摘要:
Decene oligomers useful with or without hydrogenation as basis for synthetic lubricating oils are prepared by oligomerizing decene-1 in the presence of an alkylaluminum chloride catalyst and an alkyl halide cocatalyst, in a first reaction stage the decene-1 being mixed with the catalyst at from 0 to +25.degree. C. and being kept in contact therewith within the same temperature range for not less than 15 minutes and in a second reaction stage the cocatalyst being added at from 0 to +35.degree. C. in the course of a period of from 15 to 180 minutes.
摘要:
A copolymer with stellate branching, of the general formula [A-].sub.k X, where A is the monovalent radical of a homopolymer, block copolymer or random copolymer of a conjugated diene and/or vinyl-aromatic hydrocarbon, k is a number from 1 to 10, and X is the k-valent radical of a coupling center produced by coupling with hexatriene, and the product of the hydrogenation thereof are described.
摘要:
Olefinically unsaturated hydrocarbons, in particular dimeric or polymeric isobutene derivatives, which have a mean number average molecular weight M.sub.n of from 100 to 3000, are reacted with maleic anhydride in a molar ratio of maleic anhydride to olefin of from 0.2 to 3.0, in the presence of from 1 to 5000 ppm by weight of an alkoxide of titanium, of zirconium, of vanadium or of aluminum, at from 150.degree. to 280.degree. C., with formation of the corresponding succinic anhydride. These products are used for the preparation of anticorrosive agents or oil additives.
摘要:
The processing properties of isobutene polymers when reacted with maleic anhydride are improved by a method in which these polymers are brought into contact, for an effective period,with aluminum oxide and/or a completely or partially hydrated aluminum oxide at 50.degree.-280.degree. C., and/orwith boron oxide and/or a completely or partially hydrated boron oxide and/or with titanium dioxide and/or a partially hydrated titanium dioxide and/or with a completely or partially hydrated silicon dioxide at 0.degree.-280.degree. C.
摘要:
Isobutylene polymers are prepared by polymerizing the monomers at from 0.2 to 20 bar and from -130.degree. and +60.degree. C. in the presence of from 0.01 to 20 mmol of a boron halide catalyst system which contains as cocatalyst a carboxylic anhydride or carbonyl halide, preferably an aliphatic or aromatic, unsubstituted or halogen-substituted C.sub.4 -C.sub.18 -carboxylic anhydride of C.sub.2 -C.sub.12 -carbonyl halide and where appropriate also a customary polymerization accelerant in customary amounts, in the presence or absence of an inert solvent with dissipation of the heat of reaction.
摘要:
A transparent thermoplastic molding material contains, based on A+B,A: from 5 to 95% by weight of polystyrene andB; from 95 to 5% by weight of a nonelastomeric star block copolymer which is composed of, based on B, b.sub.1 from 60 to 95% by weight of styrene and b.sub.2 from 5 to 40% by weight of one or more conjugated dienes of 4 or 5 carbon atoms and is prepared in a conventional manner by sequential anionic polymerization using one or more organolithium compounds as an initiator and in the presence of a solvent with subsequent coupling.In this process, component A is produced by conventional anionic polymerization using one or more organolithium compounds in the presence of an organic solvent.The molding material is prepared by mixing the components A and B, with or without C, in a conventional manner and is used for the production of moldings.
摘要:
Homo- or copolymers which have terminal mercapto groups, are composed of one or more monomers from the group consisting of butadiene, isoprene and styrene and are obtained by anionic polymerization of one or more of the stated monomers in the presence of one or more organolithium compounds followed by reaction (of the living anions) with an episulfide of the general formula I ##STR1## where R is hydrogen, alkyl of 1 to 18 carbon atoms or aryl of 6 to 10 carbon atoms, with the formation of one or more primary or secondary mercapto groups at the end of the polymer chain(s) are prepared by a process in which a thiolcarboxylic acid of the general formula II ##STR2## where R.sup.1 is hydrogen, alkyl of 1 to 10 carbon atoms or --CH.sub.2 --COOH and R.sup.2 is 0 or from 1 to 10 CH.sub.2 units, is added directly to the resulting reaction mixture in an amount of from 0.5 to 2 moles of the thiolcarboxylic acid per mole of episulfide, and the reaction product is subjected to an aftertreatment
摘要:
Polymers Ia and Ib carrying functional groups and obtainable byA)1. hydrogenation of the olefinic double bonds of a polymer IIa comprisinga) from 20 to 100% by weight of a conjugated diene,b) from 0 to 80% by weight of an aromatic vinyl compound, andc) from 0 to 20% by weight of further comonomers,to give the hydrogenated polymer IIb,2. metallation of IIb using an organoalkali metal compound to give IIc,3. reaction of IIc with a diaziridine III to give IId, and4. hydrolysis or alcoholysis of IId to give Ia, or byB)1. partial hydrogenation of IIa to give a partially hydrogenated polymer IIb',2. epoxidation of the double bonds of IIb' to give IIe, and3. reaction of IIe with a compound IV carrying functional groups, to give Ib,are suitable as viscosity index improvers for engine oils.
摘要:
Polymers Ia and Ib carrying functional groups and obtainable byA) 1. hydrogenation of the olefinic double bonds of a polymer IIa comprisinga) from 20 to 100% by weight of a conjugated diene,b) from 0 to 80% by weight of an aromatic vinyl compound, andc) from 0 to 20% by weight of further comonomers,to give the hydrogenated polymer IIb, 2. metallation of IIb using an organoalkali metal compound to give IIc, 3. reaction of IIc with a diaziridine III to give IId, and 4. hydrolysis or alcoholysis of IId to give Ia, or byB) 1. partial hydrogenation of IIa to give a partially hydrogenated polymer IIb', 2. epoxidation of the double bonds of IIb' to give IIe, and 3. reaction of IIe with a compound IV carrying functional groups, to give Ib,are suitable as viscosity index improvers for engine oils.
摘要:
The novel alkadiene/vinyl-aromatic copolymers which contain side groups and have a random, block-like or star-like structure and whose polymerized alkadiene comonomer units are partially or completely selectively hydrogenated, and which contain one or more side groups having one or more radicals capable of (4+2) cycloaddition (Diels-Alder reaction) with dienophiles are suitable as such as viscosity index (VI) improvers or can be used for the preparation of dispersant VI improvers. For this purpose, they are reacted with one or more dienophiles which are capable of a Diels-Alder (4+2) cycloaddition reaction and preferably contain strongly polar functional groups. The resulting selectively hydrogenated alkadiene/vinylaromatic copolymers having one or more side groups which constitute a (4+2) cycloadduct or a Diels-Alder adduct can be modified in their performance characteristics by further reaction with ammonia, an organic amine, an alkylene oxide, a polyalkylene oxide and/or a condensate of ammonia and/or an organic amine with an alkylene oxide.