Epoxy-functionalized siloxane resin copolymers as controlled release additives

Claim 1

A method for increasing the release of an ultraviolet-curable epoxy functional polydiorganosiloxane release composition comprising (A) an epoxyfunctional diorganopolysiloxane having the general formula R.sub.2 R.sup.1 SiO(RR.sup.1 SiO).sub.y SiR.sub.2 R.sup.1 wherein R individually is a lower alkyl radical having from 1 to about 8 carbon atoms; R 1 individually is a monovalent cycloaliphatic epoxy-functional organic radical having from 2 to about 20 carbon atoms; "x" is a number ranging from 1 to about 50; and "y" is a number ranging from about 1 to about 1000; and (B) a catalytic amount of a photocatalyst or a combination of photocatalysts; comprising (i) contacting (A) and (B) with from about 1% to about 30% by weight based on (A) of (C) a siloxane resin comprising monovalent R 3 2 SiO 1/2 and R 3 R 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 R 2 individually is a monovalent hydrocarbon radical of no more than 2 carbon atoms, R 3 is a monovalent epoxy functional organic radical of from about 2 to about 20 carbon atoms; and the R 3 R 3 2 SiO 1/2 units comprising from about 1% to about 90% of the total number of monovalent units present; and (ii) dispersing components (A), (B) and (C) in (D) a 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 components, (B), (C) and (D).

Claim 2

A method for increasing the release of an ultraviolet-curable epoxy functional polydiorganosiloxane release composition comprising (A) an epoxyfunctional diorganopolysiloxane having the general formula R.sub.2 R.sup.1 SiO(RR.sup.1 SiO).sub.y SiR.sub.2 R.sup.1 wherein R individually is a lower alkyl radical having from 1 to about 8 carbon atoms; R 1 individually is a monovalent cycloaliphatic epoxy-functional organic radical having from 2 to about 20 carbon atoms; "x" is a number ranging from 1 to about 50; and "y" is a number ranging from about 1 to about 1000; and (B) a catalytic amount of a photocatalyst or a combination of photocatalysts; comprising (i) contacting (A) and (B) with from about 1% to about 30% by weight based on (A) of (C) a siloxane resin comprising monovalent R 3 2 SiO 1/2 and R 3 R 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 R 2 individually is a monovalent hydrocarbon radical of no more than 2 carbon atoms, R 3 is a monovalent epoxy functional organic radical of from about 2 to about 20 carbon atoms; and the R 3 R 3 2 SiO 1/2 units comprising from about 1% to about 90% of the total number of monovalent units present; and (ii) dispersing components (A), (B) and (C) in (D) a 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 components, (B), (C) and (D).

Claim 3

A method for increasing to a level of at least about 500 grams/2 inches the release of an ultraviolet-curable epoxy functional polydiorganosiloxane release composition comprising (A) an epoxyfunctional diorganopolysiloxane having the general formula 8,9 R.sub.2 R.sup.1 SiO)RR.sup.1 SiO).sub.x (R.sub.2 SiO).sub.y SiR.sub.2 R.sup.1 wherein R individually is a lower alkyl radical having from 1 to about 8 carbon atoms; R 1 individually is a monovalent cycloaliphatic epoxy-functional organic radical having from 2 to about 20 carbon atoms; "x" is a number ranging from 1 to about 50; and "y" is a number ranging from about 1 to about 1000; and (B) a catalytic amount of a photocatalyst or a combination of photocatalysts; comprising (i) contacting (A) and (B) with from about 20% to about 30% by weight based on (A) of (C) a siloxane resin comprising monovalent R 3 2 SiO 1/2 and R 3 R 2 2 SiO 1/2 units and tetravalent SiO 4/2 units, the ratio of monovalent units to tetravalent units being from about 0.6:1 to about 1.1:1; wherein R 2 individually is a monovalent hydrocarbon radical of no more than 2 carbon atoms, R 3 is a monovalent epoxy functional organic radical of from about 2 to about 20 carbon atoms; the R 3 R 2 2 SiO 1/2 units comprising from about 1% to about 90% of the total number of monovalent units present, and (ii) dispersing components (A), (B) and (C) in (D) a hydrocarbon solvent in an amount sufficient to provide the composition with a solids content of from about 20% by weight and a solvent content of about 80% by weight, the percentages being based on the total weight of components (A), (B), (C) and (D).

Claim 4

A method for increasing to a level of at least about 500 grams/2 inches the release of an ultraviolet-curable epoxy functional polydiorganosiloxane release composition comprising (A) an epoxyfunctional diorganopolysiloxane having the general formula 8,9 R.sub.2 R.sup.1 SiO)RR.sup.1 SiO).sub.x (R.sub.2 SiO).sub.y SiR.sub.2 R.sup.1 wherein R individually is a lower alkyl radical having from 1 to about 8 carbon atoms; R 1 individually is a monovalent cycloaliphatic epoxy-functional organic radical having from 2 to about 20 carbon atoms; "x" is a number ranging from 1 to about 50; and "y" is a number ranging from about 1 to about 1000; and (B) a catalytic amount of a photocatalyst or a combination of photocatalysts; comprising (i) contacting (A) and (B) with from about 20% to about 30% by weight based on (A) of (C) a siloxane resin comprising monovalent R 3 2 SiO 1/2 and R 3 R 2 2 SiO 1/2 units and tetravalent SiO 4/2 units, the ratio of monovalent units to tetravalent units being from about 0.6:1 to about 1.1:1; wherein R 2 individually is a monovalent hydrocarbon radical of no more than 2 carbon atoms, R 3 is a monovalent epoxy functional organic radical of from about 2 to about 20 carbon atoms; the R 3 R 2 2 SiO 1/2 units comprising from about 1% to about 90% of the total number of monovalent units present, and (ii) dispersing components (A), (B) and (C) in (D) a hydrocarbon solvent in an amount sufficient to provide the composition with a solids content of from about 20% by weight and a solvent content of about 80% by weight, the percentages being based on the total weight of components (A), (B), (C) and (D).