摘要:
The invention relates to an anhydrous process for the preparation of high molecular weight, optionally branched polyarylene sulphides. These can be prepared in a polar organic solvent in the absence of water by reaction of dihalogenoaromatics with sodium sulphides and bisulphide or potassium sulphides and bisulphide in the presence of catalysts in a polar organic solvent.
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.
摘要:
Flame-resistant, thermoplastic polyamide moulding materials which contain 0.01-4% by weight of polyphenylene oxides as flameproofing agent and which are prepared by mixing the components in the melt.
摘要:
This invention relates to a process for the preparation of optionally branched polyarylene sulphides which are distinguished by their substantially lower corrosiveness.
摘要:
A process for removing onium salts from aqueous solutions comprising adding a phenolic compound to an onium salt containing aqueous solution, contacting the solution with a water-immiscible organic material whereby the onium salt migrates into the water-immiscible organic material and separating the aqueous hase from the onium salt in the water-immiscible organic material.
摘要:
Aromatic polyesters based on diphenols, terephthalic and isophthalic acid and particular chain terminators exhibit an improved color number, an improved flowability and increased dimensional heat stability with otherwise comparable mechanical characteristics.
摘要:
The present invention relates to a process for the preparation of thermoplastic, aromatic polycarbonates which contain structural units of the formulae 1 and/or 2 ##STR1## in which R denotes C.sub.1 -C.sub.3 -alkyl, preferably CH.sub.3, andX denotes a single bond, C.sub.1 -C.sub.5 -alkylene, C.sub.2 -C.sub.5 -alkylidene, cyclohexylene, cyclohexylidene, --O-- or --S--.
摘要:
The present invention relates to a process for the preparation of branched thermoplastic polycarbonates, characterized in that diphenols are completely reacted with about 0.05 to about 2.0 mol %, relative to mols of diphenols, of cyanuric chloride in a primary reaction, while controlling the pH and temperature and in the presence of a co-solvent, and thereafter the products are subjected to polycondensation, in accordance with known methods of the phase boundary process, to give high-molecular weight, branched polycarbonates. The invention further relates to the branched polycarbonates prepared by this process.
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:
Flameproof thermoplastic polyamide moulding materials which contain 2 to 20% by weight, based on the polyamide, of at least one non-halogenated cyclic aromatic inside compound.