摘要:
Modified diene polymers containing heteroatoms are disclosed, as is their production, rubber mixtures comprising these modified diene rubbers, and to their use for the production of rubber vulcanizates, which serve, in particular, for the production of rubber moldings and the production of tires.
摘要:
A rubber composition is provided that includes a partially halogenated diene polymer that has a controllable microstructure, and no more than about 50% of the n repeat units are in blocks of three or more consecutive units. In embodiments, a reinforcing filler is also included in the rubber composition. In embodiment, the rubber composition is formed into a tire component. A method of making the composition is also provided.
摘要:
The invention relates to an energy efficient, environmentally favourable process for the preparation of brominated rubbers, in particular bromobutyl rubber, that uses a common medium for both solution polymerization and subsequent bromination of the rubber and which further exhibits an enhanced bromine usage due to the use of a oxidizing agent. More particularly, the invention relates to a process that employs a common aliphatic medium for both solution polymerization and bromination of rubber in the presence of a brominating agent and an oxidizing agent with intermediate removal of un-reacted monomers.
摘要:
Butadiene copolymers are brominated using certain quaternary ammonium tribromides as the brominating agent in a first step, and then with elemental bromine in a second bromination step. The bromination process proceeds easily under mild conditions, and produces a brominated product that has excellent thermal stability. The bromination proceeds to high conversions in shorter reaction times, when the bromination is performed using only the first bromination step.
摘要:
C₄-C₁₆-Alkylkautschuke werden bromiert, indem man die Alkylkautschuke in Gegenwart organischer Azoverbindungen und/oder Alkali- und/oder Erdalkalihypochlorite sowie in Gegenwart von linearen, verzweigten und/oder cyclischen Alkanen und Wasser bei Temperaturen von 10 bis 100°C, gegebenenfalls unter Druck, mit Brom umsetzt, wobei die Menge an Brom die 0,2- bis 1,2-fache molare Menge an im Kautschuk enthaltenen Doppelbindungen beträgt, man die 0,1- bis 3-fache molare Menge an Hypochlorit und/oder Azoverbindungen, bezogen auf die eingesetzte Menge an Brom, einsetzt, mit der Maßgabe, daß die Konzentration der Hypochlorite in wäßriger Lösung 2 bis 20 Gew.-% beträgt, und wobei man 5 bis 20 Gew.-% Wasser, 60 bis 90 Gew.-% an Alkanen und 5 bis 25 Gew.-% Alkylkautschuk, bezogen auf 100 Gew.-% der Summe an Alkylkautschuk, Alkanen und Wasser, einsetzt.
摘要:
The present invention relates to adducts of a partially hydrogenated acrylonitrile-butadiene rubber and a halogen selected from chlorine and bromine. The preferred adducts are characterized by having a surprisingly low gel content of less than ten weight per cent, as measured by weight per cent insoluble in methyl ethyl ketone after sixteen hours at 30°C.
摘要:
Ground polymeric elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties, The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and S0 2 with or without added oxygen.