公开(公告)号：WO2007074167A2

公开(公告)日：2007-07-05

申请号：PCT/EP2006070250

申请日：2006-12-28

Applicant: BASF AG ,  STUEVEN UWE ,  DANIEL THOMAS ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS ,  VAN ESBROECK DOMINICUS ,  POSSEMIERS KARL ,  HILLEBRECHT ANNEMARIE

Inventor： STUEVEN UWE ,  DANIEL THOMAS ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS ,  VAN ESBROECK DOMINICUS ,  POSSEMIERS KARL ,  HILLEBRECHT ANNEMARIE

CPC classification number: C08F2/44 ,  C08F220/06 ,  C08F222/1006

Abstract: The invention relates to a method for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, in a reactor. According to said method, at least one first fraction of a particulate additive is admixed to the reaction mixture before the reaction mixture reaches a dwell time of 40 % of the total dwell time in the reactor, and at least one second fraction of a particulate additive is admixed when the reaction mixture reaches a dwell time of 45 % or more of the total dwell time in the reactor. The additive is selected from the group of water-adsorbing resin powders, fillers and mixtures thereof, the total solids content of the monomer and the additive being 30 to 60 % by weight, the amount of the additive being 5 to 50 % by weight, based on the monomer, and the weight ratio of the first fraction to the second fraction of the additive being 10:1 to 1:5. The resin powder is constituted of, e.g., recycled fines. Bot the residual monomer content, especially the residual cross-linker content, and the content in extractable substances of the water-absorbing resin are reduced by the described manner of admixture. A high percentage of additives can be incorporated without deteriorating the properties of the water-absorbing resin so obtained. The additives form a sufficiently strong compound with the resin without excessive dust formation when the resin is exposed to mechanical stress.

Abstract translation: 本发明涉及一种方法，用于通过反应混合物的聚合制造的吸水性树脂，任选地包含在反应器中的至少一种亲水性单体和至少一种交联剂，其中，所述反应混合物中之前至少一个微粒添加剂的第一部分干涉在反应混合物中 的在反应器中，并用颗粒添加剂的至少一个第二部分的总停留时间的40％达到停留时间，当反应混合物已达到的在反应器中的总停留时间为45％以上的停留时间，其中所述添加剂的吸水性树脂粉末，填料和它们的混合物 被选择，单体和添加剂的30至60重量％，添加剂5至50重量％的量存在，基于单体的总固体含量，并且所述第一部分的所述添加剂的所述第二部分的重量比为10：1的 15至 1：5。 树脂粉末是z。 B.回收的罚款。 通过所述的添加方式，残余单体含量，特别是残余交联剂含量和吸水性树脂的可萃取物的含量都降低。 可以掺入高比例的添加剂而不降低所得吸水性树脂的性能。 添加剂与树脂结合得足够牢固，因此在机械应力下不会发生过多的粉尘

公开(公告)号：DE102005031114A1

公开(公告)日：2007-01-18

申请号：DE102005031114

申请日：2005-07-04

Applicant: BASF AG

Inventor： HILLEBRECHT ANNEMARIE ,  STUEVEN UWE ,  MIERT LEO ,  ESBROECK DOMINICUS VAN ,  BRIAN BERND ,  CHSZANIECKI SIEGFRIED

IPC: C08J3/00 ,  B01F7/04 ,  B01F7/08 ,  B01F15/02 ,  B01J4/00 ,  B29B7/46 ,  B29B7/88 ,  C08F2/44

Abstract: The invention relates to the use of an apparatus for adding at least one solid or viscous liquid additive, or an additive dispersed in solvent, to a reactor interior of a reactor for preparing crosslinked, finely divided polymers by copolymerizing (a) water-soluble, monoethylenically unsaturated monomers and (b) from 0.001 to 5 mol %, based on the monomers (a), of monomers comprising at least two polymerizable groups, (c) from 0 to 20 mol %, based on the monomers (a), of water-insoluble monoethylenically unsaturated monomers, where the apparatus comprises at least one screw for conveying the at least one additive and the at least one screw ends in an addition orifice substantially flush with the inner wall of the reactor interior.