Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-10-08
1997-05-27
Zemel, Irina S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 72, 525 98, 525 99, C08L 5104, C08L 5302
Patent
active
056333188
ABSTRACT:
A polystyrene based composition is provided having high impact strength and gloss. The gloss is particularly noted when the resin is molded into plastic articles, especially at relatively cooler temperatures, such as 80.degree. F. to 100.degree. F. The composition contains three resins. The first resin comprises polystyrene and rubber particles smaller than 1.0 micron, such as 0.2 to 0.6 microns. The second resin comprises polystyrene and rubber particles larger than 1.0 micron. The third resin preferably is a block copolymer of styrene and butadiene. Unexpectedly, the third resin improves the gloss achieved by the overall composition.
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patent: 5039714 (1991-08-01), Kisahara
patent: 5294656 (1994-03-01), Okamoto
patent: 5334658 (1994-08-01), Blumeustern
Chevron Chemical Company
DeJonghe T. G.
Zemel Irina S.
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