Control of molecular weight and end-group functionality in polymers
US6235857A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 3, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Apr 3, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F14/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to a process for the production of lower molecular weight polymers by free radical-initiated polymerization of unsaturated species characterized by the use of an unsaturated compound of Formula I as a chain transfer agent: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and are selected from the group consisting of hydrogen, optionally substituted alkyl, optionally substituted saturated or aromatic carbocyclic or heterocyclic ring, and halogen; PA1 X is selected from the group consisting of chlorine, bromine, optionally substituted alkylsulfonyl, and optionally substituted arylsulfonyl, PA1 Y is selected from the group consisting of halogen, a polymer chain, and CR.sup.3 R.sup.4 Z, wherein R.sup.3 and R.sup.4 are the same or different and are selected from the group consisting of hydrogen, optionally substituted alkyl, optionally substituted saturated, unsaturated or aromatic carbocyclic or hetercyclic ring, and halogen; and PA1 Z is selected from the group consisting of chlorine, bromine, optionally substituted alkylsulfonyl and optionally substituted arylsulfonyl; PA1 provided that when X is optionally substituted alkylsulfonyl or optionally …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.