Resin composition and resin molded article
Provided is a resin composition containing: a resin (A) having a biomass-derived carbon atom; a resin (B) incompatible with the resin (A); and a plasticizer (C), in which a content of the resin (A) is larger than a content of the resin (B), and a glass transition temperature Tg (A) of the resin (A) is higher than a glass transition temperature Tg (B) of the resin (B).
1. A resin composition comprising:
a resin (A) having a biomass-derived carbon atom;
a resin (B) incompatible with the resin (A); and
a plasticizer (C),
wherein a content of the resin (A) is larger than a content of the resin (B), and a glass transition temperature T g(A) of the resin (A) is higher than a glass transition temperature T g(B) of the resin (B),
wherein a difference (T g(A) −T g(A+C) ) between the glass transition temperature T g(A) of the resin (A) and a glass transition temperature T g(A+C) of a mixture obtained by mixing 10 parts by mass of the plasticizer (C) with 90 parts by mass of the resin (A) is 25° C. to 60° C., and
a difference (T g(B) −T g(B+C) ) between the glass transition temperature T g(B) of the resin (B) and a glass transition temperature T g(B+C) of a mixture obtained by mixing 10 parts by mass of the plasticizer (C) with 90 parts by mass of the resin (B) is 15° C. to 40° C.
2. The resin composition according to claim 1 ,
wherein the content of the biomass-derived carbon atom in the resin composition defined in ASTM D6866:2012 is 30 mass % or more based on a total amount of carbon atoms in the resin composition.
3. The resin composition according to claim 2 ,
wherein the resin (A) is at least one selected from the group consisting of a cellulose acylate and an aliphatic polyester.
4. The resin composition according to claim 3 ,
wherein the resin (A) is at least one selected from the group consisting of cellulose acetate propionate and cellulose acetate butyrate.
5. The resin composition according to claim 1 ,
wherein the resin (A) is at least one selected from the group consisting of a cellulose acylate and an aliphatic polyester.
6. The resin composition according to claim 5 ,
wherein the resin (A) is at least one selected from the group consisting of cellulose acetate propionate and cellulose acetate butyrate.
7. The resin composition according to claim 1 ,
wherein the resin (A) comprises at least a cellulose acylate and the resin (B) comprises at least a polylactic acid.
8. The resin composition according to claim 1 ,
wherein a mass ratio (A)/(B) of the resin (A) to the resin (B) is 95/5 to 70/30.
9. The resin composition according to claim 1 ,
wherein a mass ratio (A)/(C) of the resin (A) to the plasticizer (C) is 97/3 to 75/25.
10. The resin composition according to claim 1 ,
wherein a mass ratio (A)/(C) of the resin (B) to the plasticizer (C) is 86/14 to 25/75.
11. The resin composition according to claim 1 ,
wherein the plasticizer (C) comprises at least one selected from the group consisting of a cardanol compound, a dicarboxylic acid diester, a citrate ester, a polyether compound having at least one unsaturated bond in the molecule, a polyetherester compound, a glycol benzoate, a compound represented by the following general formula (6) and an epoxidized fatty acid ester,
wherein, in the general formula (6),
R 61 represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms, and
R 62 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms.
12. A resin molded article, comprising the resin composition according to claim 1 .
13. The resin molded article according to claim 12 ,
wherein the resin molded article is an injection molded article.