Method of preparing synthetic rubber latex having a large particle size
US6656999B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2000 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Feb 16, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08C1/07
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a method of preparing a synthetic rubber latex having a large particle size, showing good stability and reducing coagulum during polymerization, which comprises (a) pretreating a seed synthetic rubber latex by mixing the seed synthetic rubber latex with deionized water and a small amount of an emulsifier and stirring, (b) preparing an agglomerating latex with a pH value of about 5.0˜8.0 by mixing a copolymer latex containing unsaturated acid having from about 10 to about 50% by weight of solid content with deionized water and a pH controlling agent, and (c) adding the pretreated seed synthetic rubber latex of step (a) to the agglomerating latex of step (b). The step (c) may be carried out by adding the pretreated seed synthetic rubber latex dropwisely to the agglomerating latex containing unsaturated acid for about 30 minutes to about 1 hour.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.