# US 5,346,969 A · Polyimide polymeric blends

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- Number: US 5,346,969 A
- Document ID: US5346969A
- Status: Granted
- Kind: A
- Application number: 07/996,256
- Filed: 1992-12-23
- Granted: 1994-09-13
- Earliest claimed: 1992-12-23
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Mureo Kaku
- Web page: https://patentgrep.com/patent/US5346969A

## CPC

- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- 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 77/12: Polyester-amides
- C08L 79/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Polymeric blends of polyimide precursor resins and polyamides or polyesters, preferably in the form of liquid crystal polymers, provide polyimide products with excellent physical characteristics and injection molding capability.

## Claims

### Claim 1

A particulate polymeric blend of
(a) about from 99 to 20% by weight of at least one polyamide which is melt processible at a temperature of less than about 400.degree. C. and, complementally,
(b) about from 1 to 80% by weight of polyimide precursor resin prepared from at least one aromatic diamine and at least one aromatic dianhydride in which less than about 98% of the polymeric units are converted to polyimide.

### Claim 2 (depends on 1)

A polymeric blend of claim 1 wherein the polyamide is a liquid crystal polymer.

### Claim 3 (depends on 1)

A polymeric blend of claim 1 wherein less than about 85% of the polymeric units in the polyimide precursor resin are converted to polyimide.

### Claim 4 (depends on 3)

A polymeric blend of claim 3 wherein less than about 40% of the polymeric units in the polyimide presursor resin are converted to polyimide.

### Claim 5 (depends on 1)

A polymeric blend of claim 1 further comprising at least about 1%, by weight of the polymeric blend, of filler.

### Claim 6 (depends on 5)

A polymeric blend of claim 5 wherein the filler is in particulate form.

### Claim 7 (depends on 6)

A polymeric blend of claim 6 wherein the filler consists essentially of graphite.

### Claim 8 (depends on 1)

A polymeric blend of claim 1 wherein the polyimide precursor resin is the reaction product of pyromellitic dianhydride and oxydianiline.

### Claim 9 (depends on 1)

A polymeric blend of claim 1 which has been heat treated at an elevated temperature for a period of about 2-24 hours.

### Claim 10 (depends on 5)

A polymeric blend of claim 5 wherein the filler consists essentially of polytetrafluoroethylene.

### Claim 11 (depends on 5)

A polymeric blend of claim 5 which has been heat treated at an elevated temperature for a period of about 2-24 hours.