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1. (WO2017034556) PACKAGING TRAY WITH CAPPING LAYER

Pub. No.:    WO/2017/034556    International Application No.:    PCT/US2015/046860
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Aug 27 01:59:59 CEST 2015
IPC: B32B 27/36
Applicants: BEMIS COMPANY, INC.
Inventors: LIU, Jiancheng
THEOBALD, Tyler, J.
CLEMENTS, James, W.
GRUETZMACHER, Ross, K.
BERBERT, Otacilio, T.
NELSON, Kevin, P.
Title: PACKAGING TRAY WITH CAPPING LAYER
Abstract:
The present invention is directed to rigid or semi-rigid trays having a bulk layer comprising a crystalline aromatic polyester and a capping layer which is in direct contact with the bulk layer. The capping layer comprises a copolymer having a first structural repeating unit of ethylene and a second structural repeating unit selected from the following: (i) an acrylate-based moiety: fit) at least 12% by weight relative to the total weight of the copolymer of vinyl acetate; and (iii) an anhydride or carboxylic acid. It has been discovered that the bulk layer and the capping layer of the present invention can be readily co-extruded together and have sufficient bond strength to each other despite their chemical dissimilarity. In some preferred embodiments, the capping layer acts as a heat seal layer and is formulated to heat seal to conventional polyolefin-based lidstock.