Elastic particle foam based on polyolefin/styrene polymer mixtures
AssigneeBASF Aktiengesellschaft Patents, Trademarks and Licenses
InventorsCarsten Schips, Klaus Hahn, Georg Gräßel, Daniela Longo, Jens Aßmann, Andreas Gietl
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Abstract
Thermoplastic particle foams which have cells having a mean cell size in the range from 20 to 500 μm and in which the cell membranes have a nanocellular or fibrous structure having pore or fiber diameters below 1500 nm, and also processes for producing them.
Claims20
A thermoplastic particle foam which has cells having a mean cell size in the range from 20 to 500 μm, wherein the cell membranes have a nanocellular or fibrous structure having pore or fiber diameters below 1500 nm.
An expandable, thermoplastic polymer particle comprising a polymer matrix comprising
- A) from 45 to 98.9 percent by weight of styrene polymer,
- B) from 1 to 45 percent by weight of polyolefin and
- C) from 0.1 to 10 percent by weight of a hydrogenated or unhydrogenated styrene-butadiene block copolymer, with the sum of A) to C) being 100% by weight, and, in add it ion,
- D) from 1 to 15 percent by weight, based on the polymer matrix, of a blowing agent,
- E) from 0.3 to 5 percent by weight, based on the polymer matrix, of a nucleating agent.
Dependencies are inferred from the claim text.