公开(公告)号：ID19514A

公开(公告)日：1998-07-16

申请号：ID972535

申请日：1997-07-21

Applicant: BASF AG

Inventor： JOACHIM PAKUSCH ,  MAXIMILIAN ANGEL ,  JOACHIM ROSER ,  ANDREE DRAGON ,  HEINRICH SACK

IPC: C04B24/22 ,  C04B24/26 ,  C04B26/02 ,  C04B28/02 ,  C08J3/12 ,  C08L101/00 ,  C08K5/053 ,  C09F9/00

Abstract: Naphthalenesulfonic acid-formaldehyde condensates are used as assistants in the drying of aqueous polymer dispersions.Also described is a process for preparing polymer powders by drying, using these condensates; the polymer powders obtainable by the process; and their use as binders.

公开(公告)号：SG81903A1

公开(公告)日：2001-07-24

申请号：SG1996010967

申请日：1996-10-25

Applicant: BASF AG

Inventor： JOACHIM PAKUSCH ,  JURGEN TROPSCH ,  REINHOLD DIEING

IPC: C08L33/14 ,  C08F6/00 ,  C08F6/14 ,  C08J3/16 ,  C08L33/04 ,  C08L33/24 ,  C09D5/00 ,  C09D5/02 ,  C09J11/08 ,  C09J201/00

Abstract: The production of polymer powder comprises drying an aqueous dispersion of a polymer (A) in which the dispersed particles have a positive or negative electric charge on the surface. The process comprises adding, as auxiliary drying agent, a polyelectrolyte (B) which, in its dissociated form as poly-ion and counter-ion is soluble in the aqueous dispersion medium and in which the charge on the poly-ion is opposite to the surface charge on the dispersed polymer. Also claimed are: (i) the polymer powder obtained by this process; and (ii) the polymer powder containing charged spherical particles of (A) and a polyelectrolyte (B).