Method for the preparation of rigid polyvinyl chloride foams

Details Method for the preparation of rigid polyvinyl chloride foams Method for the preparation of rigid polyvinyl chloride foams

1981-04-22

1983-11-15

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264176R, 264DIG13, 425209, 425817C, B29D 2700

Patent

active

044155140

ABSTRACT:
Method for the preparation of rigid polyvinyl chloride foams with a density of below 200 kg/m.sup.3, in which method rigid polyvinyl chloride which is provided with a melt-flow improver is foamed with a physical blowing agent via an extruder, in which method in a first step, rigid polyvinyl chloride, together with and preferably mixed with 0.1-15 parts by weight per 100 parts by weight of polyvinyl chloride of a melt-flow improver is fed to an extruder and extruded therewith to form a granulate, this granulate is subsequently impregnated, in a second step, with a physical blowing agent and finally, in a third step, the impregnated granulate is fed, to a foaming extruder in which the granulate is extruded while it passes through a temperature profile in which process the rigid polyvinyl is foamed.

REFERENCES:
patent: 3287477 (1966-11-01), Vesilind
patent: 3983296 (1976-09-01), Purvis et al.

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