# US 5,349,039 A · Soluble polyesterimide

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- Number: US 5,349,039 A
- Document ID: US5349039A
- Status: Granted
- Kind: A
- Application number: 07/963,464
- Filed: 1992-10-20
- Granted: 1994-09-20
- Earliest claimed: 1992-10-20
- Assignees: Industrial Technology Research Institute
- Inventors: Chien-Hui Li; Tzong-Ming Lee; Jyh-Chien Chen
- Web page: https://patentgrep.com/patent/US5349039A

## CPC

- C08G 73/16: Polyester-imides
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Disclosed is a polyester-imide prepared from a condensation polymerization of aromatic diacid, diimide diacid, and diol, having a carboxy to hydroxy equivalent molar ratio of 0.9:1 to 1.1:1. The disclosed polyester-imide has outstanding heat-resistance, remarkable filming ability, and high solubility in both phenol series and amide series solvents.

## Claims

### Claim 1

An amide and phenol series solvents soluble polyester-imide, having a carboxy to hydroxy equivalent molar ratio of 0.9:1 to 1.1:1 produced from:
(a) aromatic diacid selected from the group consisting of
(a.sub.1) terephthalic acid(TPA),
(a.sub.2) isophthalic acid(IPA), and
mixture thereof, and having a ratio of TPA:EPA of 1:0 to 0:1 and comprising 0-49 molar percent of the total ingredients;
(b) an imide diacid selected from the group consisting of
(b.sub.1) a diimide diacid having the formula as follows: ##STR4## wherein x is selected from the group consisting of O, S, SO.sub.2, CO, and CH.sub.2,
(b.sub.2) a monoimide having the formula as follows: ##STR5## and (b.sub.3) a monoimide having the formula as follows: ##STR6## and mixtures thereof, and comprising 1-50 molar percent of the total ingredients; and
(c) aryl diol selected from the group consisting of
(c.sub.1) having the formula as follows: ##STR7## wherein Y is selected from the group consisting of C(CH.sub.3).sub.2, SO.sub.2, and S, and
(c.sub.2) a mixture of hydroquinone(HQ) and resorcinol(RC) with a mixing molar ratio of 1:0 to 1:1,
and comprising 50 molar percent of the total ingredients.

### Claim 2 (depends on 1)

A method of preparing said polyester-imide as defined in claim 1, which comprises:
(a) mixing the aromatic diacid and the diimide diacid according to claim 1; and
(b) condensation polymerizing the mixed diacid an equal molar amount of said diol as defined in claim 1.

### Claim 3 (depends on 1)

A polyester-imide according to claim 1 wherein
(a) is isophthalic acid,
(b) is (b.sub.2), and
(c) is bisphenol A.

### Claim 4 (depends on 1)

A polyester-imide according to claim 1 wherein
(a) is terephthalic acid,
(b) is (b.sub.3), and
(c) is (c.sub.2) with a mixing molar ratio of 1:1.

### Claim 5 (depends on 1)

A polyester-imide according to claim 1 wherein
(a) is terephthalic acid,
(b) is (b.sub.1), and
(c) is bisphenol A.

### Claim 6 (depends on 1)

A polyester-imide as defined in claim 1 consisting essentially of about 0.5 moles of N-(m-carboxyphenyl) trimellitimide, about 0.5 moles of terephthalic acid or isphthalic acid about 1 mole of bisphenol A or a mixture of hydroquinone and resorcinol.

### Claim 7 (depends on 1)

A polyester-imide as defined in claim 1 consisting of about 1 mole of N-(m-carboxyphenyl) trimellitimide or N-(p-carboxyphenyl) trimellitimide and about 1 mole of bisphenol A or a mixture of hydroquinone and resorcinol.

### Claim 8

An amide and phenol series solvents soluble polyester-imide, having a carboxy to hydroxy equivalent molar ratio of 0.9:1 to 1.1:1 produced from and consisting of:
(a) aromatic diacid selected from the group consisting of
(a.sub.1) terephthalic acid(TPA),
(a.sub.2) isophthalic acid(IPA), and mixture thereof, and having a ratio of TPA:IPA of 1:0 to 0:1 and comprising 0-49 molar percent of the total ingredients;
(b) an imide diacid selected from the group consisting of
(b.sub.1) a diimide diacid having the formula as follows: ##STR8## wherein x is selected from the group consisting of O, S, SO.sub.2, CO, and CH.sub.2,
(b.sub.2) a monoimide having the formula as follows: ##STR9## and (b.sub.3) a monoimide having the formula as follows: ##STR10## and mixtures thereof, and comprising 1-50 molar percent of the total ingredients; and
(c) aryl diol selected from the group consisting of
(c.sub.1) having the formula as follows: ##STR11## wherein Y is selected from the group consisting of C(CH.sub.3).sub.2, SO.sub.2, and S, and
(c.sub.2) a mixture of hydroquinone(HQ) and resorcinol(RC) with a mixing molar ratio of 1:0 to 1:1,
and comprising 50 molar percent of the total ingredients.