Process for making urethane-isocyanates
US9816008B2 · kind B2 · utility
3Cited by
9References
14Claims
0Family size
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Key dates
| Filing date | Mar 21, 2014 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Aug 19, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2261/60
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyisocyanurate or polyurethane-isocyanurate polymers are made by curing an aromatic polyisocyanate or a mixture of at least one aromatic polyisocyanate and at least one polyol having a hydroxyl equivalent weight of up to 200 in which the isocyanate index is at least 2.00, in the presence of at least one isocyanate trimerization catalyst, to form a polyisocyanurate or polyurethane-isocyanurate polymer having a glass transition temperature of at least 100° C., and then exposing the polyisocyanurate or polyurethane-isocyanurate polymer formed step a) to water under superatmospheric pressure at a temperature of at least 70° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.