Patent ID: 6455150
Filing Date: 2002-09-24
Classification: B32B,Y10T

Abstract:
A heat-sealable, multilayer film structure, comprising:(a) an upper heat-sealable layer having a surface-treated external surface which is printable, sealable, and machinable, the upper heat-sealable layer comprising (i) an olefin selected from the group consisting of an ethylene-propylene-butene- 1 terpolymer, an ethylene-propylene random copolymer, a linear low density polyethylene, a low density polyethylene, a medium density polyethylene, a high density polyethylene, and blends thereof, and (ii) a particulate, crosslinked, hydrocarbyl-substituted polysiloxane having a mean particle size of from about 0.5 &mgr;m to about 20.0 &mgr;m, as a combined slip agent and antiblock; (b) an intermediate layer comprising a propylene polymer; and (c) a lower heat-sealable layer having an external surface which is sealable and machinable, the lower heat-sealable layer consisting essentially of (i) an olefin selected from the group consisting of an ethylene-propylene-butene-1 terpolymer, an ethylene-propylene random copolymer, a linear low density polyethylene, a low density polyethylene, a medium density polyethylene, a high density polyethylene, and blends thereof, (ii) a particulate, crosslinked, hydrocarbyl-substituted polysiloxane having a mean particle size of from about 0.5 &mgr;m to about 20.0 &mgr;m, as a combined slip agent and antiblock, and (iii) from about 0.15 wt% to about 1.5 wt% of a liquid, hydrocarbyl-substituted polysiloxane, wherein the upper heat-sealable layer (a) does not comprise a liquid, hydrocarbyl-substituted polysiloxane, and the external surface of the upper heat-sealable layer (a) optionally has a coating of a liquid, hydrocarbyl-substituted polysiloxane transferred thereto from the liquid, hydrocarbyl-substituted polysiloxane contained in the lower heat-sealable layer (c).