Resin composition and resin molded body

1. A resin composition comprising:

a cellulose acylate (A) having, in a side chain, a group having a hydrocarbon chain with 5 to 24 carbon atoms;

a polyester resin (B); and

an ester compound (C) having a molecular weight of about 250 or more and about 2000 or less,

wherein a mass ratio ((B)/(A)) of the polyester resin (B) to the cellulose acylate (A) is about 0.05 or more and about 0.5 or less, and a mass ratio ((C)/(A)) of the ester compound (C) to the cellulose acylate (A) is about 0.02 or more and about 0.15 or less,

wherein the polyester resin (B) is a polyhydroxyalkanoate, the polyhydroxyalkanoate has a structural unit represented by general formula (PHA),

wherein R PHA1 is a branched alkylene group,

wherein an amount of the group having a hydrocarbon chain with 5 to 24 carbon atoms is from 0.15 groups to 2.5 groups on a number basis per glucose unit, and

wherein the group having the hydrocarbon chain with 5 to 24 carbon atoms is selected from the group consisting of a cardanol-derived group, an acyl group having 5 to 24 carbon atoms, and an unsubstituted alkyl group having 5 to 24 carbon atoms, wherein

the hydrocarbon chain with 5 to 24 carbon atoms of the cardanol-derived group is an unsubstituted alkyl group, and

the hydrocarbon chain with 5 to 24 carbon atoms of the acyl group is a combination of a carbonyl group and an unsubstituted alkyl group.

2. The resin composition according to claim 1 , further comprising at least one polymer (D) selected from:

a core-shell structure polymer having: a core layer, and a shell layer formed on a surface of the core layer and containing an alkyl (meth)acrylate polymer, and

an olefin polymer containing about 60 mass% or more of a structural unit derived from α-olefin.

3. The resin composition according to claim 1 , further comprising a poly(meth)acrylate compound (E) including about 50 mass% or more of a structural unit derived from an alkyl (meth)acrylate.

4. The resin composition according to claim 1 , wherein the polyester resin (B) is polylactic acid.

5. The resin composition according to claim 1 , wherein the ester compound (C) is a fatty acid ester compound.

6. The resin composition according to claim 5 , wherein the ester compound (C) is an adipic acid ester-containing compound.

7. A resin molded body comprising the resin composition according to claim 1 .

8. The resin molded body according to claim 7 , wherein the resin molded body is an injection-molded body.

9. A resin composition comprising:

a cellulose acylate (A) having, in a side chain, a group having a hydrocarbon chain with 5 to 24 carbon atoms;

a polyester resin (B); and

an ester compound (C) having a molecular weight of about 250 or more and about 2000 or less,

wherein a weld-line impact strength is about 10 kJ/m 2 or more, and a value obtained by dividing the weld-line impact strength by a Charpy impact strength is about 0.5 or more,

wherein the polyester resin (B) is a polyhydroxyalkanoate, the polyhydroxyalkanoate has a structural unit represented by general formula (PHA),

wherein R PHA1 is a branched alkylene group,

wherein an amount of the group having a hydrocarbon chain with 5 to 24 carbon atoms is from 0.15 groups to 2.5 groups on a number basis per glucose unit, and

wherein the group having the hydrocarbon chain with 5 to 24 carbon atoms is selected from the group consisting of a cardanol-derived group, an acyl group having 5 to 24 carbon atoms, and an unsubstituted alkyl group having 5 to 24 carbon atoms, wherein

the hydrocarbon chain with 5 to 24 carbon atoms of the cardanol-derived group is an unsubstituted alkyl group, and

the hydrocarbon chain with 5 to 24 carbon atoms of the acyl group is a combination of a carbonyl group and an unsubstituted alkyl group.