Title: Co-extrusion of polyvinylidene fluoride/polystyrene multiple-layered sheeting

Abstract: A process is disclosed for producing composite sheeting of polystyrene having a thin protective layer of vinylidene fluoride polymer. The process comprises joining a molten stream of each polymeric material in a single extruder discharge conduit such that there is produced a single molten stream having a reasonably well defined interface between the two types of polymeric material, and thereafter, passing the resulting single stream of material through a sheet-form extrusion die having its die lips generally aligned with the foregoing interface.

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Inventors: Wiley, Donald F. (Big Spring, TX, US)

Application Number: 663192
Filing Date: 1976-03-02
Publication_date: 1977-09-27
Assignee: Cosden Oil & Chemical Company (Big Spring, TX)
Primary Class(es): 428/213 264/173.13, 264/174.1, 428/220, 428/332, 428/421, 428/522
Other Classes:
US Patent Ref:

2821746	Feb, 1958	Biche, Jr.	264/214.
3491178	Jan, 1970	Nishioka et al.	264/171.
3576707	Apr, 1971	Schrenk et al.	428/36.
3579395	May, 1971	Rath	428/515.
3821182	Jun, 1974	Bair, Jr. et al.	264/171.

Other Refs:
Primary Examiner: Lesmes, George F.
Assistant Examiner: Thibodeau, P. J.
Attorney: