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    Shortstopping free radical polymerization of vinylidene monomers
    1.
    发明授权
    Shortstopping free radical polymerization of vinylidene monomers 失效
    缩短乙烯基单体的自由基聚合

    公开(公告)号：US3637632A

    公开(公告)日：1972-01-25

    申请号：US3637632D

    申请日：1970-06-01

    申请人： GOODRICH CO B F

    发明人： TRAYNOR LEE

    IPC分类号： C08F2/42 ,  C08F1/82 ,  C08F3/30

    CPC分类号： C08F2/42

    摘要： THE FREE RADICAL POLYMERIZATION OF VINYLIDENE MONOMERS IS EFFECTIVELY TERMINATED BY ADDING TO A POLYMERIZATION MIXTURE THIOSEMICARBAZIDE OR THIOSEMICARBAZONE DERIVATIVES THEREOF. THESE SHORT-STOPS ARE PARTICULARLY EFFECTIVE IN THE POLYMERIZATION OF VINYL HALIDES WITH ORGANIC PEROXY CATALYST AND RESULT IN STABLE UNIFORM POLYMERS.

    Ethylene polymerization process
    2.
    发明授权
    Ethylene polymerization process 失效
    乙烯聚合方法

    公开(公告)号：US3842060A

    公开(公告)日：1974-10-15

    申请号：US38830673

    申请日：1973-08-14

    申请人： DART IND INC

    发明人： MCDONALD G ,  DOUGLAS R ,  LEIBSON I

    IPC分类号： C08F2/00 ,  C08F2/34 ,  C08F2/38 ,  C08F10/00 ,  C08F1/60 ,  C08F1/82 ,  C08F3/04

    CPC分类号： C08F10/00 ,  C08F4/28

    摘要： 1. IN A PROCESS FOR THE CONTINUOUS POLYMERIZATION OF MONOMER COMPRISING ETHYLENE IN THE PRESENCE OF A FREE RADICAL INITIATOR EMPLOYING A REACTION SYSTEM COMPRISING AN INDIRECTLY COOLED TUBULAR REACTOR WHEREIN MONOMER IS INTRODUCED AT LEAST TO THE INLET OF THE REACTOR AND FRESH MONOMER MAKE-UP GAS IS PROVIDED TO THE REACTION SYSTEM, THE POLYMER PRODUCT IS SEPARATED FROM UNREACTED MONOMER AND UNREACTED MONOMER IS RECYCLED TO THE EACTOR, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY ADDING HYDROGEN TO THE REACTOR IN AMOUNTS CORRESPONDING TO BETWEEN 10 AND 150 P.P.M. BY VOLUME OF THE FRESH MONOMER MAKE-UP GAS TO THE REACTION SYSTEM.

    Continuous process for production of fluoroelastomers
    3.
    发明授权
    Continuous process for production of fluoroelastomers 失效
    连续生产氟橡胶的方法

    公开(公告)号：US3845024A

    公开(公告)日：1974-10-29

    申请号：US30885572

    申请日：1972-11-22

    申请人： DU PONT

    发明人： WEAVER S

    IPC分类号： C08F14/00 ,  C08F2/04 ,  C08F14/22 ,  C08F214/22 ,  C08F1/82

    CPC分类号： C08F214/22

    摘要： 1. THE PROCESS FOR THE CONTINUOUS COPOLYMERIZATION OF VINYLIDENE FLUORIDE WITH AT LEAST ONE OTHER POLYMERIZABLE, UNSATURATED FLUORINATED MONOMER IN AQUEOUS EMULSION TO A POLYMERIC PRODUCT HAVING BOARD MOLECULAR WEIGHT DISTRIBUTION, SAID PROCESS COMPRISING THE FOLLOWING STESP: (1) INTRODUCING THE MONOMERS, WATER AND A WATERSOLUBLE FREE RADICAL GENERATOR AT A CONCENTRATION OF ABOUT 0.001-2 WEIGHT PERCENT BASED ON THE TOTAL MONOMERS, BUT NO CHAIN TRANSFER AGENT, INTO THE FIRST OF TWO REACTORS EQUIPPED WITH AGITATING MEANS AND MAINTAINED AT A TEMPERATURE OF ABOUT 50-130* C., AND A PRESSURE F ABOUT 250-1,500 P.S.I.G. AT SUCH A FLOW RATE THAT THE RESIDENCE TIME IS SUFFICIENT TO FORM A POPOLYMER HAVING AN INHERENT VISCOSITY OF APPROXMATELY 1.5-3.0; (2) WITHDRAWING THE PRODUCT STREAM FROM THE FIRST REACTOR AT THE SAME RATE AS THE FEED RATE OF MATERIALS INTO SAID REACTOR AND IMMEDIATELY INTRODUCING SAID PRODUTC INTO THE SECOND OF THE TWO REACTORS EQUIPPED WITH AGITATING MEANS AND MAINTAINED AT A TEMPERATURE OF ABOUT 50-130* C. AND A PRESSURE OF ABOUT 250-1,500 P.S.I.G.; (3) INTRODUCING THE SAID SECOND REACTOR AN ADDITIONAL QUANTITY OF FLUORINATED MONOMERS AND CHAIN TRANSFER AGENT, THE PROPORTION OF SAID CHAIN TRANSFER AGENT BEING ABOUT 1-6 MOLES PER MOLE OF FREE RADICAL GENETATOR, AND THE RESIDENCE TIME IN SAID SECOND REACTOR BEING SUFFICIENT TO PRODUCE A COPOLYMER HAVING AN INHETENT VISCOSITY OF APPROXIMATELY 0.1-0.8; AND (4) CONTINUOUSLY WITHDRAWING THE PRODUCT EMULSION FROM THE SECOND REACTOR AND SEPARATING THE POLYMERIC PRODUCT THEREFROM; WITH THE PROVISO THAT THE INHERENT VISCOSITY OF EACH COPOLYMER IS MEASURED AT A CONCENTRATION OF 0.1 G. OF COPOLYMER IN 100 ML. OF A MIXTURE OF 86.1 WEIGHT PERCENT OF TETRAHYDROFURAN AND 13.9 WEIGHT PERCENT OF DIMETHYLFORMAMIDE AT 30* C.

    Controlling polymerization of comonomer in copolymerization
    4.
    发明授权
    Controlling polymerization of comonomer in copolymerization 失效
    控制共聚物中共聚物的聚合

    公开(公告)号：US3658777A

    公开(公告)日：1972-04-25

    申请号：US3658777D

    申请日：1969-09-12

    申请人： PHILLIPS PETROLEUM CO

    发明人： GREEN WILLIAM B

    IPC分类号： C08F10/00 ,  C08F1/66 ,  C08F1/82 ,  C08F15/04

    CPC分类号： C08F10/00 ,  C08F4/22

    摘要： THE POLYMERIZATION OF COMONOMER IN A COPOLYMERIZATION AS IN THE COPOLYMERIZATION OF ETHYLENE AND BUTENE-1 IS CONTROLLED BY INCREASING THE METAL ALKYL IN THE REACTION ZONE. IN ONE EMBODIMENT THE CHANGEOVER TIME IN A PLANT WHEN DESIRING TO PRODUCE A HOMOPOLYMER OF A 1-OLEFIN WITHOUT PLANT SHUTDOWN WHEN IT HAS BEEN PRODUCING A 1OLEFIN-OLEFIN COMONOMER COPOLYMER IS REDUCED BY ADDING TO THE INFLUENT TO THE REACTION ZONE, ABOUT WHEN THE COMONOMER FLOW HAS BEEN DISCONTINUED, A METAL ALKYL WHICH INHIBITS THE COPOLYMERIZATION OF THE COMONOMER WITH THE 1-OLEFIN. IN AN EMBODIMENT THE CHANGEOVER IS FROM ETHYLENE-1-BUTENE COPOLYMERIZATION TO EHTYLENE HOMOPOLYMERIZATION AND THE CATALYST IS A CHROMINUM OXIDE IN WHICH AT LEAST PART OF THE CHROMIUM IS IN THE HEXAVALENT STATE AND IS SUPPORTED ON AT LEAST ONE MATERIAL TAKEN FROM SILICA, ALUMINA, ZIRCONIA AND THORIA AND THE METAL ALKYL IS DIETHYL ZINC ALONE OR TOGETHER WITH TRIETHYL BORANE. THE AMOUNT OF THE ADDITIVE OR ADDITIVE MIXTURE IS DETERMINED TO INHIBIT SUBSTANTIALLY THE COPOLYMERIZATION OF THE COMONOMER UNTIL THE AMOUNT OF IT IN THE REACTOR HAS BEEN REDUCED TO AN EXTENT SUFFICIENT TO PERMIT SUBSTANTIALLY SPECIFICATION HOMOPOLYMER TO BE PRODUCED. THE USUAL RATES WHEN ADDING DIETHYL ZINC TO INCREASE THE SHEAR RESPONSE OF THE POLYMER BEING MADE ARE UP TO ABOUT ONE-THREE POUNDS PER HUNDRED POUNDS OF THE CATALYST. THE AMOUNT ACCORDING TO THE INVENTION EXCEEDS APPRECIABLY THIS AMOUNT AND USUALLY IS IN THE APPROXIMATE RANGE FIVE-TEN POUNDS PER HUNDRED POUNDS OF CATALYST. THE INVENTION PERMITS A CONTROL OF THE PROPORTION OF COMONOMER ENTERING INTO THE COPOLYMER BEING FORMED INDEPENDENTLY OF ADJUSTMENT OF THE PORTION OF THE COMONOMER IN THE FEED TO THE REACTOR.

    Method and apparatus for interrupting the polymerization of olefins
    8.
    发明授权
    Method and apparatus for interrupting the polymerization of olefins 失效
    用于中断烯烃聚合的方法和装置

    公开(公告)号：US3708465A

    公开(公告)日：1973-01-02

    申请号：US3708465D

    申请日：1971-01-12

    申请人： HUELS CHEMISCHE WERKE AG

    发明人： DIETRICH J ,  WOLFF O ,  AMREHN H ,  BECKMANN G

    IPC分类号： C08F2/00 ,  C08F2/38 ,  C08F6/00 ,  C08F6/06 ,  C08F10/00 ,  C08F1/82 ,  C08F3/00

    CPC分类号： C08F10/00 ,  Y10S526/918 ,  C08F2/42

    摘要： AN APPARATUS AND METHOD FOR INTERRUPTING THE POLYMERIZATION OF ETHYLENE, PROPYLENE, OR 1-BUTENE HAVING A POLYMERIZATION CATALYST COMPRISING A MIXTURE OF AN ALUMINUM-ORGANIC COMPOUND WITH A SALT, FRESHLY PRECIPITATED OXIDE OR HYDROXIDE OF METALS OF GROUPS IV-B, V-B OR VI-B OF THE PERIODIC SYSTEM, INCLUDING THORIUM AND URANIUM WHICH COMPRISES ADDING TO A SUSPENSION OF THE OLEFIN AND CATALYST ABOUT 15 TO 100 MOLE PERCENT OF A DEACTIVATOR COMPRISING AN ORGANIC COMPOUND WHICH CONTAINS OXYGEN, AN ORGANIC COMPOUND WHICH CONTAINS OXYGEN AND HYDROGEN, A ORGANIC COMPOUND WHICH CONTAINS HYDROGEN, HYDROGEN HALIDE OR WATER, RELATIVE TO THE ALKYL GROUP AND/OR HYDRIDE GROUP BONDED TO THE ALUMINUM OF THE ALUMINUM-ORGANIC COMPOUND.