Foamable vinyl chloride resin composition
AssigneeKaneka Corporation
InventorsTakenobu Sunagawa, Mitsutaka Sato, Noriko Sakashita, Mamoru Kadokura
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Abstract
An expandable vinyl chloride resin composition that the expansion ratio of a vinyl chloride resin can be greatly increased by the use of thermally decomposable inorganic blowing agents without the use of organic solvent blowing agents, and which comprises 100 parts by weight of a vinyl chloride resin, 0.5 to 30 parts by weight of, as a processing aid, a (meth)acrylic acid ester polymer having a specific viscosity of not less than 0.73 measured at 30° C. with respect to a solution of 0.1 g of the polymer dissolved in 100 ml of chloroform, and not less than 0.3 to less than 2 parts by weight of a thermally decomposable inorganic blowing agent such as sodium bicarbonate.
Claims6
An expandable vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin, 0.5 to 30 parts by weight of, as a processing aid, a (meth)acrylic acid ester polymer having a specific viscosity of not less than 0.73 measured at 30° C. with respect to a solution of 0.1 g of the polymer dissolved in 100 ml of chloroform, and not less than 0.3 part by weight to less than 2 parts by weight of a thermally decomposable inorganic blowing agent, said composition containing no organic solvent blowing agent, wherein the resultant expandability ratio is not less than 5:1, expandability being defined as (specific gravity of non-foamed molding)/(specific gravity of foamed molding).
Dependencies are inferred from the claim text.