Polymer orientation

Details Polymer orientation Polymer orientation

1996-01-23

1996-10-15

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2642106, B29C 5500

Patent

active

055651631

ABSTRACT:
A novel biaxially oriented polystrene sheet product and process for making the sheet. Oriented polystyrene sheet is prepared by melt extruding a polymer, such as styrenic resin having average molecular weight of at least 270,000, blended with a processing agent, such as mineral oil, to lower glass transition temperature of the resin by at least 10.degree. C. The cooled extruded sheet is biaxially oriented under reduced orientation load conditions and orientation temperature. In a preferred embodiment styrenic resin is blended with about 3-10 wt % paraffinic hydrocarbon oil, such as mineral white oil or the like, in the substantial absence of other additives to provide a clear, oriented polystyrene sheet product having high modulus and low haze.

REFERENCES:
patent: 4956140 (1990-09-01), Rolles et al.
patent: 5238623 (1993-08-01), Mrozinski
patent: 5275854 (1994-01-01), Maier et al.

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