Dimensionally-stable polyurethane sponge and sponge-forming prep

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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Details

521160, 521901, 521905, 521914, C08G 1814, C08G 1848, C08G 1879

Patent

active

043776450

ABSTRACT:
An MDI based polyurethane foam having cellulose foam properties is produced by mixing together an aqueous phase which can optionally contain reinforcing fibers and surfactants and a resin phase comprising a prepolymer derived from a poly(oxy C.sub.2-4 alkylene)diol, an MDI containing isocyanate product having a functionality greater than 2.0 made of a mixture of MDI and isocyanate containing derivatives of MDI, and a monomeric polyol cross-linking agent having 3 or 4 hydroxyl equivalents per mole. The preferred polyol is trimethylolpropane and the preferred diol is Carbowax 1000. The diol and the polyol, such as trimethylolpropane, are present in a mole ratio in the range of 4:1 to 8:1 while the ratio of the isocyanate equivalents to the total hydroxyl equivalents is in the range of 3:1 to 4:1. The isocyanate containing product comprises more than 50% by weight of the prepolymer and Isonate 143L is the preferred isocyanate product. The foam has a minimal swell when wet and it does not curl upon drying.

REFERENCES:
patent: 3806474 (1974-04-01), Blair
patent: 4102831 (1978-07-01), Osgood
patent: 4160076 (1979-07-01), Guthrie et al.
patent: 4201846 (1980-05-01), Kehr et al.
patent: 4292412 (1981-09-01), Wood
patent: 4309509 (1982-01-01), Wood
patent: 4314034 (1982-02-01), Fulmer et al.
The Upjohn Co., Tech. Service Report-Isonate 143L "Liquid MDI", Feb. 1980.
The Upjohn Co., Technical Information-"PAPI94".

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