公开(公告)号：US3987218A

公开(公告)日：1976-10-19

申请号：US478425

申请日：1974-06-11

申请人： Heinz Haschke ,  Gerhard Morlock ,  Peter Kuzel ,  Horst Kruger

发明人： Heinz Haschke ,  Gerhard Morlock ,  Peter Kuzel ,  Horst Kruger

IPC分类号： C08J3/00 ,  B05D7/00

CPC分类号： C08J3/00 ,  C08J2300/104 ,  Y10T428/2998

摘要： A process for decreasing the hygroscopicity of a polycarboxylate, said process comprising preparing a melt of a composition having a melting point of about 40.degree. - 120.degree. C, said composition giving an acid or neutral pH in an aqueous solution or suspension, said composition being less hygroscopic than said polycarboxylate, said composition capable of being free flowing under equilibrium conditions at about 30.degree. C and in an air atmosphere of at least about 40% relative humidity; heating said melt in a mixer to a temperature of up to about 140.degree. C; gradually adding said polycarboxylate as a powder to said melt while mixing said melt; wherein said composition comprises at least about 3 and at most about 40% by weight of the mixture resulting after all polycarboxylate has been added to said melt.