Cyclic urea-formaldehyde prepolymer for use in phenol-formaldehyde and melamine-formaldehyde resin-based binders
US6245438A · kind A · utility
8Cited by
30References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2000 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Jun 22, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31957
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The preparation of phenol-formaldehyde and melamine-formaldehyde resin-based binders extended with a cyclic urea-formaldehyde prepolymer and to products prepared using the binders. More particularly, the invention relates to a cyclic urea prepolymer comprising urea, formaldehyde, and ammonia or a primary amine which, when added to a phenol-formaldehyde or melamine-formaldehyde based resin, results in a useful binder for the manufacturer numerous articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.