Substantially closed-cell rigid foams containing urethane, urea

Details Substantially closed-cell rigid foams containing urethane, urea Substantially closed-cell rigid foams containing urethane, urea

1991-03-01

1991-12-03

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521174, C08G 1814

Patent

active

050701150

ABSTRACT:
Rigid substantially closed cell foams are made by reacting an organic isocyanate with a mixture of high molecular weight polyols in the presence of water, a catalyst and other optional materials such as chain extenders, crosslinking agents and flameproofing agents. The reactants are used in quantities such that the isocyanate to hydroxyl group index is from about 90 to about 150. The mixture of high molecular weight polyols is composed of (1) a polyester having at least two hydroxyl groups and an OH number greater than 150 and/or a polyether having at least two hydroxyl groups and an OH number greater than 200 and (2) a polyether having at least two hydroxyl groups and an OH number below 100. The foams produced in accordance with this process are useful as insulating materials and as structural reinforcing materials.

REFERENCES:
patent: 4897431 (1990-01-01), Scherzer et al.

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