Polyurethane-modified polyisocyanurate foam and a method for the preparation thereof
US3931065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1967 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Feb 13, 1987 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to polyurethane-modified polyisocyanurate foam having excellent flame-resistivity and non-combustibility, which is prepared from (A) at least one aromatic polyisocyanates having no ortho-substituent, (B) at least one polyhydroxyl and/or polycarboxyl compound, (C) at least one foaming agent and (D) at least one catalyst used for the trimerization of isocyanate groups. The proportions of these components satisfy the relationships: (1) the equivalent ratio, Ae/(Be+Ce+De), is more than two, and (2) the weight ratio, Bw/Aw is less than 0.4 and more than zero, wherein A, B, C and D represent the above mentioned components respectively, e represents the number of chemical equivalents, w represents the weight of the components and the factors and Ce and De are eliminated from the relationships when components C and D do not react with the component A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.