Blends of crosslinking agents for fluoroelastomers

Patent metadata

Field	Value
Publication number	US-11919984-B2
Application number	US-201916969766-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 19, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A curable composition comprising a fluorinated amorphous fluoropolymer, and a blend of polysulfonamide and polyol crosslinking agents.

First claim

What is claimed is:

1. A curable composition comprising a partially fluorinated amorphous fluoropolymer,
an acid acceptor; and
a crosslinking component comprising a blend of a polysulfonamide compound and a fluorinated ether polyol compound,
wherein the polysulfonamide is of the formula R 2 (NH—SO 2 R f 1 ) x , wherein R f 1 is a perfluoroether group of the formula F—R f 3 —O—R f 4 —(R f 5 ) q —, wherein R f 3 represents a perfluoroalkylene group, R f 4 represents a perfluoroalkyleneoxy group, and R f 5 represents a perfluoroalkylene group and q is 0 or 1, wherein R 2 is a partially fluorinated or non-fluorinated group, and subscript x is 2 to 8 wherein the curable composition optionally comprises an organo onium accelerator.

2. The curable composition of claim 1 wherein the partially fluorinated amorphous fluoropolymer comprises carbon-carbon double bonds or is capable of forming carbon-carbon double bonds along the amorphous fluoropolymer.

3. The curable composition of claim 1 , wherein R 2 is a C 2 -C 30 aliphatic, cycloaliphatic, aromatic or alkyl-substituted aromatic hydrocarbyl group of valence x designated as R h 2 .

4. The curable composition of claim 1 wherein R 2 is a fluorinated group of the formula R f 6 (Y—) x —, where R f 6 represents a perfluoroalkylene or perfluoroether group, and Y is a hydrocarbyl group.

5. The curable composition of claim 1 wherein the fluorinated ether polyol is of the formula:
R f 10 —[(CH 2 ) y —OH] x , and conjugate base thereof where
R f 10 represents a perfluoroether group of valence x,
subscript y is 1 to 8; and
subscript x is 2 to 4.

6. The curable composition of claim 1 wherein the fluorinated ether polyol is of the formula
[R f 13 —O—R f 14 —(R f 15 ) q ]—[(CH 2 ) y —OH] x , where
[R f 13 —O—R f 14 —(R f 15 ) q ] has a valence of x from abstraction of two or more F atoms from any of the R f 13 , R f 14 , or R f 15 groups,
R f 13 represents a perfluoroalkylene group,
R f 14 represents a perfluoroalkyleneoxy group,
R f 15 represents a perfluoroalkylene group and q is 0 or 1
subscript y is 1 to 8; and
subscript x is 2 to 4.

7. A molded article comprising the cured compositions of claim 1 .

8. A method of preparing a shaped article comprising the steps of:
providing the curable composition of claim 1 ,
heating said composition to a temperature sufficient to cure the composition; and
recovering the shaped article.

9. A curable composition comprising a partially fluorinated amorphous fluoropolymer,
an acid acceptor; and
a crosslinking component comprising a blend of a polysulfonamide compound and a
fluorinated ether polyol compound,

wherein the polysulfonamide is of the formula:
R h 2 (NH—SO 2 R f 1 ) x , where R f 1 is a non-fluorinated or fluorinated group, R 2 is a partially fluorinated or non-fluorinated group,
subscript x is 2 to 8
R h 2 is a (hetero)hydrocarbyl group, and R f 1 is a perfluoroalkyl or perfluoroether group wherein the curable composition optionally comprises an organo onium accelerator.

10. The curable composition of claim 9 wherein R h 2 is derived from a polyamine.

Assignees

• 3M Innovative Properties Company

Inventors

• Park Jiyoung
• Fukushi Tatsuo
• Guerra Miguel A
• Jariwala Chetan P
• Hintzer Klaus

Classifications

• C08F214/28 Primary

  Hexyfluoropropene · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29C48/09

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

• B29C48/9105

  of hollow articles · CPC title

• C08F214/22

  Vinylidene fluoride · CPC title