Process for removing chloroprene dimers from polychloroprene

Details Process for removing chloroprene dimers from polychloroprene Process for removing chloroprene dimers from polychloroprene

1989-10-31

1990-07-24

Thurlow, Jeffrey

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

34 14, 34 36, 34164, 26421123, 264232, 264234, 264344, 425204, 425209, 526 71, 528483, 528502, B29C 4760, B29C 4776, B29C 7102

Patent

active

049434020

ABSTRACT:
Removing chloroprene dimers from polychloroprene by feeding to a screw extruder a polychloroprene latex and coagulating the latex in the extruder, feeding the coagulated latex to a dewatering zone and discharging the coagulated polychloroprene through a flow restriction which heats and pressurizes the polychloroprene to an area of reduced pressure to form a porous crumb. Also, the flow restriction applies back pressure sufficient that the water in the polychloroprene is forced out of a vent port. The polychloroprene crumb discharged from the extruder is heated to strip chloroprene dimer therefrom.

REFERENCES:
patent: Re30378 (1980-08-01), Bice et al.
patent: 3988306 (1976-10-01), Turner
patent: 4136251 (1979-01-01), Bice et al.
patent: 4183887 (1980-01-01), Karg
patent: 4213888 (1980-07-01), Karg et al.
patent: 4508592 (1985-04-01), Kowalski

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