Hydrophobic polyurethane foams, their manufacture and use

Details Hydrophobic polyurethane foams, their manufacture and use Hydrophobic polyurethane foams, their manufacture and use

1979-04-30

1980-12-02

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

210 36, 210 39, 210 40, 405 60, 521157, 521905, C08G 1814

Patent

active

042372372

ABSTRACT:
Hydrophobic polyurethane foams which have densities of from 4 to 15 g/liter and in which the number of closed cells is from 2 to 30%, and the number of open cells from 98 to 70%, based on the total number of cells, are obtained from polyisocyanates, polyhydroxy compounds, catalysts and water, with or without lipophilic compounds, the components being reacted in such amounts that the ratio of hydrogen atoms capable of undergoing a Zerewitinoff reaction to NCO groups is from 1.3 to 10:1. The foams are suitable for the absorption of oil and/or by hydrophobic solvents, which may or may not contain halogen, from water.

REFERENCES:
patent: 3476933 (1969-11-01), Mendelsohn
patent: 3505250 (1970-04-01), Saunders
patent: 3567663 (1971-03-01), Triolo et al.
patent: 3617551 (1971-11-01), Johnston et al.
patent: 3681237 (1972-08-01), Orban et al.
patent: 3779908 (1973-12-01), Gregory
patent: 3852193 (1974-12-01), Jakubek et al.
patent: 3886067 (1975-05-01), Miranda
patent: 3888766 (1975-06-01), DeYoung
patent: 3917528 (1975-11-01), Orban et al.
patent: 3953406 (1976-04-01), Marsh
patent: 3959191 (1976-05-01), Kehr et al.

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