申请人:THE DOW CHEMICAL COMPANY
公开号:EP0019716A1
公开(公告)日:1980-12-10
Lightweight coated paper products with improved properties are obtained by use of coating compositions employing as the binder component certain novel polymeric dispersions which comprise (A) a major proportion on a dry basis of an alkali-insoluble polymer and (B) a minor proportion (e.g., from 0.5 to 25 weight percent on a dry basis based upon the alkali-insoluble polymer) of certain alkali-soluble polymers. Exemplary of the alkali-insoluble polymers employed are carboxylated and noncarboxylated addition polymerized synthetic polymers having a glass transition temperature of about 50° C or less. Exemplary of the alkali-soluble polymers are synthetic addition polymers comprising in polymerized form (1) about 40 to 90 weight percent of a vinyl ester of a carboxylic acid (e.g., vinyl acetate, vinyl propionate, etc.); (2) about 5 to 55 percent of the nitrile, C2-C. hydroxyalkyl ester, or C1-C8 alkyl ester of a monoethylenically unsaturated carboxylic acid; and (3) about 5 to 15 percent of a monoethylenically unsaturated carboxylic acid.
通过使用某些新型聚合物分散体作为粘合剂成分的涂层组合物,可获得性能更好的轻质涂布纸产品,这些聚合物分散体包括(A)以干基为基准的主要比例的碱不溶性聚合物和(B)以干基为基准的次要比例(例如,以碱不溶性聚合物为基准的 0.5 至 25 重量百分比)的某些碱溶性聚合物。所使用的碱不溶性聚合物示例为羧化和非羧化加成聚合合成聚合物,其玻璃化温度约为 50 摄氏度或更低。碱溶性聚合物的范例是合成加成聚合物,其聚合形式包括 (1) 约 40 至 90 重量百分比的羧酸乙烯基酯(例如:乙酸乙烯基酯); (2) 约 40 至 90 重量百分比的羧酸乙烯基酯(例如:乙酸乙烯基酯); (3) 约 40 至 90 重量百分比的羧酸乙烯基酯(例如:乙酸乙烯基酯)、乙酸乙烯酯、丙酸乙烯酯等);(2) 约 5-55%的单乙烯基不饱和羧酸的腈基、C2-C. 羟基烷基酯或 C1-C8 烷基酯;以及 (3) 约 5-15%的单乙烯基不饱和羧酸。