Wacker-chemie Gmbh

Friedrich Hockemeyer

Gerhard Preiner

Christian Herzig

Richard Weidner

Wolfgang Hechtl

Paul Hittmair

Heinrich Marwitz

Volker Frey

Michael Geck

Johann Muller

Peter John

Peter August

Helmut Oswaldbauer

Alfred Rengstl

Robert Banfic

Oliver Zoellner

Christa Burger

Reinhardt Muller

Hartmut Jahn

The invention relates to new, cross-linkable compounds containing (A,) linear organopolysiloxanes with aliphatically unsaturated hydrocarbon radicals, said organopolysiloxanes being of general formula (I) R,R,SiO(R,SiO),&lsqb;R,Si&mdash;Y&mdash;SiR,O(R,SiO),&rsqb;,SiR,R,, wherein R can be the same or different, and represents a monovalent, optionally halogenated hydrocarbon radical which is free of terminal aliphatic carbon&mdash;carbon multiple bonds, R,represents a monovalent aliphatically unsaturated hydrocarbon radical, Y represents a bivalent organic radical which is free of terminal aliphatic carbon&mdash;carbon multiple bonds, a is 0 or 1, b is 0 or 1, and the sum of a&plus;b per molecule is 1 or 2, c is a whole number to the value of 1 to 1000, d is 0 or a whole number to the value of 1 to 10, and optionally, (A,) MQ silicone resins which are soluble in (A,), on the condition that if MQ silicone resins (A,) are not used, the sum of a&plus;b in the formula (I) is 1.3 to 1.9 on average and that if MQ silicone resins (A,) are used, the sum of a&plus;b in formula (I) is 1.0 to 1.9 on average; (B) organo-silicon compounds with Si-bonded hydrogen atoms; (C) catalysts which promote the formation of an aliphatic multiple bond by Si-bonded hydrogen; and optionally, (D) agents which slow down the formation of an aliphatic multiple bond by Si-bonded hydrogen at room temperature.

Cross-linkable compounds, optionally containing MQ silicon resins

Organopolysiloxanes having aliphatically unsaturated radicals, the

The present invention relates to organopolysiloxane resin solutions which contain 1-alkenes and are free from aromatic hydrocarbons, processes for their preparation and their use in organopolysiloxane compositions from which it is possible to produce coatings which repel tacky substances.

Organopolysiloxane resin solutions, processes for their preparation, and

The present invention relates to siloxane copolymers containing alkenyl groups and a process for their preparation. The siloxane copolymers of the present invention can be used in cross-linkable compositions for the production of coatings which repel tacky substances, an example of which would include coatings for release papers or films.

Siloxane copolymers containing alkenyl groups, their preparation and

Crosslinkable compositions and their use in the production of coatings

Compositions which may be crosslinked to form adhesive-repellent coatings having increased separation values, comprising organopolysiloxanes in which at least 95 mol percent of the siloxane units have the formula

Radiation-crosslinkable compositions

Organopolysiloxanes having a viscosity of at least 100 mPa.s at 25.degree. C. and having both SiC-bonded acryloxyalkyl groups and Si-bonded hydrogen atoms in the same molecule are described herein. These are preferably prepared by adding an allyl alcohol to diorganopolysiloxanes containing an Si-bonded hydrogen atom in each of their terminal units, then esterifying the hydroxyl groups of the resultant reaction product with acrylic acid and subsequently equilibrating the resultant diorganopolysiloxanes containing an SiC-bonded acryloxypropyl group in each of their terminal units, with organo(poly)siloxanes containing an Si-bonded hydroxyl group in each of their terminal units, in which the organo(poly)siloxanes contain methylhydrogensiloxane units and optionally diorganosiloxane units of the formula

Organopolysiloxanes containing both acryloxyalkyl groups and Si-bonded

Organopolysiloxanes which are crosslinked by high energy radiation consisting essentially of siloxane units of the formulas:

Crosslinkable organopolysiloxanes and a method for preparing the same

Coatings which have a predetermined degree of adhesive-repellency are prepared by applying to surfaces which are to be rendered adhesive-repellent an organopolysiloxane having Si-bonded hydrogen and an aliphatic multiple bond in the same molecule and a catalyst which promotes the addition of Si-bonded hydrogen to an aliphatic multiple bond, and thereafter crosslinking the organopolysiloxane by the addition of Si-bonded hydrogen to an aliphatic multiple bond. The organopolysiloxane having both an aliphatic multiple bond and Si-bonded hydrogen in the same molecule, has a viscosity of at least 300 mPa.s at 25.degree. C. The adhesive-repellency of the coated substrate is at least partially dependent on the ratio of Si-bonded hydrogen to the aliphatic multiple bond, i.e., the higher the ratio of Si-bonded hydrogen to the aliphatic multiple bond, the lower the adhesive-repellency. Organic compounds containing at least one grouping of the formula ##STR1## in an amount to retard or prevent the addition of Si-bonded hydrogen to an aliphatic multiple bond at room temperature, are to be excluded from the adhesive-repellent compositions of this invention.

Process for preparing adhesive-repellent coatings

Coating compositions which impart adhesive repellent or non-adherent properties to substrates coated therewith comprising (1) vinyl endblocked diorganopolysiloxanes having an average viscosity in excess of 10.sup.6 cP at 25.degree. C. in which from 3 to 30 mole percent of the nonterminal siloxane units are diphenylsiloxane units and at least 50 mole percent of the remaining organic radicals on the siloxane units are methyl radicals, (2) organopolysiloxanes having at least 3 Si-bonded hydrogen atoms per molecule, (3) catalysts which promote the addition of Si-bonded hydrogen atoms to the vinyl groups and (4) an inert organic solvent. These coating compositions may be applied to cellulosic materials and other substrates to impart varying degrees of adhesive repellency thereto.

Adhesive repellent coatings and substrates coated therewith

A process for preparing adhesive repellent coatings which comprises applying to the surface to be rendered adhesive repellent a mixture containing (1) a diorganopolysiloxane having an Si-bonded vinyl group in each of the terminal units, but is otherwise free of aliphatic unsaturation, (2) an organopolysiloxane having at least 3 Si-bonded hydrogen atoms per molecule, (3) a vinylsiloxane platinum complex and (4) an organic or organosilicon compound which retards or delays the addition of Si-bonded hydrogen to aliphatic multiple bonds, said compound has a boiling point of at least 25.degree. C. at 760 mm Hg (absolute) and at least one aliphatic triple bond, and thereafter crosslinking the diorganopolysiloxane (1).

Process for preparing adhesive repellent coatings and coated article

Coating compositions which impart adhesive repellent or non-adherent properties to substrates coated therewith comprising (1) vinyl endblocked diorganopolysiloxanes having an average viscosity in excess of 10.sup.6 cP at 25.degree. C. in which from 3 to 39 mole percent of the nonterminal siloxane units are diphenylsiloxane units and at least 50 mole percent of the remaining organic radicals on the siloxane units are methyl radicals, (2) organopolysiloxanes having at least 3 Si-bonded hydrogen atoms per molecule, (3) catalysts which promote the addition of Si-bonded hydrogen atoms to the vinyl groups and (4) an inert organic solvent. These coating compositions may be applied to cellulosic materials and other substrates to impart varying degrees of adhesive repellency thereto.

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Emmerting, Germany

Friedrich Hockemeyer