公开(公告)号：US3658772A

公开(公告)日：1972-04-25

申请号：US3658772D

申请日：1970-02-02

申请人： DOW CHEMICAL CO

发明人： VOLK HENRY ,  HAMLIN PERCY J

IPC分类号： C08F20/56 ,  C08F220/06 ,  C08F1/08 ,  C08F15/02 ,  C08F15/40

CPC分类号： C08F220/06 ,  C08F20/56

摘要： WATER-SOLUBLE COPOLYMERS OF 30 TO 95 PERCENT BY WEIGHT OF ACRYLIC ACID WITH FROM 70 TO 5 PERCENT WEIGHT OF ACRYLAMIDE WITH OR WITHOUT ADDITIONAL DILUENT COMONOMERS ARE PREPARED IN THE FORM OF FLUID, POURABLE, AQUEOUS, SUSPENSIONS OF POLYMER SOLIDS BY CARRYING OUT THE POLYMERIZATION AT A TEMPERATURE OF FROM JUST ABOVE THE FREEZING POINT OF THE REACTION MIXTURE OF ABOUT 60*C. IN A SOLUTION OF THE MONOMERS IN AN AQUEOUS INORGANIC SALT SOLUTION AT A PH OF FROM ABOUT 1 TO ABOUT 3.2 WITH AGITATION SUFFICIENT TO MAINTAIN PRECIPITATED COPOLYMER IN SUSPENSION. SAID SALT SOLUTION CONTAINS A PREDETERMINED CONCENTRATION OF ALKALI METAL OR AMMONIUM SALT OF STRONG INORGANIC ACID IN THE RANGE OF FROM ABOUT 0.1 PERCENT TO 10 PERCENT BY WEIGHT OF THE REACTION MIXTURE, THE CONCENTRATION OF SALT BEING ADJUSTED TO PRECIPITATE HIGH MOLECULAR WEIGHT COPOLYMER OF THE COMPOSITION EMPLOYED UNDER THE PARTICULAR REACTION CONDITIONS OF A SPECIFIC POLYMERIZATION. THE COPOLYMERS SO PREPARED CAN BE READILY DISSOLVED IN WATER, ARE OF HIGH MOLECULAR WEIGHT AND ARE PARTICULARLY USEFUL AS FLOCCULANTS TO IMPROVE THE RATE OF RAW SEWAGE SOLIDS AND OF A VARIETY OF MINERAL SOLIDS.

公开(公告)号：US3446681A

公开(公告)日：1969-05-27

申请号：US3446681D

申请日：1968-04-18

申请人： DOW CHEMICAL CO

发明人： SLYKHOUSE THOMAS E ,  WERTH KENNETH E ,  VOLK HENRY

IPC分类号： C06B47/14 ,  C06B1/04 ,  C06B15/00

CPC分类号： C06B47/14 ,  Y10S149/114

公开(公告)号：US3658771A

公开(公告)日：1972-04-25

申请号：US3658771D

申请日：1969-01-14

申请人： DOW CHEMICAL CO

发明人： VOLK HENRY ,  HAMLIN PERCY JAY

IPC分类号： B01D21/01 ,  C02F1/54 ,  C08F2/00 ,  C08F2/04 ,  C08F2/10 ,  C08F2/44 ,  C08F2/46 ,  C08F4/00 ,  C08F4/40 ,  C08F20/00 ,  C08F20/06 ,  C08F20/62 ,  C08F120/04 ,  C08F120/06 ,  C02B1/20 ,  C08D1/04 ,  C08F3/46

CPC分类号： C08F120/06 ,  C02F1/54 ,  C08F20/06 ,  C08F20/62 ,  Y10S526/915 ,  Y10S526/923

摘要： POLYACRYLATES ARE PREPARED IN AQUEOUS SOLUTION UNDER SPECIALLY CONTROLLED REACTION CONDITIONS TO PRODUCE EFFICIENT FLOCCULANTS. AMMONIUM ACRYLATE TO POLYMERIZED AT A MONOMER CONCENTRATION WITHIN THE RANGE FROM ABOUT 10 WEIGHT PERCENT OF THE POLYMERIZATION SYSTEM UP TO THE MONOMER SATURATION LEVEL, IN THE PRESENCE OF AT LEAST 0.1 WEIGHT PERCENT OF AMMONIUM HYDROXIDE. THE UPPER LIMIT ON THE AMOUNT OF HYDROXIDE EMPLOYED WILL RANGE DOWNWARDLY FROM ABOUT 15 WEIGHT PERCENT TO APPROXIMATELY 5 WEIGHT PERCENT FOR MONOMER CONCENTRATIONS FROM 10 TO 40 WEIGHT PERCENT RESPECTIVELY. FURTHER IMPROVEMENT IN POLYMER PROPERTIES IS ACHIEVED BY THE INCORPORATION OF AT LEAST ABOUT 1 WEIGHT PERCENT, BASED ON THE WEIGHT OF POLYMERIZATION SYSTEM, OF AN ALKALI METAL SALT.

公开(公告)号：US3657378A

公开(公告)日：1972-04-18

申请号：US3657378D

申请日：1969-01-14

申请人： DOW CHEMICAL CO

发明人： VOLK HENRY ,  HAMLIN PERCY JAY

IPC分类号： B01D21/01 ,  C02F1/54 ,  C08F2/00 ,  C08F2/04 ,  C08F2/10 ,  C08F2/44 ,  C08F2/46 ,  C08F4/00 ,  C08F4/40 ,  C08F20/00 ,  C08F20/06 ,  C08F20/62 ,  C08F120/04 ,  C08F120/06 ,  C08F3/44 ,  C08F15/00 ,  C08F15/36

CPC分类号： C08F120/06 ,  C02F1/54 ,  C08F20/06 ,  C08F20/62 ,  Y10S526/915 ,  Y10S526/923

摘要： POLYACRYLATES ARE PREPARED IN AQUEOUS SOLUTION UNDER SPECIALLY CONTROLLED REACTION CONDITIONS TO PRODUCE EFFICIENT FLOCCULANTS. ALKALI METAL ACRYLATE IS POLYMERIZED AT A MONOMER CONCENTRATION WITHIN THE RANGE FROM ABOUT 10 WEIGHT PERCENT OF THE POLYMERIZATION SYSTEM UP TO THE MONOMER SATURATION LEVEL. THE MONOMER SOLUTION IS ADJUSTED TO A PH OF AT LEAST ABOUT 10.7 TY THE ADDITION OF AN ALKALI METAL HYDROXIDE. THE UPPER LIMIT ON THE AMOUNT OF HYDROXIDE THAT CAN BE EMPLOYED WILL RANGE DOWNWARDLY FROM ABOUT 15 WEIGHT PERCENT OF THE POLYMERIZATION SYSTEM TO LESS THAN 1 PERCENT FOR MONOMER CONCENTRATIONS

FROM 10 WEIGHT PERCENT UP TO THE MONOMER STURATION LEVEL. FURTHER IMPROVEMENT IN POLYMER PROPERTIES IS ACHIEVED BY THE INCORPORATION OF AT LEAST ABOUT 1 WEIGHT PERCENT, BASED ON THE WEIGHT OF POLYMERIZATION SYSTEM, OF AN ALKALI METAL SALT.

公开(公告)号：US3493500A

公开(公告)日：1970-02-03

申请号：US3493500D

申请日：1966-10-20

申请人： DOW CHEMICAL CO

发明人： VOLK HENRY ,  HAMLIN PERCY JAY

IPC分类号： C08F20/56 ,  C08F220/06 ,  C08K3/00 ,  C08L33/02 ,  C08L33/26 ,  C08D1/04 ,  C02B1/20

CPC分类号： C08L33/26 ,  C08F20/56 ,  C08F220/06 ,  C08K3/105 ,  C08L33/02 ,  Y10S526/91 ,  C08L2666/04