Rapid-crystallizing polyphenylene sulphide compositions
AssigneeBayer Aktiengesellschaft
InventorsPeter Bier, Klaus Reinking, Ludwig Bottenbruch, Erhard Tresper
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Abstract
The invention relates to highly crystalline, rapid-crystallizing, thermoplastic compositions of polyphenylene sulphides and thioethers.
Claims3
A highly crystalline, rapid-crystallizing, thermoplastic composition comprising
- (a) 70-99.5% by weight of a polyphenylene sulphide having a melt viscosity of at least 5 Pas, measured at 306.degree. C. under a shearing stress of 10.sup.3 Pa, and
- (b) 0.5-30% by weight, relative to (a) and (b), of a thioether selected from ##STR5## or mixtures thereof where
- R.sub.1 represents a divalent C.sub.1 -C.sub.10 -aliphatic,
- C.sub.5 -C.sub.12 -cycloaliphatic, C.sub.7 -C.sub.24 -araliphatic or C.sub.6 -C.sub.24 -aromatic radical,
- R.sub.2 represents identical or different C.sub.1 -C.sub.10 -alkyl, C.sub.5 -C.sub.12 -cycloalkyl, C.sub.7 -C.sub.12 -aralkyl,
- C.sub.6 -C.sub.24 -aryl radicals which are substantially inert towards polyphenylene sulphide under injection moulding conditions,
- x represents the number 0 or 1 and
- y represents a whole number from 1 to 50.
A process for preparing a highly crystalline, rapid-crystallizing, composition thermoplastic characterized in that 70-99.5% by weight of a polyphenylene sulphide having a melt viscosity of at least 5 Pas, measured at 306.degree. C. under a shearing stress of 10.sup.3 Pa, and 0.5-30% by weight of a thioether are mixed by adding the thioether to the polyphenylene sulphide melt and homogenizing the mixture in the melt and where the thioether is selected from ##STR6## or mixtures thereof where
- R.sub.1 represents a divalent C.sub.1 -C.sub.10 -aliphatic,
- C.sub.5 -C.sub.12 -cycloaliphatic, C.sub.7 -C.sub.24 -araliphatic or C.sub.6 -C.sub.24 -aromatic radical,
- R.sub.2 represents identical or different C.sub.1 -C.sub.10 -alkyl, C.sub.5 -C.sub.12 -cycloalkyl, C.sub.7 -C.sub.12 -aralkyl,
- C.sub.6 -C.sub.24 -aryl radicals which are substantially inert towards polyphenylene sulphide under injection moulding conditions,
- x represents the number 0 or 1 and
- y represents a whole number from 1 to 50.
A method of making a molded article comprising casting a mixture of a polyphenylene sulphide having a melt viscosity of at least 5 Pas, measured at 306.degree. C. under a shearing stress of 10.sup.3 Pa, and a thioether into a mould which has a temperature of not more than 120.degree. C., the amount of thioether being chosen in such a way that the injection-moulded polyphenylene sulphide has at least 70% of the crystallinity which is obtained on injection moulding a moulding from unmodified polyphenylene sulphide at mould temperatures of at least 130.degree. C., where the thioether is selected from ##STR7## or mixtures thereof where
- R.sub.1 represents a divalent C.sub.1 -C.sub.10 -aliphatic,
- C.sub.5 -C.sub.12 -cycloaliphatic, C.sub.7 -C.sub.24 -araliphatic or C.sub.6 -C.sub.24 -aromatic radical,
- R.sub.2 represents identical or different C.sub.1 -C.sub.10 -alkyl, C.sub.5 -C.sub.12 -cycloalkyl, C.sub.7 -C.sub.12 -aralkyl,
- C.sub.6 -C.sub.24 -aryl radicals which are substantially inert towards polyphenylene sulphide under injection moulding conditions,
- x represents the number 0 or 1 and
- y represents a whole number from 1 to 50.
Dependencies are inferred from the claim text.