Title:
METHOD FOR PRODUCING POLYMER STABILIZED WITH POLYVINYL ALCOHOL AND USE OF PRODUCT BY THE SAME METHOD
Document Type and Number:
Japanese Patent JP3574796
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a polymer stabilized with polyvinyl alcohol based on a vinyl ester, ethylene and, as necessary, further a comonomer in the form of an aqueous polymer dispersion or a water-redispersible polymer powder by the radically initiated continuous emulsion polymerization and, as necessary, drying of the resultant polymer dispersion.
SOLUTION: The emulsion polymerization is carried out at 40-100°C temperature under 5-100 bars pressure in (a) at least two continuously connected pressurized reactors until the residual monomer content reaches less than about 3 mass% and is subsequently continued at 20-60°C temperature and under <1.0 bar pressure in at least one reactor under atmospheric pressure, wherein (b) the polymerization is initiated by using a redox system comprising an oxidizing component and a reducing component, where the reducing component is at least partially fed to the first reactor in the process.
Inventors:
Hans-Peter Weizel
Application Number:
JP2001218669A
Publication Date:
October 06, 2004
Filing Date:
July 18, 2001
Export Citation:
Assignee:
Wacker Polymer Systems GmbH & Co. KG
International Classes:
C08F2/00; C08F2/01; C08F2/16; C08F2/22; C08F216/06; C08F218/02; C08F218/04; C08F263/04; C08L23/08; C08L51/00; C09D123/04; C09D129/04; C08J3/12; C09D131/00; C09D151/00; C09J123/04; C09J129/04; C09J131/00; C09J151/00; C08F218/08; C08L29/04; (IPC1-7): C08F2/22; C08F2/00; C08F2/01; C08F218/02; C08J3/12; C09D123/04; C09D129/04; C09D131/00; C09J123/04; C09J129/04; C09J131/00
Domestic Patent References:
| JP54145783A | ||||
| JP51075785A |
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel