Phenol formaldehyde resin foams
US4219623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Jun 28, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2361/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A two component system, and method for its preparation, from which a phenol-formaldehyde resin foam may be prepared, which system comprises in a first component a phenol-formaldehyde resin, a blowing agent which is an inert, low boiling liquid, an effective amount of a nitrogenous modifier capable of permitting dispersion of the blowing agent in the resin, and a surfactant; and in a second component an acid catalyst system dispersed in a liquid polyhydroxy compound, in a weight ratio of acid catalyst to polyhydroxy compound of at least 1:1. These systems enable simpler handling and placement techniques being shelf storable, compared to the known shelf storable systems which involve three, or more, components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.