Method of preparing a stable, low pH phenolic resin
US6806343B2 · kind B2 · utility
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39References
20Claims
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Key dates
| Filing date | May 31, 2002 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | May 31, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31601
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A phenol-formaldehyde resole resin for use as a binder for glass fibers is acidified to a pH of 3 or less after base-catalyzed resinification. An increase in actual solids is observed compared with neutralized resin. Phenol-formaldehyde-urea-ammonia resins are surprisingly stable at pH 3 with desirable cure profiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.