Rubber adhesive compositions containing vinyl pyridine latex polymers with alternate nitrogen monomers
View Patent ↗The invention relates to polymeric latexes that can be used in adhesive compositions, which provide improved bonding of rubber articles to rubber reinforcing articles. The adhesive composition includes a single or a blend of polymeric latexes comprising a conjugated aliphatic monomer, a vinylaromatic monomer, a vinylpyridine monomer, and a nitrogen-containing monomer comprising a reactive N-methylol- or N-alkoxy-functionality. Use of the monomer comprising a nitrogen-containing monomer comprising a reactive N-methylol- or N-alkoxy-functionality allows for reduced amounts of the vinylpyridine monomer in the latex, and enhances the bonding properties of the adhesive composition. Use of the adhesive composition provides economic and chemical advantages for the preparation of reinforced rubberized articles.
1. An aqueous latex adhesive composition comprising
(1) one or more polymerization products of monomers that comprise
(a) at least one conjugated aliphatic diene,
(b) at least one vinyl aromatic monomer,
(c) at least one vinyl pyridine,
(d) a nitrogen atom-containing monomer that comprises reactive N-methylol or N-alkoxy functionality, and
(e) optionally, an acidic monomer; and
(2) a resin component comprising a phenol-formaldehyde resin, a resorcinol formaldehyde resin, a urea formaldehyde resin or a melamine formaldehyde resin,
wherein said one or more polymerization products comprise a higher weight percentage units from (a) than units from (b), (c) or (d) and no more than 20 weight percent units from (c) and (d).
2. The aqueous latex adhesive composition of claim 1 wherein said composition comprises a resorcinol-formaldehyde resin.
3. The aqueous latex adhesive composition of claim 2 wherein the weight ratio of said one or more polymerization products to said resin component is from 20:1 to 2:1.
4. The aqueous latex adhesive composition of claim 1 wherein said one or more polymerization products comprise at least 55 weight percent units from (a).
5. The aqueous latex adhesive composition of claim 4 wherein said one or more polymerization products comprise from 65 to 80 weight percent units from (a).
6. The aqueous latex adhesive composition of claim 1 wherein said one or more polymerization products comprise from 10 to 40 weight percent units from (b).
7. The aqueous latex adhesive composition of claim 6 wherein said one or more polymerization products comprise from 14 to 20 weight percent units from (b).
8. The aqueous latex adhesive composition of claim 1 wherein said one or more polymerization products comprise no more than 11 weight percent units from (c) and (d).
9. The aqueous latex adhesive composition of claim 1 wherein said one or more polymerization products comprise from 4 to 15 weight percent units from (c).
10. The aqueous latex adhesive composition of claim 9 wherein said one or more polymerization products comprise from 5 to 9 weight percent units from (c).
11. The aqueous latex adhesive composition of claim 1 wherein said monomer that comprises the reactive N-methylol or N-alkoxy functionality further comprises a secondary amine group or an amide group.
12. The aqueous latex adhesive composition of claim 1 wherein said one or more polymerization products comprise from 0.1 to 3.5 weight percent units from (d).
13. The aqueous latex adhesive composition of claim 12 wherein said one or more polymerization products comprise from 1.0 to 2.5 weight percent units from (d).
14. The aqueous latex adhesive composition of claim 1 comprising two polymers, the first of said polymers comprising units from (c) and the second of said polymers comprising units from (d).
15. A method for preparing reinforced rubberized articles comprising bonding a rubber article to a rubber reinforcing article with the adhesive composition of claim 1 .
16. The aqueous latex adhesive composition of claim 1 comprising a polymerization product of monomers that comprise monomers (a)-(d).
17. The aqueous latex adhesive composition of claim 16 comprising from 4 to 15 weight percent units from (c) and from 0.1 to 3.5 weight percent units from (d).
18. The aqueous latex adhesive composition of claim 17 comprising from 5 to 9 weight percent units from (c) and from 0.5 to 3.5 weight percent units from (d).
19. The aqueous latex adhesive composition of claim 17 comprising a resorcinol-formaldehyde resin.
20. The aqueous latex adhesive composition of claim 16 wherein said aqueous latex adhesive composition comprises a resorcinol-formaldehyde resin.