Self-foaming hot melt adhesive compositions and methods of making and using same
AssigneeFoammatick, LLC
InventorWilliam Stumphauzer
Life of this patent
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Abstract
The present invention relates to self-foaming hot melt adhesive compositions and methods of making and using the same. Self-foaming hot melt adhesive compositions are formed by admixing a dispersion concentrate including a chemical blowing agent and a compatible carrier (liquid or molten) with a molten base hot melt adhesive composition at a temperature below the decomposition temperature of the chemical blowing agent. The resolidified material is processed through a device that heats the material above the decomposition temperature of the chemical agent and cools it below such temperature before being dispensed. The device preferably includes sensors and a controller configured to prevent the material from accumulating an adverse thermal history during processing.
Claims8
A method for making a self-foaming hot melt adhesive composition comprising:
- dispersing a chemical blowing agent in a carrier to form a concentrated micronized dispersion that does not include agglomerates of the blowing agent;
- admixing the concentrated micronized dispersion into a base hot melt adhesive composition at a temperature above the melt temperature of the base hot melt adhesive composition but below a decomposition temperature of the chemical blowing agent to form an admixture;
- and
- cooling the admixture below a temperature at which the admixture solidifies to obtain the self-foaming hot melt adhesive composition in solid form;
- wherein the chemical blowing agent is in the form of a powder with an average particle size within the range of 3 to 100 microns, and
- wherein the carrier is either
- (1) a liquid that is compatible with the base hot melt adhesive composition, or
- (2) a molten low viscosity component of the base hot melt adhesive composition.
Dependencies are inferred from the claim text.