Dow Corning Corporation

Scott S Brown

Richard G Taylor

Peter Y Lo

Bhukandas Parbhoo

Roberto Bortolin

Peter Cheshire Hupfield

Patrick J Merlin

A curable composition which comprises (A) an organosilicon compound having at least one silicon-bonded alkoxy group per molecule and on average at least three hydroxyl and/or alkoxy groups bonded to silicon per molecule; (B) a catalyst component characterized in that the catalyst component is according to the formula ##STR1## wherein R.sup.1 and R.sup.2 each independently represent a pentahapto ligand, R.sup.3 represents a fluoroaromatic ligand having a fluorine atom bonded in the ortho position relative to the M-ligand bond, R.sup.4 represents a group R.sup.3 or a monovalent alkyl, alkenyl, alkoxy, alkoxy alkoxy, halogen, aryl, halo substituted aryl, organosilicon or organosiloxane group and M represents Ti, Zr or Hf, which is curable by exposure by UV radiation; and optionally (C) an organo-silicon having two of silicon-bonded hydroxyl or alkoxy groups per molecule, wherein the organo-silicone is selected from the group consisting of organopolysiloxane and organosilicon-organic copolymer.

Room temperature curable compositions

Organosilicon compounds with a siloxane portion and groups of the general formula --OR'OCH.dbd.CHR' (i) linked via an Si--O--C bond, wherein R' is a divalent hydrocarbon radical or a group --R.degree.--(OR.degree.).sub.n --, wherein R.degree. is alkylene and n is from 1 to 12, R' is H or alkyl are useful in radiation curable compositions, in which they are mixed with an initiator. The compositions are particularly useful in UV radiation curable relase coatings.

Organosilicon compounds and compositions containing them

Organosilicon compounds with a siloxane portion and groups of the general formula --OR'OCH.dbd.CHR'' (i) linked via an Si--O--C bond, wherein R' is a divalent hydrocarbon radical or a group --R.degree.--(OR.degree.).sub.n --, wherein R.degree. is alkylene and n is from 1 to 12, R'' is H or alkyl are useful in radiation curable compositions, in which they are mixed with an initiator. The compositions are particularly useful in UV radiation curable relase coatings.

A method of making silethynyl polymers having units of the general formula--(R.sub.2 SiC.tbd.C)-- wherein each R independently denotes a hydrogen atom, an alkyl, aryl or alkenyl group or a substituted alkyl, aryl or alkenyl group having up to 18 carbon atoms comprises adding a lithium salt of one or more diethynylsilanes of the general formula R.sub.2 Si(C.tbd.CH).sub.2 to one or more dihalosilanes of the general formula R.sub.2 SiX.sub.2 where X is a halogen atom and allowing the components to react. Copolymers with alternating units can be made. Linear polymers are made preferentially. Limiting the use of solvent increases the percentage of linear polymers produced.

Method of making silethynyl polymers

A method of making silethynyl polymers having units of the general formula --(R.sub.2 SiC.tbd.C)-- wherein each R independently denotes a hydrogen atom, an alkyl, aryl or alkenyl group or a substituted alkyl, aryl or alkenyl group having up to 18 carbon atoms comprises adding a lithium salt of one or more diethynylsilanes of the general formula R.sub.2 Si(C.tbd.CH).sub.2 to one or more dihalosilanes of the general formula R.sub.2 SiX.sub.2 where X is a halogen atom and allowing the components to react. Copolymers with alternating units can be made. Linear polymers are made preferentially. Limiting the use of solvent increases the percentage of linear polymers produced.

Method for preparing a platinum-organosiloxane complex which comprises reacting a platinous halide with an organo-siloxane having from 2 to 4 silicon-bonded organic groups containing terminal olefinic unsaturation, the reaction being carried out in the presence of a polar organic liquid, for example dimethylformamide or butan-2-one, which is at least a partial solvent for the platinous halide. The acomplexes are useful as catalysts for hydrosilylation reactions.

Platinum complexes and use thereof

A method of making silethynyl-siloxane copolymers having R.sub.2 SiC.tbd.C units and R.sub.2 SiO units wherein each R denotes H or a C.sub.1-16 hydrocarbon or substituted hydrocarbon group, comprises ring-opening copolymerization in the presence of a catalytic amount of a lithium compound, of cyclic siloxanes and cyclic silethynyl polymers. Novel silethynyl-siloxane copolymers of the formula ##STR1## are also disclosed wherein R' denotes --C.tbd.CH or R and a and b are at least 1.

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Barry, United Kingdom

Scott S Brown