公开(公告)号：US3686010A

公开(公告)日：1972-08-22

申请号：US3686010D

申请日：1970-12-30

申请人： DOW UNQUINESA SA

发明人： SOLOMKA MONROE M ,  MONTOYA JOSE M GENUA

IPC分类号： C09C1/36

CPC分类号： C09C1/36 ,  C01P2004/84 ,  C01P2006/40

摘要： A TITANIUM DIOXIDE PIGMENT HAVING HIGH SPECIFIC RESISTANCE IS PREAPARED BY FORMING A SLURRY OF THE PIGMENT HAVING A SOLIDS CONTENTS OF ABOUT 10-30% BY WEIGHT IN DE IONIZED OR DISTILLED WATER, HEATING THE SLURRY BETWEEN ABOUT 50*C. AND ITS BOILING POINT, FOR LAT LEAST 15 MINUTES, AND DEWATERING AND DRYING THE PIGMENT.

公开(公告)号：US3695907A

公开(公告)日：1972-10-03

申请号：US3695907D

申请日：1970-11-19

申请人： DOW UNQUINESA SA

发明人： SOLOMKA MONROE M ,  FERNANDEZ GABRIEL PUENTE

IPC分类号： C09C1/36

CPC分类号： C09C1/3653 ,  C01P2006/60

摘要： TITANIUM DIOXIDE PIGMENTS OF IMPROVED RESISTANCE TO PHOTO-REDUCTION ARE PRODUCED BY INCORPORATING WITH THE PIGMENT AT LEAST ABOUT 0.05% BY WEIGHT OF A METAL HALATE OR PERHALATE.

公开(公告)号：US3706829A

公开(公告)日：1972-12-19

申请号：US3706829D

申请日：1970-11-19

申请人： DOW UNQUINESA SA

发明人： SOLOMKA MONROE M ,  AGUIRRE ENRIQUE RENTERIA

IPC分类号： C01G23/053 ,  C01G23/06

CPC分类号： C01G23/0534 ,  C01P2006/60 ,  Y10T436/12

摘要： THE HYDROLYSIS OF TITANIUM SULFATE SOLUTIONS IS PERFORMED AND CONTROLLED BY HEATING A SEEDED TITANIUM SULFATE SOLUTION WITH AGITATION WHILE SIMULTANEOUSLY MEASURING THE REFLECTANCE OF THE RESULTING SUSPENSION, UNTIL A CRITICAL POINT IS ATTAINED AS INDICATED BY A SUBSTANTIAL CHANGE IN THE RATE OF REFLECTANCE PER UNIT OF HYDROLYSIS TIME, ALLOWING THE SOLUTION TO REMIAN QUIESCENT FOR FROM 5 TO 60 MINUTES, THEN RESUMING THE HEATING OF THE SOLUTION UNTIL THE HYDROLYSIS PRODUCES THE DESIRED YIELD OF TITANIUM HYDRATE. THE MEASUREMENT OF REFLECTANCE MAY BE

MADE BY PHOTOELECTRIC MEANS, AND THE POINT OF INFLECTION OF THE REFLECTANCE CURVE OR ITS FIRST OR SECOND DERIVATIVE WITH RESPECT TO TIME MAY BE USED TO CONTROL THE HYDROLYSIS PROCESS.