Moisture cured reactive hot melt adhesive with monofunctional reactants as grafting agents
First Claim
1. A polyurethane hot melt adhesive composition consisting essentially of polyisocyanate, one or more polymeric polyols, a crystalline monofunctional, polymeric reactant and a functional thermoplastic polymer, wherein the one or more polymeric polyols is not a polyester polyol, wherein the adhesive comprises from about 5 wt % to about 20 wt % of the reactant and wherein the thermoplastic polymer is selected from the group comprising acrylic polymers, hydroxy functional acrylic polymers, polyvinyl acetate, polyvinyl chloride, methylene polyvinyl ether, cellulose acetate, styrene acrylonitrile, amorphous polyolefin, thermoplastic urethane, polyacrylonitrile, polybutadiene, and mixtures thereof.
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Accused Products
Abstract
High green strength reactive hot melt adhesives are prepared using crystalline monofunctional reactants.
26 Citations
15 Claims
- 1. A polyurethane hot melt adhesive composition consisting essentially of polyisocyanate, one or more polymeric polyols, a crystalline monofunctional, polymeric reactant and a functional thermoplastic polymer, wherein the one or more polymeric polyols is not a polyester polyol, wherein the adhesive comprises from about 5 wt % to about 20 wt % of the reactant and wherein the thermoplastic polymer is selected from the group comprising acrylic polymers, hydroxy functional acrylic polymers, polyvinyl acetate, polyvinyl chloride, methylene polyvinyl ether, cellulose acetate, styrene acrylonitrile, amorphous polyolefin, thermoplastic urethane, polyacrylonitrile, polybutadiene, and mixtures thereof.
- 7. A method of improving the set speed of a polyurethane adhesive comprising one or more polymeric polymeric polyols that are not a polyester polyol, comprising adding an effective amount of a crystalline monofunctional reactant to an adhesive formulation, wherein the adhesive comprises a functional thermoplastic polymer and wherein the adhesive comprises from about 5 to about 20 wt % of the reactant and the reactant is selected from the group comprising hydroxvl reactants, carboxyl reactants, and mixtures thereof.
Specification