Modified hydrogen silsesquioxane resin
AssigneeDow Corning Corporation
InventorGregg A. Zank
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Abstract
Disclosed is a novel resin of the structure (HSiO.sub.1.5).sub.x (R.sub.1 R.sub.2 R.sub.3 SiO.sub.0.5).sub.y, wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from hydrogen, alkyls and aryls, x is 0.25 to 0.99, y is 0.01 to 0.75 and x+y=1.0. Also disclosed is a method for making these resins.
Claims12
A method for modifying hydrogen silsesquioxane resin comprising:
- refluxing a mixture comprising 1 part by weight hydrogen silsesquioxane resin of the structure HSi(OH).sub.x (X).sub.y O.sub.z/2, in which each X is a hydrolyzable substituent, x=0-2, y=0-2, z=1-3, x+y+z=3, between 0.1 and 10 parts by weight of an endcapping agent of the structure (R.sub.1 R.sub.2 R.sub.3 Si).sub.2 O, wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from hydrogen, alkyls, alkenyls or aryls, between 0.0001 and 0.05 parts by weight of an acid and between 0.01 and 0.5 parts by weight water, for a time sufficient to modify the hydrogen silsesquioxane resin;
- cooling the reaction mixture;
- and
- recovering the resin.
Modified hydrogen silsesquioxane resin of the structure (HSiO.sub.1.5).sub.x (R.sub.1 R.sub.2 R.sub.3 SiO.sub.0.5).sub.y, wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from hydrogen, alkyls or aryls, x is 0.25 to 0.99, y is 0.01 to 0.75 and x+y=1.0.
Dependencies are inferred from the claim text.