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This invention relates to a resin composition containing an aromatic episulfide which exhibits excellent moldability, heat resistance and optical properties. The composition comprises an aromatic episulfide compound (A) having two or more reactive groups represented by the following formula (1)(wher

This invention relates to a resin composition containing an aromatic episulfide which exhibits excellent moldability, heat resistance and optical properties. The composition comprises an aromatic episulfide compound (A) having two or more reactive groups represented by the following formula (1)(wherein X is O or S with S accounting for 50 mol % or more of X on the average and R 1 -R 4 are independently hydrogen, halogen or an alkyl group with 1-4 carbon atoms) in its molecule, a glycidyl compound (B) composed of an aromatic glycidyl ether compound having two or more glycidyl groups in its molecule or a glycidyl ester compound having two or more glycidyl groups in its molecule, an acid anhydride (C) and a curing catalyst (D) as essential components and shows the following molar ratios of β-epithiopropyl group (a), glycidyl group (b) and acid anhdyride group (c); [(b)+(a)]/(c)=1.35-3.5, (a)/(c)=0.5-2.2 and (b)/(c)=0.5-1.9.

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1. A resin composition containing an aromatic episulfide which comprises an aromatic episulfide compound (component A) having two or more reactive groups represented by the following formula (1)(wherein X is an oxygen atom or a sulfur atom with sulfur atom accounting for 50 mol % or more of X on the

1. A resin composition containing an aromatic episulfide which comprises an aromatic episulfide compound (component A) having two or more reactive groups represented by the following formula (1)(wherein X is an oxygen atom or a sulfur atom with sulfur atom accounting for 50 mol % or more of X on the average and R 1 -R 4 are independently a hydrogen atom, a halogen atom or an alkyl group with 1-4 carbon atoms) in its molecule, at least one kind of glycidyl compound (component B) selected from an aromatic glycidyl ether compound (B1) having two or more glycidyl groups in its molecule and a glycidyl ester compound (B2) having two or more glycidyl groups in its molecule, an acid anhydride (component C) and a curing catalyst (component D) as essential components and satisfies the following criteria regarding the ratio of functional groups in components A, B and C and the amounts of the components; the molar ratio of the acid anhydride group to the total of the glycidyl and β-epithiopropyl groups is 1 to 1.5-3.2, the molar ratio of the acid anhydride group to the β-epithiopropyl group is 1 to 0.5-2.2, the molar ratio of the acid anhydride group to the glycidyl group is 1 to 0.5-1.9, the amount of component D is 0.01-5 parts by weight per 100 parts by weight of the total of components A, B and C, and the cumulative amount of components A, B, C and D is 80 wt % or more of said resin composition;wherein at least one of components B and C is a liquid, andwherein a thioester compound or a mercaptan compound is incorporated as an initiator in an amount of 0.01-5 parts by weight per 100 parts by weight of the total of components A, B and C. 2. A resin composition containing an aromatic episulfide as described in claim 1 wherein the glycidyl compound (component B) is a liquid aromatic glycidyl ether compound (B1) having two or more glycidyl groups in its molecule and/or a liquid glycidyl ester compound (B2) having two or more glycidyl groups in its molecule, the acid anhydride (component C) is a liquid acid anhydride, and the molar ratio of the acid anhydride group to the glycidyl group is 1 to 0.5-1.6. 3. An optical material which is obtained by curing the resin composition containing an aromatic episulfide described in claim 1 and exhibits a refractive index of 1.5 or more and a water absorption (saturated water absorption at 85° C. and 85% RH) of 1% or less.