Patent ID: 8821931

Claim:
A composition comprising: a particle comprising a polymeric structure of cells formed from a polymeric material comprising a polymer having a number average molecular weight of at least 20,000 g/mole, wherein said cells have an average diameter between 0.1 and 50 micrometers and at least a portion of the cells are exposed on the surface of the particle; the particle having a diameter between 1 and 500 micrometers; wherein said polymeric material comprises one or more polymers selected from the group consisting of poly(ethylene-co-butene), a block copolymer of ethylene and propylene, a block copolymer of polyethylene and an ethylene-styrene random copolymer, a block copolymer of polybutadiene and polystyrene, a block copolymer of polyethylene and polystyrene, a block copolymer of hydrogenated styrene-butadiene copolymers, a butadiene block copolymer, polypropylene, polyethylene, polycarbonate, polyethylene oxide, polyimides, syndiopolystyrene, syndiopolybutadiene, isotactic polystyrene, and polyethylenes; wherein the cells are not created with blowing agents.