# US 5,705,575 A · Copolyester composition

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- Number: US 5,705,575 A
- Document ID: US5705575A
- Status: Granted
- Kind: A
- Application number: 08/725,270
- Filed: 1996-10-02
- Granted: 1998-01-06
- Earliest claimed: 1995-05-31
- Assignees: Shell Oil Company
- Inventors: Donald Ross Kelsey
- Web page: https://patentgrep.com/patent/US5705575A

## CPC

- C08G 63/199: Acids or hydroxy compounds containing cycloaliphatic rings
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

According to the invention, an amorphous copolyester is prepared by contacting, under polymerization conditions an aromatic dicarboxylic acid or ester or anhydride thereof, a 2,2,4,4-tetraalkyl-1,3-cyclobutanediol and 1,3-propanediol or 1,4-butanediol. The resulting copolyester exhibits superior thermal and impact properties.

## Claims

### Claim 1

An amorphous polymeric composition having an intrinsic viscosity of at least about 0.5 a notched Izod greater than 3 ft-lb/in and a glass transition temperature greater than 100.degree. C. which composition is the product of contacting monomers comprising (a) at least one aromatic dicarboxylic acid or an alkyl ester or anhydride thereof; (b) about 40 to about 90 mole percent based on moles of components (b) and (c) of at least one 2,2,4,4-tetraalkyl-1,3-cyclobutanediol having a cis:trans ratio within the range of about 33:67 to about 67:33; and (c) at least one of 1,3-propanediol and 1,4-butanediol, under polycondensation reaction conditions in the presence of a polycondensation reaction conditions in the presence of a polycondensation catalyst.

### Claim 2 (depends on 1)

The composition of claim 1 in which component (a) is selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalene dicarboxylic acid, dimethyl terephthalate, diethyl terephthalate, dipropyl terephthalate, dimethyl isophthalate, diethyl isophthalate, dipropyl isophthalate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, phthalic anhydride, dimethyl 2,6-naphthalene dicarboxylate and diethyl 2,6-naphthalene dicarboxylate.

### Claim 3 (depends on 1)

The composition of claim 1 in which the 2,2,4,4-tetraalkyl-1,3-cyclobutanediol is 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

### Claim 4 (depends on 3)

The composition of claim 3 in which the molar ratio of component (b) to component (c) is within the range of about 45:55 to about 85:15.

### Claim 5 (depends on 1)

The composition of claim 1 in which the polycondensation catalyst is a tin compound.

### Claim 6 (depends on 1)

The composition of claim 1 having a yellowness index value (ASTM D-1925) less than about 50.

### Claim 7 (depends on 1)

The composition of claim 1 having a yellowness index (ASTM D-1925) less than about 20.

### Claim 8 (depends on 1)

The composition of claim 1 in which component (a) is dimethyl terephthalate, component (b) is 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and component (c) is 1,3-propanediol.

### Claim 9 (depends on 1)

The composition of claim 1 in which component (b) has a cis:trans isomer ratio within the range of about 40:60 to about 60:40.

### Claim 10 (depends on 1)

The composition of claim 1 having an intrinsic viscosity (in hexafluoroisopropanol at room temperature) within the range of about 0.6 to about 1.0.

### Claim 11 (depends on 1)

A blend of the amorphous polyester of claim 1 and at least one of poly(ethylene terephthalate) and poly(trimethylene terephthalate) .

### Claim 12

An amorphous copolyester composition having randomly-distributed units of the structural formulas ##STR2## in which the ratio of the number of units of I to the number of units of II is within the range of about 40:60 to about 90:10 and R is 1,3-trimethylene or 1,4-tetramethylene, said composition having a notched Izod greater than 3 ft-lb/in and a glass transition temperature greater than 100.degree. C.