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1. (WO1991007351) SILICA SOLS, A PROCESS FOR THE PRODUCTION OF SILICA SOLS AND USE OF THE SOLS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007351 International Application No.: PCT/SE1990/000690
Publication Date: 30.05.1991 International Filing Date: 24.10.1990
Chapter 2 Demand Filed: 02.05.1991
IPC:
C01B 33/148 (2006.01) ,D21H 17/68 (2006.01)
C CHEMISTRY; METALLURGY
01
INORGANIC CHEMISTRY
B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
33
Silicon; Compounds thereof
113
Silicon oxides; Hydrates thereof
12
Silica; Hydrates thereof, e.g. lepidoic silicic acid
14
Colloidal silica, e.g. dispersions, gels, sols
146
After-treatment of sols
148
Concentration; Drying; Dehydration; Stabilisation; Purification
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
17
Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
63
Inorganic compounds
67
Water-insoluble compounds, e.g. fillers, pigments
68
siliceous, e.g. clays
Applicants:
EKA NOBEL AB [SE/SE]; S-445 01 Bohus, SE (AllExceptUS)
JOHANSSON, Hans, Erik [SE/SE]; SE (UsOnly)
LARSSON, Bo, Valdemar [SE/SE]; SE (UsOnly)
Inventors:
JOHANSSON, Hans, Erik; SE
LARSSON, Bo, Valdemar; SE
Agent:
SCHÖLD, Zaid; Nobel Industries Sweden AB Patent Department Box 11554 S-100 61 Stockholm, SE
Priority Data:
8903754-309.11.1989SE
Title (EN) SILICA SOLS, A PROCESS FOR THE PRODUCTION OF SILICA SOLS AND USE OF THE SOLS
(FR) SOLS DE SILICE, PROCEDE DE PRODUCTION DE SOLS DE SILICE ET UTILISATION DE CES SOLS
Abstract:
(EN) Silica sols which have a large alkali excess, i.e. a low molar ratio SiO2 to M2O, and which contain silica particles with a high specific surface area. The silica sols can be prepared through acidification of a water glass solution and subsequent alkalization of the acid sol to the molar ratio in question. The sols are particularly suitable for use as additives, in combination with cationic polymers, in papermaking.
(FR) L'invention se rapporte à des sols de silice qui se caractérisent par un excédent considérable en alcali, c'est-à-dire par un rapport molaire SiO2/M2O faible, et qui contiennent des particules de silice présentant une superficie spécifique élevée. Ces sols de silice peuvent préparés par acidification d'une solution de verre soluble et par alcalisation ultérieur du sol acide jusqu'à obtenir le rapport molaire en question. Ces sols sont particulièrement appropriés pour être utilisés comme additifs, en combinaison avec des polymères cationiques, dans la fabrication du papier.
Designated States: AU, CA, FI, JP, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI922057NO19921849ES2055580EP0502089US5447604CA2067495
DE000069010217KR1019920704260AU1990067342DK0502089