Resin composition and molded product thereof, and method for their production

1. A resin composition comprising:

a polylactic acid resin;

an impact-resistant resin which is superior in impact resistance to said polylactic acid resin and is incompatible with or hardly compatible with said polylactic acid resin; and

a nucleating agent that promotes crystallization of said polylactic acid resin, wherein,

said nucleating agent is compatible with said impact-resistant resin and exists at least in the phase of said impact-resistant resin, and

the nucleating agent is copper phthalocyanine.

2. The resin composition as defined in claim 1 , wherein said impact-resistant resin has a flexural modulus of elasticity not higher than 300 MPa at 30° C.

3. The resin composition as defined in claim 1 , wherein said impact-resistant resin has a glass transition point not higher than 0° C.

4. The resin composition as defined in claim 1 , wherein said impact-resistant resin is at least one species selected from the group consisting of polybutylene succinate, polybutylene succinate adipate, polybutylene terephthalate, polybutylene adipate terephthalate, polymer of aliphatic polyester of polylactic acid, copolymer of polylactic acid and diol-dicarboxylic acid, polyamide resin, acrylonitrile-buta-diene-styrene copolymer, polyethylene resin, and polypropylene resin.

5. The resin composition as defined in claim 1 , wherein said impact-resistant resin accounts for 5 to 50 mass % in the total amount of the resin components of the resin composition and said nucleating agent accounts for 0.01 to 10 mass % of the resin composition, with the remainder being substantially said polylactic acid resin.

6. The resin composition as defined in claim 1 , further comprising

additives in an amount of 0.1 to 50 mass % of the resin composition.

7. A molded product formed from the resin composition, the resin composition including:

a polylactic acid resin;

an impact-resistant resin which is superior in impact resistance to said polylactic acid resin and is incompatible with or hardly compatible with said polylactic acid resin; and

a nucleating agent that promotes crystallization of said polylactic acid resin,

wherein said nucleating agent is compatible with said impact-resistant resin, and exists at least in the phase of said impact-resistant resin, and

the nucleating agent is copper phthalocyanine.

8. A method for producing a resin composition, said method comprising the step of

melt-mixing a polylactic acid resin, an impact-resistant resin that is superior in impact resistance to said polylactic acid resin and is incompatible with or hardly compatible with said polylactic acid resin, and a nucleating agent which promotes crystallization of said polylactic acid resin, said nucleating agent being compatible with said impact-resistant resin and existing at least in the phase of said impact-resistant resin,

wherein the nucleating agent is copper phthalocyanine.

9. A method for producing a molded product, said method comprising the steps of:

melting a resin composition prepared by a method including the step of

melt-mixing a polylactic acid resin, an impact-resistant resin that is superior in impact resistance to said polylactic acid resin and is incompatible with or hardly compatible with said polylactic acid resin, and a nucleating agent that promotes crystallization of said polylactic acid resin, said nucleating agent being compatible with said impact-resistant resin and existing at least in the phase of said impact-resistant resin; and

forming the resulting melt into a desired shape,

wherein the nucleating agent is copper phthalocyanine.