Low smoke isocyanurate modified urethane foam and method of making same
US4417001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1982 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Sep 20, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/092
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Low smoke isocyanurate modified polyurethane foams are prepared from polyols and a stoichiometric excess of reactive isocyanates providing an --NCO/--OH index of 1.3-3.0, preferably from 1.6-2.3. Catalysts for the trimerization reaction of the isocyanate to the isocyanurate form are employed. The polyol used in the present invention includes from 5-100% of a digestion product which is prepared by digesting polyalkylene terephthalate residues in organic polyols. The foams produced by the method of the present invention possess unexpected properties in such areas as flame spread, smoke, and low friability. The use of the polyols described above can substantially reduce product cost, allowing the isocyanurate modified polyurethane foams of the present invention to be utilized in commercial applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.