摘要:
The invention relates to a method of preparation for polymers, particularly binders for powder coatings and powder coatings which are prepared as a solution in a supercritical fluid phase. Binders for powder coatings are prepared from at least two ethylenically unsaturated monomers capable of free-radical or ionic copolymerization, and conventional initiators and regulators in supercritical fluids, whereby polymerization is carried out in the homogeneous phase, and, after the reaction has ended, either the composition or the phase parameters of the mixture are altered so that at least two phases with supercritical fluid are obtained, and the phase containing predominantly polymer is separated and the polymer is separated as a powder from the sc fluid by depressurization or the polymer phase is further processed under supercritical phase conditions to the powder coating.
摘要:
Use of OO-t-amyl-O(2-ethylhexyl)monoperoxycarbonate as a curing catalyst for bulk molding compounds (nullBMCnulls) and sheet molding compounds (nullSMCnulls) is provided.
摘要:
A radical (co)polymerization of ethylene is carried out under high pressure in the presence of at least one initiating free radical (Znull) and of at least one controlling stable free radical (SFRnull) which comprises the indoline nitroxide backbone represented by the formula (I). Mention may be made, by way of examples, of the radicals (SFRnull) of formula (II). 1 A is a hydrocarbonaceous chain forming an aromatic ring with the two carbon atoms to which it is attached, this ring being able to carry substituents or being able to carry one or more rings placed side by side, which rings are aromatic or aliphatic and optionally substituted, the carbon atoms forming the nitrogenous ring and in the alpha- and beta-position with respect to the nitrogen atom being, able to carry hydrogen atoms or substituents; R1, R2, R3 and R4, which can be identical or different, each independently represent H; alkyl; alkenyl; aryl; aralkyl; OH; nullOR5, R5nullalkyl, alkenyl, aryl or aralkyl residue; nullCOOH; nullCOOR6, R6nullalkyl, alkenyl, aryl or aralkyl residue; or CN; it being possible for R3 and R4 to merge together into nullX, X representing O or nullNR7, R7nullalkyl, alkenyl, aryl or aralkyl residue; and it being possible for the alkyl, alkenyl, aryl or aralkyl residues coming within the definition of R1 to R6 to carry substituents.
摘要:
The present invention concerns the preparation of polymers of low polydispersity and/or controlled molecular weight and architecture employing living free radical polymerization initiated by an alkoxyamine initiator or nitroxide plus, optionally, a free radical initiator, the polymer produced thereby; selected nitroxide and alkoxyamine initiators; and a process for making the initiators; the polymeric products being useful in protective coatings.
摘要:
Perfluorodiacylperoxides having the following structures: 1 wherein: when Rf is F, Rfnull, Rfnull are both nullCF3; when Rf is nullCF3, Rfnull, Rfnull are C1-C3 linear or branched perfluoro-oxyalkyl groups; said perfluorodiacylperoxides being such as to meet the following proviso: the thermal decomposition constants Kd (secnull1) in the presence of water do not undergo substantial variations with respect to the thermal decomposition constants in absence of water.
摘要:
A method of synthesizing a CO2-philic analog of a CO2-phobic compound, includes the step of: reacting the CO2-phobic compound with a CO2-philic compound selected from the group of a polyether substituted with at least one side group including preferably a Lewis base, a polycarbonate, a polycarbonate substituted with at least one side group including preferably a Lewis base, a vinyl polymer substituted with at least one side group including preferably a Lewis base a poly(ether-ester) or a poly(ether-ester) substituted with at least one side group including preferably a Lewis base, to create the CO2-philic analog. A method of synthesizing a CO2-phile includes the step of copolymerizing at least two monomers, wherein a polymer formed from homopolymerization of one of the monomers has a Tg of less than approximately 250 K and a steric factor less than approximately 1.8, at least one of the monomers contains a group that results in a pendant group from the CO2-phile backbone that contains a Lewis base group, and the resultant CO2-phile does not contain both hydrogen bond donors and acceptors.
摘要:
The invention relates to an aqueous organic peroxide emulsion comprising an anti-freeze agent, a protective colloid, and a plasticiser wherein the plasticizer is an ester having a ratio of the number of carbon atoms present in the pasticiser molecule (excluding aromatic carbon atoms) to the number of ester groups in the molecule of higher than 8. These emulsions show a reduced droplet growth as compared to emulsions comprising a conventional plasticizer, i.e. the emulsions of the invention are more stable upon storage than the emulsions of the prior art. The invention emulsions are particularly useful in polymerization processes such as the polymerization of vinyl chloride monomer.
摘要:
Disclosed are (1) a thermopolymerizable composition containing a thermopolymerizable compound containing a (meth)acrylate having a moiety including oxyalkylene, fluorocarbon, oxyfluorocarbon and/or carbonate in the molecule, at least one electrolyte, and a polymerization initiator which is an organic peroxide containing no benzene ring, (2) a solid electrolyte obtained by thermally curing the composition, and (3) a primary battery, a secondary battery and electric double layer capacitor including the solid electrolyte, as well as a production method thereof. The polymer solid electrolyte obtained from the thermopolymerizable composition has high ion conductivity and good stability and the primary battery and secondary battery produced using the polymer solid electrolyte are operable at high capacity and high current, has a long-term service life and high reliability, and can be produced at low costs. Further the electric double layer capacitor is high in output voltage, and outputs a large amount of current, has high working ability, has a long-term service life and high reliability, and can be produced at low costs.
摘要:
A process for producing organic peroxide initiators useful in the polymerization of ethylenically unsaturated monomers. The process for making the organic peroxides includes forming an aqueous emulsion of the organic peroxide. The organic peroxide is dispersed as small droplets of from 1 to 10 microns in size in the aqueous emulsion. The organic peroxide may be added to a polymerization reactor containing an ethylenically unsaturated monomer. The organic peroxide functions as a free radical initiator to polymerize the monomer. The organic peroxide may be substantially free of organic solvents and plasticizers. The resulting polymers are of high quality.
摘要:
The invention relates to peroxide compositions that are phlegmatised with a specific unsaturated phlegmatising agent. The phlegmatised peroxide compositions are optionally stabilised. In addition, the invention relates to the safe handling of these peroxide compositions and the use of these peroxide compositions in polymerisation processes.