Foaming system for closed-cell rigid polymer foam

Details Foaming system for closed-cell rigid polymer foam Foaming system for closed-cell rigid polymer foam

1990-02-09

1991-03-05

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283055, 4283144, 521131, 521902, B32B 326

Patent

active

049977067

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.

REFERENCES:
patent: 3911190 (1975-10-01), Myers et al.
patent: 4133931 (1979-01-01), Beale et al.
patent: 4351873 (1982-09-01), Davis
patent: 4795763 (1989-01-01), Gluck et al.

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