The present invention relates to a composition comprising a hydrophobically modified alkylene oxide urethane polymer with pendant or end-capping tertiary amine groups, the conjugate acids of which have a pKa in the range of about 4.5 to about 6.5. The composition of the present invention is useful as a rheology modifier for paint formulations formulated over a wide pH range and is more stable to heat aging than higher pKa amine-modified HEURs.
本发明涉及一种组合物,该组合物包含一种疏
水改性的环氧亚烷基聚
氨酯聚合物,该聚合物具有悬垂或端封的叔胺基团,其共轭酸的 pKa 值在约 4.5 至约 6.5 之间。本发明的组合物可用作涂料配方的流变改性剂,适用于较宽的 pH 值范围,与 pKa 值较高的胺改性 HEUR 相比,本发明的组合物对热老化更稳定。