Reducing blocking of polyethylene films using ethylene polymer latex - without altering optical properties or processing of film

摘要

The tendency of polyethylene films to stick together is reduced by applying to the film a 0.01-10 (0.01-5) wt. % dispersion of an ethylene polymer with melt index 0.1-50 g/10 minutes and with particles 5 mu and drying the film by evapn. of the water. The film is esp. of a low-density polyethylene (0.91-0.93 g/cc). The latex contains a polyethylene of density 0.918-0.935 g/cc, or a copolymer contg. 50-99.9 (90-99.9) moles % ethylene and 50-0.1% of a comonomer, esp. 10-0.1% of an acrylate ester, in partic. n-butyl or 2-ethylhexyl acrylate. The latex may contain a dispersant, e.g. 0.1-5 wt. % of a Na alkylsulphonate, and has pH 3-12 (5-11). The particle size is pref. 1 (0.01-1) mu. The optical properties, e.g. gloss, of the film are not affected. The dispersion coating adheres well to the film and does not affect processing.