Process for the preparation of polyurethane foams
US4977194A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Aug 11, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of polyurethane foams comprising reacting polyisocyanates with dispersions of (i) polymer-containing relatively high molecular weight hydroxyl compounds that are prepared by reaction of mono- or polyisocyanates with NH-containing compounds selected from the group consisting of polyamines containing primary and/or secondary amino groups, hydrazines, hydrazides, and alkanolamines in (ii) a compound containing 1 to about 8 primary and/or secondary hydroxyl groups and having a molecular weight of about 400 to about 16,000, in the presence of water and/or organic blowing agents; catalysts; and flameproofing agents comprising an expandable graphite modified by inorganic expandable materials, alone or in combination with inorganic co-flameproofing agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.