Process for manufacturing films from semi-crystalline fluid poly

Details Process for manufacturing films from semi-crystalline fluid poly Process for manufacturing films from semi-crystalline fluid poly

1987-12-24

1989-10-03

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264166, 264173, 4251331, 4253261, 425462, B29C 4706

Patent

active

048715069

ABSTRACT:
A process for manufacturing thermoplastic polymer films by coextrusion comprising coextruding by blow extrusion at least two thermoplastic polymers, one of the polymers being a semi-crystalline fluid polymer, the other a thermoplastic polymer incompatible with and with no adhesive affinity for the semi-crystalline fluid polymer and possessing sufficient extrudate strength to support the semi-crystalline polymer, cooling the coextrudate, separation of the resulting films, and recovering at least the semi-crystalline thermoplastic polymer film thus formed in the form of a film of substantially uniform thickness.

REFERENCES:
patent: 3223761 (1965-12-01), Raley
patent: 3322870 (1967-05-01), Sacks
patent: 3337665 (1967-08-01), Underwood et al.
patent: 3880691 (1975-04-01), Pannenbecker et al.
patent: 4379117 (1983-04-01), Baird, Jr. et al.
patent: 4415519 (1983-11-01), Strassel

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