Process for the continuous production of rubber compounds in a t

Details Process for the continuous production of rubber compounds in a t Process for the continuous production of rubber compounds in a t

1992-09-09

1993-11-16

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264349, 425204, B29C 4740

Patent

active

052621111

ABSTRACT:
A process for the continuous production of a rubber compound in a twin-screw extruder is disclosed that improves the dispersion of carbon black in the extrudate while reducing the specific energy requirements of the extrudate. Rubber is fed into the extruder together with a processing aid and masticated up to a temperature of 120.degree. C. to 180.degree. C. Subsequently, a first part of carbon black representing preferably 40% to 80% of the whole quantity of carbon black is fed into the heated extrudate. Afterwards, plasticizing oil is added to the extrudate before the second remaining carbon black part is fed and incorporated into the extrudate at a temperature of 120.degree. C. to 180.degree. C. The whole compound is then cooled, a crosslinking agent is added, and the compound is homogenized and extruded.

REFERENCES:
patent: 3070836 (1963-01-01), De Haven et al.
patent: 3904719 (1975-09-01), Fritsch
patent: 4649005 (1987-03-01), Kobayashi et al.
patent: 4839114 (1989-06-01), Delphin et al.
patent: 4897236 (1990-01-01), Rabiger et al.
patent: 5158725 (1992-10-01), Handa et al.

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