Fluororesin and riser pipe

Patent metadata

Field	Value
Publication number	US-9725534-B2
Application number	US-201414581157-A
Country	US
Kind code	B2
Filing date	Dec 23, 2014
Priority date	Mar 23, 2009
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An object of the present invention it to provide a novel fluororesin that has excellent mechanical strength and chemical resistance, and very low permeability at high temperature. The fluorine resin is a copolymer that includes copolymerized units derived from tetrafluoroethylene, vinylidene fluoride, and an ethylenically unsaturated monomer other than tetrafluoroethylene and vinylidene fluoride. The fluororesin has a storage modulus E′, as measured at 170° C. by a dynamic viscoelasticity analysis, in the range of 60 to 400 MPa.

First claim

The invention claimed is:

1. A fluororesin comprising
a copolymer that comprises copolymerized units derived from tetrafluoroethylene, vinylidene fluoride, and an ethylenically unsaturated monomer other than tetrafluoroethylene and vinylidene fluoride,
wherein the fluororesin has a storage modulus E′, as measured at 170° C. by a dynamic viscoelasticity analysis, in the range of 60 to 400 MPa, and a melting point of 216 to 290° C., and
wherein the copolymer comprises 55.0 to 90.0 mol % of copolymerized units derived from tetrafluoroethylene, 5.0 to 44.9 mol % of copolymerized units derived from vinylidene fluoride, and 0.1 to 10.0 mol % of copolymerized units derived from an ethylenically unsaturated monomer other than tetrafluoroethylene and vinylidene fluoride, the ethylenically unsaturated monomer being represented by the formula (1):
CX 1 X 2 ═CX 3 (CF 2 ) n X 4

wherein X 1 , X 2 , X 3 , and X 4 , which may be the same or different, each represent H, F, or Cl, and n is an integer of 0 to 8.

2. A pipe produced from the fluororesin according to claim 1 .

3. A riser pipe comprising a pipe that is produced from the fluororesin according to claim 1 .

4. A fluororesin comprising
a copolymer that comprises copolymerized units derived from tetrafluoroethylene, vinylidene fluoride, and an ethylenically unsaturated monomer other than tetrafluoroethylene and vinylidene fluoride,
wherein the fluororesin has a storage modulus E′, as measured at 170° C. by a dynamic viscoelasticity analysis, in the range of 60 to 400 MPa, and a melting point of 221 to 290° C., and
wherein the copolymer comprises 55.0 to 90.0 mol % of copolymerized units derived from tetrafluoroethylene, 9.2 to 44.2 mol % of copolymerized units derived from vinylidene fluoride, and 0.1 to 0.8 mol % of copolymerized units derived from an ethylenically unsaturated monomer represented by the formula (2):
CF 2 ═CF—ORf 1

wherein Rf 1 represents a C 1-3 alkyl group or a C 1-3 fluoro alkyl group.

5. A pipe produced from the fluororesin according to claim 4 .

6. A riser pipe comprising a pipe that is produced from the fluororesin according to claim 4 .

Assignees

• Daikin Ind Ltd

Inventors

• Kitahara Takahiro
• Kawabe Takuma

Classifications

• Y10T428/1393

  Multilayer [continuous layer] · CPC title

• Y10T428/139

  Open-ended, self-supporting conduit, cylinder, or tube-type article · CPC title

• F16L11/081

  comprising one or more layers of a helically wound cord or wire (in combination with braided layers F16L11/088) · CPC title

• C08F214/225

  with non-fluorinated comonomers · CPC title

• C08F14/04

  Monomers containing two carbon atoms · CPC title