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US 5,852,070 AGranted
(Co) polycarbonates stabilised against .gamma.-radiation
AssigneeBayer Aktiengesellschaft
InventorsWolfgang Ebert, Ralf Hufen, Heidemarie Pantke, Klaus Berg
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Abstract
The present invention provides polycarbonate moulding compositions containing polycarbonates, stabilisers of the general formula (I) R.sub.1 --X--(CHR.sub.4).sub.n --Y--R.sub.2, where X and Y, are either ##STR1## , and Y may also be --S--, and optionally polypropylene glycols. The present invention also provides use of these moulding compositions for preparing items for medical applications.
Claims12
A polycarbonate moulding composition comprising:
- a) 97.5 wt. % to 99.9 wt. % of a polycarbonate;
- b) a .gamma.-radiation stabiliser composition comprising 0.1 wt. % to 2.5 wt. % of a stabiliser having the formula (I):
- ##STR9## R.sub.1 and R.sub.2, independently of each other, represent a methyl group, a C.sub.7 -C.sub.18 optionally branched and/or substituted alkylaryl group or a C.sub.6 aryl group R.sub.4 represents a methyl group, a C.sub.2 -C.sub.18 optionally branched and/or substituted alkylaryl group, a C.sub.6 aryl group or H,
- n is a number between 1 and 8, and
- Y represents ##STR10## or --S--;
- and c) 0.05 wt. % to 5 wt. % of an optionally terminally capped and/or branched polypropylene glycol having an average molecular weight of 200 to 200,00, wherein the percentages by weight of each component are with reference to 100 wt. % of a)+b).
3 more elements
A polycarbonate moulding composition consisting essentially of:
- a) 97.5 wt. % to 99.9 wt. % of a polycarbonate;
- b) a .gamma.-radiation stabiliser composition comprising 0.1 wt. % to 2.5 wt. % of a stabiliser having the formula (I):
- ##STR12## where R.sub.1 and R.sub.2, independently of each other, represent a methyl group, a C.sub.7 -C.sub.18 optionally branched and/or substituted alkylaryl group or a C.sub.6 aryl group, R.sub.4 represents a methyl group, a C.sub.7 -C.sub.18 optionally branched and/or substituted alkylaryl group, a C.sub.6 aryl group or H,
- n is a number between 1 and 8, and
- Y represents ##STR13## or --S--;
- and c) 0.05 wt. to 5 wt. % of an optionally terminally capped and/or branched polypropylene glycol having an average molecular weight of 200 to 200,000, wherein the percentages by weight of each component are with reference to 100 wt. % of a)+b).
3 more elements
Dependencies are inferred from the claim text.