Continuous process for the manufacture of quick-setting phenolic foams
US4424289A · kind A · utility
4Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1982 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | May 14, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2361/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A continuous process for manufacturing quick-setting phenolic foams is improved by using as the hardening agent a concentrated, substantially anhydrous solution of boron trioxide, and using as the blowing agent an organic liquid having a boiling point of 20.degree.-80.degree. C. Curing times are shortened and the resultant foam, having uniformly molecularly dispersed therein about 0.25-10.5% by weight of boron, calculated as boric anhydride, has substantially uniform cells, improved fire resistance characteristics and superior mechanical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.