Ammonium chloride as a PVC co-stabilizer
US5532303A · kind A · utility
1Cited by
1References
8Claims
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Key dates
| Filing date | Apr 27, 1995 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Apr 27, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/58
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The presence of ammonium halide in a PVC composition along with conventional primary heat stabilizers enhances the heat stability during the early stages of extrusion into pipe and other articles of manufacture. The ammonium halide which is formed as a by-product of the reaction of a metal halide such as zinc chloride or an organotin chloride with a mercaptoester in the presence of ammonia or an amine may be left in the product or a separate source of the ammonium halide may be used to provide the enhanced heat stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.