AMPHIPHILIC COPOLYMERS AS SURFACE MODIFIERS FOR PRODUCTION OF IMPROVED CALCIUM CARBONATE POWDERS

This disclosure describes a process for producing a surface-modified calcium carbonate, the process comprising contacting a calcium carbonate or precursor thereof with at least one amphiphilic copolymer comprising hydrophilic subunits and hydrophobic subunits, in which the hydrophilic subunits derive from at least one ethylenically-unsaturated compound comprising a carboxylic acid group or salt orderivative thereof;the hydrophobic subunits derive from at least one ethylenically-unsaturated compound comprising a hydrophobic group; and the amphiphilic copolymer has a hydrophilic-lipophilic balance ranging from about 1 to about 40. Surface-modified calcium carbonates obtained from the process are also described, as well as compositions containing the surface-modified calcium carbonates. 本公开描述了一种制备表面改性的碳酸钙的方法，该方法包括使碳酸钙或其前体与至少一种包含亲水亚单元和疏水亚单元的两亲性共聚物接触，其中，所述亲水亚单元源自至少一种包含羧酸基团的烯键式不饱和化合物或其盐或衍生物；所述疏水亚单元源自至少一种包含疏水基团的烯键式不饱和化合物；并且所述两亲性共聚物的亲水亲脂平衡值为约1至约40。还描述了由该方法获得的表面改性的碳酸钙以及含有所述表面改性的碳酸钙的组合物。