Allen et al.
patent: 4900610 (1990-02-01), Hochberg et al.
Iwasaki Hitoshi
Mori Hiroshi
Taziri Noriyuki
Yamamoto Naoki
Acquah Sam A.
Kight, III. John
Mitsubishi Rayon Company Ltd.
LandOfFree
Polyester copolymer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyester copolymer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyester copolymer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2285530