Rhone-Poulenc Chimie

L'oreal

Rhone-Poulenc Specialites Chimiques

Francois Chizat

Claude Dubief

Jean F Grollier

Michel Peignier

Andre Soldat

Pierre Baule

Bernard Chaussabel

Unique silicone adhesion modifiers well suited for formulation into curable release compositions containing a linear polydiorganosiloxane, comprise an organopolysiloxane resin (A) containing at least 0.1 mol % of alkenyl or alkenyloxyalkylene radicals directly bonded to silicon atoms, an organopolysiloxane resin (B) containing at least 0.5 mol % of hydrogen atoms directly bonded to silicon atoms, and a solvent/diluent (C) for the resins (A) and (B).

Curable release compositions comprising novel silicone adhesion modifier

The invention relates to a silicon/water emulsion comprising, in an aqueous medium:

Emulsions of organopolysiloxanes containing a diester functional group,

Diorganopolysiloxanes containing itaconate functional groups include at least one recurring structural unit of the formula (1): ##EQU1## in which a is 1 or 2; the symbol Z is one of the radicals --CH.sub.2 CH(COOR')CH.sub.2 COOR' and --C(CH.sub.3)(COOR')CH.sub.2 COOR'; the symbols R, which may be identical or different, are each a C.sub.1 -C.sub.20 alkyl, vinyl, phenyl or 3,3,3-trifluoropropyl radical, and, in the case where a=2, one of the radicals R may be a hydroxyl group; and the symbols R', which may be identical or different, are each a C.sub.1 -C.sub.12 monovalent hydrocarbon radical or a C.sub.2 -C.sub.12 monovalent alkoxyalkyl radical, and are useful, e.g., as PVC lubricants and hydraulic fluids; they are facilely prepared by hydrolysis/polycondensation or by hydrosilylation.

Diorganopolysiloxanes containing itaconate functional groups

The oximinosilanes, e.g., methyltris(methyl ethyl ketoximo)silane and vinyltris(methyl ethyl ketoximo)silane, are improvedly produced by continuously charging a halogenated silane, an oxime, ammonia gas and an organic solvent medium into a stirred reaction zone, removing precipitated ammonium halide from the medium of reaction), and recovering product oximinosilane from the organic solvent phase, e.g., by distillation.

Production of oximinosilanes

Noncrystallizable single-component organopolysiloxane compositions which are storage-stable in the absence of water, curable into elastomers at ambient temperatures and above in the presence of water, and which are well adopted for the production of silicone coatings and seals, include:

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Francois Chizat