Polyvinyl chloride lubricant
US5077331A · kind A · utility
12Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1988 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Jan 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/103
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Propylene glycol esters of unsaturated fatty acids having from 8 to 20 carbon atoms are found useful as internal lubricants for polyvinyl chloride. As compared to commonly used materials, the use of propylene glycol ester results in improved optical properties, as for example low yellowing after processing and resistance to hazing upon immersion in liquids. The lubricants are used in the manufacture of PVC by bulk or suspension polymerization. Broadly from 0.1 to 5 wt. % of the ester is incorporated into the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.