Resin composition and resin molded article
A resin composition includes a polycarbonate-based resin and a polyethylene terephthalate resin, and the resin composition has a resin phase-separated structure including a continuous phase containing the polycarbonate-based resin and a dispersed phase containing the polyethylene terephthalate resin, in which a number average diameter in a longitudinal direction of the dispersed phase is 1.5 μm or less, a number average diameter in a lateral direction of the dispersed phase is 0.8 μm or less, and an aspect ratio of the number average diameter in the longitudinal direction to the number average diameter in the lateral direction is 2.5 or less.
1. A resin composition, comprising:
a resin component comprising:
a polycarbonate-based resin; and
a polyethylene terephthalate resin;
an organic phosphorus flame retardant; and
a flame retardant anti-dripping agent,
the resin composition having:
a resin phase-separated structure including a continuous phase containing the polycarbonate-based resin and a dispersed phase containing the polyethylene terephthalate resin,
wherein:
a number average diameter in a longitudinal direction of the dispersed phase is 1.5 μm or less,
a number average diameter in a lateral direction of the dispersed phase is 0.8 μm or less,
an aspect ratio of the number average diameter in the longitudinal direction to the number average diameter in the lateral direction is 2.5 or less, and
a content of the flame retardant anti-dripping agent is 0.3 part by mass or more and 0.8 part by mass or less based on 100 parts by mass of the resin component.
2. The resin composition according to claim 1 , wherein the number average diameter in the longitudinal direction of the dispersed phase is 0.5 μm or more and 1.3 μm or less.
3. The resin composition according to claim 1 , wherein the number average diameter in the lateral direction of the dispersed phase is 0.1 μm or more and 0.6 μm or less.
4. The resin composition according to claim 1 , wherein the organic phosphorus flame retardant contains a condensed phosphate.
5. The resin composition according to claim 2 , wherein the organic phosphorus flame retardant contains a condensed phosphate.
6. The resin composition according to claim 3 , wherein the organic phosphorus flame retardant contains a condensed phosphate.
7. The resin composition according to claim 1 , wherein the flame retardant anti-dripping agent contains a fluorine-containing resin.
8. The resin composition according to claim 2 , wherein the flame retardant anti-dripping agent contains a fluorine-containing resin.
9. The resin composition according to claim 3 , wherein the flame retardant anti-dripping agent contains a fluorine-containing resin.
10. The resin composition according to claim 7 , wherein the fluorine-containing resin contains polytetrafluoroethylene (PTFE).
11. The resin composition according to claim 1 , wherein a content of the organic phosphorus flame retardant is 1 part by mass or more and 25 parts by mass or less based on 100 parts by mass of the resin component.
12. The resin composition according to claim 1 , wherein a content of the polycarbonate-based resin is 40 parts by mass or more and 90 parts by mass or less based on 100 parts by mass of the resin component.
13. The resin composition according to claim 1 , wherein a content of the polyethylene terephthalate resin is 10 parts by mass or more and 40 parts by mass or less based on 100 parts by mass of the resin component.
14. The resin composition according to claim 1 , wherein
when a value of ½ of the number average diameter R LONG in the longitudinal direction of the dispersed phase is substituted for r i in the following Equation (A), a value of a specific surface area A represented by the following Equation (A) is 2.0 or more, and
when a value of ½ of the number average diameter R SHORT in the lateral direction of the dispersed phase is substituted for r i in the following Equation (A), the value of the specific surface area A represented by the following Equation (A) is 7.0 or more,
A
=
∑
i
N
×
4
π
r
i
2
∑
i
N
×
4
π
r
i
3
3
(
A
)
[in the Equation (A), A represents the specific surface area of the dispersed phase, N represents the number of the dispersed phase in an observation visual field, and r i represents a radius of an i-th dispersed phase].
15. A resin molded article comprising: the resin composition according to claim 1 .
16. The resin molded article according to claim 13 , which is an injection molded article.
17. The resin composition according to claim 1 , wherein the resin component further comprises a glycidyl group-containing polyethylene-based copolymer.
18. The resin composition according to claim 1 , wherein the resin component further comprises a methyl methacrylate-butadiene-styrene copolymer.
19. The resin composition according to claim 1 , wherein the resin component consists of the polycarbonate-based resin and the polyethylene terephthalate resin.