Uv-curable silicon release compositions

Claim 2

An ultraviolet radiation curable controllable release composition comprising a compatible mixture comprising a) an incompatible mixture of (1) x parts by weight of a polyepoxypolysiloxane fluid and (2) y parts by weight of a silicone-free polyfunctional epoxy compound, b) z parts by weight of a compatibilizing amount of a monofunctional epoxy compound, and c) an effective amount of a photoinitiator for ultraviolet activated cationic polymerization wherein x is 5% to 95% of (x+y) and y is 95% to 5% of (x+y), z has a value between w and 24, in which w is the least parts by weight required to compatibilize the incompatible mixture of x parts of epoxy polysiloxane and y parts of polyfunctional epoxy compound, and x+y+z=100.

Claim 3

The controllable release composition according to claim 1 wherein the epoxypolysiloxane has the following average formula: ##STR6## wherein R is a lower alkyl group of one to three carbon atoms, R 1 is a monovalent hydrooarbyl group of 4 to 20 carbon atoms, E is a monovalent epoxy-containing hydrocarbyl group, a, b, and c are independently 0 or a number having a value up to about 20,000, the sum (a+b+c) being 0 or a number having a value up to about 20,000; and M is a silyl group R d R 1 e E f Si- in which d, e, and f are independently 0, 1, 2, or 3 and the sum (d+e+f) is equal to 3; with the proviso that when c is 0 then M is R g R 1 h E j Si- in which g and h are equal to 0, 1, or 2 and j is 1, 2, or 3 and the sum (g+h+j) is equal to 3.

Claim 4

The composition according to claim 2 wherein E further comprises ether or ester oxygen.

Claim 5

The composition according to claim 2 wherein E is an oxiranyl group-substituted monovalent linear or branched aliphatic group.

Claim 6

The composition according to claim 1 wherein said polyfunctional epoxy compound is selected from the group consisting of di(2,3-epoxypropyl) isophthalate, 1-(2,3-epoxypropyl)-2-(2,3-epoxypropoxy)benzene, di(2,3-epoxypropyl)adipate, 1,3-bis(2,3-epoxypropoxy)benzene, 1,3,5-tris(2,3-epoxypropoxy)benzene, 2,2-bis[4-(2,3-epoxypropoxy)phenyl]propane, 2,2-bis[4-(2,3-epoxypropoxy)phenyl]ether, polyglycidyl ether of phenol-formaldehyde novolac, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 1,4-bis(2,3-epoxypropoxy)butane, 1,2,3-tris(2,3-epoxypropoxy)propane,

Claim 7

2-bis[4-(2,3-epoxypropoxy)cyclohexyl]propane, 4-(1,2-epoxyethyl)-1,2-epoxycyclohexane, 1,2-8,9-diepoxy-p-menthane, and 2-(3,4-epoxycyclohexyl)-5,5-spiro-3,4-epoxy cyclohexane-meta-dioxane bis(3,4-epoxycyclohexyl) adipate.

Claim 8

2-bis[4-(2,3-epoxypropoxy)cyclohexyl]propane, 4-(1,2-epoxyethyl)-1,2-epoxycyclohexane, 1,2-8,9-diepoxy-p-menthane, and 2-(3,4-epoxycyclohexyl)-5,5-spiro-3,4-epoxy cyclohexane-meta-dioxane bis(3,4-epoxycyclohexyl) adipate.

Claim 9

the composition according to claim 5 wherein said silicone-free polyfunctional epoxy compound is a blend of silicone-free polyepoxy resins with reactive diluents, the blend being incompatible with polyepoxypolysiloxane fluids.

Claim 10

The composition according to clam 1 wherein said monofunctional epoxide is selected from the group consisting of butyl 2,3-epoxypropyl ether, hexyl 2,3-epoxypropyl ether, phenyl 2,3-epoxypropyl ether, 4-methylphenyl 2,3-epoxypropyl ether, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, 1,2-epoxyoctane, 2,3-epoxyoctane, 1,2-epoxydecane, 1,2-epoxydodecane, 1,2-epoxytetradecane, and 1,2-epoxyhexadecane.

Claim 11

The composition according to clam 1 wherein said monofunctional epoxide is selected from the group consisting of butyl 2,3-epoxypropyl ether, hexyl 2,3-epoxypropyl ether, phenyl 2,3-epoxypropyl ether, 4-methylphenyl 2,3-epoxypropyl ether, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, 1,2-epoxyoctane, 2,3-epoxyoctane, 1,2-epoxydecane, 1,2-epoxydodecane, 1,2-epoxytetradecane, and 1,2-epoxyhexadecane.

Claim 12

The composition according to claim 7 wherein said monofunctional epoxide is selected from the group consisting of 1,2-epoxydodecane, 1,2-epoxytetradecane and 1,2-epoxyhexadecane.

Claim 13

The composition according to clam 1 wherein said photoinitiator is an onium salt of a complex halogen acid.

Claim 14

The composition according to clam 1 wherein said photoinitiator is an onium salt of a complex halogen acid.

Claim 15

The composition according to claim 9 wherein said onium salt is an iodonium or sulfonium salt.

Claim 16

The composition according to clam 1 wherein said photoinitiator is a supported photoinitiator.

Claim 17

The composition according to clam 1 wherein said photoinitiator is a supported photoinitiator.

Claim 18

The composition according to claim 1 further comprising an effective amount of a spectral sensitizer.

Claim 19

The composition according to clam 1 further comprising an effective amount of an organic solvent.

Claim 20

The composition according to clam 1 further comprising an effective amount of an organic solvent.

Claim 21

The cured composition according to claim 1.

Claim 22

The composition according to claim 14 which has been cured by radiation in the range of 200 to 600 nm and optionally thermal energy.

Claim 23

The cured composition according to claim 14 which is a release coating on a substrate.

Claim 24

A release liner comprising a substrate having on at least one surface thereof a layer of the composition according to claim 14.

Claim 25

An adhesive tape comprising a layer of the composition according to claim 14. composition according to claim 14.