Process for molding an integral skin foam using an evacuated mold cavity
US5476619A · kind A · utility
10Cited by
18References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Apr 13, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for molding a semi-rigid integral skin foam which comprising an integral skin having a low degree of foaming and a core having a high degree of foaming. The process includes evacuating a mold cavity to a pressure of from above 50 to 700 Torr; injecting, into the evacuated mold cavity, a polyurethane material which contains a polyol component and an isocyanate component with air bubbles introduced therein by air loading, in the substantial absence of a foaming agent; and foaming the material to fill the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.