Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1973-01-24
1976-05-25
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
156244, 264176R, 4251335, 428412, 428500, B32B 2728, B32B 2708
Patent
active
039594327
ABSTRACT:
A process for the manufacture of composite sheeting having a layer of polystyrene and at least one layer of polycarbonate polymer firmly united thereto, comprising joining a molten stream of each of said polymeric materials in a conduit to form a single stratified stream of molten material conforming to the cross-section of said conduit and having a relatively sharply defined interface between said polymeric materials, and passing said stratified stream of molten material through a sheet-form extrusion die having its die lips generally aligned with said interface between the two polymeric materials.
REFERENCES:
patent: 2815308 (1957-12-01), Robinson et al.
patent: 3331900 (1967-07-01), Thomas
patent: 3432588 (1969-03-01), Breidt, Jr. et al.
patent: 3476627 (1969-11-01), Squires
patent: 3565737 (1971-02-01), LeFevre et al.
patent: 3565985 (1971-02-01), Schrenk et al.
patent: 3589976 (1971-06-01), Erb
Flat-Die Coextrusion, Thomka et al., Modern Plastics, Apr., 1972, pp. 62-63.
Cosden Oil & Chemical Company
Thurlow Jeffery R.
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