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US 7,923,524 B2Granted
Silicone copolymer having condensed polycyclic hydrocarbon group
AssigneeTokyo Ohka Kogyo Co., Ltd.
InventorTakeshi Nishikawa
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Abstract
Provided is a novel silicone copolymer which exhibits high absorption even in a far-ultraviolet region of 200 nm or more, and also is soluble in an alkaline reagent since it has a phenolic hydroxyl group. The silicone copolymer comprises a silsesquioxane having a phenol unit and comprises a silsesquioxane having a condensed polycyclic hydrocarbon.
Claims4
A silicone copolymer comprising:
- silsesquioxane having a phenol unit represented by general formula (I) below;
- and
- a silsesquioxane unit represented by general formula (II) below:
- wherein n represents an integer of 0 to 10,
- wherein A represents a naphthyl group or a phenanthrenyl group.
2 more elements
Dependencies are inferred from the claim text.