Production of vinyl halide polymers with dialkyl, hydroxy phenyl alkanoic ester of polyhydric alcohols
US4324874A · kind A · utility
3Cited by
6References
2Claims
0Family size
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Key dates
| Filing date | Oct 8, 1980 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Oct 8, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F14/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into the polymerization reaction mixture when from 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent that is a dialkylhydroxyphenylalkanoic acid ester of a neopentyl polyhydric alcohol, such as pentaerythritol tetrakis-[3-(3,5-di-tert.butyl-4-hydroxyphenyl)propionate].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.