Plastic and nonmetallic article shaping or treating: processes – Disparate treatment of article subsequent to working,... – Effecting temperature change
Patent
1989-02-27
1990-11-13
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Disparate treatment of article subsequent to working,...
Effecting temperature change
264 37, 26432816, 26432817, 264349, 264DIG69, B29B 1700
Patent
active
049700430
ABSTRACT:
A process forming a moldable material from a granular scrap material such as a high grade reground rubber and a thermoplastic polymer such as a butadiene-styrene block copolymer sold under the trademark Kraton-D-3202 by Shell Chemical Company. A substantially uniformly distributed mixture of the reground rubber and the cohesive base material in a ratio of at least about 1:1 is processed under sufficient pressure and temperature to form a semi-stable moldable product. The semi-stable moldable product is then subjected or maintained under sufficient pressure to form a stable moldable product. The ratio of reground rubber to cohesive base material may be 7:3 or higher, while pressure on the semi-stable product may generally be in the range of 1800 psi or higher. The moldable product may be subsequently molded, preferably with high fill velocities and maximum venting.
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Doan Rosetta C.
Mitchell Albert W.
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