Cross-linked urea-formaldehyde polymer matrix compositions containing cyclic intermediate structures
US4429075A · kind A · utility
6Cited by
5References
21Claims
0Family size
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Inventor
Key dates
| Filing date | May 17, 1982 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | May 17, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A cross-linked urea-formaldehyde polymer matrix is formed by catalyzing, using a buffered acid as the catalyst, an aqueous mixture of a urea-formaldehyde concentrate, urea-formaldehyde resin, and powdered urea. The resulting thermoset polymer which possesses, in part, a cyclic structure, is of unusual hardness and has utility, with or without fillers, as a molding or casting material possessing controllable shrinkage characteristics because of uniform molecular structure and formula versatility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.