Method of producing films from polyethylene resin, an additive and a second polymeric resin
AssigneeMobil Oil Corporation
InventorsDavid V. Dobreski, Jack J. Donaldson, Bruce E. Nattinger
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Abstract
There is disclosed a modified method of preparing a blown polyethylene film made from a blend of major proportion of a polyethylene resin, e.g., LLDPE, a minor proportion of a second polymeric resin, e.g., polystyrene, and at least one additive, e.g., a colorant. The additive or additives are mixed with the second polymeric resin and the resulting mixture is then blended with the polyethylene resin, thereby reducing the number of process steps. Also disclosed is a method of monitoring and/or controlling the second polymeric resin content in the film made with known proportions of a colorant and the second polymeric resin by measuring the light transmission of the film.
Claims31
A method of preparing a blown polyethylene film from a major proportion of a polyethylene resin, a minor proportion of a second polymeric resin, which is a thermoplastic polymer of styrene, para-methylstyrene or a polyamide, and at least one additive comprising blending the polyethylene resin with a separately-prepared mixture (masterbatch) of the second polymeric resin and said at least one additive and extruding the resulting blend.
Dependencies are inferred from the claim text.