Urea-formaldehyde resin manufacture
US4564667A · kind A · utility
8Cited by
5References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1985 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | Feb 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A solid urea-formaldehyde resin is provided, having a degree of condensation of 25% to 45%. A process for making the resin is also described and includes several steps. Urea and formaldehyde is first reacted with a molar ratio of U:F of 1:2.5 or more then concentrated. Further urea is added to reduce the ratio to the range 1:1.1 to 1:2 and further concentration is achieved without precipitation of solid resin by the use of a stabilization agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.