TITLE: PEELABLE HEAT SEALABLE THERMOPLASTIC FILM.
European Patent Application EP0630319 A1

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: 12/28/1994
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

DOMESTIC PATENT REFERENCES:
EP0178061 Packaging film or sheet.
EP0213698 Polymer blends for packaging film and sheet.
EP0218332 Butene-1 polymer blends and films.
EP0246369 Butylene copolymer blend for form-and-fill film packaging.
EP0258527 Peelable film laminate.
EP0292197 Polymer blend for packaging film or sheet.
EP0510213 MULTILAYERED STRETCHABLE SHRINK FILM.
EP0515969 Biaxially oriented opaque multilayer sealable polypropylene
 film, process of preparation and use thereof.
EP0588223 Packaging film comprising a sealing layer and a substrate.

FOREIGN REFERENCES:
5084360 Packaging materials
4643945 Heat sealable blend of polypropylene terpolymers and linear low
  density polyethylene
GB2049707A

OTHER REFERENCES:
See also references of WO 9317863A1