Abstract: The invention concerns a method for preparation of a liquid polymer composition, where ethylenically unsaturated monomers are polymerized by means of initiators that have a transferable atomic group, and one or more catalysts that contain at least one transition metal, in the presence of ligands that can form a coordination compound with the metallic catalysts, the catalyst is oxidized after the polymerization and then the catalyst is separated by filtration, where the composition contains a solvent with a dielectric constant less than or equal to 4.
Type:
Grant
Filed:
November 30, 1999
Date of Patent:
February 19, 2002
Assignee:
RohMax Additives GmbH
Inventors:
Sebastian Roos, Boris Eisenberg, Michael Mueller
Abstract: A novel loop/slurry olefin polymerization process is provided which produces ultra high molecular weight ethylene homopolymers and ultra high molecular weight ethylene copolymers. Catalyst systems used are selected from the group consisting of inorganic oxide supported titanium-containing catalyst systems, inorganic oxide supported organo-zirconium catalyst systems and inorganic oxide supported organo-hafnium catalyst systems.
Type:
Grant
Filed:
October 14, 1997
Date of Patent:
December 11, 2001
Assignee:
Phillips Petroleum Company
Inventors:
Joel L. Martin, Joseph J. Bergmeister, Eric T. Hsieh, Max P. McDaniel, Elizabeth A. Benham, Steven J. Secora
Abstract: A polyimide resin composition comprising a polyimide resin (A) and at least one 1H-tetrazole (B) selected from the group consisting of 1H-tetrazole, 5,5′-bis-1H-tetrazole, and derivatives thereof, and having an excellent rust preventing effect on copper and copper alloys.
Abstract: Process for the synthesis of block polymers, homopolymers and copolymers of narrow polydispersity having formula (1) by contacting selected vinyl monomer(s), vinyl-terminated compound(s) and free radicals in which effective control of production of polymer is achieved by controlling the mole ratio of vinyl monomer(s), vinyl-terminated compound(s) and free radicals relative to one another; and polymers produced thereby
Type:
Grant
Filed:
November 20, 1997
Date of Patent:
September 18, 2001
Assignees:
E. I. du Pont de Nemours and Company, Commonwealth Scientific Industrial Research
Organization
Inventors:
Graeme Moad, Catherine Louise Moad, Julia Krstina, Ezio Rizzardo, Thomas Robert Darling, Charles Thomas Berge
Abstract: Solvent-free, free-flowing, fine white powders of a copolymer of maleic anhydride and a C1-C4 alkyl vinyl ether having a specific viscosity of about 0.5 to about 5 (1% wt/v in methyl ethyl ketone, 25° C.) and substantially without residue, odor or taste. A solvent-free process of polymerizing the monomers in the presence of 0.01 to 1.9% acetaldehyde also is described.
Abstract: Blocky chlorinated polyolefins are disclosed as compatibilizers of PVC and/or CPVC resins with polyolefin elastomers. The blocky chlorinated polyolefins facilitate the dispersion of the elastomers as a dispersed phase with the proper size for impact modification of the PVC and/or CPVC. The blocky chlorinated polyolefin provides better adhesion between the elastomer and the PVC and/or CPVC providing better physical properties such as impact strength as measured by Notched Izod and variable height impact testing (VHIT) than did the randomly chlorinated polyolefins, often used as processing aids and as impact modifiers in PVC or CPVC. The differences in properties achieved with blocky chlorinated polyolefins versus randomly chlorinated polyolefins are attributed to the individual blocks of the blocky polyolefin being compatible (and/or co-crystalizable) with either the polyolefin elastomer or the PVC/CPVC resulting in better adhesion between phases.
Type:
Grant
Filed:
March 31, 1998
Date of Patent:
September 26, 2000
Assignee:
The B. F. Goodrich Company
Inventors:
Bernard Frank Cinadr, Carole Angele Lepilleur, Arthur Leonard Backman, Robert Edwin Detterman, Theodore Joseph Schmitz
Abstract: The invention describes crosslinkable compositions comprising(1) organosilicon compounds which contain radicals having aliphatic carbon-carbon multiple bonds,(2) organosilicon compounds having Si-bonded hydrogen atoms or, in place of or in addition to (1) and (2); said composition further comprising(3) organosilicon compounds which contain radicals having aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms,(4) catalysts which promote the addition of Si-bonded hydrogen to aliphatic multiple bonds, and ##STR1## where R.sup.1 and R.sup.2 are as defined in claim 1, and X is a radical of the formula --OH, --Cl, --Br and --CN, with the radical --OH being particularly preferred.
Type:
Grant
Filed:
June 2, 1998
Date of Patent:
August 8, 2000
Assignee:
Wacker-Chemie GmbH
Inventors:
Jochen Dauth, Bernward Deubzer, Josef Wolferseder, Klaus Schnitzer