Continuous polymerization process and products therefrom
US6566549B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Sep 29, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/281
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A continuous process for oligomers which do not contain, as polymerized units, carboxylic acid-containing monomers and their salts, including the steps of:(1) forming a reaction mixture, substantially free of carboxylic acid-containing monomers and their salts, containing:(i) 0.5 to 99.95% by weight of the reaction mixture of at least one ethylenically unsaturated monomer; and(ii) 0.05 to 25% by weight, based on the weight of the ethylenically unsaturated monomer, of at least one free-radical initiator; and(2) continuously passing the reaction mixture through a heated zone wherein the reaction mixture is maintained at a temperature of at least 150° C. and a pressure of at least 30 bars for from 0.1 seconds to 4 minutes to form terminally-unsaturated oligomers.In addition, processes for forming oligomers of vinyl acetate and oligomers of vinyl alcohol are disclosed. Mixtures of fully saturated and terminally unsaturated oligomers are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.