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1. 发明申请

US20230140735A1 Process for Preparing Aqueous Polymer Dispersions 有权
公开(公告)号：US20230140735A1
公开(公告)日：2023-05-04
申请号：US17916218
申请日：2021-03-22
申请人： Covestro (Netherlands) B.V.
发明人： Jurgen Scheerder , Remy Paul Marie Dollekens
IPC分类号： C09D125/14 , C09D5/02 , C09D7/42
摘要： A process for preparing an aqueous polymer dispersion, wherein the process comprising free-radically initiated emulsion polymerization in an aqueous medium, in the presence of at least one vinyl polymer A, to obtain a polymer B comprising a vinyl polymer phase B1 with a glass transition temperature of from −20 to +15° C. and a vinyl polymer phase B2 with a glass transition temperature of from +50 to +110° C., with the proviso that the difference in glass transition temperature between polymer B1 and polymer B2 is at least 40° C., wherein the weight ratio of polymer B1 to polymer B2 is from 80:10 to 10:20, wherein the at least one polymer A is obtained by a process comprising: free-radically initiated bulk or solution polymerizing of: from 5 to 25 wt. % of at least one carboxylic acid functional ethylenically unsaturated monomer A1, and from 75 to 95 wt. % of at least one ethylenically unsaturated monomer A2 different than monomer A1, where the amounts are given relative to the total weight of monomers charged in the polymerization to prepare the vinyl polymer A, wherein the weight average molecular weight of the polymer A is lower than the weight average molecular weight of the polymer B, and wherein the weight ratio of polymer A to polymer B is from 10:90 to 40:60.

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