Stable particulate dispersions

Details Stable particulate dispersions Stable particulate dispersions

1997-06-16

1998-05-19

Foelak, Morton

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

252309, 252351, 521112, 524837, C08K 554, B01J 1300, C08J 900

Patent

active

057537356

ABSTRACT:
A composition comprising a particulate dispersion of from 50% to 98.9% by weight of a siloxane-polyoxyalkylene copolymer surfactant, from 1% to 49.9% by weight of a nonionic organic surfactant other than the siloxane-polyoxyalkylene copolymer surfactant and from 0.1% to 25% by weight, based on the total weight of the composition, of a particulate material having a particle size of less than 20 microns, is described. A method of preparing such a composition, and polyurethane and polyisocyanurate foams containing such a composition are also described. The nonionic organic surfactant is preferably an ethoxylated nonylphenol. The particulate material is preferably a hydrophobic precipitated silica. The composition of the invention is useful as an additive in the preparation of rigid polyurethane and polyisocyanurate foams.

REFERENCES:
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patent: 3980688 (1976-09-01), Litteral et al.
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patent: 5312848 (1994-05-01), Klapper et al.
M. Okoroafor, et al "Rigid Polyurethane Forms With Enhanced Thermal Insulation Performance", Polyurethanes 1995, Proceedings of the Polyurethanes 1995 Conference, pp. 303-309.

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