Combination heat stabilizer/lubricant for PVC processing and method for producing the same
US5332772A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1993 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | May 5, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/37
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The preparation of a zinc mercaptoacid ester by the reaction of zinc oxide with the mercaptoacid ester in a wax matrix provides an improved heat stabilizer for halogen-containing polymer compositions. The process obviates the necessity of isolating and transporting the normally very viscous zinc mercaptoacid esters. The zinc mercaptoacid ester/wax matrix is also an expedient medium for the preparation and utilization of calcium stearate as a lubricant in the heat stabilizer composition and the stabilized polymer composition containing it. A paraffin wax is the preferred matrix for the preparation and use of the heat stabilizer and lubricant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.