Patent ID: 8785525

Claim:
A thermosetting light-reflecting resin composition, comprising (A) an epoxy resin, (B) a curing agent, (C) a curing catalyst, (D) an inorganic filler, (E) a white pigment, (F) an additive, and (G) a release agent, wherein: the white pigment (E) is a combination of inorganic hollow particles and at least one selected from the group consisting of alumina, magnesium oxide, antimony oxide, titanium oxide, and zirconium oxide; the additive (F) includes a triblock copolymer which is a compound represented by formula (III): wherein l is an integer of 1 to 200, m 1 +m 2 is an integer of 2 to 400, R 1 is selected from the group consisting of an alkylene group having 1 to 10 carbon atoms, R 2 and R 3 are independently selected from the group consisting of: a monovalent organic group having 1 to 10 carbon atoms including at least one of an alkyl group, an aryl group, an alkoxy group, and an epoxy group; a monovalent organic group having 1 to 10 carbon atoms including a carboxyl group; and a polyalkylene ether group having 3 to 500 carbon atoms, and R 4 is selected from the group consisting of a divalent hydrocarbon group having 1 to 10 carbon atoms; the release agent (G) comprises a metallic soap having a structure represented by formula (1-1): (R 0 —COO) q M 1 (1-1) wherein R 0 is a substituent selected from the group consisting of: a monovalent organic group having 3 to 50 carbon atoms including at least one of an alkyl group, an aryl group, an alkoxy group, and an epoxy group; a monovalent organic group having 3 to 50 carbon atoms including a carboxyl group; and a polyalkylene ether group having 3 to 500 carbon atoms, M 1 is a metal element selected from the group consisting of: third period elements; Group IIA alkaline earth metal elements; and metal elements belonging to Groups IVB, IIB, VIII, IB, IIIA, IIIB, and IVA; and q is an integer of 1 to 4; and the resin composition, after curing, has a diffuse reflectance of at least 80% at a light wavelength of 400 nm; and the resin composition is possible to perform transfer molding at least 100 times continuously.