# US 5,346,970 A · Blend of polyethylene terephthalate matrix and thermotropic liquid crystal block copolymer

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- Number: US 5,346,970 A
- Document ID: US5346970A
- Status: Granted
- Kind: A
- Application number: 08/096,756
- Filed: 1993-07-22
- Granted: 1994-09-13
- Earliest claimed: 1991-12-23
- Assignees: Akzo Nobel N.V.
- Inventors: Sophia Dashevsky; Ki-Soo Kim; Stanley W. Palmaka; Roy L. Johnston; Leonardus A. G. Busscher; Johannes A. Juijn
- Web page: https://patentgrep.com/patent/US5346970A

## CPC

- C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Blends of a poly(ethylene terephthalate) matrix and a thermotropic liquid crystalline segmented block copolymer comprising rod (e.g., aromatic ester mesogen units containing flexible alkylene spacers) and flexible coil polymer blocks of poly(butylene terephthalate) can be used as molding compositions or in the formation of fibers and films.

## Claims

### Claim 1

A blend of (1) a flexible coil polymer matrix of poly(ethylene terephthalate) and (2) a thermotropic liquid crystalline segmented block copolymer which comprises rod and flexible coil polymer blocks, the rod blocks being main chain, containing a flexible spacer, and being of the formula
--[--OArC(O)O(CH.sub.2).sub.n OC(O)ArOC(O)ArC(O)--]--.sub.x
where Ar represents phenyl with para- bond sites, n can range from 2 to 10, and x can range from about 2 to about 50, the flexible coil blocks being of poly(butylene terephthalate).

### Claim 2 (depends on 1)

A blend as claimed in claim 1 wherein the amount of block copolymer in the matrix ranges from about 0.5% to about 99% by weight of the matrix.

### Claim 3 (depends on 1)

A blend as claimed in claim 1 wherein the amount of block copolymer in the matrix ranges from about 1% to about 35% by weight of the matrix.

### Claim 4 (depends on 1)

A blend as claimed in claim 1 where n is 4.

### Claim 5 (depends on 1)

Fibers made from the blend of claim 1.

### Claim 6 (depends on 2)

Fibers made from the blend of claim 2.

### Claim 7 (depends on 3)

Fibers made from the blend of claim 3.

### Claim 8 (depends on 4)

Fibers made from the blend of claim 4.