Method for synthesizing homopolymer N-vinyl butyrolactam with super-low molecular weight and super-low residual monomer
US9453087B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2012 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Nov 1, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F126/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A synthesis method of ultra low molecular weight homopolymerized N-vinyl butyrolactam with ultra low residual monomer content is provided N-vinyl butyrolactam monomers and water are provided with the mass ratio of 3:17˜8:12 0.5%˜5.0% by weight of initiators, 0.1%˜5.0% by weight of a catalyst, and 0.1%˜10% by weight of a molecular weight regulator are provided in the presence of an inert gas, adding the above mentioned raw materials in batches, adjusting the pH of the reaction system to 7.0-8.0 with an activator, reacting at the polymerization temperature of 60-85° C. A peroxide is added and maintaining the temperature for 2 hours, to obtain an aqueous solution of ultra low molecular weight homopolymerized N-vinyl butyrolactam. The aqueous solution is dried to obtain a powdery ultra low molecular weight homopolymerized N-vinyl butyrolactam with ultra low residual monomer content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.