Cellular isocyanurate polymer
US4039487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Jan 19, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/903
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyisocyanurate foams are disclosed which are characterized by low Flame Spread Ratings and low smoke generation values, as determined by the Underwriter's Laboratory Tunnel Test in accordance with the ASTM E-84 test procedure. The smoke and flame resistant properties are achieved, not through the use of flame retardants or additives, but rather by the use of a minor amount of a hydroxyl terminated aromatic polyester having a hydroxyl equivalent weight from about 150 to about 500 and which is the product of the reaction of an excess of a polyethyleneglycol having an equivalent weight from about 75 to about 225, with an aromatic polycarboxylic compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.