Method for preparation of polymethacrylates by the anionic polymerization
US3970609A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | May 6, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparation of polymethacrylate esters by the anionic polymerization characterized by application of new initiation systems based on esters of .alpha.-lithio carboxylic acids having 2-30 carbon atoms in a straight or branched chain and 1-6 ester groups in a molecule, or on their adducts or complexes with lithium alkoxides having 3-16 carbon atoms in a straight or branched chain. The polymerization is carried out at temperatures -70.degree. to +50.degree. C, preferably at +20.degree. C, with the monomer - to - initiator ratio equal 10 to 1500. The polymers which have new mechanical and solution properties due to the new preparation method are suitable as additives into mineral oils increasing their viscosity indexes and suppressing their solidification temperature, as a cement in medical practice, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.