RESIN COMPOSITION AND RESIN MOLDED BODY
A resin composition contains a cellulose acylate (A), a polyester resin (B), an ester compound (C) having a molecular weight of 250 or more and 2000 or less, and porous inorganic particles (D).
1 . A resin composition comprising:
a cellulose acylate (A);
a polyester resin (B);
an ester compound (C) having a molecular weight of 250 or more and 2000 or less; and
porous inorganic particles (D).
2 . The resin composition according to claim 1 , further comprising at least one polymer (E) 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 including 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 (F) including 50 mass % or more of a structural unit derived from an alkyl (meth)acrylate.
4 . The resin composition according to claim 1 , wherein the cellulose acylate (A) is at least one selected from cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB).
5 . The resin composition according to claim 1 , wherein the polyester resin (B) is a polyhydroxyalkanoate.
6 . The resin composition according to claim 5 , wherein the polyester resin (B) is polylactic acid.
7 . The resin composition according to claim 1 , wherein the ester compound (C) is a fatty acid ester compound.
8 . The resin composition according to claim 7 , wherein the ester compound (C) is an adipic acid ester-containing compound.
9 . The resin composition according to claim 1 , wherein the porous inorganic particles (D) are porous silica particles.
10 . The resin composition according to claim 1 , wherein the porous inorganic particles (D) have a BET specific surface area of 600 m 2 /g or less.
11 . The resin composition according to claim 1 , wherein a mass ratio (B/A) of the polyester resin (B) to the cellulose acylate (A) is 0.05 or more and 0.5 or less.
12 . The resin composition according to claim 1 , wherein a mass ratio (C/A) of the ester compound (C) to the cellulose acylate (A) is 0.02 or more and 0.15 or less.
13 . The resin composition according to claim 1 , wherein a mass ratio (D/A) of the porous inorganic particles (D) to the cellulose acylate (A) is 0.001 or more and 0.1 or less.
14 . A resin molded body comprising the resin composition according to claim 1 .
15 . The resin molded body according to claim 14 , wherein the resin molded body is an injection-molded body.
16 . A resin molded body comprising;
a cellulose acylate (A);
a polyester resin (B); and
an ester compound (C) having a molecular weight of 250 or more and 2000 or less,
wherein a percentage of water absorption represented by the following formula is 1% or more and 6% or less, and a percentage of dimensional change due to release of water represented by the following formula is 0% or more and 0.7% or less at time (T 0 ), which is a time point after the resin molded body is allowed to stand in a bone-dry environment at 25° C. for 24±1 hours, at time (T 1 ), which is a time point after the resin molded body is subsequently allowed to stand in an aquatic environment at 25° C. for 24±1 hours, and at time (T 2 ), which is a time point after the resin molded body is subsequently allowed to stand in a bone-dry environment at 25° C. for 24±1 hours,
Percentage of water absorption=([ M 1]−[ M 0])/[ M 0]×100
Percentage of dimensional change due to release of water=([ L 1]−[ L 2])/[ L 1]×100
(wherein [M0] represents a mass (g) of the resin molded body at time (T 0 ), and [M1] represents a mass (g) of the resin molded body at time (T 1 ). [L1] represents a mean of a maximum length (m) of the resin molded body in a MD and a maximum length (m) in a TD at time (T 1 ), and [L2] represents a mean of a maximum length (m) of the resin molded body in the MD and a maximum length (m) in the TD at time (T 2 )).