Epoxy-functionalized siloxane resin copolymers as controlled release additives

Claim 2

A composition according to claim 1 wherein R and R² are each methyl groups; R¹ and R³ are each groups derived from 4-vinylcyclohexeneoxide; "x" is a number ranging from 1 to about 20; and "y" is a number ranging from about 1 to about 100.

Claim 3

A composition according to claim 2 wherein "x" is a number ranging from 1 to about 10 and "y" is a number ranging from about 95 to about 100.

Claim 4

A composition according to claim 1 wherein the photocatalyst is present in an amount within the range of from about 1% to about 5% by weight based on component (A).

Claim 5

A composition according to claim 1 wherein in component (C), the R³R 2 2 SiO 1/2 units preferably comprise from about 10% to about 50% of the total number of monovalent units present.

Claim 6

A composition according to claim 1 wherein component (C) is present in an amount within the range of from 20% to about 30% by weight based on component (A).

Claim 7

A composition according to claim 1 further comprising a hydrocarbon solvent or halogenated hydrocarbon solvent in an amount sufficient to provide the composition with a solids content of from about 10 to about 50% by weight and a solvent content of from about 50 to about 90% by weight, the percentages being based on the total weight of the composition.

Claim 8

An improved ultraviolet radiation-curable epoxyfunctionalized silicone controlled release composition, having a release of at least about 500 grams/2 inches, comprising: (A) an epoxyfunctional diorganopolysiloxane having the general formula R₂R¹SiO(RR¹SiO) x (R₂SiO) y SiR₂R¹   (I) wherein R is individually a lower alkyl radical having from 1 to about 8 carbon atoms; R¹ individually is a monovalent cycloaliphatic epoxy-functional organic radical having from 2 to about 20 carbon atoms; "x" is a number ranging from about 1 to about 50; and "y" is a number ranging from about 1 to about 1000; (B) a catalytic amount of a photocatalyst or a combination of photocatalysts; and (C) from about 20% to about 30% by weight based on (A) of a siloxane resin comprising monovalent R 2 3 SiO 1/2 and R³R 2 2 SiO 1/2 units and tetravalent SiO 4/2 units, the ratio of the monovalent units to tetravalent units being from about 0.6:1 to about 1.1:1; wherein R² individually is a monovalent hydrocarbon radical of no more than 2 carbon atoms, R³ is a monovalent epoxy functional organic radical of from about 2 to about 20 carbon atoms; and the R³R 2 2 SiO 1/2 units comprising from about 1% to about 90% of the total number of monovalent units present; and (D) a hydrocarbon solvent in an amount sufficient to provide the composition with a solids content of about 20% by weight and a solvent content of about 80% by weight, the percentages being based on the total weight of components (A)-(D).

Claim 9

A composition according to claim 8 wherein (A) is a dimethylepoxy-chainstopped polydimethylmethylepoxysiloxane having the general formula (CH₃)₂R¹SiO(CH₃R¹SiO) x [(CH₃)₂SiO] y Si(CH₃)₂R¹ wherein R¹ is a monovalent cycloaliphatic epoxy-functional organic radical derived from 4-vinylcyclohexeneoxide; "x" is a number ranging from about 1 to about 20; and "y" is a number ranging from about 1 to about 100; (B) is a bis(dodecylphenyl)iodonium hexafluoroantimonate present in an amount within the range of from about 1% to about 5% by weight based on (A); (C) is a siloxane resin comprising monovalent (CH₃)₃SiO 1/2 and R³(CH₃)₂SiO 1/2 units and tetravalent SiO 4/2 units, present in an amount within the range of from about 20% to about 30% by weight based on (A), the ratio of the monovalent units to tetravalent units being from about 0.6:1 to about 1.1:1, wherein R³ is a monovalent cycloaliphatic epoxy-functional organic radical derived from 4-vinylcyclohexeneoxide; the R³(CH₃)₂SiO 1/2 units comprising from about 10% to about 50% of the total number of monovalent units present; and (D) is selected from the group consisting of acetone, hexane, toluene, methylene chloride, or a mixture of the foregoing.

Claim 10

A composition according to claim 9 wherein "x" is a number ranging from about 1 to about 10; "y" is a number ranging from about 95 to about 100; (B) is present in an amount within the range of from about 1% to about 3% by weight based on (A); (C) is present in an amount within the range of from about 25% to about 30% by weight based on (A); the R³(CH₃)₂SiO 1/2 units in (C) comprise from about 10% to about 25% of the total number of monovalent units present; and (D) is a mixture of hexane and acetone with a hexane:acetone weight ratio of 1:1.