Abstract:
Novel reactions used to prepare phosphole and bisphosphole compounds are detailed. Novel phosphole compounds and metal coordination compounds of phosphole and bisphosphole compounds are also provided. These metal coordination compounds are useful as catalysts for the polymerization of olefins with carbon monoxide and for the polymerization of acrylic monomers.
Abstract:
A process for producing a microgel composition particles having a core of cross-linked polymer at a multiplicity of polymeric arms appended to the core, the process comprising reacting a living prepolymer component with a monomer component wherein the monomer component includes a multi-olefinic monomer.
Abstract:
Star polymers which can be used as viscosity index improvers in oil compositions formulated for high performance engines. The star polymers have tetrablock copolymer arms of hydrogenated polyisoprene-polybutadiene-polyisoprene with a block of polystyrene and which provide excellent low temperature performance in lubricating oils, exhibit good thickening efficiency, and are finishable as polymer crumb.
Abstract:
Compositions for stabilizing polynucleic acids and increasing the ability of polynucleic acids to cross cell membranes and act in the interior of a cell. In one aspect, the invention provides a polynucleotide complex between a polynucleotide and certain polyether block copolymers. The polynucleotide complex can further include a polycationic polymer, as well as suitable targeting molecules and surfactants. The invention also provides a polynucleotide complex between a polynucleotide and a block copolymer comprising a polyether block and a polycation block.
Abstract:
A compound represented by the general formula (1): FSO2CFXCF2O(CFXCF2O)nCF(CF2Y)COF, wherein X is a fluorine or chlorine atom or trifluoromethyl; Y is a fluorine, chlorine, bromine, or iodine atom; and n is 0, 1, or 2, is converted to a compound represented by the general formula (2): MOSO2CFXCF2O(CFXCF2O)nCF(CF2Y)COOM , wherein X, Y, and n are each as defined above; and M and M may be the same or different and each represents an alkali metal or alkaline earth metal atom. The compound (2) is then thermally decomposed at 150 to 250 DEG C to obtain a vinyl ethersulfonic acid derivative represented by the general formula (3): ASO2CFXCF2O(CFXCF2O)nCF=CF2, wherein X and n are each as defined above; and A is OM, OH, or fluorine. This process can provide the vinyl ethersulfonic acid derivative (3) while preventing the compound (1) from undergoing cyclization.
Abstract:
A new polymerization process (atom transfer radical polymerization, or ATRP) based on a redox reaction between a transition metal (e.g., Cu(I)/Cu(II)), provides "living" or controlled radical polymerization of styrene, (meth)acrylates, and other radically polymerizable monomers. Using various simple organic halides as model halogen atom transfer precursors (initiators) and transition metal complexes as a model halogen atom transfer promoters (catalysts), a "living" radical polymerization affords (co)polymers having the predetermined number average molecular weight by DELTA [M]/[I]o (up to Mn > 105) and a surprisingly narrow molecular weight distribution (Mw/Mn), as low as 1.15. The participation of free radical intermediates in ATRP is supported by end-group analysis and stereochemistry of the polymerization. In addition, polymers with various topologies (e.g., block, random, star, end-functional and in-chain functional copolymers [for example, of styrene and methyl (meth)acrylate]) have been synthesized using the present process. The polymeric products encompassed by the present invention can be widely used as plastics, elastomers, adhesives, emulsifiers, thermoplastic elastomers, etc.
Abstract:
A polyorganosiloxane hot melt adhesive composition includes a polyolefin - polydiorganosiloxane block copolymer, a polydiorganosiloxane, and a polyorganosilicate resin. The hot melt adhesive composition is useful in electronic device assembly processes.
Abstract:
L 'invention concerne un objet pneumatique pourvu d' une couche élastomère étanche aux gaz de gonflage, ladite couche élastomère comportant majoritairement un coupage des deux élastomères thermoplastiques suivants : a) un premier élastomère thermoplastique sous forme d'un premier copolymère à blocs qui comprend un premier bloc élastomère comportant au moins des unités issues de l'isobutylène, relié à une de ses extrémités à un premier bloc thermoplastique comprenant au moins un premier bloc constitué d'unités issues d' au moins un premier monomère polymérisable et au moins un deuxième bloc constitué d 'unités issues du β-pinène, b) un second élastomère thermoplastique sous forme d 'un second copolymère à blocs qui comprend un second bloc élastomère comportant au moins des unités issues de l'isobutylène, relié à chacune de ses deux extrémités à des seconds blocs thermoplastiques comprenant chacun au moins un premier bloc constitué d 'unités issues d' au moins un second monomère polymérisable et au moins un deuxième bloc constitué d'unités issues du β-pinène. L 'invention concerne également un procédé pour étanchéifier un objet pneumatique vis-à-vis des gaz de gonflage.