Abstract:
The invention relates to a method for processing particulate raw polyoxymethylene, comprising the following steps: (a) adding the particulate raw polyoxymethylene to an extraction column (13), wherein the extraction column (13) is operated at a pressure in the range from 1 to 6 bar; (b) adding a polar extracting agent to the extraction column (13) at a temperature in the range from 95 to 140 °C and a pressure in the range from 1 to 6 bar, wherein 10 to 1000 ppm, in relation to the added quantity of polar extracting agent, of a buffer substance that buffers in the pH range from 7.5 to 11.5 is added to the extraction column.
Abstract:
Material de moldeo de poliamida[5,10] que contiene A) 40 a 90 % en peso de poliamida[5,10]; B) 10 a 60 % en peso de materiales de relleno que contienen fibras o minerales, y C) 0 a 20 % en peso de sustancias aditivas adicionales, en donde la suma de los porcentajes en peso de los componentes A) a C) da como resultado el 100%.
Abstract:
The present invention relates to novel and improved polyamides composed of meta-xylylenediamine and having an amino end group content of less than 15 mmol/kg. Also found have been processes for preparing these polyamides composed of meta-xylylenediamine and adipic acid and having an amino end group content of less than 15 mmol/kg, which comprises reacting salt solutions of adipic acid and m-xylylenediamine at temperatures of from 80 to 300° C. and a pressure of from 1 to 20 bar with removal of water.
Abstract:
Die Erfindung betrifft thermoplastische Formmassen, enthaltend A) 35 bis 100 Gew.-% eines amorphen Polyamids, aufgebaut aus A) 30 bis 100 Gew.-% Einheiten, die sich von aliphatischen Dicarbonsäuren und tetraalkylsubstituierten cycloaliphatischen Diaminen ableiten, A) 0 bis 70 Gew.-% Einheiten, welche sich von weiteren Polyamid bildenden Monomeren ableiten, verschieden von A), B) 0 bis 75 Gew.-% weitere Zusatzstoffe, wobei die Summe der Gewichtsprozente A) und B) 100% ergeben.