Latent elastic laminates and methods of making latent elastic laminates
View Patent ↗A latent elastic laminate material, and methods of making latent elastic laminate materials. The laminate includes a latent polymer, which itself may or may not possess latent elasticity, that is applied to at least one elastic member while the elastic member is in a stretched configuration. The elastic member, at least partially covered with the latent polymer, is attached to at least one substrate. The amount of latent polymer applied to the elastic member may provide enough force to overcome a retractive force of the elastic member when the latent polymer is at a temperature below a softening point of the latent polymer, yet the amount of latent polymer may be small enough to allow the laminate to retract into an elastic, gathered structure when the laminate is heated to a softening point of the latent polymer. The laminate may be incorporated into a variety of articles including personal care garments and cleaning cloths.
1. A method for producing a latent elastic laminate material, comprising:
stretching at least one elastic member;
extruding a latent polymer in the form of a film or filaments;
applying the latent polymer onto the at least one stretched elastic member, wherein the latent polymer is applied onto the at least one stretched elastic member at a temperature below its softening point;
applying an adhesive to at least one substrate, the at least one elastic member, the latent polymer or combinations thereof;
attaching at least one substrate to the latent polymer on the at least one stretched elastic member, wherein the temperature of the adhesive is below the softening point of the latent polymer upon attachment of the at least one substrate;
wherein the amount of latent polymer applied to the at least one stretched elastic member provides enough force to overcome a retractive force of the at least one elastic member when the polymer is at a temperature below a softening point of the polymer, and the amount of polymer is small enough to allow the laminate to retract into an elastic, gathered structure when the laminate is heated to at least a softening point of the polymer.
2. The method of claim 1 , further comprising using a vertical filament lamination process to stretch the at least one elastic member.
3. The method of claim 1 , wherein the latent polymer is in the form of at least one of the group consisting of filaments, film, starved slot-coated film, a swirled application, an oscillated application, strand wrapping, melt blow spray, and combinations thereof.
4. The method of claim 1 , wherein the latent polymer comprises at least one of the group consisting of adhesive, polyolefin, elastomeric polyolefin, and combinations thereof.
5. The method of claim 1 , wherein the latent polymer comprises a non-elastic polymer.
6. The method of claim 1 , wherein the latent polymer comprises an adhesive.
7. The method of claim 1 , wherein the latent polymer comprises a thermoplastic elastic selected from the group consisting of tackified styrenic block-copolymer, polyurethane, and combinations thereof.
8. The method of claim 1 , further comprising applying a hot melt adhesive to the at least one substrate prior to attaching the at least one substrate to the latent polymer on the at least one stretched elastic member.
9. The method of claim 1 , further comprising heating the laminate to impart abrasive properties to the laminate.
10. The method of claim 1 , wherein the latent polymer is extruded directly onto a chill roll.