Process for rim elastomers with superior high temperature dimensional stability
US4297444A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1980 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Feb 11, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2120/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention is a method for making reaction injection molded polyurethane of improved properties. The product ccomprises the reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate wherein at least about 30% of the high molecular weight polyether is first mixed and allowed to react with the polyisocyanate and then the remaining polyhydric polyether and low molecular weight active hydrogen containing compound are added to the polyether and polyisocyanate mixture and allowed to react. Reaction injection molded elastomers are useful as molded articles of commerce including, but not limited to, vehicle body parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.