Process of producing transparent PBT/polycarbonate film

Details Process of producing transparent PBT/polycarbonate film Process of producing transparent PBT/polycarbonate film

1990-09-14

1992-03-17

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

26421112, B29C 4720, B29C 5528

Patent

active

050966537

ABSTRACT:
A process of producing a transparent resin film includes inflation molding in an upward direction a resin composition which having 100 parts by weight of a polybutylene terephthalate resin having an intrinsic viscosity IV.sub.a of at least 1.0, and between 15 to 45 parts by weight of a polycarbonate resin having an intrinsic viscosity IV.sub.b of at least 0.4. The polybutylene terephthalate and polycarbonate resins are present such that the ratio .eta..sub.A /.eta..sub.B is between 0.35 to 1.5, wherein .eta..sub.A is the melt viscosity of the polybutylene terephthalate resin at a shear rate of 100.sup.-1 at 260.degree. C., and .eta..sub.B is the melt viscosity of the polycarbonate resin at a shear rate of 100.sup.-1 at 260.degree. C. During inflation molding, the resin composition is extruded at an extrusion temperature T(.degree.C.) which satisfies the equation:

REFERENCES:
patent: 4869864 (1989-09-01), Taniguchi

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