Catalyst for low temperature cure of blocked isocyanates
US5770672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/80
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention comprises a polystannoxane catalyst, a curable composition containing the catalyst and a method of using the catalyst and curing the composition. The curable composition comprises: PA1 (i) a blocked isocyanate; PA1 (ii) a functional component containing reactive hydrogen; PA1 (iii) a polystannoxane catalyst for promoting the reaction of the blocked isocyanate with the functional component. A co-catalyst may also be employed based on Cu, Zn, Ni, Zr, Ce, Fe, Co, V, Sb and Bi and especially oxides, salts or chelates of said metals. The invention also relates to a method for curing a blocked isocyanate at a low reaction temperature which comprises combining the catalyst with the blocked isocyanate and functional component and heating to a temperature less than about 180.degree. C. to obtain a cured urethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.