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US 5,478,616 AGranted
Heat-sealable films and film laminates with an antistatic coating
AssigneeHoechst Aktiengesellschaft
InventorsKarl-Heinz Kochem, Michael Schmidt
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AssigneeHoechst Aktiengesellschaft
InventorsKarl-Heinz Kochem, Michael Schmidt
Estimating the term…
A weldable and/or heat-sealable, single- or multilayer film having at least one weldable and/or heat-sealable layer, the weldable and/or heat-sealable film being provided on at least one side on one outer surface with an antistatic coating, wherein the antistatic coating has a thickness of from about 0.005 to about 0.08 .mu.m and comprises at least about 60% by weight of a soluble, intrinsically electroconductive polymer which comprises structural units of the formula ##STR1## in which R.sup.1 is a C.sub.1 - to C.sub.12 - or a C.sub.6 - to C.sub.30 -alkoxy group, and which has a degree of polymerization of less than about 100, where the polymer or oligomer is in oxidized form and has an appropriate number of anions to compensate for the positive charge. These films are heat-sealable, in spite of their antistatic coating.
Film having an outer weldable or heat-sealable layer, wherein the weldable or heat-sealable layer has on an outer surface an antistatic coating having a thickness of about 0.005 .mu.m to about 0.08 .mu.m which comprises at least about 60% by weight of a soluble, intrinsically electroconductive polymer which comprises repeating units of the formula ##STR8## in which R.sup.1 is a (C.sub.1 to C.sub.30)-alkoxy group, and which has a degree of polymerization of less than about 100, and wherein the polymer is in oxidized form and contains anions to compensate for the positive charge.
An antistatically coated film, which comprises a base film on which is applied a heat-sealable layer, wherein an antistatic coating is applied on the heat-sealable layer, and wherein a seal seam strength after sealing of the heat-sealable layer is at least about 10 N/15 mm.
Dependencies are inferred from the claim text.