Dimensionally stable closed cell rigid polyisocyanate based foam

Details Dimensionally stable closed cell rigid polyisocyanate based foam Dimensionally stable closed cell rigid polyisocyanate based foam

1995-06-16

1995-11-28

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521174, C08G 1848

Patent

active

054708915

ABSTRACT:
There is now provided a closed cell rigid polyisocyanate based foam blowing with a C.sub.1 -C.sub.4 hydrofluorocarbon and water as blowing agents, which possesses a uniform density gradient varying by not more than 10 percent. There is also now provided a froth foaming mixture having good flow by employing a hydroxy terminated polyol which is pH neutral and a tertiary amine ether blow catalyst in an amount of 0.5 weight percent or more, using water and a C.sub.1 -C.sub.4 hydrofluorocarbon having a boiling point of 300 K or less as co-blowing agents.
There is also provided a polyol composition having an average OH number of less than 400 and an average functionality of greater than 4, which when reacted with the isocyanate in the presence of a C.sub.1 -C.sub.4 hydrofluorocarbon, yields a rigid closed cell polyisocyanate based dimensionally stable foam.
The formulation according to an especially preferred embodiment of the invention simultaneously satisfies the following requirements:
1) a formulated polyol composition having a viscosity of 550 cP or less;
2) the isocyanate stream and the formulated polyol stream dispensable at a 0.9:1 to 1.3:1 weight ratio, respectively;
3) frothing when dispensed from a static mixer;
4) produces a frothing foaming mixture having excellent flow characteristics as demonstrated by a substantially uniform density gradient;
5) and produces a dimensionally stable closed cell foam having a low overall density of 2.5 pcf or less.

REFERENCES:
patent: 3541023 (1970-11-01), Cole
patent: 3769232 (1973-10-01), Houldridge
patent: 4945119 (1990-07-01), Smits et al.
patent: 4972003 (1990-11-01), Grunbaner et al.
patent: 4997706 (1991-03-01), Smits et al.
patent: 5100922 (1992-03-01), Wada et al.

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