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. 08, 1996
Filed:
Dec. 17, 1993
Applicant:
Inventors:
Zain E Saad, Midland, MI (US);
Carlton E Beyer, Midland, MI (US);
Assignee:
Dowbrands L.P., Indianapolis, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
26417714 ; 264211 ; 264514 ; 264515 ; 2642091 ; 264343 ; 264466 ;
Abstract
A coextruded multilayer film having increased retention of volatile antioxidants and process for making the film. The multilayer film includes an antioxidant layer containing a volatile antioxidant, said antioxidant layer being semipermeable to the volatile antioxidant; and a barrier layer, impermeable to the volatile antioxidant. The film can be produced on a conventional blown film process with the barrier layer coextruded externally to the antioxidant layer. The barrier layer traps the volatile antioxidant inside the tube of the blown film process, reducing the amount of volatile antioxidant migrating from the film.