Compositions for shortstopping free radical emulsion polymerizations and stabilizing latices made therefrom
US6723255B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2001 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Mar 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F36/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed are compositions for shortstopping free radical emulsion polymerizations and stabilizing polymers produced from the corresponding emulsion processes. Such compositions include at least one hydrophillic radical scavenger (i.e, shortstopper) and at least one hydrophobic radical scavenger. The compositions are preferably targeted for applications in the emulsion processes of rubber latexes. These compositions exhibit excellent performance not only as shortstoppers of free radical emulsion polymerizations but also as stabilizers of the corresponding polymers. Thus, the compositions prevent additional polymerization in the particles without requiring additional stabilizer even after such polymers are steam stripped. They do so without the use of chemicals which carry a high safety, health, or environmental risk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.