One-part UV-curable epoxy silicone compositions

In an ultraviolet curable composition where

• (A) is selected from the group consisting of:
• (I) linear epoxy-functional silicones having the general formula:
• ##STR19## (II) linear epoxy-functional silicones having the general formula:
• ##STR20## (III) resinous epoxy-functional silicones having the general formula:
• ##STR21## (IV) resinous epoxy-functional silicones having the general formula:
• ##STR22## wherein E represents an epoxy-functional group of from about 2 to 20 carbon atoms, R represents an alkyl radical having from 1 to about 10 carbon atoms, R.sup.1 represents a hydrogen atom or an alkyl or perfluoroalkyl radical having from about I to about 8 carbon atoms, R.sup.2 represents an alkyl radical having from 1 to about 10 carbon atoms, "a" represents a number from 0 to about 400, "b" represents a number from 1 to about 100, "c" represents a number from 0 to about 100, and "d" represents a number from 0 to about 100;
• (B) is an epoxysilicone polyether block copolymer having the formula:
• M.sup.E D.sub.x D'O(PEO).sub.y D'DM.sup.E
• where:
• i) M.sup.E is R.sub.2 ESiO.sub.1/2 with E an alkylepoxide radical,
• ii) D is R.sub.2 SiO,
• iii) D' is R.sub.2 SiOCH.sub.2 CH.sub.2 CH.sub.2 --,
• iv) PEO is polyethylene oxide,
• x ranges up to about 400 and y ranges from about 1 to about 50 wherein (B) has a viscosity ranging from 10 to about 10,000 centistokes and where R is as previously defined;
• a curable composition comprising;
• 1) an epoxysilicone selected from the group consisting of (A), (B) and mixtures thereof;
• 2) a sulfonium salt photocatalyst having the general formula:
• R.sup.3.sub.3 S.sup.+ MX.sub.n.sup.-
• where R.sup.3 is independently selected from the group of organic radicals having from 1 to 30 carbon atoms and MX.sub.n.sup.- is a non-basic, non-nucleophilic anion selected from the group consisting of tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate, hexafluoroantimonate, hexachloroantimonate, bisulfate, and perchlorate;
• and
• 3) a co-curable fluoro-containing organic molecule wherein said fluoro-containing organic molecule is miscible with both said epoxysilicone and said sulfonium salt photocatalyst;
• whereby said composition has a shelf stability of at least seven weeks at room temperature.

A one part ultraviolet curable composition comprising a mixture of:

• 1) an epoxysilicone polyether block copolymer having the formula:
• M.sup.E D.sub.x D'O(PEO).sub.y D'DM.sup.E
• where:
• i) M.sup.E is R.sub.2 ESiO.sub.1/2 with E an alkylepoxide radical,
• ii) D is R.sub.2 SiO,
• iii) D' is R.sub.2 SiOCH.sub.2 CH.sub.2 CH.sub.2 --,
• iv) PEO is polyethylene oxide,
• x ranges up to about 400 and y ranges from about 1 to about 50 wherein said epoxysilicone polyether block copolymer has a viscosity ranging from 10 to about 10,000 centistokes and where R represents an alkyl radical having from 1 to about 10 carbon atoms;
• and
• 2) a sulfonium salt photocatalyst having the general formula:
• R.sup.3.sub.3 S.sup.+ MX.sub.n.sup.-
• where R.sup.3 is independently selected from the group of organic radicals having from 1 to 30 carbon atoms and MX.sub.n.sup.- is a non-basic, non-nucleophilic anion selected from the group consisting of tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate, hexafluoroantimonate, hexachloroantimonate, bisulfate, and perchlorate;
• whereby said composition has a shelf stability of at least seven weeks at room temperature.