Catalyst mixtures for polyisocyanurate foam
US4710521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1986 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Jul 25, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249953
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Rigid polyisocyanurate foams are prepared by (a) bringing together on a continuously advancing conveyor an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent and, in an organic solvent, a catalyst mixture comprising: (i) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, and (ii) a tertiary amine, the amount of the salt of the low molecular weight carboxylic acid being sufficient and the molecular weight of the carboxylic acid of the salt being sufficiently low to provide a firm foam having a non-friable surface, and (b) foaming the foam-forming mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.