Aqueous dispersions based on viscous silicone oils capable of cr

Details Aqueous dispersions based on viscous silicone oils capable of cr Aqueous dispersions based on viscous silicone oils capable of cr

1997-03-21

1998-12-22

Glass, Margaret W.

Coating processes

With post-treatment of coating or coating material

Heating or drying

523322, 528837, B05D 500

Patent

active

058515941

ABSTRACT:
Aqueous dispersions containing: a silicone oil (A) which is cross-linkable by condensation, optionally in the presence of a cross-linking agent (B), into an elastomer; optionally a cross-linking agent (B), a silane (C) and a mineral filler (D); and a catalytic amount of a hardening compound (E). Said dispersions are characterized in that they are produced by kneading a mixture of (1) a silicone phase (F) with a viscosity of at least 3 Pas, containing the oil (A) and optionally one or more of components (B), (C), (D) or (E), and 2) an aqueous phase comprising water and at least one surfactant (G), wherein the weight ratio water/water+surfactant(s) is such that the viscosity of the aqueous phase is preferably at least as high as that of the silicone phase (F); for a sufficient time and with sufficient shear to give an oil-in-water emulsion having a particle size of 0.1-5 micrometers; and optionally by diluting with water until a 25-97 % dry extract is obtained; followed by adding the component(s) not present in the silicone phase (F).

REFERENCES:
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patent: 5037878 (1991-08-01), Cerles et al.
patent: 5045231 (1991-09-01), Braun et al.
patent: 5140061 (1992-08-01), Feder
patent: 5145901 (1992-09-01), Feder
Grossmann et al. (1990) "Tensid-Taschenbuch" Carl Hanser Verlag Muchen Wien, pp. 14-15.
Dr. Otto-Albrecht Neumuller (1983) "Rompps Chemie-Lexikon" Franckh' sche Verlagshandlung Stuggart HMO-Theorie, p. 1715.
Gerhartz et al., Ullmann's Encyclopedia of Industrial Chemistry A9:297,325.

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