Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1989-09-11
1992-12-08
Carrillo, Ana L.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
264 13, 264101, 264102, 264143, 26421113, 26421123, 26421124, 264571, 264DIG61, 264DIG78, 524538, 525 53, 525178, 525183, 525184, 526 65, 526 66, 526 68, 528318, 528323, B29C 4700, C08L 7700, C08F 200
Patent
active
051695820
ABSTRACT:
In a method and apparatus for the production of thermoplastic, caprolactam containing molding compositions by hydrolytic polymerization of caprolactam in stirrer autoclaves in which a molten mass is polymerized at pressures of 5 to 20 bar and temperatures of 220.degree. to 280.degree. C., the molten mass is transferred into an intermediate vessel to which vacuum is applied for continued polymerization and removal of volatile portions. Subsequently, the mass is continuously fed into a multi-screw extruder, in order to attain at increased temperatures and vacuum the desired polymerization degree and the desired monomer and oligomer contents. In a subsequent zone of the extruder, when desired, additional agents are worked in, whereafter a further degasification occurs in the end zone of the extruder, whereafter the mass is extruded, quenched, subdivided and dried. The method and apparatus use relatively little energy as compared with the prior art.
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Carrillo Ana L.
Ems-Inventa AG
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