Fluoropolymer composition including an oligomer having an ultraviolet absorbing group

Patent metadata

Field	Value
Publication number	US-10577467-B2
Application number	US-201314654389-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 20, 2012
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A composition that includes a blend of a fluoropolymer and an ultraviolet light-absorbing oligomer. The oligomer has a first divalent unit having a pendent ultraviolet absorbing group and at least one of a second divalent unit that is non-fluorinated or a third divalent unit that is fluorinated. The pendent ultraviolet absorbing group can include a triazine group. The composition can be an extruded film. A method of making such an extruded film is also disclosed.

First claim

What is claimed is:

1. A composition comprising a blend of a fluoropolymer and an ultraviolet light-absorbing oligomer, wherein the ultraviolet light-absorbing oligomer comprises:
a first divalent unit comprising a pendent ultraviolet absorbing group, wherein the first divalent unit is represented by formula:

wherein
R 1 is hydrogen or methyl;
V is O;
X is alkylene or alkyleneoxy group having from 2 to 6 carbon atoms and optionally interrupted by one or more —O— groups;
R is alkyl having from one to four carbon atoms;
n is 0; and
Z is a 4,6-bisphenyl[1,3,5]triazin-2-yl group that is not substituted; and

a second divalent unit represented by formula:

wherein
R 6 is hydrogen or methyl; and
R 5 is methyl,

wherein the first divalent unit is present in the ultraviolet light-absorbing oligomer in a range from 5 percent to 50 percent by weight, based on the total weight of the ultraviolet light-absorbing oligomer, and
wherein the ultraviolet light-absorbing oligomer is in the composition in an amount ranging from 0.5 percent to 20 percent by weight, based on the total weight of the composition.

2. The composition of claim 1 , wherein the composition is in the form of a film.

3. The composition of claim 1 , wherein the fluoropolymer is present in the blend in an amount of at least 90 percent by weight, based on the total weight of the blend.

4. The composition of claim 1 , wherein the composition is essentially free of volatile organic solvent.

5. A method of making the composition of claim 2 , the method comprising:
blending a composition comprising the fluoropolymer and the ultraviolet light-absorbing oligomer, wherein the ultraviolet light-absorbing oligomer comprises:
the first divalent unit represented by formula:

wherein
R 1 is hydrogen or methyl;
V is O;
X is alkylene or alkyleneoxy group having from 2 to 6 carbon atoms and optionally interrupted by one or more —O— groups;
R is alkyl having from one to four carbon atoms;
n is 0; and
Z is a 4,6-bisphenyl[1,3,5]triazin-2-yl group that is not substituted; and

the second divalent unit represented by formula:

wherein
R 6 is hydrogen or methyl; and
R 5 is methyl, and

extruding the composition into a film.

6. The method of claim 5 , wherein the composition is essentially free of volatile organic solvent.

7. The composition of claim 2 , wherein the film is a multilayer film.

8. The composition of claim 1 , wherein the fluoropolymer is selected from the group consisting of ethylene-tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer, polyvinylidene fluoride, and combinations thereof.

9. A photovoltaic device comprising the composition of claim 1 .

10. The composition of claim 1 , wherein the blend further comprises poly(methyl methacrylate).

11. The photovoltaic device of claim 9 , further comprising a CIGS cell.

12. The composition of claim 2 , wherein the film is a multilayer optical film.

13. The composition of claim 2 , wherein the film is on a traffic sign or automotive exterior or is an architectural film or a window film.

14. The composition of claim 1 , wherein fluoropolymer comprises polyvinylidene fluoride.

15. The composition of claim 14 , wherein the blend further comprises poly(methyl methacrylate).

16. The composition of claim 14 , wherein the first divalent unit is present in the ultraviolet light-absorbing oligomer in a range from 10 percent to 30 percent by weight, based on the total weight of the ultraviolet light-absorbing oligomer.

17. The composition of claim 1 , further comprising a second, different ultraviolet light-absorbing oligomer in the blend, wherein the second, different ultraviolet-light absorbing oligomer comprises:
a first divalent unit comprising a pendent benzotriazole; and
the second divalent unit.

18. The composition of claim 1 , further comprising a hindered amine light stabilizer.

19. The composition of claim 1 , wherein the first divalent unit is present in the ultraviolet light-absorbing oligomer in a range from 10 percent to 30 percent by weight, based on the total weight of the ultraviolet light-absorbing oligomer.

20. The composition of claim 19 , wherein R 6 is methyl.

Assignees

• 3M Innovative Properties Co

Inventors

• Olson David B
• Savu Patricia M
• Hebrink Timothy J

Classifications

• B29C48/08

  flexible, e.g. films · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• B29K2027/16

  PVDF, i.e. polyvinylidene fluoride · CPC title

• C08J2433/16

  Homopolymers or copolymers of esters containing halogen atoms · CPC title

• C08L33/16

  Homopolymers or copolymers of esters containing halogen atoms · CPC title