Cationic polymerization
US4393199A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | May 12, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2669
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Method of carrying out cationic polymerization with molecular weight control in which a preinitiator precursor, e.g. a diol and a catalyst effective for cationic polymerization (or a preformed adduct of such precursor and catalyst) are mixed with a monomer (e.g. a cyclic ether) in proportions of one mol of precursor or adduct and n mols of monomer, where n is the relatively small number of mer units desired in the polymer, causing polymerization to proceed to completion, then treating the resulting living cationic polymer as desired, e.g. quenching with water to introduce a terminal hydroxyl group, adding another monomer to produce a block polymer, reacting with an anionic polymer, etc. Also polymers so formed. Such polymers have low polydispersity and conversion and yield of the desired polymer are high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.