Patent · US Expired

Thermotropic liquid crystalline polymer reinforced with polyimide sized carbon fibers

US5401779A · kind A · utility

3Cited by
3References
40Claims
0Family size

Inventors

Key dates

Filing dateJan 14, 1983
Grant dateMar 28, 1995
Priority date—
Expiry dateJan 14, 2003

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K2019/521
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

A thermotropic liquid crystalline polymer matrix having sized carbon fibers incorporated therein for reinforcement. The carbon fibers are coated on their surface with a sizing composition comprising a rigid polyimide coating which is derived from the reaction of at least one aromatic diamine, at least one dianhydride, and at least one aromatic tetracarboxylic acid diester in which the carboxylic acid groups and ester groups are ortho disposed. By the use of appropriate amounts of heat and pressure, multifilamentary bundles of carbon fibers are readily impregnated with thermotropic liquid crystalline polymer to form a prepreg having a uniform distribution of carbon fiber throughout.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.