Resin transfer molding process
US5277862A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1993 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Jan 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6517
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to a process for preparing polyurethanes by reacting, in accordance with the resin transfer molding technique at an isocyanate index of about 80 to about 120, PA0 (a) an organic polyisocyanate; PA0 (b) about 60 to about 98 percent by weight, based on the total amount of components (b) and (c), of at least one isocyanate-reactive compound containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from about 400 to about 10,000; PA0 (c) about 2 to about 40 percent by weight, based on the total amount of components (b) and (c), of (i) 2-methyl-1,3-propanediol or (ii) a mixture of 2-methyl-1,3-propanediol with (1) up to about 30% by weight, based on the total amount of component (c), of a chain extender other than 2-methyl-1,3-propanediol and/or (2) up to about 5% by weight, based on the total amount of component (c), of a crosslinking agent; and PA0 (d) one or more catalysts and, optionally, one or more other auxiliaries and/or additives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.