Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2002-09-12
2008-09-09
Sellers, Robert (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S303000, C524S548000, C525S327300
Reexamination Certificate
active
07423083
ABSTRACT:
A photosemiconductor encapsulating resin composition, excellent in light transmittance, ultraviolet resistance and heat resistance, comprising the following component (A) and component (B):(A): a (meth)acrylic polymer containing an epoxy group, and(B): at least one hardener selected from the group consisting of the following components (b1) to (b4):(b1) a polyvalent carboxylic acid,(b2) a polyvalent carboxylic anhydride,(b3) a reaction product of a polyvalent carboxylic acid with a compound of the following general formula (B-1), and(b4) a reaction product of a polyvalent carboxylic anhydride with a compound of the following general formula (B-2)wherein R1to R6represent each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, R3and R4may be bonded to form an alkylene group having 1 to 8 carbon atoms; R7represents an alkylene group; a methylene group contained the alkylene group and the alkyl group represented by R1to R7may be substituted by an ether group and/or carbonyl group; Y1and Y2represent each independently an oxygen atom, or sulfur atom, is provided.
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Hasegawa Toshiyuki
Kawaguchi Yujiro
Naitoh Shigeki
Foley & Lardner LLP
Sellers Robert
Sumitomo Chemical Company Limited
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