Process for the preparation of rubber-modified thermoplastic res

Details Process for the preparation of rubber-modified thermoplastic res Process for the preparation of rubber-modified thermoplastic res

1982-06-04

1984-07-31

Briggs,, Sr.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 53, 525242, 525289, 525290, 525292, 525308, 525315, 525322, 525404, 525942, C08F27904, C08F25502, C08F25506, C08F28306

Patent

active

044631375

ABSTRACT:
A process for the impact modification of a plastic with a rubber polymer to form a thermoplastic resin in a reactor extruder is provided. The process includes the steps of dissolving a rubber polymer in a solvent selected from the group consisting of ethylenically unsaturated monomers and non-polymerizable organic compounds to form a feed solution, introducing the feed solution into the feed section of a twin screw reactor extruder, introducing a separate feed stream containing a material in sufficient amount to precipitate the rubber polymer, heating the feed solution and feed stream under pressure to a temperature sufficient for polymerization to begin, polymerizing the monomers with the rubber polymer in the reactor extruder to form a thermoplastic resin and extruding the thermoplastic resin through a die. A novel ABS thermoplastic resin is also provided having a uniform distribution of rubber particles dispersed within the plastic phase of the resin, the rubber particles ranging in size of from about 0.01 to 0.25 microns. The thermoplastic portion of resin has an acrylonitrile content of more than about 26 weight percent and can have as much as 60 weight percent.

REFERENCES:
patent: 3511895 (1970-05-01), Kydonieus et al.
patent: 3607983 (1971-09-01), Rushton et al.
patent: 3780139 (1973-12-01), Sutter et al.
patent: 3928495 (1975-12-01), Dalton
patent: 3931356 (1976-01-01), Dalton
patent: 4053539 (1977-10-01), Delsarte
patent: 4308354 (1981-12-01), Jung et al.

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