RESIN COMPOSITION AND RESIN MOLDED ARTICLE

1 . A resin composition comprising:

a resin (A) having a biomass-derived carbon atom,

wherein:

a content of the resin (A) in the resin composition is 50% by weight or more with respect to the entire weight of the resin composition, and

a ratio (E′f80/E″f80) of a storage modulus E′f80 to a loss modulus E″f80 at a frequency of 1 Hz and at a temperature of 80° C. is from 5 to 15, in a dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

2 . The resin composition according to claim 1 ,

wherein a content of the biomass-derived carbon atom in the resin composition, which is defined in ASTM D6866:2012, is 30% or more with respect to a total amount of carbon atoms in the resin composition.

3 . 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 resin.

4 . 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 resin.

5 . The resin composition according to claim 3 ,

wherein the resin (A) is at least one selected from the group consisting of a cellulose acetate propionate and a cellulose acetate butyrate.

6 . The resin composition according to claim 4 ,

wherein the resin (A) is at least one selected from the group consisting of a cellulose acetate propionate and a cellulose acetate butyrate.

7 . The resin composition according to claim 3 ,

wherein the resin (A) is a polyhydroxyalkanoate.

8 . The resin composition according to claim 4 ,

wherein the resin (A) is a polyhydroxyalkanoate.

9 . The resin composition according to claim 1 , further comprising:

a plasticizer (B); and

a compound (C) that is at least one selected from the group consisting of a hindered phenol compound, a tocopherol compound, a tocotrienol compound, a phosphite compound, and a hydroxylamine compound,

wherein the resin (A) is a cellulose acylate.

10 . The resin composition according to claim 2 , further comprising:

a plasticizer (B); and

a compound (C) that is at least one selected from the group consisting of a hindered phenol compound, a tocopherol compound, a tocotrienol compound, a phosphite compound, and a hydroxylamine compound,

wherein the resin (A) is a cellulose acylate.

11 . The resin composition according to claim 1 ,

wherein the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. is from 6.5 to 13, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

12 . The resin composition according to claim 2 ,

wherein the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. is from 6.5 to 13, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

13 . The resin composition according to claim 1 ,

wherein a ratio (E′f90/E″f90) of a storage modulus E′f90 to a loss modulus E″f90 at a frequency of 1 Hz and at a temperature of 90° C. is from 3 to 12, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

14 . The resin composition according to claim 2 ,

wherein a ratio (E′f90/E″f90) of a storage modulus E′f90 to a loss modulus E″f90 at a frequency of 1 Hz and at a temperature of 90° C. is from 3 to 12, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

15 . The resin composition according to claim 1 ,

wherein a value [(E′f80/E″f80)/(E′f90/E″f90)] of the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. with respect to a ratio (E′f90/E″f90) of a storage modulus E′f90 to a loss modulus E″f90 at a frequency of 1 Hz and at a temperature of 90° C. is from 1.15 to 1.35, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

16 . The resin composition according to claim 2 ,

wherein a value [(E′f80/E″f80)/(E′f90/E″f90)] of the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. with respect to a ratio (E′f90/E″f90) of a storage modulus E′f90 to a loss modulus E″f90 at a frequency of 1 Hz and at a temperature of 90° C. is from 1.15 to 1.35, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

17 . The resin composition according to claim 1 ,

wherein a value [(E′f25/E″f25)/(E′f80/E″f80)] of a ratio (E′f25/E″f25) of a storage modulus E′f25 to a loss modulus E″f25 at a frequency of 1 Hz and at a temperature of 25° C. with respect to the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. is from 1.4 to 3.5, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

18 . The resin composition according to claim 2 ,

wherein a value [(E′f25/E″f25)/(E′f80/E″f80)] of a ratio (E′f25/E″f25) of a storage modulus E′f25 to a loss modulus E″f25 at a frequency of 1 Hz and at a temperature of 25° C. with respect to the ratio (E′f80/E″f80) of the storage modulus E′f80 to the loss modulus E″f80 at the frequency of 1 Hz and at the temperature of 80° C. is from 1.4 to 3.5, in the dynamic viscoelasticity measurement defined in JIS K7244-3:1999.

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

20 . The resin molded article according to claim 19 that is an injection molded article.

21 . The resin composition according to claim 1 ,

wherein the resin (A) is at least one resin selected from the group consisting of cellulose acylate, biomass-derived polyester, biomass-derived polyolefin, biomass-derived polyethylene terephthalate, biomass-derived polyamide, polytrimethylene terephthalate (PTT), polybutylene succinate (PBS), phosphatidylglycerol (PG), an isosorbide polymer, and an acrylic acid modified rosin.