US 5459231
DRAWABLE HIGH TENSILE STRENGTH ARAMIDS
Assignee
E.I. DU PONT DE NEMOURS AND COMPANY A CORP. OF DELAWARE
Filed
Feb 27, 1991
Granted
Oct 17, 1995
Location
WILMINGTON DE US
Abstract
Aramids which after drawing have high tensile strengths and tensile moduli are made from units derived from selected 2,2'-disubstituted-4,4'-diaminobiphenyls, p-phenylenediamine, oxydianiline and terephthalic acid. Also disclosed is a process for drawing such aramids at least 1.5%, which results in the drawn aramid having significant crystallinity and higher tensile strength. The aramids are useful for ropes and composites.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 20, 1991
Rescinded
Apr 5, 1993
Duration
2 years
Inventor
- 1ROBERT S. IRWIN
Record Details
- Patent number
- US 5459231
- Application
- 07662197
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
Browse by Assignee
E.I. DU PONT DE NEMOURS AND COMPANY A CORP. OF DELAWAREBack to patent indexSource: USPTO 35 USC §181 secrecy order records