摘要:
The present invention is directed to a process for the preparation of a segmented, aliphatic-aromatic polyether-copolycarbonate containing structural units conforming to ##STR1## wherein --D-- is a diphenolate radical and units conforming to ##STR2## wherein --O--Polyether--O-- is an aliphatic polyether-diolate radical, by the phase boundary process in which aliphatic polyether diol and a mixture of dihydroxy compounds are reacted with a carbonic acid halide which is employed in molar excess in relation to the dihydroxy compounds and in which the aqueous phase is kept at a pH value of at least 13 and where the polycondensation reaction is carried out in a reactor by addition of an amine catalyst.The invention is further directed to the polyether polycarbonate which is obtained by the process and to the preparation of membranes from said polyether copolycarbonate.
摘要:
The present invention relates to a process for the preparation of polycarbonate shaped articles from polycarbonates stabilized with phosphanes by the devolatilizing injection-moulding or devolatilizing extrusion process.
摘要:
Process for the production of a suspension of polyacetylene in the form of particles having a diameter of from 0.01 to 1 mm and having a great number of fibrous appendices comprising introducing acetylene in an organic suspending agent under constant stirring, in the presence of an aluminum-containing organometallic mixed catalyst in an amount corresponding to 10 to 100 m moles aluminium per liter suspending agent, at temperatures of from -100.degree. to 80.degree. C., until a maximum of 10 g, preferably 1 to 3 g of polyacetylene per liter of suspending agent have been formed.
摘要:
Ester-modified polyamides containing of from 50 to 80% by weight of --HN--(CH.sub.2).sub.5 --CO units are obtained by reaction of .gamma.-caprolactam and mixtures of dicarboxylic acids, primary diamines and polyalkylene glycols and are suitable inter alia as hot melt adhesives and for the elastification of thermoplastic materials.
摘要:
Polymer blends with improved impact strength consisting essentially of a polyamide and a copolymer of an .alpha.-olefine, an amide and an ester of an .alpha.,.beta.unsaturated carboxylic acid.
摘要:
Copolyamides with improved properties are obtained by polycondensing aliphatic and/or aromatic dicarboxylic acids with an amine mixture of diaminodicyclohexyl methanes and optionally homologous polycyclohexyl polyamines and one or more aliphatic diamines, said copolyamide being useful for the production of shaped articles such as films, sheets and injection moldings.
摘要:
A moulding composition consisting of:From 60 to 93 parts, by weight, of a polyamide;From 6 to 30 parts, by weight, of a polyethylene; andFrom 1 to 20 parts, by weight, of a copolymer of an aromatic vinyl compound, an .alpha., .beta.-unsaturated mono- and/or di-carboxylic acid or an anhydride thereof, free acid groups optionally being neutralized by a mono- and/or poly-amine or with ammonia, and an ester of the said mono- and or di-carboxylic acid.
摘要:
Polymer mixtures consisting essentially ofA. a polyethylene with a melt index of above 15 g/10 min,B. a graft polymer of an ethylene/(meth)acrylic acid copolymer as graft substrate and grafted polymerized units of .epsilon.-caprolactam, andC. a poly-.epsilon.-caprolactam.
摘要:
Liquid stoving-lacquer systems based on oil-free polyesters obtained by reacting polybasic carboxylic acids or their anhydrides and 2-ethylpropane diol-1.3 and optionally additional polyhydric alcohols, are highly compatible with melamine resins.
摘要:
An aqueous two-component coating agent whose binder consists essentially of a combination of a) a polyol component present dissolved and/or dispersed in water comprising a1) at least one water-dilutable polymerisation resin or polycondensation resin with a molecular weight Mn of over 500 possessing hydroxyl groups and a2) a reactive diluent consisting of at least one water-soluble compound with a molecular weight Mn of under 500 capable of reacting with isocyanate groups and b) a polyisocyanate component with a viscosity at 23.degree. C. of from 50 to 10 000 mPa present emulsified in the aqueous solution or dispersion, a method for producing such coating agents wherein the said polyisocyanate component is emulsified in the said aqueous solution or dispersion with the optional incorporation of auxiliary substances and additives in the system prior to adding the polyisocyanate, and the use of the coating agents for the production of air-drying and/or heat-drying coatings.