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US 5,492,981 AGranted
Casting resin of epoxyalkylsiloxane, epoxy resin and anhyride
AssigneeSiemens Aktiengesellschaft
InventorsKlaus Hoehn, Ulrike Reeh, Ernst Wipfelder, Guenther Waitl
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Abstract
A casting resin system containing epoxyalkylsiloxane is provided for covering optoelectronic components. The casting resin system includes a resin constituent containing a mixture of epoxyalkylsiloxanes and cycloaliphatic epoxy resins. The casting resin system can be hardened with a polycarboxylic acid anhydride as a hardener component to form molding materials that are transparent and color-stable.
Claims3
A casting resin system containing epoxyalkylsiloxane comprising:
- a resin constituent including approximately 5% to 95% by weight of an epoxyalkylsiloxane and approximately 95% to 5% by weight of an epoxy resin, the epoxyalkylsiloxane is a condensation product of an epoxyalkoxysilane having a general formula (1) and a silanol having a general formula (2) reacted in ##STR4## wherein R1 is an alkyl radical having one to six carbon atoms or an aryl radical;
- R2 is a glycidyloxy alkyl, an epoxyalkyl or an epoxycycloalkyl radical;
- and R3 are independently selected from OR1, R2, an alkyl, or an aryl radical;
- R4 is an alkyl or an aryl;
- R5 are independently selected from OH or R4;
- and n is a whole number with 1.ltoreq.n.ltoreq.12;
- and
- a hardener constituent including at least one polycarboxylic acid anhydride.
5 more elements
Dependencies are inferred from the claim text.