Resin tube
Provided is a resin tube containing a poly(3-hydroxyalkanoate) resin component. The poly(3-hydroxyalkanoate) resin component includes at least two poly(3-hydroxyalkanoate) resins differing in types and/or contents of constituent monomers. A 50% fracture energy of the resin tube, as measured by an impact resistance test, is 0.2 J or more.
1. A resin tube comprising a poly(3-hydroxyalkanoate) resin component, wherein
the poly(3-hydroxy alkanoate) resin component comprises at least two poly(3-hydroxyalkanoate) resins differing in types and/or contents of constituent monomers, and
a 50% fracture energy of the resin tube, as measured by an impact resistance test, is at least 0.2 J.
2. The resin tube according to claim 1 , wherein the poly(3-hydroxyalkanoate) resin component comprises a copolymer of 3-hydroxy butyrate units and other hydroxyalkanoate units.
3. The resin tube according to claim 2 , wherein the poly(3-hydroxyalkanoate) resin component comprises:
a copolymer (A) comprising 3-hydroxybutyrate units and other hydroxyalkanoate units, wherein a content of the other hydroxyalkanoate units in the copolymer (A) is from 1 mol % to 6 mol %; and
a copolymer (B) comprising 3-hydroxybutyrate units and other hydroxyalkanoate units, wherein a content of the other hydroxyalkanoate units in the copolymer (B) is at least 24 mol %.
4. The resin tube according to claim 3 , wherein in the poly(3-hydroxyalkanoate) resin component, a proportion of the copolymer (A) is at least 40 wt %, and a proportion of the copolymer (B) is 60 wt % or less.
5. The resin tube according to claim 2 , wherein an average content of the other hydroxyalkanoate units in total monomer units constituting the poly(3-hydroxyalkanoate) resin component is from 5 mol % to 18 mol %.
6. The resin tube according to claim 2 , wherein the other hydroxyalkanoate units are 3-hydroxyhexanoate units.
7. The resin tube according to claim 1 , wherein a wall thickness of the resin tube is from 0.01 mm to 0.6 mm.
8. The resin tube according to claim 1 , wherein a wall thickness of the resin tube is from 0.7 mm to 10 mm.
9. The resin tube according to claim 5 , wherein the average content of the other hydroxyalkanoate units in total monomer units constituting the poly(3-hydroxyalkanoate) resin component is from 6 mol % to 17 mol %.
10. The resin tube according to claim 5 , wherein the average content of the other hydroxyalkanoate units in total monomer units constituting the poly(3-hydroxyalkanoate) resin component is from 7 mol % to 16 mol %.
11. The resin tube according to claim 4 , wherein, in the poly(3-hydroxyalkanoate) resin component, the proportion of the copolymer (A) is from 40 to 95 wt %, and the proportion of the copolymer (B) is from 5 wt % to 60 wt %.
12. The resin tube according to claim 4 , wherein, in the poly(3-hydroxyalkanoate) resin component, the proportion of the copolymer (A) is from 45 to 80 wt %, and the proportion of the copolymer (B) is from 20 wt % to 55 wt %.
13. The resin tube according to claim 1 , wherein a weight-average molecular weight of the poly(3-hydroxyalkanoate) resin component is from 20×10 4 to 200×10 4 .
14. The resin tube according to claim 1 , wherein the resin tube comprises at least one additional resin in addition to the at least two poly(3-hydroxyalkanoate) resins.
15. The resin tube according to claim 14 , wherein the additional resin is at least one selected from the group consisting of an aliphatic polyester resin and aliphatic-aromatic polyester resin.
16. The resin tube according to claim 14 , wherein a content of the at least one additional resin is 30 parts by weight or less per 100 parts by weight of the total amount of the poly(3-hydroxyalkanoate) resin component.
17. The resin tube according to claim 3 , wherein the content of the other hydroxyalkanoate units in the copolymer (B) is from 24 mol % to 99 mol %.