Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1976-01-19
1978-06-13
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
159 2E, 264141, 425204, 526 68, 526 71, B29F 303
Patent
active
040949427
ABSTRACT:
A method for removing unreacted monomer (or monomers) from an ethylene homopolymer or a copolymer of ethylene and at least one monomer copolymerizable with ethylene during the course of pelletization by use of an extruder, said polymer having been formed by high-pressure polymerization by use of a radiation or a radical initiator, discharged from the reactor by way of a separator, and fed to said extruder to be pelletized, which method comprises injecting into said extruder 0.1 to 10% by weight (based on said polymer) of water or steam intermixing the polymer and the water or steam in the mixing section of the extruder screw, and subjecting the resulting mix to a subatmospheric pressure of 500 mmHg (absolute) or less in the venting zone provided in the extruder. This method permits efficient removal of the unreacted ethylene or the unreacted ethylene and comonomer contained in a homopolymer or copolymer of ethylene.
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patent: 3917507 (1975-11-01), Skidmore
Nakai Setsuo
Ochi Hiroshi
Sumitomo Chemical Company Limited
The Japan Steel Works Ltd.
Thurlow Jeffery R.
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