Heat-shrinkable tube having tearability

Patent metadata

Field	Value
Publication number	US-9464149-B2
Application number	US-201514927572-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Feb 1, 2015
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

The present disclosure relates to a heat-shrinkable tube having tearability, which is made of a fluororesin, and particularly, to a heat-shrinkable tube having excellent tear straightness. Further, the present disclosure relates to a tube having high heat-shrinkage rate at low temperature. A tube including at least a fluororesin as a base resin, in which the thickness of the entanglement unit of a polymer observed on a cross-section in a longitudinal direction of the tube after being shrunk at 200° C. by 35% or more is 1 μm to 9 μm, has excellent tear straightness.

First claim

The invention claimed is:

1. A heat-shrinkable tube having tearability, comprising at least a fluororesin as a base resin,
wherein the tube has a shrinkage rate of 35% or more when heated at 200° C., and a thickness of an entanglement unit of a polymer observed on a cross-section in a longitudinal direction of the tube after being shrunk at 200° C. by 35% or more is 1 μm to 9 μm.

2. The tube of claim 1 , wherein the tube has an outer diameter of 1.39 mm.

3. The tube of claim 1 , wherein the tube has a shrinkage rate of 40% or more when heated at 200° C., and a thickness of an entanglement unit of a polymer observed on a cross-section in a longitudinal direction of the tube after being shrunk at 200° C. by 40% or more is 1 μm to 9 μm.

4. The tube of claim 3 , wherein the fluororesin is a copolymer comprising tetrafluoroethylene and hexafluoropropylene as constituent monomers.

5. The tube of claim 3 , wherein a ratio exhibiting tear straightness is in a range between 50% to 50% and 48% to 52%.

6. The tube of claim 3 , wherein the tube has an outer diameter of 1.39 mm.

7. The tube of claim 1 , wherein the fluororesin is a copolymer comprising tetrafluoroethylene and hexafluoropropylene as constituent monomers.

8. The tube of claim 7 , wherein a ratio exhibiting tear straightness is in a range between 50% to 50% and 48% to 52%.

9. The tube of claim 7 , wherein the tube has an outer diameter of 1.39 mm.

10. The tube of claim 1 , wherein a ratio exhibiting tear straightness is in a range between 50% to 50% and 48% to 52%.

11. The tube of claim 10 , wherein the tube has an outer diameter of 1.39 mm.

12. A heat-shrinkable tube having tearability, comprising at least a fluororesin as a base resin,
wherein the tube has a shrinkage rate of 44% or more when heated at 200° C., and a thickness of an entanglement unit of a polymer observed on a cross-section in a longitudinal direction of the tube after being shrunk at 200° C. by 44% or more is 1 μm to 9 μm.

13. The tube of claim 12 , wherein the fluororesin is a copolymer comprising tetrafluoroethylene and hexafluoropropylene as constituent monomers.

14. The tube of claim 12 , wherein a ratio exhibiting tear straightness is in a range between 50% to 50% and 48% to 52%.

15. The tube of claim 12 , wherein the tube has an outer diameter of 1.39 mm.

Assignees

• Junkosha Inc

Inventors

• Suzuki Masahiro
• YURI Kohei
• Okubo Tomoyo

Classifications

• F16L11/04

  made of rubber or flexible plastics · CPC title

• B29K2995/0049

  Heat shrinkable · CPC title

• B29C48/09

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title

• B29C63/42

  using tubular layers or sheathings · CPC title

• B29C61/08

  by stretching tubes {(in general B29C55/22, B29C55/28)} · CPC title