Foaming system for closed-cell rigid polymer foam
US4997706A · kind A · utility
46Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1990 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Feb 9, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249976
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to the use of a C.sub.2-6 polyfluorocarbon compound containing no chlorine or bromine atoms as physical blowing agent in the preparation of rigid, closed-cell, polymer foams. Use of such blowing agents, especially 1,1,1,2-tetrafluoroethane (R-134a), in the preparation of polyurethane or polyisocyanurate foams provided for products in which the loss in thermal insulation performance with time compared to products prepared in absence of such blowing agents is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.