公开(公告)号：CA2082826A1

公开(公告)日：1991-11-22

申请号：CA2082826

申请日：1991-04-24

Applicant: ISP INVESTMENTS INC

Inventor： TAZI MOHAMMED ,  ARDAN JOHN J

IPC: C08F2/00 ,  C08F2/02 ,  C08F2/38 ,  C08F6/00 ,  C08F6/06 ,  C08F16/16 ,  C08F20/02 ,  C08F216/18 ,  C08F222/06 ,  C08F2/06 ,  C08F216/12

Abstract: 2082826 9118024 PCTABS00008 What is described herein is a process for making copolymers of maleic anhydride and C1-C4 alkyl vinyl ethers of predetermined specific viscosities extending over a wide viscosity range. The invention is characterized by (a) precharging a reactor with a C1-C4 alkyl vinyl ether as solvent and a polymerization initiator at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C1-C4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of alkyl ether, and at a selected rate, into said precharged reactor, (c) polymerizing said reactants to form a slurry of said copolymer in said excess alkyl vinyl ether solvent, and (d) introducing toluene into said reactor during the polymerization to control the specific viscosity of the copolymer product being produced.

公开(公告)号：CA2083951A1

公开(公告)日：1992-02-10

申请号：CA2083951

申请日：1991-07-11

Applicant: ISP INVESTMENTS INC

Inventor： TAZI MOHAMMED ,  ARDAN JOHN J ,  COHEN JEFFREY M ,  ZAMORA JOHN N

IPC: C08F16/16 ,  C08F20/02 ,  C08F216/18 ,  C08F222/06 ,  C08L29/10

Abstract: 2083951 9202564 PCTABS00010 What is described herein is a process for making a copolymer of high specific viscosity by polymerisation of maleic anhydride and a C1-C4 alkyl vinyl ether monomer. The invention involves polymerizing said monomers to form a slurry of said copolymer in excess alkyl vinyl ether as solvent and toluene or an aliphatic organic compound as cosolvent, and is characterized by the steps of: (a) precharging a reactor with C1-C4 alkyl vinyl ether as solvent at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C1-C4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of the alkyl vinyl ether, and at a selected rate, into said precharged reactor, and (c) simultaneously feeding a predetermined mixture of toluene or an aliphatic organic compound and a polymerization initiator continuously over substantially the entire period of polymerization.

公开(公告)号：AU648318B2

公开(公告)日：1994-04-21

申请号：AU7878791

申请日：1991-04-24

Applicant: ISP INVESTMENTS INC

Inventor： TAZI MOHAMMED ,  ARDAN JOHN J

IPC: C08F2/00 ,  C08F2/02 ,  C08F2/38 ,  C08F6/00 ,  C08F6/06 ,  C08F16/16 ,  C08F20/02 ,  C08F216/18 ,  C08F222/06 ,  C08F216/12 ,  C08F6/24 ,  C08F2/06

Abstract: What is described herein is a process for making copolymers of maleic anhydride and C1-C4 alkyl vinyl ethers of predetermined specific viscosities extending over a wide viscosity range. The invention is characterized by (a) precharging a reactor with a C1-C4 alkyl vinyl ether as solvent and a polymerization initiator at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C1-C4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of alkyl ether, and at a selected rate, into said precharged reactor, (c) polymerizing said reactants to form a slurry of said copolymer in said escess alkyl vinyl ether solvent, and (d) introducing toluene into said reactor during the polymerization to control the specific viscosity of the copolymer product being produced.