Synthesis of dithioester chain transfer agents and use of bis(thioacyl) disulfides or dithioesters as chain transfer agents
US6512081B1 · kind B1 · utility
32Cited by
1References
25Claims
0Family size
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Key dates
| Filing date | Jan 22, 2001 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Jan 22, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2438/03
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to the synthesis of dithiocarboxylic acid esters by reaction of bis(thioacyl) disulphides, thioacetals or vinylidane bis(thioether) with free-radicals (optionally in the presence of monomers). The invention also relates to processes for the synthesis of polymers utilising these dithioesters as polymerisation regulators (chain transfer agents) or to the use of bis(thioacyl) disulphides to generate dithioester chain transfer agents in situ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.