Water-based release coating containing fluorochemical

• US 7,411,020 B2
• Filed: 12/28/2004
• Issued: 08/12/2008
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: DiZio, James P., Jariwala, Chetan P., Carlson, James G., Kinning, David J., Kumar, Ramesh C., Clark, John C.
• Primary Examiner(s): Egwim; Kelechi C
• Application Number:
  US11/027,606
• Publication Number:
  US 20060141194A1
• Time in Patent Office: 1,323 Days
• Field of Search: 524/220, 524/460, 524/504, 524/520, 525/199, 525/200, 525/902, 526/201, 523/201
• US Class Current: 525/119
• CPC Class Codes: C09D 133/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: Y10S 525/902 Core-shell
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive

Abstract

In one aspect, the invention provides a water-based release coating composition comprising a mixture of: A. from 0.1 to about 5 wt % of a fluoro(meth)acrylate (co)polymer or a fluorochemical urethane compound containing at least one fluorinated group having the formula —CF₂)_nCF₃, wherein n is an integer from 1 to 3; B. from about 5 to about 99.9 wt % of a copolymer comprising the reaction product of a. from about 40 to about 70 wt % of an alkyl (meth)acrylate, wherein the alkyl group contains from 16 to 22 carbon atoms, b. from about 3 to about 20 wt % of (meth)acrylic acid, c. from about 20 to about 40 wt % acrylonitrile, and d. from 0 to about 15 wt % of vinyl monomer, other than acrylonitrile, wherein the sum of a. through d. equals 100%; and C. from 0 to about 94.9 wt % of an extender polymer, wherein the sum of A., B., and C. is 100% and wt % is based on the total amount of solids in the composition.

Claims

1. A water-based release coating composition comprising water and solids, wherein the solids comprise a mixture of

(A) from 0.1 to about 5 wt % of a fluoro(meth)acrylate (co)polymer or a fluorochemical urethane compound containing at least one fluorinated group having the formula —

CF₂)_nCF₃, wherein n is an integer from 1 to 3;

(B) from about 15 to about 50 wt % of a copolymer consisting of the reaction product of

(a) from about 40 to about 70 wt % of an alkyl (meth)acrylate, wherein the alkyl group contains from 16 to 22 carbon atoms,

(b) from about 3 to about 20 wt % of (meth)acrylic acid,

(c) from about 20 to about 40 wt % acrylonitrile, and

(d) from 0 to about 15 wt % of vinyl monomer, other than those monomers of a. through c. above; and

(C) from 0 to about 84.5 wt % of an extender polymer wherein the wt %'"'"'s in said mixture are based on the total weight of solids in the release composition.

2. The composition according to claim 1 wherein (A) is a fluorochemical urethane compound wherein n is 3.

3. The composition according to claim 1 wherein (A) is a fluoro(meth)acrylate (co)polymer consisting of the reaction product of

(i) a fluorinated monomer having the formula:

R_f—

X—

OC(O)—

C(R)═

CH₂, wherein R_f represents a perfluorinated aliphatic group having 3 or 4 carbon atoms, X is an organic divalent linking group and R represents hydrogen or a lower alkyl group having 1 to 4 carbon atoms;

(ii) a chlorine containing comonomer selected from the group consisting of vinylidene chloride, vinyl chloride and mixtures thereof; and

(iii) monomers other than a fluorinated monomer and said chlorine containing comonomers.

4. The composition according to claim 1 wherein (A) is a fluoro(meth)acrylate (co)polymer comprising a monomer having the formula:

5. The composition according to claim 1 wherein (A) is a fluorochemical urethane compound, wherein the fluorochemicals urethane compound is a reaction product of:

one or more polyfunctional isocyanate compounds;

one or more hydrophilic polyoxyalkylene compounds;

one or more fluorochemical monofunctional compounds; and

one or more isocyanate-reactive silane compounds.

6. The composition according to claim 1 wherein the alkyl (meth)acrylate is selected from the group consisting of octadecyl acrylate, octadecyl methacrylate, behenyl acrylate and combinations thereof.

7. The composition according to claim 1 wherein the vinyl monomer is selected from the group consisting of methyl (meth)acrylate, butyl (meth)acrylate, iso-octyl meth)acrylate, 2-ethylhexyl (meth)acrylate, styrene, vinyl acetate, and combinations thereof.

8. The composition according to claim 1 wherein the extender polymer is an emulsion containing a material selected from the group consisting of polyvinyl acetate, vinyl acetate/ethylene copolymers, acrylic polymers, styrene/acrylic copolymers, and combinations thereof.

9. The water-based release coating composition of claim 1, wherein the solids comprise 0.5 to 2.5 wt % (A) and 15 to 50 wt % (B).

10. The water-based release coating composition of claim 9, wherein the solids comprise 50 to 84.5 wt % (C).

11. The water-based release coating composition of claim 1, further comprising additives, optionally wherein the additives are selected from the group consisting of defoamers, wetting agents, and combinations thereof.

12. The water-based release coating composition of claim 1, wherein the sum of the weight percents of(A), (B), and (C) in the solids is 100%.

13. An adhesive article comprising

a backing having first and second surfaces;

an adhesive on at least a portion of the first surface of the backing; and

a release composition on at least a portion of the second surface of the backing, wherein the release composition comprises a mixture of

(A) from 0.1 to about 5 wt % of a fluoro(meth)acrylate (co)polymer or a fluorochemical urethane compound containing at least one fluorinated group having the formula —

(CF₂)_nCF_3, wherein n is an integer from 1 to 3;

(B) from about 15 to about 50 wt % of a copolymer consisting of the reaction product of

(a) from about 40 to about 70 wt % of an alkyl (meth)acrylate, wherein the alkyl group contains from 16 to 22 carbon atoms,

(b) from about 3 to about 20 wt % of (meth)acrylic acid,

(c) from about 20 to about 40 wt % acrylonitrile, and

(d) from 0 to about 15 wt % of vinyl monomer, other than those monomers of (a) through (c) above; and

(C) from 0 to about 84.5 wt % of an extender polymer wherein the wt %'"'"'s in said mixture are based on the total weight of solids in the release composition.

14. The adhesive article according to claim 13 wherein the adhesive article is in the form of a multi-layer sheet or a roll.

15. The adhesive article according to claim 13 wherein the backing comprises a material selected from the group consisting of treated paper, untreated paper, cotton, rayon, polyester, glass, nylon, cellophane, acetate, polyester, vinyl, polyvinyl chloride, polypropylene, polyethylene, and polyimide, aluminum, stainless steel, lead, open and closed cell polyethylene, open and closed cell polyvinyl chloride, open and closed cell polyurethane, open and closed cell polychloroprene, rubber, metallized film, and combinations thereof.

16. The adhesive article according to claim 13 wherein the adhesive comprises a material selected from the group consisting of polyacrylates, polyvinyl ether, natural rubber, isoprene, polychloroprene, butyl rubber, polyisobutylene, butadiene-acrylonitrile polymer, thermoplastic elastomer, styrene-butadiene polymer, poly-alpha-olefin, amorphous polyolefin, silicone, ethylene vinyl acetate, polyurethane, polyamide, epoxy, polyvinylpyrrolidone, vinylpyrrolidone copolymers, polyesters, and mixtures thereof.

17. The adhesive article according to claim 13 in the form of a tape.

18. The tape according to claim 17 wherein the backing comprises crepe paper.

19. The tape according to claim 18 wherein the adhesive is a pressure sensitive adhesive.

20. The tape according to claim 19 wherein the backing has a primer layer on the first surface of the backing.

21. The tape according to claim 18 wherein the fluoro(meth)acrylate copolymer is a terpolymer of octadecylmethacrylate, vinylidene chloride, and N—

methyl perfluorobutanesulfonamidoethyl methacrylate.

22. The adhesive article according to claim 13, wherein the release composition comprises 0.5 to 2.5 wt % (A) and 15 to 50 wt % (B).

23. The adhesive article according to claim 22, wherein the release composition comprises 50 to 84.5 wt % (C).

24. The adhesive article according to claim 23, wherein the sum of the weight percents of(A), (B), and (C) in the release composition is 100%.