Polyisocyanate compositions containing in-situ formed pyrophosphate mold release agent and process of making
US4258169A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1980 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Mar 26, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2125/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is disclosed for the preparation of liquid, storage-stable, polyisocyanate compositions containing a release agent formed in situ which compositions are useful, for example, as binder resins in the formation of particle boards which latter, because of the presence of the release agent, show no tendency to adhere to the face of metal platens used in their formation. The process comprises heating an organic polyisocyanate (polymethylene polyphenyl polyisocyanate preferred) with an acid phosphate (e.g. a mixture of mono- and di-alkyl acid phosphates) under conditions controlled as to time and temperature so as to yield a product which is storage stable and shows no tendency to deposit solid or to separate into two liquid phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.