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US 6,503,611 B1Granted
Cold seal release biaxially oriented polypropylene film for packaging with stable release properties
AssigneeToray Plastics (America), Inc.
InventorsKeunsuk P. Chang, A. Michael Nahmias
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Abstract
A polypropylene film contains a non-migratory slip and release additive package of a synthetic or mineral wax, an aluminosilicate additive, and optionally a silicone oil and a crosslinked silicone polymer resin. This film has excellent and stable cold seal adhesive release properties and exhibits a marked improvement in stable slipperiness, excellent transparency, excellent printability, and no cold seal adhesive deadening.
Claims12
A two-layer laminate film having a treated surface and an untreated cold seal release surface and comprising:
- a) a first resin layer comprising a polyolefin resin and having thereon the treated surface treated by a discharge treatment method that imparts printability to the treated surface;
- and
- b) a second resin layer formed on and adhered to a surface of the first resin layer opposite the treated surface and providing the cold release surface,
- the second resin layer comprising resin, a first additive material in an amount of 2-10% by weight of the second resin layer, and a second additive in an amount of about 0.10-0.50% by weight of the second resin layer, in which the resin of the second resin layer consists essentially of polypropylene, the first additive material is at least one component selected from the group consisting of synthetic waxes and mineral-derived waxes and the second additive comprises an amorphous aluminosilicate.
1 more element
Dependencies are inferred from the claim text.