Process for making visco-elastic foams, polyols blend and reaction system useful therefor
US6617369B2 · kind B2 · utility
71Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Apr 12, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a one-shot or prepolymer process for preparing a visco-elastic polyurethane foam by reacting a polyisocyanate composition with a polyol composition comprising b1) an EO-rich polyol; b2) a polyol with an EO content between 20-50% and a primary hydroxy content of at least 50%; b3) a polyol with an EO content between 10-20% and a primary hydroxy content of at least 50%; and b4) a polyalkyleneglycol; according to the following proportions: b1: 30-85 wt %, b2: 5-65 wt %, b3: 5-40 wt %, b4: 0-50 wt %.The invention also relates to reaction systems comprising the above components and to the polyol composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.