# US 4,396,746 A · Thermoplastic polyester copolymer

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- Number: US 4,396,746 A
- Document ID: US4396746A
- Status: Granted
- Kind: A
- Application number: 06/365,949
- Filed: 1982-04-06
- Granted: 1983-08-02
- Earliest claimed: 1981-04-16
- Assignees: Daicel Chemical Industries, Ltd.
- Inventors: Yuzo Toga
- Web page: https://patentgrep.com/patent/US4396746A

## CPC

- C08G 63/668: derived from polycarboxylic acids and polyhydroxy compounds
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A thermoplastic polyester copolymer comprises units derived from (A) terephthalic acid, a diol mixture of (B-1) 60 to 95 mol % of 2-methyl-1,3-propanediol and 5 to 40 mol % of 1,4-cyclohexanedimethanol, or (B-2) 5 to 95 mol % of 2-methyl-1,3-propanediol and 5 to 95 mol % of tetramethyleneglycol, and (C) 5 to 50 wt. %, based on the copolymer, of a polyalkylene ether glycol phthalate having a number-average molecular weight of 500 to 3000 in the polyalkylene ether glycol block thereof.

## Claims

### Claim 1

A thermoplastic polyester copolymer which comprises polyester recurring unis prepared by reacting
(A) a dicarboxylic acid component consisting essentially of 50 to 100 mol % of terephthalic acid or lower alkylester thereof and 0 to 50 mol % of isophthalic acid or lower alkyl ester thereof, and (B) a diol component selected from the group consisting of
(B-1) a mixture consisting essentially of 60 to 95 mol % of 2-methyl-1,3-propanediol and 5 to 40 mol % of 1,4-cyclohexane dimethanol, and
(B-2) a mixture consisting essentially of 5 to 95 mol % of 2-methyl-1,3-propanediol and 5 to 95 mol % of tetramethylene glycol, and polyether recurring units prepared by reacting said dicarboxylic acid component (A) with (C) a polyalkylene ether glycol having a number-average molecular weight of 500 to 3000, wherein the amount of said polyether recurring units is from 5 to 50 wt. %, based on the sum of the weights of said polyester recurring units and said polyether recurring units.

### Claim 2 (depends on 1)

A copolymer as claimed in claim 1 wherein said diol component (B) consists of (B-1).

### Claim 3 (depends on 1)

A copolymer as claimed in claim 1 wherein said diol component (B) consists of (B-2).

### Claim 4

A thermoplastic polyester copolymer consisting essentially of irregularly distributed recurring units A, B, C, D, E and F having the formulas: ##STR3## wherein R is alkyl having 2 to 6 carbon atoms and n is a positive integer such that -RO).sub.n has a molecular weight of 500-3000, and wherein the mole percent ratio of (A+B+C)/(D+E+F)=50-100/0-50, the mole percent ratio of (A+D)/(B+E)=60-95/5-40 and the weight of (C+F) is from 5 to 50% of the weight of (A+B+C+D+E+F).

### Claim 5

A thermoplastic polyester copolymer consisting essentially of irregularly distributed recurring units A, B, C, D, E and F having the formulas: ##STR4## wherein R is alkyl having 2 to 6 carbon atoms and n is a positive integer such that -RO).sub.n has a molecular weight of 500-3000, and wherein the mole percent ratio of (A+B+C)/(D+E+F)=50-100/0-50, the mole percent ratio of (A+D)/(B+E)=5-95/5-95 and the weight of (C+F) is from 5 to 50% of the weight of (A+B+C+D+E+F).

### Claim 6 (depends on 2)

A copolymer as claimed in claim 2, wherein said component (A) contains up to 30 mol % of said isophthalic acid or lower alkyl ester thereof, said mixture (B-1) contains 10 to 30 mol % of said 1,4-cyclohexanedimethanol and the balance is said 2-methyl-1,3 propanediol, and the amount of said polyether recurring units is 10 to 40 wt. %, based on the sum of the weights of said polyester recurring units and said polyether recurring units.

### Claim 7 (depends on 3)

A copolymer as claimed in claim 3, wherein said component (A) contains up to 30 mol % of said isophthalic acid or lower alkyl ester thereof, said mixture (B-2) contains 10 to 70 mol % of said 2-methyl-1,3-propanediol and 90 to 30 mol % of said tetramethylene glycol, and the amount of said polyether recurring units is 10 to 40 wt. %, based on the sum of the weights of said polyester recurring units and said polyether recurring units.

### Claim 8 (depends on 1)

A copolymer as claimed in claim 1, wherein said polyalkylene ether glycol (C) has a number-average molecular weight of 800 to 2000.

### Claim 9 (depends on 1)

A copolymer as claimed in claim 1, wherein said polyalkylene ether glycol is selected from the group consisting of polyethylene glycol, poly(1,2-propylene oxide) glycol, poly(1,3-propylene oxide glycol, poly(tetramethylene oxide) glycol, poly(hexamethylene oxide) glycol and copolymers thereof.