Toughened prepregs and formulations
US5002821A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1987 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Dec 15, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/3545
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A prepreg formulation comprising prepreg fabric or filament fibers unidirectionally aligned and a toughened resin system comprising a thermosetting matrix resin and a small amount of a chromium (III) complex. In another embodiment, the invention includes the presence of thin surface layers of extremely fine fibers of a thermoformable polymer having at least one of a T.sub.m or T.sub.g greater than about 300.degree. C. or no T.sub.m or T.sub.g and a decomposition temperature greater than about 300.degree. C. In another embodiment, the invention includes the presence of inorganic fine fibers. The preferred matrix resin is a blend of a thermosetting epoxy resin and an amorphous thermoplastic polymer having a T.sub.g greater than about 195.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.