A composition and method whereby the same group that is attached to or within the backbone of an associative thickener is reversibly switched between being hydrophilic and hydrophobic in nature. The group comprises a tertiary amine, or tertiary phosphine and has a hydrocarbon radical bonded to the amine nitrogen atom or phosphine phosphorus atom, which hydrocarbon radical is pendant to the backbone and contains fewer than 10 carbon atoms. When the group that is attached to or within the backbone is rendered hydrophilic, the aqueous thickener is pourable and readily incorporated into aqueous polymer compositions. When this group is rendered hydrophobic, the thickener performs its thickening function efficiently. Switching is readily accomplished by adjusting the pH of the associative thickener composition and the aqueous polymer composition being thickened.
一种构成和方法,其中与关联
增稠剂的主干相连或内部的相同基团可在亲
水性和疏
水性之间可逆地切换。该基团包括三级胺或三级膦,并且具有与胺氮原子或膦
磷原子结合的碳氢基团,该碳氢基团悬挂于主干上并且含有少于10个碳原子。当与主干相连的基团变为亲
水性时,
水性
增稠剂是可倾倒的并且容易混合在
水性聚合物组合物中。当这个基团变为疏
水性时,
增稠剂有效地完成其增稠功能。通过调整关联
增稠剂组合物和被增稠的
水性聚合物组合物的pH值,可轻松实现切换。