Water based construction adhesive having improved moisture resistance useful for binding two substrates

• US 6,485,601 B1
• Filed: 09/21/1998
• Issued: 11/26/2002
• Est. Priority Date: 08/13/1997
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF Corporation (BASF SE)
• Inventors: Cavalier, Donald R., Drewery, Michael J., Egan, Luke S.
• Primary Examiner(s): Gallagher, John J.
• Application Number:
  US09/157,482
• Time in Patent Office: 1,527 Days
• Field of Search: 156/332, 156/331.8, 524/832, 524/813, 526/302
• US Class Current: 156/331.8
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 33/00 Compositions of homopolymers or 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 of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• CPC Class Codes: C09J 133/064 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
• CPC Class Codes: C09J 2400/303 in the substrate
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 5/00 Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers

Abstract

The present invention relates to an environmentally safe water based construction adhesive suitable for binding two (2) substrates together under conditions wherein moisture resistance is a requirement.

Claims

1. A method for adhering two substrates together comprising the step of applying to at least one substrate, a construction adhesive comprising a polymer made by emulsion polymerizing a mixture of monomers consisting essentially of:

(a) 20 to 60%, based on the total weight of monomers, soft acrylic ester monomers

(b) 20 to 60%, based on the total weight of monomer, hard monomers

c) 1 to 4%, based on tie total weight of monomers, ureido containing polymerizable monomers

(d) 1 to 4%, based on the total weight of monomers, vinyl base monomers

(e) 1 to 8%, based on the total weight of monomer, polymerize functional acids,

and compounds selected from the group consisting of catalyst, chain transfer agents, and optionally, compounds selected from the group consisting of dispersants, defoamers, tackifiers, freeze-thaw inibitors, fillers, thickeners and mixtures thereof,

to form a water-based adhesive having a water-based adhesive having a viscosity of between 5,000 and 1,000,000 cps,

and subsequent to application of the adhesive, contacting the two substrates for bonding.

2. A method according to claim 1, wherein said two substrates to be adhered are plywood and lumber.

3. The method of claim 1 wherein the soft acrylic ester monomers are selected from the group consisting of:

monomers of the formula;

4. The method of claim 3 wherein the soft acrylic ester monomers include butyl acrylate.

5. The method of claim 3 wherein the soft acrylic monomers comprise 20-60% of said composition.

6. The method of claim 3 wherein the soft acrylic monomers comprise 45-55% of said composition.

7. The method of claim 1 wherein the hard monomers are selected from the group consisting of:

monomers of the formula;

8. The method of claim 3 wherein the hard monomers are selected from the group consisting of monomers of the formula:

9. The method of claim 7 wherein the hard monomers comprise 20-60% of the composition.

10. The method of claim 9 wherein the hard monomers include methyl methylacrylate.

11. The method of claim 1 wherein the ureido containing polymerizable monomers are selected from the group consisting of:

2-ureido-ethyl acrylate;

2-ureido-methyl acrylate;

2-ureido-ethyl acrylamide;

2-ureido-ethyl methacrylamide;

1-{2-(3-alloxy-2-hydroxypropylamino)ethyl]imidazolin-2-one; and

combinations thereof.

12. The method of claim 7 wherein the ureido containing polymerizable monomers are selected from the group consisting of:

2-ureido-ethyl acrylate;

2-ureido-methyl acrylate;

2-ureido-ethyl acrylamide;

2-ureido-ethyl methacrylamide;

1-{2-(3-alloxy-2-hydroxypropylamino)ethly]imidazolin-2-one; and

combinations thereof.

13. The method of claim 11, wherein the ureido containing polymerizable monomers comprise 2-3% of the composition.

14. The method of claim 12 wherein the ureido containing monomers include 2-ureido-methyl-acrylate.

15. The method of claim 1 wherein the vinyl base monomers are selected from the group consisting of:

acrylamide;

acrylonitrile;

1,2-butadiene;

1,3-butadiene;

chloroprene;

1,3,5-hexatriene;

vinyl acetate;

vinyl chloride;

vinyl toluene;

vinyl versatate;

vinylidene chloride; and

combinations thereof.

16. The method of claim 12 wherein the vinyl base monomers are selected from the group consisting of:

acrylamide;

acrylonitrile;

1,2-butadiene;

1,3-butadiene;

chloroprene;

1,3,5-hexatriene;

vinyl acetate;

vinyl chloride;

vinyl toluene;

vinyl versatate;

vinylidene chloride; and

combinations thereof.

17. The method of claim 15 wherein the vinyl monomers comprise 2-3% of the composition.

18. The method of claim 15 wherein the vinyl monomers include acrylamide.

19. The method of claim 1 wherein the polymerizable functional acids are selected from the group consisting of:

acrylic acid;

methacrylic acid;

alpha-haloacrylic acids;

itaconic acid;

maleic acid;

fumaric acid and combinations thereof.

20. The method of claim 12 wherein the polymerizable functional acids are selected from the group consisting of:

acrylic acid;

methacrylic acid;

alpha-haloacrylic acids;

itaconic acid;

maleic acid;

fumaric acid and combinations thereof.

21. The method of claim 19 wherein the polymerizable functional acids comprise 2-3% of the composition.

22. The method of claim 1 wherein the vinyl monomers include acrylic acid.

23. The method of claim 1 wherein the polymer is formed from a monomer mixture comprising:

about 49 parts n-buty acrylate;

about 51 parts methymethacrylate;

about 1.9 parts 2-ureidomethyl acrylate

about 1.7 parts acrylamide; and

about 1 part acrylic acid.

24. The method of claim 1 wherein the composition has a total VOC level not exceeding 2%.