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1. (WO1998050212) TWO-STEP METHOD FOR DEHYDRATING PLASTIC DISPERSIONS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/050212 International Application No.: PCT/EP1998/002005
Publication Date: 12.11.1998 International Filing Date: 07.04.1998
Chapter 2 Demand Filed: 30.11.1998
IPC:
B29B 15/04 (2006.01) ,B29C 47/50 (2006.01) ,B29C 47/76 (2006.01) ,C08F 6/00 (2006.01) ,C08F 6/22 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B
PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
15
Pretreatment of the material to be shaped, not covered by groups B29B7/-B29B13/117
02
of crude rubber, gutta-percha, or similar substances
04
Coagulating devices
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
47
Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
08
Component parts, details or accessories; Auxiliary operations
36
Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
38
using screws
50
using at least two screws, one after the other, e.g. multi-stage plasticisers
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
47
Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
08
Component parts, details or accessories; Auxiliary operations
36
Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
58
Details
76
Venting or degassing means
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
6
Post-polymerisation treatments
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
6
Post-polymerisation treatments
14
Treatment of polymer emulsions
22
Coagulation
Applicants:
RÖHM GMBH [DE/DE]; Kirschenallee D-64293 Darmstadt, DE (AL, AM, AT, AU, AZ, BA, BB, BE, BF, BG, BJ, BR, BY, CA, CF, CG, CH, CI, CM, CN, CU, CY, CZ, DE, DK, EE, ES, FI, FR, GA, GB, GE, GH, GM, GN, GR, GW, HU, ID, IE, IL, IS, IT, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MC, MD, MG, MK, ML, MN, MR, MW, MX, NE, NL, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, SN, SZ, TD, TG, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZW)
VETTER, Heinz [DE/DE]; DE (UsOnly)
SCHIKOWSKY, Hartmut [DE/DE]; DE (UsOnly)
HÖSS, Werner [DE/DE]; DE (UsOnly)
Inventors:
VETTER, Heinz; DE
SCHIKOWSKY, Hartmut; DE
HÖSS, Werner; DE
Priority Data:
197 18 597.502.05.1997DE
Title (DE) ZWEISTUFIGES VERFAHREN ZUR ENTWÄSSERUNG VON KUNSTSTOFFDISPERSIONEN
(EN) TWO-STEP METHOD FOR DEHYDRATING PLASTIC DISPERSIONS
(FR) PROCEDE A DEUX ETAPES POUR EXTRAIRE L'EAU CONTENUE DANS DES DISPERSIONS DE MATIERES PLASTIQUES
Abstract:
(DE) Verfahren zum Entwässern eines zweiphasigen flüssigen Gemischs aus einer thermoplastischen Kunststoffschmelze und einer Wasserphase durch a) Koagulation des zweiphasigen flüssigen Gemischs in einem ersten Extruder, b) Entwässerung des Koagulats in einem Doppelschneckenextruder mit gegenläufigen Schnecken mit einer Entwässerungszone und c) Abtrennen flüchtiger Bestandteile durch Entgasung dadurch gekennzeichnet, daß in der Stufe a) als erster Extruder ein Einschneckenextruder oder ein Doppelschneckenextruder mit gleichläufigen Schnecken eingesetzt wird.
(EN) The invention relates to a method for dehydrating a two-phase liquid mixture consisting of a thermoplastic synthetic melt phase and an acqueous phase, comprising the following steps: a) coagulation of the two-phase liquid mixture in a first extruder; b) dehydration of the coagulate in a twin screw extruder with a de-watering zone and screws working in an opposite direction; c) separation of constituents by degasifying. The inventive method is characterized in that a single screw extruder or a twin screw extruder with screws working in the same direction is used as a first extruder in step a).
(FR) L'invention concerne un procédé permettant d'extraire l'eau contenue dans un mélange liquide à deux phases, comprenant une matière plastique en fusion et une phase aqueuse, par a) coagulation du mélange liquide à deux phases dans une première extrudeuse; b) extraction de l'eau contenue dans le coagulat dans une boudineuse à deux vis, à vis contraires avec une zone d'extraction d'eau et c) séparation de constituants volatils par dégazage. Ce procédé se caractérise en ce qu'au cours de l'étape a), la première extrudeuse utilisée est une boudineuse à une vis ou une boudineuse à deux vis, à vis placées dans le même sens.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: German (DE)
Filing Language: German (DE)
Also published as:
MXPA/a/1999/009924EP0979162US6287470JP2001523179 CA2288803AU1998072146