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US 7,879,441 B2Granted
Articles that include a polymer foam and method for preparing same
Assignee3M Innovative Properties Company
InventorsMark D. Gehlsen, Bradley S. Momchilovich
Life of this patent
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Abstract
Polymer foam articles prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.
Claims20
A foam article comprising:
- an extruded polymer foam formed by polymerization of one or more monomeric acrylic or methacrylic esters of non-tertiary alkyl alcohols, said alkyl alcohols having from 1 to 20 carbon atoms;
- and
- a homogeneous distribution of a plurality of thermoplastic expandable polymeric microspheres within the extruded polymer foam, said plurality of expandable polymeric microspheres comprising unexpanded expandable polymeric microspheres, at least partially expanded expandable polymeric microspheres, or both.
An article comprising:
- an extruded adhesive layer;
- and
- a homogeneous distribution of a plurality of thermoplastic expandable polymeric microspheres throughout the extruded adhesive layer, said plurality of thermoplastic expandable polymeric microspheres comprising unexpanded expandable polymeric microspheres, at least partially expanded expandable polymeric microspheres, or both;
- wherein the extruded adhesive layer comprises a polymer matrix comprising a blend of two or more polymers substantially free of urethane crosslinks and urea crosslinks to eliminate the need for isocyanates in said polymer matrix, wherein
- at least one of said polymers in said blend comprises a pressure sensitive adhesive polymer formed by polymerization of monomers comprising an acrylate, methacrylate, or combinations thereof;
- and at least one of said polymers is selected from unsaturated thermoplastic elastomers, acrylate monomer-insoluble saturated thermoplastic elastomers, acrylate-insoluble semicrystalline polymers, acrylate-insoluble amorphous polymers having a solubility parameter of less than 8 or greater than 11, elastomers containing ultraviolet radiation-activatable groups, and pressure sensitive and hot melt adhesives prepared from non-photopolymerizable monomers.
3 more elements
Dependencies are inferred from the claim text.