US 5151489
COPOLYMERS CONTAINING POLYBENZOXAZOLE, POLYBENZOTHIAZOLE AND POLYBENZIMIDAZOLE MOIETIES
Assignee
DOW CHEMICAL COMPANY, THE, A CORP. OF DE
Filed
Sep 15, 1989
Granted
Sep 29, 1992
Location
MIDLAND MI US
Abstract
Block copolymers can be formed from heterocyclic polymers such as PBO and thermoplastic polymers such as polyamide or poly(aromatic ether ketone). The block copolymer compositions are thermoplastic and do not experience substantial phase separation, even at about their glass transition temperature. The block copolymer compositions can be formed into fibers, films and laminate or compression-molded articles. PBO, PBI and PBT polymers terminated by active aromatic rings or acylating groups are particularly useful for making the block copolymers.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jun 25, 1990
Rescinded
Dec 12, 1990
Duration
5 months
Inventor
- 1WILLIAM J. HARRIS
Record Details
- Patent number
- US 5151489
- Application
- 07407973
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
Browse by Assignee
DOW CHEMICAL COMPANY, THE, A CORP. OF DEBack to patent indexSource: USPTO 35 USC §181 secrecy order records