Antistatic films

Claim 1

A multiple-layer, heat-set, antistatic film having a biaxially oriented substrate layer of a propylene polymer and, on at least one of the two surfaces thereof, a heat-sealable layer of an olefin polymer melting in a temperature range below the melting temperature of the substrate polymer, said heat-sealable layer having on the external surface thereof remote from said substrate layer a composition comprising, based on the total weight of the film, (a) from 0.005 to 0.25 weight % of a quaternary ammonium compound of the formula ##STR4## wherein each of R 1 , R 2 , and R 3 , which may be the same or different, is a hydrogen atom or a lower alkyl radical containing from 1 to 6 carbon atoms, or R 1 and R 2 are each methylene groupings within a common five- or six-membered saturated heterocyclic ring, Z is a methylene group when R 4 is a hydrogen atom or an acyl radical containing up to 15 carbon atoms, or Z is a carbonyl group when R 4 is a hydrogen atom, and X is a univalent anion or an equivalent of a multivalent anion, (b) from 0.005 to 0.5 weight % of an organic polyol containing at least two free hydroxyl groups and of general formula ##STR5## wherein each of R' and R", which may be the same or different, is hydrogen or an acyl radical containing from 2 to 20 carbon atoms, X is --H or --CH 2 OR', Y is --OH or --CH 2 OR', and n is an integer from 1 to 10, and (c) from 0.025 to 0.5 weight % of a glyceride of a saturated fatty acid containing up to 22 carbon atoms in its molecule.