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US 5,856,486 AGranted
Polycarbonate compositions comprising hindered amine light stabilizers
AssigneeGeneral Electric Company
InventorsJames Edward Pickett, Randall Lee Carter, Gary Eugene Spilman
Life of this patent
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Abstract
The instant invention relates to weatherable polycarbonate compositions (formulations or blends) comprising piperazinone or piperazine dione based HALS. These piperazinone or piperazine dione based HALS impart photostability to the polycarbonate formulations, thereby reducing yellowing or other forms of light induced degradation.
Claims12
A composition comprising:
- (a) a polycarbonate;
- and
- (b) a piperazinone based HALS selected from:
- ##STR14## wherein:
- R.sup.1 and R.sup.2 are independently C.sub.1-24 alkyl, hydrogen, C.sub.1-12 haloalkyl, C.sub.2-14 alkenyl or unsubstituted C.sub.7-14 aralkyl;
- R.sup.3 and R.sup.4 are independently C.sub.1-18 haloalkyl, C.sub.1-18 alkyl, C.sub.5-18 cycloalkyl, C.sub.2-18 alkenyl, or unsubstituted C.sub.7-18 aralkyl;
- or R.sup.3 and R.sup.4, when taken together with the carbon to which they are attached, form a C.sub.4-11 alicyclic ring;
- R.sup.5 and R.sup.6 are independently C.sub.1-18 haloalkyl, C.sub.1-18 alkyl, C.sub.2-18 alkenyl, or unsubstituted C.sub.7-18 aralkyl;
- or R.sup.5 and R.sup.6 when taken together with the carbon atom to which they are attached, form a C.sub.4-11 alicyclic ring;
- R.sup.17 is ##STR15## R.sup.18 is H or C.sub.1-4 alkyl.
7 more elements
A composition comprising:
- (a) a polycarbonate;
- (b) a piperazinone based HALS;
- (c) an additive;
- and
- (d) a blend stock;
- said HALS being selected from:
- ##STR16## wherein:
- R.sup.1 and R.sup.2 are independently C.sub.1-24 alkyl, hydrogen, C.sub.1-12 haloalkyl, C.sub.2-14 alkenyl or unsubstituted C.sub.7-14 aralkyl;
- R.sup.3 and R.sup.4 are independently C.sub.1-18 haloalkyl, C.sub.1-18 alkyl, C.sub.5-18 cycloalkyl, C.sub.2-18 alkenyl, or unsubstituted C.sub.7-18 aralkyl;
- or R.sup.3 and R.sup.4, when taken together with the carbon to which they are attached, form a C.sub.4-11 alicyclic ring;
- R.sup.5 and R.sup.6 are independently C.sub.1-18 haloalkyl, C.sub.1-18 alkyl, C.sub.2-18 alkenyl, or unsubstituted C.sub.7-18 aralkyl;
- or R.sup.5 and R.sup.6 when taken together with the carbon atom to which they are attached, form a C.sub.4-11 alicyclic ring;
- R.sup.17 is ##STR17## R.sup.18 is H or C.sub.1-4 alkyl.
10 more elements
Dependencies are inferred from the claim text.