UV curable silicone composition and cured product thereof
View Patent ↗The present invention relates to a UV curable silicone composition comprising at least one organopolysiloxane having at least two alkenyl groups per molecule; at least one mercapto functional organic compound having at least two thiol groups per molecule; at least one photopolymerization initiator; and at least one polymerization inhibitor comprising at least one alkoxylated polyol derived (meth)acrylate or at least one quinone derivative compound, and/or at least one antioxidant, wherein the composition comprises the photopolymerization initiator selected from intramolecular hydrogen abstraction type photopolymerization initiators, or the composition comprises the polymerization inhibitor.
1 . A UV curable silicone composition comprising:
(A) at least one organopolysiloxane having at least two alkenyl groups per molecule;
(B) at least one mercapto functional compound having at least two thiol groups per molecule;
(C) at least one photopolymerization initiator; and
(D) (d-1) at least one polymerization inhibitor comprising at least one alkoxylated polyol derived (meth) acrylate or at least one quinone methide compound, and/or (d-2) at least one antioxidant, wherein,
(i) the (C) at least one photopolymerization initiator is selected from intramolecular hydrogen abstraction type photopolymerization initiators and the (d-2) at least one antioxidant is present, or
(ii) the (d-1) at least one polymerization inhibitor is present;
wherein the (d-2) at least one antioxidant is chosen from a phenol, a hydroquinone; a quinone, an aromatic nitro compound; a nitrophenol, an amine; a nitroso compound; a nitroxide compound, and combinations thereof.
2 . The composition according to claim 1 , wherein the mercapto functional compound comprises primary or secondary thiol groups.
3 . The composition according to claim 1 , wherein the mercapto functional compound comprises a dithiol compound.
4 . The composition according to claim 1 , wherein the intramolecular hydrogen abstraction type photopolymerization initiator comprises an oxyethoxy phenylacetyl derivative.
5 . The composition according to claim 1 , wherein the mercapto functional organic compound is present in an amount of 3% by weight or more and 50% by weight or less relative to the total weight of the composition.
6 . The composition according to claim 1 , wherein the antioxidant is a hindered phenol-type antioxidant.
7 . A sealing agent or sheet film formed with the UV curable silicone composition according to claim 1 .
8 . The composition according to claim 6 , wherein the hindered phenol-type antioxidant comprises a thioester group to form a thioester antioxidant.
9 . The composition according to claim 8 , wherein the thioester antioxidant comprises at least two thioester groups.
10 . The composition according to claim 1 comprising (d-1) and (d-2).