Low molecular weight polymers and copolymers
US4680354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1986 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | May 21, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New Cobalt(II) nitrilomethylidyne dipyrrole complexes such as Cobalt(II) 2,2'-[trimethylenebis(nitrilomethylidyne)]-dipyrrole, Cobalt(II) 2,2'-[o-phenylenebis(nitrilomethylidyne)]-dipyrrole and their basic ligand complexes are effective catalysts for molecular weight control in acrylate/methacrylate polymerization. The process comprises polymerizing monomers, especially including methacrylic monomer or methacrylic/acrylic monomer, in the presence of azo initiator and between 0.0001% and 0.01% of Cobalt(II) 2,2'-[trimethylenebis(nitrilomethylidyne)]-dipyrrole and/or Cobalt(II) 2,2'-[o-phenylenebis(nitrilomethylidyne)]-dipyrrole complexes to produce low molecular weight acrylate polymers and copolymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.