Ammonium chloride as a PVC co-stabilizer
US5444111A · kind A · utility
2Cited by
23References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1994 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Jun 6, 2014 |
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.