摘要:
A solution polymerisation process carried out continuously in a cascade produces high molecular weight gel-free ethylene terpolymers having on the one hand high resistance to fuels, oils and organic solvents and on the other hand high flexibility even at low temperatures when narrow ranges are adhered to in respect of solvent content, pressure, temperature control and degree of conversion.
摘要:
High molecular weight, gel-free ethylene/vinyl acetate copolymers may be prepared by the process of solution polymerization if a particular relationship of temperature/pressure is observed.
摘要:
The random, hydrogenated copolymers according to the present invention of unsubstituted conjugated dienes and substituted conjugated dienes, having a glass transition temperature of ≦−60° C., an enthalpy of fusion of ≦100 J/g and a content of residual double bonds in the range from 0 to 80%, are suitable for the production of rubber moldings of all kinds which have good resistance to ageing and high resilience at low temperatures. In particular, various tire components and industrial rubber articles may be mentioned as rubber moldings. The copolymers are also suitable for the rubber modification of brittle thermoplastics.
摘要:
The random, hydrogenated copolymers according to the present invention of unsubstituted conjugated dienes and substituted conjugated dienes, having a glass transition temperature of ≦−60° C., an enthalpy of fusion of ≦100 J/g and a content of residual double bonds in the range from 0 to 80%, are suitable for the production of rubber moldings of all kinds which have good resistance to ageing and high resilience at low temperatures. In particular, various tire components and industrial rubber articles may be mentioned as rubber moldings. The copolymers are also suitable for the rubber modification of brittle thermoplastics.
摘要:
Ethylene/vinyl acetate copolymers containing very high molecular weight components and having a reduced tendency to tackiness may be obtained by a further addition of ethylene during the process of solution polymerization at a moderate pressure.
摘要:
The present invention relates to a process for the copolymerization of conjugated diolefins with non-conjugated olefins in the presence of rare earth metal catalysts. The advantages of the process according to the invention are in particular the high selectivity, good space-time yield and the possibility of being able to vary the reaction conditions within a wide range.
摘要:
This invention relates to a process for the production of polydienes having controlled Mooney viscosity, carried out by means of catalysts based on rare earth compounds, which is characterized in that the conjugated dienes used are polymerized in the presence of from 0.005 to 80 wt. % of 1,2-dienes, based on the sum of conjugated dienes used and of 1,2-dienes used. The polydienes thus produced are used particularly in the manufacture of car tires.
摘要:
This invention relates to a method for the suspension polymerization of conjugated dienes in hydrocarbon mixtures comprising a fraction by volume greater than 80% of C4 hydrocarbons wherein polymerization is conducted in the presence of a rare earth compound, of one or more aluminum compounds, and optionally of an additional Lewis acid. The invention further relates to the polymers which can be produced according to the present invention and to the use thereof for the production of moldings of all types, particularly tires and industrial rubber products, and for blending with polystyrene (HIPS).
摘要:
The present invention relates to poly-(C.sub.2 -C.sub.10 -.alpha.-olefine)-carboxylic acids of Mw (weight average) 2000 to 350,000, to their preparation by oxidative degradation of polyolefines or by reaction of "Living" polyolefines with CO.sub.2, to their conversion into poly-(C.sub.2 -C.sub.10 -.alpha.-olefine)-carbonyl halides and to their use for preparing polyolefine/polycarbonate block copolymers and the block copolymers obtainable by the process according to the invention.
摘要:
Uranium-containing mixed catalysts containing uranium in the formal oxidation state +4 as uranium salts of carboxylic acids, a Lewis acid, and an organometallic aluminum compound are prepared and can be used for stereospecific polymerization of diolefins or mixtures of diolefins and monoolefins.