Polyol esters of zinc mercaptoacids as heat stabilizers for PVC processing
US5536767A · kind A · utility
8Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K13/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A zinc mercaptoacid ester of a polyhydric alcohol or ether, carboxylate, or ether-carboxylate thereof having at least one functional hydroxy group are improved heat stabilizers for halogen-containing polymer compositions. The phenomenon known as zinc burn during processing of such compositions is eliminated. Zinc bis-thioglycolates, zinc mercaptopropionates and zinc bis-mercaptosuccinates of glycols, glycerol, glycol ethers, glycol carboxylates, and glycerol carboyxlates exemplify the new class of heat stabilizers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.