Toughened, glass filled polyamide compositions and blends having improved stiffness, and articles made therefrom

• US 20040087706A1
• Filed: 09/04/2003
• Published: 05/06/2004
• Est. Priority Date: 09/06/2002
• Status: Active Grant

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Lee, Win-Chung, Fish, Robert B. Jr.
• Granted Patent: US 7,138,454 B2
• Time in Patent Office: Days
• US Class Current: 524/494
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 29/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 29/14 Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
• CPC Class Codes: 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
• CPC Class Codes: C08L 77/02 Polyamides derived from omega-amino carboxylic acids or from lactams thereof C08L77/10 takes precedence
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence

Abstract

Polyamide compositions and blends toughened with polyvinylbutyral and containing glass fiber are disclosed, together with articles of manufacture. These materials may also contain non-reactive polymers and antioxidants.

Claims

1. A thermoplastic polyamide composition comprising:

A. 5 to 30 weight percent free-flowing toughener comprising about 20 weight percent to about 95 weight percent polyvinylbutyral (PVB);

B. 10 to 45 weight percent glass fiber; and

C. complimentally, 85 to 25 weight percent polyamide having a melting point below about 230°

C. and a number average molecular weight of at least 5,000.

2. The composition of claim 1 wherein said PVB of said toughener (A) is selected from the group consisting of PVB, virgin plasticized PVB, scrap PVB, edge trim PVB, and mixtures thereof.

3. The composition of claim 1 wherein said toughener (A) further comprises one or more polymers having anhydride functionality and/or one or more polymers having carboxylic acid functionality.

4. The composition of claim 1 wherein said toughener (A) further comprises a non-reactive polymer.

5. The composition of claim 4 wherein said non-reactive polymer is selected from the group consisting of polyethylene, polypropylene, polyvinylchloride, nylon, olefinic copolymers, and mixtures thereof.

6. The composition of claim 1 further comprising at least 0.1 weight percent of an antioxidant.

7. A molded article made from the composition of claim 1.