摘要:
Thermoplastic aromatic polycarbonates having average molecular weight Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 -hydrocarbon, halogen,m is 2 or 3 andX represents hydrogen or a C.sub.6 -C.sub.12 hydrocarbon, at least one substituent X being a C.sub.6 -C.sub.12 hydrocarbon radical,in quantities of from 100 to 1 mol-% based on the total quantity of difunctional carbonate structural units in the polycarbonate.
摘要:
The present invention relates to stable and bright thermoplastic aromatic polycarbonate compositions characterized in the absence of phosphites and boric acid esters and in that they comprise an additive amount of an organic-silicon compound having on its silicon atom three or four organo-oxy radicals.
摘要:
The present invention relates to polycarbonate composition characterized in the absence therefrom of phosphites and boric acid esters which compositions are made stable and bright by the incorporation of organic silicon compounds in combination with oxetane, dioxane or tetrahydrofurane compounds.
摘要:
Thermoplastic aromatic polycarbonate molding compositions with improved flame retardancy which contain an alkali metal salt of an organic or inorganic acid and optionally a perfluoroethylene, characterized in that they contain a tetrahalogenophthalimide of the general formulae (I) or (II) or mixtures thereof ##STR1## wherein R denotes a hydrogen atom or a C.sub.1 to C.sub.4 l alkyl, C.sub.6 H.sub.5, C.sub.10 H.sub.7, C.sub.6 H.sub.4 X, C.sub.6 H.sub.3 X.sub.2 or C.sub.6 H.sub.2 X.sub.3 group, in which X denotes a fluorine, chlorine or bromine atom, R' denotes a single bond or a C.sub.2 to C.sub.4 alkylene, C.sub.6 H.sub.4 or p-diphenylene radical, and Z denotes a chlorine or bromine atom,are provided.
摘要:
The present invention relates to polycondensates of the formula 10, their use for absorbing metal ions of the transition elements of the periodic system and their use for the preparation of polymers containing metals of formula 11 which have e.g. improved resistance to heat and to chemicals compared to the corresponding polycondensates of formula 10.
摘要:
Polymerizable monomers of the formula I ##SPC1##whereinX denotes --O-- or --NH--,R denotes H--, --COOH or --COOR.sub.3,R.sub.1 denotes --H or --CH.sub.3 andR.sub.2 denotes H-- or --CH.sub.3, said monomers are obtained by acylation of 2-[4-hydroxyphenyl]-2-[5-(8-hydroxyquinolyl)]-propane or 2-[4-aminophenyl]-2-[5-(8-hydroxyquinolyl)]-propane with acid halides of the formula.
摘要:
The invention relates to a process for the preparation of optionally branched, high molecular weight polyarylene sulphides with melt viscosities which can be established at defined values and low corrosion.These polyarylene sulphides are obtained by reacting alkali metal sulphides, if appropriate mixed with alkali metal bisulphides and reaction accelerators, with dihalogenoaromatics and, if appropriate, polyhalogenoaromatics, with the addition of particular monohalogenoaromatics as chain stoppers.
摘要:
A process for the production of polycarbonates by melt transesterification is disclosed. Accordingly, polycarbonate waste is dissolved in monophenols and at an elevated temperature and in the presence of a catalyst degraded to yield oligocarbonates, diaryl carbonates and diphenols. Following the optional separation of fillers and other additives there is produced by partial recondensation and the distillation of monophenol a higher viscosity oligocarbonate having a OH and aryl carbonate terminal groups and a weight average molecular weight of 8000 to 18000, the oligocarbonate thus produced is then polycondensed to form a polycarbonate resin.
摘要:
Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical, halogen andR.sup.5, R.sup.6 and R.sup.7 represent hydrogen, iso-C.sub.3 -C.sub.5 -alkyl,one of the substituents R.sup.5, R.sup.6 or R.sup.7 not being hydrogen, in quantities of from 100 to 1 mol-%, based on the total quantity of difunctional carbonate structural units in the polycarbonate.