TITLE: PEELABLE HEAT SEALABLE THERMOPLASTIC FILM.
European Patent Application EP0630319 A4

ABSTRACT:
Abstract not available for EP0630319
Abstract of corresponding document: WO9317863
A base thermoplastic film has a coextruded or coated heat seal layer
formed from a polymer blend which provides good peel-apart heat seals.
When the film is sealed to itself, the seal opens by separation at the
original seal surface without film tear, or by delamination of the
sealant material from the primary HDPE film substrate without the
formation of strands extending between the two base film. The heat seal
layer which may be on one or both sides of the base layer comprises a
ternary blend of a random ethylene-propylene copolymer, a butene
polymer and a low density polyethylene. The films are cast, and
oriented in the solid state up to about two times in the machine
direction and six times or more in the transverse direction to give
films having good dead-fold and water vapor transmission rate
characteristics making them highly suited for packaging, particularly
for dry foods.

INVENTORS:
O'brien, Jeffrey James (US)
Sexton, Donald Francis (US)

APPLICATION NUMBER: EP19930907257
PUBLICATION DATE: 10/27/1994
FILING DATE: 03/04/1993

ASSIGNEE: MOBIL OIL CORP (US)
INTERNATIONAL CLASSES: B65D75/60; B29C55/12; B29C65/76; B32B27/00; B32B27/32; B65D65/40;
B65D75/58; C08F10/00; C08F10/02; C08F210/00; C08F210/16; B29K23/00;
B29L9/00; (IPC1-7): B32B7/12; C09J123/04; C09J123/16; C09J123/20
EUROPEAN CLASSES: B65D75/58F; B32B27/32