The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 1989
Filed:
Dec. 24, 1987
Applicant:
Inventors:
Jean-Claude Moulies, Serquigny, FR;
Gerard Reignier, Serquigny, FR;
Assignee:
Atochem, Paris La Defense, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264514 ; 264166 ; 264173 ; 4251331 ; 4253261 ; 425462 ;
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.