Aqueous vinyl chloride-ethylene copolymer/polyisocyanate adhesive compositions for wood composites

Claim 2

In a method for making a wood-wood laminate by applying an aqueous polymer/isocyanate adhesive composition to a surface of the first wood substrate and joining the adhesive-coated surface with a surface of the second wood substrate, the improvement which comprises applying a water-based adhesive composition consisting essentially of: (a) a vinyl chloride-ethylene copolymer latex prepared by emulsion polymerization in the presence of a stabilizing system consisting essentially of 3-15 wt % polyvinyl alcohol, based on monomers, and (b) 5.50 wt %, based on copolymer, of a polyisocyanate.

Claim 3

The method of claim 1 in which the adhesive composition contains 10-30 wt % polyisocyanate.

Claim 4

The method of claim 1 in which the polyisocyanate is non-water dispersible polyisocyanate.

Claim 5

The method of claim 1 in which the copolymer is prepared in the presence of 4-10 wt % polyvinyl alcohol which is 87-89 mole % hydrolyzed.

Claim 6

In a method for making a wood-wood laminate by applying an aqueous polymer/isocyanate adhesive composition to a surface of the first wood substrate and joining the adhesive-coated surface with a surface of the second wood substrate, the improvement which comprises applying an adhesive composition consisting essentially of aqueous copolymer latex and a polyisocyanate having an isocyanate functionality greater than two, the aqueous latex containing 20-70% solids of a copolymer prepared by the emulsion polymerization of a monomer mixture that provides a copolymer consisting essentially of 65-90 wt % vinyl chloride, 5-35 wt % ethylene, and 0-10 wt % C 2 -C 4 hydroxyalkyl (meth)acrylate in the presence of a stabilizing system consisting essentially of 3-15 wt % (based on monomers) polyvinyl alcohol which is 70-91 mole % hydrolyzed.

Claim 7

In a method for making a wood-wood laminate by applying an aqueous polymer/isocyanate adhesive composition to a surface of the first wood substrate and joining the adhesive-coated surface with a surface of the second wood substrate, the improvement which comprises applying an adhesive composition consisting essentially of aqueous copolymer latex and a polyisocyanate having an isocyanate functionality greater than two, the aqueous latex containing 20-70% solids of a copolymer prepared by the emulsion polymerization of a monomer mixture that provides a copolymer consisting essentially of 65-90 wt % vinyl chloride, 5-35 wt % ethylene, and 0-10 wt % C 2 -C 4 hydroxyalkyl (meth)acrylate in the presence of a stabilizing system consisting essentially of 3-15 wt % (based on monomers) polyvinyl alcohol which is 70-91 mole % hydrolyzed.

Claim 8

The method of claim 5 in which the copolymer is 2-8 wt % hydroxyethylacrylate.

Claim 9

The method of claim 5 in which the copolymer is prepared in the presence of 4-10 wt % polyvinyl alcohol which is 87-89 mole % hydrolyzed.

Claim 10

The method of claim 6 in which the copolymer is prepared in the presence of 4-10 wt % polyvinyl alcohol which is 87-89 mole % hydrolyzed.

Claim 11

In a method for joining a wood substrate to a second wood substrate which comprises applying a coating of an aqueous polymer/polyisocyanate adhesive composition to a surface of the first wood substrate, partially drying the adhesive coating and joining the adhesive-coated surface with a surface of the second wood substrate, the improvement which comprises applying an adhesive composition consisting essentially of an aqueous copolymer latex and 10-30 wt % (based on copolymer) polyisocyanate having an isocyanate functionally greater than two, the aqueous latex containing 40-60% solids of a copolymer prepared by the emulsion polymerization of a monomer mixture that provides a copolymer consisting essentially of 65-90 wt % vinyl chloride, 5-35 wt % ethylene, and 0-10 wt % C 2 -C 4 hydroxylalkyl (meth)acrylate in the presence of a stabilizing system consisting essentially of 4-10 wt % (based on monomers) polyvinyl alcohol which is 87-89 mole % hydrolyzed.

Claim 12

In a method for joining a wood substrate to a second wood substrate which comprises applying a coating of an aqueous polymer/polyisocyanate adhesive composition to a surface of the first wood substrate, partially drying the adhesive coating and joining the adhesive-coated surface with a surface of the second wood substrate, the improvement which comprises applying an adhesive composition consisting essentially of an aqueous copolymer latex and 10-30 wt % (based on copolymer) polyisocyanate having an isocyanate functionally greater than two, the aqueous latex containing 40-60% solids of a copolymer prepared by the emulsion polymerization of a monomer mixture that provides a copolymer consisting essentially of 65-90 wt % vinyl chloride, 5-35 wt % ethylene, and 0-10 wt % C 2 -C 4 hydroxylalkyl (meth)acrylate in the presence of a stabilizing system consisting essentially of 4-10 wt % (based on monomers) polyvinyl alcohol which is 87-89 mole % hydrolyzed.

Claim 13

The method of claim 9 in which the copolymer is 65-90 wt % vinyl chloride and 20-25 wt % ethylene.

Claim 14

The method of claim 9 in which the copolymer contains 2-8 wt % hydroxyethyl acrylate.