Dual curable silicone compositions
A dual curable silicone composition, comprising: (a) a silicone resin comprising at least one epoxy group, (b) a silicone polymer comprising at least one epoxy group and at least one hydrolyzable group, (c) a catalytic amount of onium salt photo catalyst, (d) a catalytic amount of condensation catalyst, wherein the composition is curable when exposed to UV radiation, H 2 O, or UV radiation and H 2 O.
1. A dual curable silicone composition, comprising:
(a) a silicone resin comprising at least one epoxy group, wherein the silicon resin is according to formula (I)
[R 1 R 2 R 3 SiO 1/2 ] a [R 4 R 5 SiO 2/2 ] b [R 6 SiO 3/2 ] c [SiO 4/2 ] d , (I)
where each R 1-6 is independently hydrocarbyl, H, hydroxyl, alkoxy, or epoxy-containing group and at least one of R 1-6 is an epoxy-containing group, and where a+b+c+d=1 and c+d>0,
(b) a silicone polymer comprising at least one epoxy group and at least one hydrolyzable group, wherein the silicon polymer is according to formula (II)
[R 7 R 8 R 9 SiO 1/2 ] e [R 10 R 11 SiO 2/2 ] f , (II)
where each R 7-11 is independently hydrocarbyl, H, hydroxyl, a hydrolyzable group, or epoxy-containing group and at least one of R 7-11 group is hydrolyzable group and at least one of one R 7-11 group is an epoxy-containing group and wherein e>0 and f>0,
(c) a catalytic amount of onium salt photo catalyst,
(d) a catalytic amount of condensation catalyst,
wherein the composition is curable when exposed to UV radiation, H 2 O, or UV radiation and H 2 O.
2. The composition according to claim 1 , wherein each of the epoxy groups of the silicone resin and the silicone polymer are independently substituted hydrocarbyl having from 1 to 18 carbon atoms, wherein the substitution is an epoxy or epoxy ether group.
3. A composition according to claim 1 , wherein the epoxy group is glycidoxypropyl, glycidyl, hexenyl oxide, hexeneoxyalkyl oxide, [2-(3,4-epoxycyclohexyl)methyl], [2-(3,4-epoxycyclohexyl)ethyl], or [2-(3,4-epoxycyclohexyl)propyl].
4. The composition according to claim 1 , wherein the hydrolyzable group bonded to a silicon atom through a S, O, N, or P, or a halogen atom.
5. The composition according to claim 4 , wherein the hydrolyzable group is C 1-8 alkoxy or halogen.
6. The composition according to claim 1 , wherein the onium salt photo catalyst is a halonium photocatalyst.
7. The composition according to claim 1 , wherein the condensation catalyst is a metal complex of tin, titanium, aluminum, zinc, or zirconium.
8. A method of providing a protective coating to an article, the method comprising:
applying the composition of claim 1 to the article.
9. The protected article formed by the method of claim 8 .
10. A method of making a dual curable composition, the method comprising: combining
(a) a silicone resin comprising at least one epoxy group, wherein the silicon resin is according to formula (I)
[R 1 R 2 R 3 SiO 1/2 ] a [R 4 R 5 SiO 2/2 ] b [R 6 SiO 3/2 ] c [SiO 4/2 ] d , (I)
where each R 1-6 is independently hydrocarbyl, H, hydroxyl, alkoxy, or epoxy-containing group and at least one of R 1-6 is an epoxy-containing group, and where a+b+c+d=1 and c+d>0,
(b) a silicone polymer comprising at least one epoxy group and at least one hydrolyzable group, wherein the silicon polymer is according to formula (II)
[R 7 R 8 R 9 SiO 1/2 ] e [R 10 R 11 SiO 2/2 ] f , (II)
where each R 7-11 is independently hydrocarbyl, H, hydroxyl, a hydrolyzable group, or epoxy-containing group and at least one of R 7-11 group is hydrolyzable group and at least one of one R 7-11 group is an epoxy-containing group and wherein e>0 and f>0,
(c) a catalytic amount of onium salt photo catalyst,
(d) a catalytic amount of condensation catalyst,
wherein the composition is curable when exposed to UV light or hydrolysis conditions.