Method for the preparation of highly absorbent phenolic resin foams
US4426462A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Jul 27, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2491/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improvement in the preparation of open-pored phenolic resin foams by the foaming of intimate mixtures of water-containing phenolic resol resins in the viscosity range of from 1000 to 20,000 cP, low-boiling organic liquids in which the phenolic resol resins are not soluble as blowing agents and acid-containing hardeners, the improvement comprising adding to the foamable phenolic resol resin before or during the preparation of the foamable mixture, 1.0 to 6.0 weight-percent of ethoxylated castor oil and 0.5 to 5 weight-percent of an alkyl sulfate salt of the general formula EQU C.sub.x H.sub.2x+1 --O--SO.sub.3 --Me.sup.+ wherein x an integer from 8 to 18 and Me is an alkali metal or a triethanolamine cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.