公开(公告)号：US4387181A

公开(公告)日：1983-06-07

申请号：US138750

申请日：1980-04-09

申请人： Robert A. Brown ,  Jesus L. Caamano ,  Henry A. Kasprzak

发明人： Robert A. Brown ,  Jesus L. Caamano ,  Henry A. Kasprzak

IPC分类号： C08G18/00 ,  C08G18/08 ,  C08G18/10 ,  C08G18/12 ,  C08G18/76 ,  C08G18/80 ,  C08L75/00 ,  C09D175/00 ,  C08J3/02 ,  C08L75/02 ,  C08L75/04

CPC分类号： C08G18/12 ,  C08G18/0823 ,  C08G18/0842 ,  C08G18/10

摘要： There are disclosed aqueous dispersions of salts, e.g., tertiary amine salts, of polyamine-extended, aromatic polyisocyanate-based prepolymers having carboxylic groups, especially such dispersions made from prepolymers of polyisocyanates in which the isocyanate groups are on different aromatic rings. These products, as well as, aqueous dispersions of salts of prepolymers of aromatic polyisocyanates can be made from blocked, aromatic polyisocyanate-based prepolymers, particularly oxime-blocked prepolymers. The polymer salts can have sufficient neutralized, carboxylic groups to provide stable, aqueous dispersions, and the dispersions of the polyamine-extended polymers have infinite dilutability with water and excellent resistance to gelling upon freezing and thawing. Carboxylic groups can be supplied to the prepolymers by reactants having two or more groups containing isocyanate-reactive hydrogen atoms employed in making the aromatic isocyanate prepolymers, particularly dihydroxy alkanoic acids. The polymer salts may be stably dispersed in the aqueous medium, even in the absence of substantial amounts of cosolvents, and the aqueous dispersions of the extended prepolymers are useful as, for instance, coatings for solid substrates to provide water resistance. The solvent resistance of coatings made from the polyamine-extended dispersions of polyether-derived prepolymers may be increased by using at least trifunctional amines to extend the prepolymers.

摘要翻译： 公开了具有羧基的多胺延伸的芳族多异氰酸酯基预聚物的盐例如叔胺盐的水分散体，特别是由异氰酸酯基团在不同芳环上的多异氰酸酯的预聚物制成的这种分散体。 这些产品以及芳族多异氰酸酯的预聚物的盐的水分散体可以由封闭的芳族多异氰酸酯基预聚物，特别是肟封端的预聚物制成。 聚合物盐可以具有足够中和的羧基以提供稳定的水分散体，并且多胺延伸的聚合物的分散体具有与水的无限可稀释性，并且在冷冻和解冻时具有优异的胶凝性。 可以通过在制备芳族异氰酸酯预聚物，特别是二羟基链烷酸中使用含有异氰酸酯反应性氢原子的两个或更多个基团的反应物，将羧酸基团提供给预聚物。 即使在没有大量共溶剂的情况下，聚合物盐也可以稳定地分散在水性介质中，并且扩展的预聚物的水分散体可用作固体基质的涂料以提供耐水性。 通过使用至少三官能胺延长预聚物可以增加由聚醚衍生的预聚物的多胺延伸分散体制成的涂料的耐溶剂性。