U.S. Patent 8,329,294 (December 11, 2012), "Styrene-Modified Polypropylene Type Resin Particle, Foamable Styrene-Modified Polypropylene Type Resin Particle, Styrene-Modified Polypropylene Type Resin Foamed Particle, Styrene-Modified Polypropylene Type Resin Foamed Molded Product, and Production Methods thereof," Shinji Ishida, and Masahiko Ozawa (Sekisui Plastics Co., Ltd., Osaka, Japan).
Polystyrene foams are very common, but have poor chemical resistance and impact resistance. In contrast, polypropylene foams have excellent chemical resistance and impact resistance, but poor stiffness. Ishida and Ozawa developed a styrene-modified polypropylene foam with good stiffness, chemical resistance and impact strength. This material contains 30 to 600 parts by weight polystyrene per 100 parts poly-propylene, preferably a propylene-ethylene copolymer. The polystyrene is dispersed as 5 micron or less particles in the polypropylene matrix.
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|Title Annotation:||INDUSTRY PATENTS; recieved patent|
|Article Type:||Brief article|
|Date:||Mar 1, 2013|
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