Process for preparing smoke-retardant polyisocyanurate foam
US4072636A · kind A · utility
7Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1976 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | Mar 3, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement is characterized in that the reaction is conducted in the presence of an organosilicate having the formula Si(OR).sub.4 or R.sub.n Si(OR').sub.4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1-12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.