| 摘要 |
STABILIZED RIGID POLYVINYL CHLORIDE COMPOSITIONS Polyvinyl chloride compositions are provided which are stabilized against the adverse effects of ultraviolet radiation by the addition thereto of effective amounts of a 2,2,6,6-tetraalkyl-piperidine compound and an organotin carboxylate or alcoholate stabilizer, optionally with reduced amounts of titanium dioxide, organotin mercapto esters and/or organotin mercaptide stabilizers. The compositions do not contain any lead stabilizers. The compositions can be processed to rigid PVC products with excellent resistance to thermal degradation and improved long term stability. |
