Liquid carbodiimide- and uretonimine-isocyanurate-containing polyisocyanate compositions and microcellular foams made therefrom
US4284730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1980 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Feb 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to carbodiimide- and/or uretonimine-isocyanurate-containing polyisocyanates, to the process for their preparation, and to microcellular foams prepared therefrom. These compositions may be prepared in the presence of the appropriate catalyst by PA0 (a) a partial trimerization of a mixture of polyisocyanate and carbodiimide and uretonimine containing polyisocyanate with trimer catalyst to the desired free isocyanate level, PA0 (b) sequential, partial carbodiimidization followed by partial trimerization of a polyisocyanate to the desired free isocyanate level PA0 (c) sequential partial trimerization of a polyisocyanate followed by partial carbodiimidization, PA0 (d) simultaneous conversion using the mixed catalyst system of carbodiimide and isocyanurate catalysts reacted to the desired free isocyanate level, and PA0 (e) blending liquid polyisocyanate with the carbodiimide and uretonimine containing polyisocyanate and isocyanurate containing polyisocyanate to the desired isocyanate level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.