UV curable composition
AssigneeDow Corning Corporation
InventorGeorge A. L. Gant
Life of this patent
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Abstract
A composition curable upon exposure to ultraviolet light is disclosed which consists essentially of a vinyl-containing siloxane and siloxane-containing, silicon-bonded hydrogen atoms. A mercaptofunctional silicone can be employed in the composition as a cure accelerator. Another composition curable upon exposure to ultraviolet light which is disclosed consists essentially of a mercaptofunctional siloxane and a vinyl-containing siloxane.
Claims16
A composition, curable upon exposure to ultraviolet light, which consists essentially of
- A. a siloxane consisting essentially of from 0.5 to 100 mole percent of vinyl containing siloxane units of the general formula (CH.sub.2 =CH)R.sub.n SiO.sub.(3-n/2) wherein R is a monovalent hydrocarbon or monovalent halogenated hydrocarbon radical and n has a value from 0 to 2, any non-vinyl containing siloxane units present having the general formula R'.sub.m SiO.sub.(4-m/2) wherein R' is a monovalent hydrocarbon or monovalent halogenated hydrocarbon radical and m has a value from 0 to 3,
- B. a siloxane containing at least one silicon bonded hydrogen atom,
- the ratio of silicon bonded vinyl groups in (A) to the silicon bonded hydrogen atoms in (B) being in the range of 1:100 to 100:1, and (C) a photosensitizing amount of 0.01 to 20 percent by weight a photosensitizer.
A composition, curable upon exposure to ultraviolet light, which consists essentially of
- 1. a siloxane consisting essentially of from 0.1 to 100 mole percent of mercaptopropylsilsesquioxane units, any other siloxane units present in (1) being methylsilsesquioxane, propylsilsesquioxane, dimethylsiloxane and trimethylsiloxane units, and
- 2. a mixture of vinylmethylcyclosiloxanes, the ratio of the mercapto groups in (1) to the vinyl groups in (2) being in the range of 1:100 to 100:1, and (3) a photosensitizing amount of 0.01 to 20 percent by weight of a photosensitizer.
A composition, curable upon exposure to ultraviolet light, which consists essentially of
- 1. a siloxane consisting essentially of from 0.1 to 100 mole percent of mercaptopropylsilsesquioxane units, any other siloxane units present in (1) being propylsilsesquioxane, dimethylsiloxane and trimethylsiloxane units, and
- 2. a mixture of vinylmethylcyclosiloxanes, the ratio of the mercapto groups in (1) to the vinyl groups in (2) being in the range of 1:100 to 100:1, and (3) a photosensitizing amount of 0.01 to 20 percent by weight of a photosensitizer.
Dependencies are inferred from the claim text.