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:
Jan. 18, 1994
Filed:
Sep. 09, 1992
Applicant:
Inventors:
Jean P Leca, Mantes la Jolie, FR;
Jean Y Barbin, Etrepagny, FR;
Assignee:
Norsolor, , US;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B32B / ;
U.S. Cl.
CPC ...
428174 ; 428215 ; 428218 ; 428516 ; 428519 ; 428520 ; 428352 ; 428 42 ;
Abstract
A process for thermoforming a sheet of poly(methyl methacrylate) which has a reduced viscosity of at least 1.5, protected on at least one of its faces, by a ethylene polymer film, in intimate contact with it, and which has undergone a corona discharge treatment. The protective film of ethylene polymer has a density not exceeding 0.935 and a melt index lower than 1.0 g/10 min. The ethylene polymer film can be coated with a layer of acrylic adhesive after the ethylene polymer film has undergone the corona treatment.