Adhesive compositions containing stable amino-containing polymer latex blends

• US 6,417,267 B1
• Filed: 05/24/2000
• Issued: 07/09/2002
• Est. Priority Date: 05/28/1996
• Status: Expired due to Term

• Current Assignee: Eastman Chemical Company
• Original Assignee: Eastman Chemical Company
• Inventors: Stockl, Rebecca R., Collins, Martha J., Taylor, James W.
• Primary Examiner(s): SZEKELY, PETER A
• Application Number:
  US09/576,639
• Time in Patent Office: 776 Days
• Field of Search: 524/800, 524/808, 524/839, 524/845, 524/846, 524/501, 427/393.5, 427/388.2, 427/385.5, 427/388.4, 523/201
• US Class Current: 524/808
• CPC Class Codes: C08F 2/22 Emulsion polymerisation
• CPC Class Codes: C08F 220/00 Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
• CPC Class Codes: C08F 220/283 and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
• CPC Class Codes: C08F 246/00 Copolymers in which the nature of only the monomers in minority is defined
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 2800/20 as weight or mass percentages
• CPC Class Codes: C08F 2810/30 leading to the formation or introduction of aliphatic or alicyclic unsaturated groups
• CPC Class Codes: C08F 8/00 Chemical modification by after-treatment graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups
• CPC Class Codes: C09D 11/106 containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 133/062 Copolymers with monomers not covered by C09D133/06
• CPC Class Codes: C09D 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09D151/04, C09D151/06 take precedence
• CPC Class Codes: C09J 133/062 Copolymers with monomers not covered by C09J133/06

Abstract

This invention provides the composition, preparation, and end-use of waterborne crosslinking technology based compositions prepared from water-based latexes. The invention provides a water-based latex comprising dispersed, waterborne amino-functional polymer particles; dispersed, waterborne acetoacetoxy-functional polymer particles; and water. In a preferred embodiment, a latex of the invention comprises dispersed, waterborne polymeric (polyamino)enamine (PPAE) particles; dispersed, waterborne acetoacetoxy-functional polymer particles; and water. The PPAE is the reaction product of a surfactant-stabilized acetoacetoxy-functional polymer (SAAP) and a poly(alkylenimine). The water-based latexes of the invention provide stable emulsions containing a blend of waterborne polymer particles which undergo crosslinking upon film formation. The latex films or coatings may be cured at ambient temperatures or may be thermally cured. The latex is useful in variety of adhesive formulations such as pressure sensitive adhesives, laminating adhesives, and the like.

Claims

1. An adhesive composition, comprising a mixture of

(a) a water-based latex comprising

(i) dispersed waterborne amino-functional polymer particles having a glass transition temperature (Tg) of greater than about 0°

C.;

(ii) dispersed waterborne acetoacetoxy-functional polymer particles having a glass transition temperature (Tg) of greater than about 0°

C.; and

(iii) water; and

(b) a non-acetoacetoxy-functional polymer having a Tg of about 20°

C. or lower, wherein said non-acetoacetoxy-functional polymer (b) is different than said amino-functional polymer (a)(i).

2. The adhesive composition of claim 1, wherein the amino-functional polymer (i) of water-based latex (a) is a polymeric (polyamino) enamine comprising the reaction product of a surfactant-stabilized acetoacetoxy-functional polymer and a poly(alkylenimine).

3. The adhesive composition of claim 1, wherein the amino-functional polymer (i) of water-based latex (a) is present from about 5 to about 50 weight percent based on dry resin and the acetoacetoxy-functional polymer (ii) of water-based latex (a) is present from about 75 to about 90 weight percent based on dry resin.

4. The adhesive composition of claim 1, wherein the non-acetoacetoxy-functional polymer (b) has a Tg of about −

20°

C. to about 20°

C.

5. The adhesive composition of claim 1, wherein the non-acetoacetoxy-functional polymer (b) has a Tg of less than about 0°

C.

6. The adhesive composition of claim 5, wherein the non-acetoacetoxy-functional polymer (b) has a Tg of less than about −

20°

C.

7. The adhesive composition of claim 1, comprising from about 2% to about 50% of the water-based latex (a) based on the combined weight of the water-based latex (a) and the non-acetoacetoxy functional polymer (b).

8. The adhesive composition of claim 1, wherein the acetoacetoxy-functional polymer (ii) of water based latex (a) has enamine-functional groups and allyl-functional groups.

9. The adhesive composition of claim 1, wherein the acetoacetoxy-functional polymer (ii) of water based latex (a) is an enamine-functional polymer.

10. The adhesive composition of claim 1, wherein the acetoacetoxy-functional polymer (ii) of water-based latex (a) comprises

about 1 to about 40 weight percent of a monomer of Formula (1):

11. The adhesive composition of claim 10, wherein the monomer of Formula (1) is selected from the group consisting of acetoacetoxyethyl methacrylate, acetoacetoxyethyl acrylate, acetoacetoxy(methyl)ethyl acrylate, acetoacetoxypropyl acrylate, and acetoacetoxybutyl acrylate and the non-self-polymerizing, surface-active vinyl monomer is a polyoxyethylene alkyl phenyl

where R is nonyl or octyl, n ranges from 15 to 50, and m ranges from 15 to 40.

12. The adhesive composition of claim 1, wherein the non-acetoacetoxy functional polymer (b) is selected from the group consisting of polyester-amides, alkyds, polyurethanes, polyamides, acrylics, vinyl polymers, polymers having pendant allyl groups, styrene-butadiene polymers, vinylacetate-ethylene copolymers, and mixtures thereof.

13. The adhesive composition of claim 12, wherein the non-acetoacetoxy functional polymer is an acrylic or a vinyl acrylic polymer.

21. The adhesive composition of claim 1, wherein the ratio of latex (a) to non-acetoacetoxy-functional polymer (b) ranges from about 1:

10 to about 4;

1.

14. A method for laminating a first substrate to a second substrate comprising applying an adhesive composition to a surface of the first substrate and pressing the surface of the first substrate against the second substrate, wherein the adhesive composition comprises a mixture of

(a) a water-based latex comprising

(i) dispersed waterborne amino-functional polymer particles having a Tg of greater than about 0°

C.,

(ii) dispersed waterborne acetoacetoxy-functional polymer particles having a Tg of greater than about 0°

C., and

(iii) water; and

(b) a non-acetoacetoxy functional polymer having a Tg of about 20°

C. or lower.

15. The method of claim 14, wherein the first substrate and second substrate are selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, and polyvinyl chloride.

16. A method for laminating a first substrate and a second substrate comprising passing the first and second substrates through a two roll nip having an opening and injecting an adhesive composition at the nip opening towards the first substrate and/or the second substrate, wherein the adhesive composition comprises a mixture of

(a) a water-based latex comprising

(i) dispersed waterborne amino-functional polymer particles having a Tg of greater than about 0°

C.,

(ii) dispersed waterborne acetoacetoxy-functional polymer particles having a Tg of greater than about 0°

C., and

(iii) water; and

(b) a non-acetoacetoxy functional polymer having a Tg of about 20°

C. or lower.

17. A method of making a substrate bearing a coating of a pressure sensitive adhesive on at least one surface thereof comprising applying an adhesive composition to a surface of the substrate, wherein the adhesive composition comprises a mixture of

(a) a water-based latex comprising

(i) dispersed waterborne amino-functional polymer particles having a Tg of greater than about 0°

C.,

(ii) dispersed waterborne acetoacetoxy-functional polymer particles having a Tg of greater than about 0°

C., and

(iii) water; and

(b) a non-acetoacetoxy functional polymer having a Tg of about 0°

C. or lower.

18. The method of claim 17, wherein the substrate is selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, and polyvinyl chloride.

19. A method of making an adhesive composition with improved shear and/or cohesion properties, comprising:

adding to a polymer composition an effective amount of a water-based latex comprising

(i) dispersed waterborne amino-functional polymer particles having a Tg of greater than about 0°

C.;

(ii) dispersed waterborne acetoacetoxy-functional polymer particles having a Tg of greater than about 0°

C.; and

(iii) water.

20. The method of claim 19, wherein the amino-functional polymer (i) is a polymeric (polyamino) enamine comprising the reaction product of a surfactant-stabilized acetoacetoxy-functional polymer and a poly(alkylenimine).