Fluoropolymer compositions comprising fluorinated additives, coated substrates and methods

Patent metadata

Field	Value
Publication number	US-11866602-B2
Application number	US-201917045292-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 12, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A composition is described comprising at least one fluoropolymer. The fluoropolymer comprises at least 90% by weight based on the total weight of the fluoropolymer of polymerized units derived from perfluorinated monomers selected from tetrafluoroethene (TFE) and one or more unsaturated perfluorinated alkyl ethers and a fluorinated additive having a Mw of no greater than 50,000 g/mole comprising a partially fluorinated or perfluorinated alkyl or ether group. In some embodiments, the composition further comprises a fluorinated solvent. Also described are substrates comprising a coated surface of the fluoropolymer composition described herein.

First claim

What is claimed is:

1. A composition comprising
at least one fluoropolymer, wherein the at least one fluoropolymer comprises at least 90% by weight based on the total weight of the at least one fluoropolymer of polymerized units derived from perfluorinated monomers selected from tetrafluoroethene (TFE) and one or more unsaturated perfluorinated alkyl ethers;
a fluorinated solvent; and
a fluorinated additive having a Mw of no greater than 50,000 g/mole comprising a partially fluorinated or perfluorinated alkyl or (poly)ether group and a silane group; wherein the fluorinated additive has a concentration in the range of 10 to 50 wt. % solids.

2. The composition of claim 1 wherein the fluorinated additive has the general formula
Rf-[LSi(R 1 ) 3-x (R 2 ) x ] y
wherein Rf is a perfluorinated or partially fluorinated alkyl or (poly)ether group;
L is a covalent bond or a divalent linking group;
R 1 is independently hydroxyl or a hydrolyzable group;
R 2 group is a non-hydrolyzable group;
x ranges from 0-2; and
y is 1 or 2.

3. The composition of claim 1 wherein the unsaturated perfluorinated alkyl ethers of the at least one fluoropolymer has the general formula
Rf—O—(CF 2 ) n —CF═CF 2

wherein n is 1 or 0 and Rf is a perfluoroalkyl group or perfluoroether group.

4. The composition of claim 1 wherein the at least one fluoropolymer comprises one or more cure sites selected from nitrile, iodine, bromine, or a combination thereof.

5. The composition of claim 1 wherein the at least one fluoropolymer comprises 40 to 60% by weight of polymerized units of TFE based on the total weight of the at least one fluoropolymer.

6. The composition of claim 1 wherein the at least one fluoropolymer contains 0 to 5 wt.-% of polymerized units derived from non-fluorinated or partially fluorinated monomers.

7. The composition of claim 1 wherein the composition further comprises an amine compound.

8. The composition of claim 1 wherein the composition further comprises an alkoxy silane compound.

9. The composition of claim 1 wherein the composition comprises 0.01 to 25% by weight of the at least one fluoropolymer based on the weight of the total composition.

10. The composition of claim 1 wherein the solvent has a GWP of less than 1000.

11. The composition of claim 1 wherein the fluorinated solvent comprises a branched, partially fluorinated ether and wherein the branched, partially fluorinated ether corresponds to the formula:
Rf—O—R

wherein Rf is selected from perfluorinated and partially fluorinated alkyl or (poly)ether groups and R is selected from partially fluorinated and non-fluorinated alkyl groups.

12. The composition of claim 11 wherein the branched, partially fluorinated ether corresponds to the formula:
C p F 2p+1 —O—C q H 2q+1

wherein q is an integer from 1 to 5 and p is an integer from 5 to 11.

13. The composition according to claim 12 wherein the C p F 2p+1 — unit is branched.

14. A composition comprising at least one fluoropolymer, wherein the at least one fluoropolymer comprises at least 90% by weight based on the total weight of the at least one fluoropolymer of polymerized units derived from perfluorinated monomers selected from tetrafluoroethene (TFE) and one or more unsaturated perfluorinated alkyl ethers; and a fluorinated additive having a Mw of no greater than 50,000 g/mole comprising a partially fluorinated or perfluorinated alkyl or (poly)ether group and a silane group; wherein the fluorinated additive has a concentration in the range of 10 to 50 wt. % solids.

15. A method of making a coated substrate comprising:
i) applying a coating composition to a substrate wherein the coating composition comprises
at least one fluoropolymer, wherein the at least one fluoropolymer comprises cure sites and at least 90% by weight based on the total weight of the at least one fluoropolymer of polymerized units derived from perfluorinated monomers selected from tetrafluoroethene (TFE) and one or more unsaturated perfluorinated alkyl ethers;
a fluorinated solvent, and

a fluorinated additive having a Mw of no greater than 50,000 g/mole comprising a partially fluorinated or perfluorinated alkyl or ether group and a silane group or a (meth)acryl group; wherein the fluorinated additive has a concentration in the range of 10 to 50 wt. % solids; and
ii) removing the fluorinated solvent; and
iii) curing the coating composition at a temperature above 135° C. and/or curing the coating composition by exposure to actinic radiation concurrently or after removing the fluorinated solvent.

Assignees

• 3M Innovative Properties Company

Inventors

• Jing Naiyong
• Nguyen Tho Q
• Hintzer Klaus
• Smith Molly J
• Damte Gezahegn D

Classifications

• C09D127/18 Primary

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C08K5/544

  containing nitrogen · CPC title

• C08K5/5415

  containing at least one Si—O bond · CPC title