| 摘要 |
Improved activation of the blowing agent used to form blown PVC products, as well as thermal stabilization, are provided by a combination of an ester of the formula (R1)1-2Sn(-S-Ra-OC(=O)R2)2-3 wherein R1 is C1-4 alkyl, Ra is alkyl, and R2 is C6-24 alkyl or alkenyl; one or both of mono (C1-4 alkyl) and di(C1-4 alkyl) tin sulfides; a complex of diorganotin oxide with an oxygen-containing acid; and optionally an ester HS-Rc-OC(=O)R3 wherein Rc is alkyl and R3 is C6-24 alkyl or alkenyl.
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