The present invention relates to a process comprising the steps of a) contacting an aqueous dispersion of a TiO2 slurry containing adsorbing dispersant with an adsorbing latex to form a mixture, wherein the pH of the mixture of the TiO2 slurry and adsorbing latex are sufficiently high to inhibit interaction between the TiO2 and the adsorbing dispersant; then b) lowering the pH of the mixture of step a) sufficiently to promote interaction between the TiO2 and the adsorbing latex, thereby forming a composite; wherein the adsorbing latex comprises structural units of itaconic acid or a salt thereof. The process of the present invention provides for improved hiding and reduced grit for coatings compositions.
本发明涉及一种工艺,包括以下步骤 a) 将含有吸附分散剂的
二氧化钛浆料的
水分散液与吸附胶乳接触,形成混合物,其中
二氧化钛浆料和吸附胶乳混合物的 pH 值足够高,以抑制
二氧化钛和吸附分散剂之间的相互作用;然后b)充分降低步骤a)的混合物的pH值,以促进TiO2和吸附胶乳之间的相互作用,从而形成复合材料;其中吸附胶乳包括
衣康酸或其盐的结构单元。本发明的工艺提高了涂料组合物的遮盖力并减少了砂粒。