Resin composition
A resin composition for molding, added with a nucleating agent suitable for promoting crystallization of a polyester capable of having a crystal structure, and in particular of a biodegradable polyester, and a molded product containing, the resin composition for molding thus improved in the crystallinity has either a cyclic compound expressed by general formula (I): (where each of A 1 , A 2 , A 4 and A 5 commonly or independently expresses —CO— or —NH—, each of A 3 and A 6 commonly or independently expresses hydrogen, halogen, optionally-substituted aliphatic group or optionally-substituted aromatic group) and having both of —CO— and —NH— in the molecule, or a mixture of (i) a cyclic compound having —CO— but no NH in the molecule and (ii) a cyclic compound having no —CO— but NH in the molecule, together with the polyester capable of having a crystal structure.
1. A highly crystallized resin composition comprising a cyclic compound which is any one of 1,4-diketo-2,5-dihydro-3,6-diphenylpyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-chlorophenyl)pyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-methylphenyl)pyrrolo[3,4-c]pyrrole, 1,4-d-iketo-2,5-dihydro-3,6-di-(m-methylphenyl) pyrrolo[3,4-c] pyrrole and 1,4-diketo-2,5-dihydro-3-(p-methylphenyl)-6-(m-methylphenyl)pyrrolo[3,4-c-]pyrrole, together with a polyester capable of having a crystal structure, wherein said polyester is a biodegradable polyester, which is polylactic acid, and wherein a blending ratio of said cyclic compound falls in a range from 0.001 to 0.1 parts by weight per 100 parts by weight of said polyester.
2. The resin composition as described in claim 1 , wherein A 1 represents —CO—, A 2 represents —NH—, A 4 represents —CO—, and A 5 represents −NH—.
3. The resin composition as described in claim 1 , wherein a particle size of said cyclic compound falls in a range not larger than 10 μm.
4. The resin composition as described in claim 1 , wherein said resin composition is adapted for use in molding.
5. The resin composition as described in claim 1 , wherein an inorganic filler is further added.
6. The resin composition as described in claim 5 , wherein said inorganic filler is talc.
7. The resin composition as described in claim 5 , wherein a blending ratio of said inorganic filler falls in a range from 1 to 50 parts by weight per 100 parts by weight of said resin composition for molding.
8. The resin composition as described in claim 1 , further comprising a hydrolysis suppressing agent.
9. The resin composition as described in claim 8 , wherein said hydrolysis suppressing agent contains a compound having a carbodiimide group.
10. A method of promoting the crystallization of a biodegradable polyester comprising a step of mixing a cyclic compound which is any one of 1,4-diketo-2,5-dihydro-3,6-diphenylpyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-chlorophenyl)pyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-methylphenyl)pyrrolo[3,4-c]pyrrole, 1,4-d-iketo-2,5-dihydro-3,6-di-(m-methylphenyl) pyrrolo[3,4-c] pyrrole and 1,4-diketo-2,5-dihydro-3-(p-methylphenyl)-6-(m-methylphenyl)pyrrolo[3,4-c-]pyrrole, together with a polyester capable of having a crystal structure, wherein said polyester is a biodegradable polyester, which is polylactic acid, and wherein a blending ratio of said cyclic compound falls in a range from 0.001 to 0.1 parts by weight per 100 parts by weight of said polyester.
11. A highly crystallized molded product containing a resin composition, said resin composition comprising a cyclic compound which is any one of 1,4-diketo-2,5-dihydro-3,6-diphenylpyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-chlorophenyl)pyrrolo[3,4-c]pyrrole, 1,4-diketo-2,5-dihydro-3,6-di-(p-methylphenyl)pyrrolo[3,4-c]pyrrole, 1,4-d-iketo-2,5-dihydro-3,6-di-(m-methylphenyl) pyrrolo[3,4-c] pyrrole and 1,4-diketo-2,5-dihydro-3-(p-methylphenyl)-6-(m-methylphenyl)pyrrolo[3,4-c-]pyrrole, together with a polyester capable of having a crystal structure, wherein said polyester is a biodegradable polyester, which is polylactic acid, and wherein a blending ratio of said cyclic compound falls in a range from 0.001 to 0.1 parts by weight per 100 parts by weight of said polyester.
12. The molded product as described in claim 11 , wherein said molded product is an enclosure for electric or electronic instruments.