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:
Jul. 18, 1978
Filed:
Sep. 14, 1976
Applicant:
Inventors:
Ernest Jack Buckler, Sarnia, CA;
Michael Hugh Richmond, Sarnia, CA;
Assignee:
Polysar Limited, Sarnia, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65D / ; B32B / ;
U.S. Cl.
CPC ...
229 / ; 428441 ; 428497 ; 428494 ; 428158 ; 428304 ; 428308 ; 428454 ; 428310 ; 428515 ; 428516 ; 428451 ; 428517 ; 428519 ; 428443 ; 428538 ; 260 / ; 2608 / ; 260 4257 ; 521122 ; 521123 ;
Abstract
Thermoplastic polystyrene laminates are disclosed, one of the layers of which comprises a filled polystyrene composition containing from about 5 to about 50 of filler, such as calcium carbonate, clay, asbestos, etc. The filled polystyrene composition is prepared from a filled polystyrene masterbatch of impact polystyrene, filler, rubber and mineral oil, cut back by mixing with other polystyrene, either crystal or impact polystyrene. Laminates may be prepared by coextrusion. The filled polystyrene layer may be foamed. The laminates may be used for making formed articles such as cups, containers, trays, plates, sheets, etc.