| 摘要 |
ABSTRACT - 599088 The disclosure relates to film comprising (A) at least one moisture barrier layer comprising a polymer blend comprising (a) high density polyethylene in an amount from about 69 % about 90 % by weight of the blend, wherein the high density polyethylene has a melt index of at least 1.0 g/10 min and a density greater than 0.958 g/cc; (b) hydrocarbon resin in an amount from about 5 % about 30 % by weight of the blend, wherein the hydrocarbon resin comprises petroleum resins, terpene resins, styrene resins, cyclopentadiene resins, saturated alicyclic resins or blends thereof; and (c) nucleating agent in an amount from about 0.01 % to about 1 % by weight of the blend, wherein the nucleating agent comprises glycerol alkoxide salts, hexahydrophthalic acid salts, similar salts or blends thereof; and (B) at least one additional layer comprising an ionomer, a high density polyethylene, a polyester, a styrene butadiene copolymer or blends thereof; wherein the film has normalized moisture vapour transmission rate of no greater than 0.30 g-mil/100 in2/day measured at about 100 °F and 90 % external relative humidity. These films are tear-resistance and chlorine-free that have no significant sticking, forming, cutting, filling or sealing issues, which makes them suitable as packaging sheets that can be thermoformed into articles, such as trays, cups, etc., which may then be used to package food, non-food, medical and industrial products.
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