Inventors:
John Maligie - Long Beach CA
Thomas Malter - Huntington Beach CA
Assignee:
Airtech International, Inc. - Huntington Beach CA
International Classification:
B32B 2736
US Classification:
428412, 428516, 428520, 4284769, 4284758, 428483, 4284761, 4284763, 4284744, 15624411, 156325, 156326, 156327, 427508, 427487, 264319, 264330, 2643314, 26433115, 26433118, 26433121
Abstract:
This invention relates to a method for molding or curing a resin material using a multilayer release film as a barrier at the surface of the resin material. In one embodiment, the method comprises the surface of the resin material being in contact with the release film at a temperature of at least about 350Â F. (about 180Â C. ). Here, the release film is non-oriented and comprises: (1) an enhancement layer which comprises a thermoplastic material; and (2) a first release layer which has a composition that is different from the enhancement layer, comprises a polymeric material, and is releasable from the resin material after the resin material is molded or cured. This invention also relates to a release film that may be used, for example, with the above method. In one embodiment, the release film comprises 5 layers in the following order: (1) a first release layer which comprises polymethylpentene; (2) a first tie layer which comprises (i) polyethylene or modified polyethylene, and (ii) polypropylene or modified polypropylene; (3) an enhancement layer which comprises polyamide; (4) a second tie layer which comprises (i) polyethylene or modified polyethylene, and (ii) polypropylene or modified polypropylene; and (5) a second release layer which comprises polymethylpentene.