Polyisocyanate compositions and foam comprising MDI, polymeric MDI, and a prepolymer of MDI
US4972004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyisocyanate composition comprising: PA1 (A) 30-45% by weight of disphenylmethane diisocyanates; PA1 (B) 28-67% by weight of polymethylene polyphenylene polyisocyanates having more than two free isocyanate groups in the molecule; and PA1 (C) 3-27% by weight of a prepolymer from a diphenylmethane diisocyanate and a compound containing at least two isocyanate-reactive groups and having a molecular weight below 1000; the % by weight being calculated on the total amount of (A), (B) and (C) present in the composition; the number average isocyanate functionality of the composition being at least 2.3. The compositions show improved miscibility with rigid foam polyols resulting in processing benefits. Foams made from these compositions exhibit smaller cell size and lower thermal conductivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.