Multi-layer films having improved sealing properties

摘要

Multi-layer laminated structures are disclosed. Such structures include a multi-layer polymeric film having a Layer A that includes at least one polymer and a polymeric sealant layer adjacent to Layer A. The sealant layer has a surface roughness, Ra>5.0 and a Peak Count Value, Pc>50.0. The multi-layer laminated structures also include a substrate in surface contact with the multi-layer polymeric film, typically opposite the sealant layer. Such structures have a top seal and/or side seal of the polymeric sealant layer to itself has a seal strength of >5.00×102 grams/inch at 177° C. The multi-layer films may be transparent, contain a cavitating agent, or are pigmented to form an opaque film. Also, the multi-layer film may be metallized or coated with a barrier coating.

主权项

1. A mufti-layer laminated structure, comprising:
(a) a mufti-layer polymeric film, comprising:
i) a core layer comprising polypropylene and having a first surface and a second surface;ii) a sealant layer comprising an incompatible blend adjacent the first surface of the core layer, the sealant layer having a surface roughness, Ra>5.0 and a Peak Count Value, Pc>50.0, the incompatible blend comprising ethylene-propylene-butylene terpolymer with at least polyethylene and having a 45° surface gloss of ≦75% (ASTM-D-523);iii) a first tie layer consisting of a soft polymer having a flexural modulus of ≦about 60 kpsi (413 MPa) and having a first surface and a second surface, the second surface of the first tie layer adjacent the first surface of the core layer; and (b) a substrate in surface contact with the multi-layer polymeric film, wherein a top seal and/or side seal of the polymeric sealant layer to itself has a seal strength of greater than about 20.0×102 grams/inch at 177° C.