摘要:
This invention relates to mixtures of polychloroprene elastomers which are distinguished by their good processibility and excellent cold resistance.
摘要:
Compounds corresponding to the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are the same or different, and represent hydrogen, hydroxy, C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.1 -C.sub.16 alkylthio, C.sub.6 -C.sub.14 aryl, C.sub.6 -C.sub.14 aryl-C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.18 alkoxy, C.sub.6 -C.sub.14 aryloxy, C.sub.6 -C.sub.14 -aryl-C.sub.1 -C.sub.4 alkyloxy, halogen or a hydrocarbon radical which has from 1 to 18 carbon atoms and has one or more double bonds, andR.sub.6 represents a linear or branched, saturated or mono- or poly-unsaturated hydrocarbon radical having from 1 to 22 carbon atoms or a radical of the formula ##STR2## wherein R.sub.1 to R.sub.5 have the above-mentioned meaning.
摘要:
By the use of special cross-linkers that contain at least two isocyanate groups, hydroxyl group-containing optionally hydrogenated nitrile rubber polymers can be successfully cross-linked. Preferred cross-linkers contain allophanate, biuret, uretdione, uretonimine, bridged carbamate, carbodiimide, isocyanurate, iminooxadiazinedione or oxadiazinetrione structural elements.
摘要:
There are provided novel vulcanizable compositions based on optionally fully or partly hydrogenated nitrile rubbers containing epoxy groups, and specific crosslinkers, which no longer require use of conventional crosslinkers, more particularly sulphur. The vulcanizates producible therefrom possess very good compression sets at room temperature, 100° C. and 150° C., and additionally exhibit high tensile strength combined with good elongation at break.
摘要:
A new polymer composition comprising (i) a polymer having a main polymer chain derived from (ia) at least 30% by weight to 100% by weight based on the polymer of a first monomer which introduces at least one of a secondary carbon and a tertiary carbon to the main polymer chain, and (ib) in the range of from 0 to 70% by weight based on the polymer of at least one other monomer; (ii) at least one lithium salt; and (iii) at least one antioxidant is provided, as well as a process for producing a polymer vulcanizate comprising the step of vulcanizing the polymer composition mentioned above additionally comprising a vulcanization system. A method for improving the hot air aging and aqueous fluid resistance characteristics of the polymer mentioned above comprises the step of admixing said polymer with at least one lithium salt and at least one antioxidant is also provided.
摘要:
Novel crosslinkable compositions based on elastomers, at least one of which has carboxyl and/or carboxylate groups, are provided, these crosslinkable compositions containing special unsaturated organic salts of metal ions and a crosslinking system which acts as a free radical donor. Crosslinked elastomers which have excellent physical properties are obtainable therefrom. The novel crosslinkable compositions have a wide range of uses.
摘要:
The present invention relates to a process for reducing mold contamination in an injection molding process by using a mixture of nitrile rubbers, in the range of from 0.1-0.5 wt. % of fatty acids and optionally further additives.
摘要:
This invention relates to a mixture containing one or more olefin rubbers and one or more nitrile rubbers, to a process for the production thereof, to a vulcanizable mixture and to a process for the production thereof as well as to moldings of all kinds producible from the mixtures.
摘要:
The invention relates to vulcanizable compositions comprising (a) at least one ethylene-vinyl acetate copolymer containing epoxy groups and having a vinyl acetate content of at least 20% by weight, preferably at least 30% by weight, more preferably at least 40% by weight, based on the ethylene-vinyl acetate copolymer containing epoxy groups, and (b) at least one carboxylated nitrile rubber.
摘要:
There are provided novel vulcanizable compositions based on optionally fully or partly hydrogenated nitrile rubbers containing epoxy groups, and specific crosslinkers, which no longer require use of conventional crosslinkers, more particularly sulphur. The vulcanizates producible therefrom possess very good compression sets at room temperature, 100° C. and 150° C., and additionally exhibit high tensile stress combined with good elongation at break.