Resin composition and resin molded article

1. A resin composition comprising:

a cellulose acylate (A) selected from the group consisting of cellulose acetate propionate, cellulose acetate butyrate and combinations thereof;

a thermoplastic elastomer (B) comprising a polymer having a core shell structure; and

a fiber (C) chosen from cellulose fiber, kenaf fiber, glass fiber, carbon fiber, polyester fiber, polyamide fiber, aramid fiber, polyurethane fiber, acrylic fiber, vinylon fiber, polyethylene fiber, or combinations thereof, wherein the fiber (C) has an average fiber length from 1 to 10 mm;

wherein the content of cellulose acylate (A) and thermoplastic elastomer (B) satisfy a relationship where the weight ratio (B)/{(A)+(B)} is from 0.1 to 0.3;

wherein the content of cellulose acylate (A), thermoplastic elastomer (B) and fiber (C) satisfy a relationship where the weight ratio (C)/{(A)+(B)+(C)} is from 0.2 to 0.6; and

wherein the resin composition has a tensile elastic modulus of 3000 MPa or more, measured by performing a tensile test in accordance with ISO 527:2012 using an ISO multipurpose test piece molded from said resin composition.

2. The resin composition according to claim 1 , wherein the cellulose acylate (A) is cellulose acetate propionate.

3. The resin composition according to claim 1 , wherein the thermoplastic elastomer (B) comprises a polymer (b1) having a core-shell structure including a core layer and a shell layer containing a polymer of an alkyl (meth)acrylate on a surface of the core layer.

4. The resin composition according to claim 1 , wherein the fiber (C) contains a fiber having a hydroxy group on a surface of the fiber.

5. The resin composition according to claim 1 , wherein the fiber (C) contains at least one selected from the group consisting of a glass fiber and a cellulose fiber, and wherein the fiber (C) has an average fiber length from 1 to 5 mm.

6. The resin composition according to claim 1 , wherein a content of the cellulose acylate (A), a content of the thermoplastic elastomer (B), and a content of the fiber (C) satisfy a relationship 0.5≤(C)/{(A)+(B)+(C)}≤0.6 in terms of mass.

7. The resin composition according to claim 1 , wherein the content of the cellulose acylate (A) and the content of the thermoplastic elastomer (B) satisfy a relationship 0.1≤(B)/{(A)+(B)}0.25 in terms of mass.

8. The resin composition according to claim 1 , further comprising a cardanol compound (D).

9. The resin composition according to claim 8 , wherein the cardanol compound (D) contains a cardanol compound having a molecular weight of 500 or less.

10. The resin composition according to claim 8 , wherein the content of the cellulose acylate (A) and a content of the cardanol compound (D) satisfy a relationship 0.02≤(D)/{(A)+(D)}≤0.2 in terms of mass.

11. The resin composition according to claim 1 , wherein the resin composition has a tensile strength of more than 55 MPa, measured by performing a tensile test in accordance with ISO 527:2012 using an ISO multipurpose test piece molded from said resin composition.

12. The resin composition according to claim 1 , wherein the resin composition has a tensile strength of more than 65 MPa, measured by performing a tensile test in accordance with ISO 527:2012 using an ISO multipurpose test piece molded from said resin composition.

13. A resin molded article comprising the resin composition according to claim 1 .

14. The resin molded article according to claim 13 , being an injection molding article.

15. The resin molded article according to claim 13 , having a tensile elastic modulus of 3500 MPa or more.

16. The resin molded article according to claim 15 , wherein the fiber (C) is glass fiber having an average fiber length from 1 to 3 mm, and wherein the molded article has a tensile strength of from 80 to 121 MPa.