Boric anhydride solutions and their use as hardeners of resols
US4323667A · kind A · utility
7Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1981 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Jan 22, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31942
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Concentrated boric anhydride solutions containing more than 5% of boric anhydride in an organic solvent selected from mono or polyalcohols, trialkylborate and/or dialkylacetal when the solvent also contains an acid selected from sulfuric acid and/or aromatic acids. These solutions are used as hardeners of formo-phenolic resols, more particularly for the manufacture of laminates comprising glass fibers and formo-phenolic resols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.