Wacker-chemie Gmbh

Wacker Chemie Ag

Willi Primas

Peter August

Peter Huber

Helga Lampelzammer

Wilhelm Marsch

Christof Woerner

Max Proschkowitz

Addition-crosslinkable silicone compositions contain

Addition-crosslinkable silicone compositions with low coefficients of friction

A process for preparing moldings or coatings by compression molding, transfer molding or injection molding from materials which contain free-radical generators and an organopolysiloxane which can be crosslinked to form organopolysiloxane elastomers, in which the free-radical generators comprise at least one free-radical generator having a half-life in benzene of 1 minute at 60.degree. C. to 149.degree. C. and at least one free-radical generator having a half-life in benzene of 1 minute at 150.degree. C. to 200.degree. C. Other materials which may be molded are those which can be crosslinked by the addition reaction of Si-bonded hydrogen with SiC-bonded vinyl groups and also contain at least one free-radical generator.

Process for preparing moldings or coatings

This invention relates to polymeric organosilicon compounds containing aryl radicals and to a method for improving the gliding or slipping properties of organic fibers treated therewith. The polymeric organosilicon compounds are represented by the formula

Organic fibers having improved slip properties

Organic fibers having improved slip properties produced by treatment

A process for preparing organopolysiloxane resins containing Si-bonded vinyl groups which comprises heating to a temperature of from about 85.degree. to 95.degree. C. a mixture containing (A) an organopolysiloxane having at least 0.1 percent by weight of Si-bonded hydroxyl groups and at least 50 mol percent of monoorganosiloxane units (RSiO.sub.3/2), (B) an organosiloxane containing from 2 to 10 silicon atoms per molecule, in which substantially all the silicon valences which are not satisfied by siloxane oxygen atoms, are satisfied by SiC-bonded hydrocarbon radicals, and having on the average at least two such hydrocarbon radicals for each silicon atom and at least one of the siloxanes (A) and/or (B) has an average of at least one SiC-bonded vinyl group, and (C) an acid activated bleaching clay; wherein the water released during the heating step by the condensation of Si-bonded hydroxyl groups is retained in the reactive mixture.

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Simbach, Germany

Willi Primas