Extrusion-grade vinylidene chloride copolymer compositions and films prepared therefrom
AssigneeThe Dow Chemical Company
InventorsLloyd E. Lefevre, Fred Stevenson
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Abstract
A vinylidene chloride copolymer composition manufactured by the addition of a grease copolymer, such as low molecular weight ethylene-vinyl-acetate copolymer, in place of or in combination with conventional plasticizer blend additions.
Claims15
A high-cling thin film which comprises an extrudable copolymer resin having a major proportion of vinylidene chloride monomer with at least one other comonomer, and at least an effective cling-enhancing proportion of less than 10 weight percent of a grease copolymer having a peak molecular weight within the range from about 500 to about 7,500 as determined by gel permeation chromatography.
A method for preparing a vinylidene chloride copolymer composition having high-cling and reduced vinylidene chloride and/or vinyl chloride residuals, the process comprising the step of adding to the composition prior to polymerization a grease copolymer having a peak molecular weight within the range of from about 500 to 7,500 as determined by gel permeation chromatography, and polymerizing the copolymer composition with the in-monomer grease copolymer addition.
A plasticizer mixture comprising from about 20 to less than 100 parts by weight of a low molecular weight ethylene-vinyl acetate grease copolymer and from greater than zero parts to about 80 parts by weight of at least one non-polymeric ester.
Dependencies are inferred from the claim text.