摘要:
Ring opening polymerisation of cyclooctadiene-(1,5) (COD) optionally in an inert organic solvent on a catalyst ofA. a tungsten salt,B. a halogenated alcohol in which the halogen and OH group are attached to adjacent carbon atoms, and/or an epoxide and/or a halogenated phenol, andC. an organo aluminium compound and/or an aluminium halide.
摘要:
A process for the preparation of a catalyst for the polymerization and copolymerization of cyclic olefins which have 4, 5, 7 or more ring carbon atoms and at least one olefinic double bond in the ring, fromA. at least one halide or oxyhalide of molybdenum, preferably with molybdenum in the oxidation state +5,B. at least one 2-halo alcohol andC. at least one aluminium compound in the molar ratio of a : b = 1 : 1 to 1 : 10 and a : c = 1 : 0.5 to 1 : 30,Characterized in that the molybdenum halide or oxyhalide and the 2-halo alcohol are reacted with the exclusion of solvents or in the presence of chlorinated solvents which are inert towards the molybdenum salt and in which the molybdenum salt is soluble to an extent of at least 0.01 molar, and the aluminium alkyl compound is added, optionally in the presence of the monomers.
摘要:
Catalysts obtained fromA. a reaction product of 1 mol tungsten hexachloride with from 1 to 4 mols of a mixture of 2-chloroethanol and 2,2,2-trichloroethanol in a molar ratio of from 1 : 3 to 3 : 1; andB. from 1 to 20 mol, per mol of tungsten in component (A), of an organometallic aluminium for disproportionation and metathesis of olefin and for ring opening polymerization of cyclic olefins.
摘要:
Catalysts obtained fromA. a reaction product of 1 mol tungsten hexachloride with from 1 to 4 mols of a mixture of 2-chloroethanol and 2,2,2-trichloroethanol in a molar ratio of from 1 : 3 to 3 : 1; andB. from 1 to 20 mol, per mol of tungsten in component (A), of an organometallic aluminium for disproportionation and metathesis of olefin and for ring opening polymerizaton of cyclic olefins.
摘要:
The present invention is directed to cross-linkable, thermoplastically processable, segmented, high molecular weight polycarbonate elastomers, to the process for their preparation and to their use in their cross-linked form.
摘要:
The subject of instant invention is a process for the preparation of aliphatic-aromatic polycarbonates with diphenol carbonate end groups, the polycarbonates obtained therefrom and their use for the preparation of high-molecular, segmented, aliphatic-aromatic polycarbonate elastomers which can be processed as thermoplastics.
摘要:
A process for the polymerisation of cyclooctadiene-(1,5) wherein cyclooctadiene-(1,5) is polymerised on halides of tungsten, molybdenum, tantalum, or rhenium as catalyst in the presence of bicyclo-[2,2,1]-heptadienes-(1,5) of the general formula (I) ##SPC1##as activator, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denoting independently of each other, a monovalent hydrocarbon radical or hydrogen.
摘要:
The disclosed invention is concerned with porous substrates impregnated with moisture curing polyurethane oligomers incorporating tertiary nitrogen atoms and free aromatic isocyanate groups in which the yellowing tendency of these isocyanates is diminished or supressed by the inclusion of specific light protection agents. These agents are either substituted oxalanilides or indole or indoline derivatives. The impregnated substrates cure rapidly when exposed to moisture to yield rigid structures suitable as a replacement for Plaster of Pairs in medicinal and veterinary bandaging applications.
摘要:
A photographic apparatus for plate thermography comprising a support having a holder for a thermographic plate at one end and a photographic camera with flashlight at the opposite end. An adaptor designed to be mounted on the support and locked to it is provided for the attachment of different camera systems. Bus bars or contact rails are provided both on the support and in the adaptor so that when the adaptor is placed in position, electrical contact is established between the flashlight and a source of current on the support.
摘要:
In vehicle seat frames the overload protection during the deformation of the brackets (4; 5) of the fittings (3) as a result of impact stresses includes a particular force path in that a fixed point connection (20) and a sliding connection (21) are formed by connecting bolts (9; 10, 22; 26) between at least one bracket (4; 5) of each fitting (3) and the lower seat part (1) or backrest (2).