Polyamide fiber reinforcement in thermoset polyurethane composites
US4695509A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1985 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Dec 23, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2893
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Fiber-reinforced thermoset polyurethane composites display enhanced impact strength when sufficient amounts of a high tenacity aliphatic polyamide fiber characterized by a drawn denier of 4 to 8 denier per filament; a thermal shrinkage of up to about 14 percent; an elongation of from less than 28 percent; and a tenacity of at least 5.5, preferably at least 7 grams per denier, are incorporated into the composite. The process of producing such composites, including reinforced reaction injection molding processes, resin transfer molding processes, and casting process are improved by a reduction in equipment wear resulting from the incorporation of the specified polyamide fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.