公开(公告)号：DE59702949D1

公开(公告)日：2001-03-01

申请号：DE59702949

申请日：1997-10-01

Applicant: BASF AG

Inventor： KROENER DR ,  KLANIG WOLFGANG ,  MORRISON DR ,  KLOSTERMANN DR ,  SCHOEPKE DR ,  KASTENHUBER WALTER

IPC: B01J19/18 ,  C08F2/00 ,  C08F2/22 ,  C08F12/08 ,  C08F14/06 ,  C08F14/08 ,  C08F18/08 ,  C08F20/00 ,  C08F36/06

Abstract: In a process for the preparation of homo or copolymers of at least one polymerisable monomer consisting of styrene, butadiene, vinyl chloride, vinyl acetate, vinylidene chloride, alkyl(meth)acrylate, meth(acrylic)acid, (meth)acrylonitrile or (meth)acrylamide by an emulsion polymerisation technique, reaction is carried out at at least 40 degrees C in the presence of a dispersing agent and a radical initiator such that at least 85 wt.% of the polymer is prepared by (a) mixing water, inert solvent and optionally dispersing agent and optionally a portion of the monomer, (b) adding initiator and (c) adding the rest of the monomer, optionally in the form of an emulsion with further water and optionally further dispersing agent or processing aids. Steps (a) and (b) or (b) and (c) may be carried out together at 40-120 degrees C and the resulting dispersion from each step or all the steps is recirculated around a flow loop external to the reaction vessel containing a low shear pump and a heat exchanger exhibiting a laminar flow profile. An apparatus for carrying out the reaction is also claimed and comprises means for storing and feeding reactants and processing aids, a reactor vessel with a heating/cooling mantle and means for draining, an external flow loop with a low shear pump and heat exchanger exhibiting a laminar flow profile and necessary connecting pipes.

公开(公告)号：DE59610398D1

公开(公告)日：2003-06-05

申请号：DE59610398

申请日：1996-09-25

Applicant: BASF AG

Inventor： RUPANER DR ,  SCHUMACHER DR ,  KIRCHNER DR ,  MORRISON DR ,  OFFNER ROLAND ,  SEYFFER DR

IPC: C08F220/18 ,  D04H1/4209 ,  D04H1/4218 ,  D04H1/4242 ,  D04H1/425 ,  D04H1/4258 ,  D04H1/43 ,  D04H1/4334 ,  D04H1/435 ,  D04H1/587 ,  D04H1/64 ,  D04H1/645 ,  D06M15/227 ,  D06M15/233 ,  D06M15/263 ,  D06M15/285 ,  D06M15/29 ,  D06M15/31 ,  D06M15/327 ,  D06M15/333 ,  D06M15/347 ,  D06M15/356 ,  G03C1/00 ,  G03C1/496

Abstract: A process for the prodn. of reusable fibre composite materials (FCM) contg. fibres (I) bonded together with a polymeric binder is claimed. The binder consists of an aq. dispersion of a polymer (II) which is film-forming at usage temps. and which goes entirely into soln. when the pH of the dispersion medium is changed. Also claimed is (i) material (FCM) obtd. by this process, esp. in the form of non-woven fabric or paper, and (ii) a process for recycling FCM, in which the FCM is treated with an aq. medium at a pH such that polymer (II) is dissolved to give fibres and binder soln., which are then sepd. and reused.