申请人:Aert Van Huub
公开号:US20050020787A1
公开(公告)日:2005-01-27
A method has been disclosed of preparing ultrafine hydrophobic latex particles of polymers and copolymers by free radical emulsion polymerization in a water-based system, making use therefor, in order to polymerize or copolymerize monomers or monomer mixtures respectively, of at least one compound selected from the group consisting of dimers and cobalt complexes, acting as a chain transfer agent (CTA), wherein said latex particles have an average particle size of less than 100 nm, being more than 10% lower than if prepared in the absence of said CTA, characterized in that said polymerization is conducted in a water-based reaction in the presence of a chain transfer agent and of a surfactant, wherein said surfactant is present in a concentration versus said monomer or monomer mixture of from 5 up to 25% by weight for a non-ionic surfactant or from 0.05 up to 10% by weight for an ionic surfactant, more particularly a surfactant in a concentration below twice its critical micelle concentration.
一种制备超细疏水乳胶聚合物和共聚物颗粒的方法已经被披露,该方法通过自由基乳液聚合在水基体系中使用二聚体和钴络合物等化合物作为链转移剂(CTA)来聚合或共聚单体或单体混合物,其中所述乳胶颗粒具有平均粒径小于100纳米,比在无CTA存在的情况下制备的平均粒径低至少10%,其特征在于所述聚合是在水基反应中,在链转移剂和表面活性剂的存在下进行的,其中所述表面活性剂在非离子表面活性剂的情况下与所述单体或单体混合物的浓度比为5%至25%重量,或在离子表面活性剂的情况下与所述单体或单体混合物的浓度比为0.05%至10%重量,更具体地说,是在其临界胶束浓度以下的浓度下的表面活性剂。