Modified fluorine-containing copolymer, fluorine resin molded article, and method for manufacturing fluorine resin molded article

Patent metadata

Field	Value
Publication number	US-10731015-B2
Application number	US-201314412525-A
Country	US
Kind code	B2
Filing date	Jul 4, 2013
Priority date	Jul 5, 2012
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The present invention aims to provide a modified fluorine-containing copolymer excellent in crack resistance, a fluororesin molded article, and a method of producing a fluororesin molded article. The present invention includes a modified fluorine-containing copolymer consisting only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units. The copolymer is modified by irradiation with radiation at an irradiation temperature not higher than the melting point of the copolymer but not lower than 200° C.

First claim

The invention claimed is:

1. A modified fluorine-containing copolymer consisting only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units,
the copolymer being modified by irradiation with radiation at an irradiation temperature that is 27° C. or more lower than the melting point of the copolymer but not lower than 230° C. and an irradiation dose of 20 kGy to 200 kGy,
wherein the copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units contains the perfluoro(alkyl vinyl ether) units in an amount of 0.1 to 12% by mass based on all the monomer units,
wherein the perfluoro(alkyl vinyl ether) is perfluoro(alkyl vinyl ether) represented by Formula (1′):
CF 2 ═CFO—R f   (1′)

wherein R f represents a C1 to C5 perfluoroalkyl group.

2. A fluororesin molded article comprising:
the modified fluorine-containing copolymer according to claim 1 .

3. A fluororesin molded article obtained by a method of producing a molded article, the method comprising:
molding a copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units; and
irradiating the molded copolymer with radiation at an irradiation temperature that is 27° C. or more lower than the melting point of the copolymer but not lower than 230° C. and an irradiation dose of 20 kGy to 200 kGy,
wherein the copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units contains the perfluoro(alkyl vinyl ether) units in an amount of 0.1 to 12% by mass based on all the monomer units,
wherein the perfluoro(alkyl vinyl ether) is perfluoro(alkyl vinyl ether) represented by Formula (1′):
CF 2 ═CFO—R f   (1′)

wherein R f represents a C1 to C5 perfluoroalkyl group, and
wherein the fluororesin molded article has a thickness of 0.01 to 10 mm.

4. The fluororesin molded article according to claim 3 ,
wherein the molding is performed by compression molding, injection molding, or extrusion molding.

5. The fluororesin molded article according to claim 2 ,
wherein the fluororesin molded article is a sheet.

6. The fluororesin molded article according to claim 2 ,
wherein the copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units has a melting point of 280° C. to 322° C.

7. The fluororesin molded article according to claim 2 ,
wherein the perfluoro(alkyl vinyl ether) is perfluoro(propyl vinyl ether).

8. A method of producing a fluororesin molded article, the method comprising:
molding a copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units; and
irradiating the molded copolymer with radiation at an irradiation temperature that is 27° C. or more lower than the melting point of the copolymer but not lower than 230° C. and an irradiation dose of 20 kGy to 200 kGy,
wherein the copolymer that consists only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units contains the perfluoro(alkyl vinyl ether) units in an amount of 0.1 to 12% by mass based on all the monomer units,
wherein the perfluoro(alkyl vinyl ether) is perfluoro(alkyl vinyl ether) represented by Formula (1′):
CF 2 ═CFO—R f   (1′)

wherein R f represents a C1 to C5 perfluoroalkyl group, and
wherein the fluororesin molded article has a thickness of 0.01 to 10 mm.

Assignees

• Daikin Ind Ltd

Inventors

• Sawaki Kyouhei
• Kono Hideki
• Imamura Hitoshi
• Aoyama Takahisa
• Sukegawa Masamichi

Classifications

• C08J2327/16

  Homopolymers or copolymers of vinylidene fluoride · CPC title

• B29C35/08

  by wave energy or particle radiation {(B29C64/00, B29C71/04 take precedence)} · CPC title

• C08J3/28

  Treatment by wave energy or particle radiation · CPC title

• C08J7/123 Primary

  Treatment by wave energy or particle radiation (C08J7/18 takes precedence) · CPC title

• B29K2027/12

  containing fluorine · CPC title