Water-based adhesives

Abstract

A water-based adhesive comprising water-soluble polymers having carboxy groups and quaternary ammonium groups wherein the polymers can be derived by copolymerizing one or more unsaturated aliphatic carboxylic acid monomers, such as acrylic acid and/or methacrylic acid, and alkylaminoalkyl(meth)acrylate or alkylaminoalkyl(meth)acrylamide, such as dimethylaminoethyl methacrylate or dimethylaminopropylmethacrylamide and the water-based adhesive is a viscous liquid that is colorless, relatively odorless, and free of organic solvents.

Description

Claims

1. A water-based adhesive consisting essentially of a water-soluble polymer having carboxy groups and quaternary ammonium groups, wherein said polymer is represented by the formula: ##STR1## where the bracketed structures A, B, C and D are interpolymerized units randomly repeated and covalently bonded together in polymer chains, units A and C always being present and units B and D independently being present or absent; each R.sup.1 is a hydrogen atom or lower alkyl group; R.sup.2 and R.sup.3 are each independently a C.sub.1 to C.sub.4 alkyl group; each R.sup.4 is independently a hydrogen atom, a methyl group, or COOM; each R.sup.5 is independently a hydrogen atom, a lower alkyl group, or CH.sub.2 COOM, with the proviso that at least one of R.sup.4 and R.sup.5 is a hydrogen atom; X is the anion of an organic acid or a mineral acid; M is a hydrogen atom or an alkali metal atom; Z is O or NH; and subscripts x and y are independently integers of 1 to 3.

2. The adhesive according to claim 1 where units D are present and R.sup.4 and R.sup.5 are hydrogen.

3. The adhesive according to claim 1 where units D are absent and one of R.sup.4 and R.sup.5 is hydrogen.

4. The adhesive according to claim 1 where units D are present and in some units C both R.sup.4 and R.sup.5 are hydrogen and some other units C one of R.sup.4 and R.sup.5 is hydrogen.

5. The adhesive according to claim 1, wherein said polymer is represented by the formula: ##STR2## where Z is O or NH and x is an integer of 1 to 3.

6. The adhesive according to claim 5 wherein said polymer is made by polymerizing acrylic acid and one or more dialkylaminoalkyl(meth)acrylamides or dialkylaminoalkyl(meth)acrylates.

7. The adhesive according to claim 5 wherein said polymer is made by polymerizing N,N-dimethylaminoethyl methacrylate and acrylic acid.

8. The adhesive according to claim 5 wherein said polymer is made by polymerizing N,N-dimethylaminopropyl methacrylamide and acrylic acid.

9. The adhesive according to claim 1, wherein said polymer is represented by the formula: ##STR3## where Z is O or NH and x is an integer of 1 to 3.

10. The adhesive according to claim 9 wherein said polymer is made by polymerizing acrylic acid, methacrylic acid, and one or more dialkylaminoalkyl(meth)acrylates or dialkylaminoalkyl(meth)acrylamides.

11. The adhesive according to claim 9 wherein said polymer is made by polymerizing acrylic acid, methacrylic acid, and dimethylaminoethyl methacrylate.

12. The adhesive according to claim 9 wherein said polymer is made by polymerizing acrylic acid, methacrylic acid, and dimethylaminopropyl methacrylamide.