EP 1068031 A4 20020731 - TREATING PARTICULATE ALKALINE EARTH METAL CARBONATES
Title (en)
TREATING PARTICULATE ALKALINE EARTH METAL CARBONATES
Title (de)
BEHANDLUNG VON ERDALKALIMETALLKARBONATPARTIKELN
Title (fr)
TRAITEMENT DES PARTICULES DES CARBONATES DE METAUX ALCALINO-TERREUX
Publication
Application
Priority
- US 9825332 W 19981125
- US 6743197 P 19971203
Abstract (en)
[origin: WO9928050A1] A method of treating a particulate material comprising particles of an alkaline earth metal carbonate includes the step of exposing the particulate material to a treatment atmosphere containing a surface treatment agent comprising one or more fatty acids which reacts with and coats the particles of the particulate material, wherein the treatment atmosphere is substantially water free and maintained at a temperature which is above the melting point of the surface treatment agent and at least 120 DEG C, preferably 125 DEG C or more, and wherein in the treatment atmosphere the concentration of the surface treatment agent and the residence time of the particulate material are such as to provide a chemisorbed coating of the surface treatment agent on at least 75 %, preferably at least 90 %, of the surface area of the particulate material and the amount of physisorbed or unreacted surface treatment agent contained on the particulate material immediately after leaving the treatment atmosphere is not greater than about 0.5 %, preferably 0.4 % or less, by weight based upon the dry weight of the particulate material.
IPC 1-7
IPC 8 full level
CPC (source: EP)
B01J 2/006 (2013.01); C09C 1/02 (2013.01); C09C 1/021 (2013.01); C01P 2002/88 (2013.01); C01P 2004/32 (2013.01); C01P 2004/50 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/84 (2013.01); C01P 2006/12 (2013.01); C01P 2006/80 (2013.01); C01P 2006/90 (2013.01)
Citation (search report)
- [X] WO 9517441 A1 19950629 - ECC INT INC [US]
- [X] GB 728698 A 19550427 - BLANC OMYA SA DU
- [X] GB 1023187 A 19660323 - OMYA SA
- See references of WO 9928050A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9928050 A1 19990610; AR 013785 A1 20010110; AU 1611399 A 19990616; EP 1068031 A1 20010117; EP 1068031 A4 20020731; TR 200002245 T2 20010723
DOCDB simple family (application)
US 9825332 W 19981125; AR P980106142 A 19981203; AU 1611399 A 19981125; EP 98960534 A 19981125; TR 200002245 T 19981125