Method for making rigid polyisocyanurate foam

Details Method for making rigid polyisocyanurate foam Method for making rigid polyisocyanurate foam

1991-08-23

1992-03-10

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521902, C08J 900

Patent

active

050950428

ABSTRACT:
A rigid polyisocyanurate foam suitable for holding stems of artificial flowers is a substantially closed cell foam having a density of about 1.7 to 2.9 lb./cu. ft. The foam is made by mixing components A and B in a ratio of B:A of about 0.2 to 0.6. Component B is a mixture of 100 parts by weight of polyester or polyether polyol, 0.5 to 5 parts by weight of potassium octoate, 4 to 10 parts by weight of water and 0 to 8 parts by weight of green colorant. Component B is mixed with 250 to 500 parts by weight of polymeric diphenyl methane diisocyanate (component A), and the resulting mixture is poured onto a substrate, which may be a conveyor or a mold box, for foaming in a substantially free rise step with a cream time of about 5 to 20 seconds. The conveyor is preferably heated to about 100.degree. to 150.degree. F. The foam is cured before cutting.

REFERENCES:
patent: 4401769 (1983-08-01), Malawitz
patent: 4425446 (1984-01-01), Malawitz
patent: 4559370 (1985-12-01), Blampied
patent: 4565833 (1986-01-01), Buszard
patent: 4656200 (1987-04-01), Clubley et al.
patent: 4666967 (1987-05-01), Richardson
patent: 4880848 (1989-11-01), Ghali

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