Method of frothing aqueous ionic polyurethane dispersions and pr

Details Method of frothing aqueous ionic polyurethane dispersions and pr Method of frothing aqueous ionic polyurethane dispersions and pr

1986-03-11

1987-09-01

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 72, 521 90, 521 93, 521156, 524 86, 524322, 524394, 524399, 524400, 524718, 524724, C08G 1814

Patent

active

046909532

ABSTRACT:
A method of mechanically frothing and casting an aqueous ionic polyurethane dispersion to yield a mechanically frothed polyurethane foam. The method comprises admixing an aqueous ionic polyurethane dispersion with a stearate stabilizer and an optional aziridine crosslinking agent, and frothing the low viscosity admixture. The polyurethane dispersion contains particles having an average size of less than one micron, and contains between 35 and 70 percent by weight dispersed polyurethane solids. Preferably, each polyurethane particle in the aqueous dispersion is crosslinked. Before frothing, the low viscosity admixture contains between 33 and 87 percent by weight of the polyurethane dispersion, up to 33 percent by weight of an azirdine composition and between 13 and 50 percent by weight of a 33 percent aqueous dispersion of a stearate salt and has, as a result, a viscosity in the range of 100 to 200 centipoise. After frothing, the frothed admixture is knife-coated and cured into a flexible foam sheet.

REFERENCES:
patent: 3461103 (1969-08-01), Keberle
patent: 3479310 (1969-11-01), Dieterick et al.
patent: 4029534 (1977-06-01), Bocks et al.
patent: 4171391 (1979-10-01), Parker
patent: 4296174 (1981-10-01), Hanzel et al.
patent: 4554308 (1985-11-01), Russiello

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