Mold release compounds using cycloaliphatic epoxide functionalized polydimethylsiloxane coatings and photo-initiated polymerization
The present invention is generally related to mold release compounds having improved cure times, environmental friendliness and durability that are formed from cycloaliphatic epoxide functionalized polydimethylsiloxane compounds In still another embodiment, the present invention relates to mold release compounds that are formed from cycloaliphatic epoxide functionalized poly(dimethylsiloxane-co-methylhydrosiloxane) compounds.
1. A process of making a mold release coating compound comprising the steps of
(A) combining and reacting hydride terminated poly(dimethylsiloxane-co-methylhydrosiloxane), 4-vinyl-1-cyclohexene diepoxide and a rhodium catalyst in a reaction vessel to yield a cycloaliphatic epoxide functionalized polydimethylsiloxane compound;
(B) mixing the cycloaliphatic epoxide functionalized polydimethylsiloxane compound with a photoinitiator and a photosensitizer to yield a mixture;
(C) coating the mixture on a surface to provide release characteristics; and
(D) curing the coating with visible light,
wherein the cycloaliphatic epoxide functionalized polydimethylsiloxane compound is functionalized with at least two cycloaliphatic epoxides with at least one cycloaliphatic epoxide being located on a terminal silicon atom and at least one cycloaliphatic epoxide being located on an internal silicon atom.
2. The process of claim 1 , wherein the photoinitiator is selected from iodonium, sulfonium salts of very strong acids, and mixtures thereof.
3. The process of claim 1 , wherein the photosensitizer is selected from anthracene, phenanthrene, methylene blue, phthalocanine, carbazoles and mixtures thereof.
4. The process of claim 1 , wherein the photosensitizer is present in an amount of 0.01 to 10 percent by weight.