Selective cyclization of block copolymers
US4248986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1979 |
| Grant date | Feb 3, 1981 |
| Priority date | — |
| Expiry date | Aug 27, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/48
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for selectively cyclizing block polymers which comprises reacting 1 to 30 percent by weight solution of a block copolymer comprised of at least two different blocks, at least one of which blocks is a cyclizable block derived from a conjugated diene monomer of the general structure ##STR1## wherein: R.sub.1 is selected from a hydrocarbyl group containing one to twelve carbon atoms, R.sub.2 is selected from hydrogen or a hydrocarbyl group containing one to twelve carbon atoms; and at least one of which blocks is a non-cyclizable block derived from at least one member selected from the following classes of compounds: PA1 (a) polymers of conjugated diene monomers of general structure ##STR2## wherein: R.sub.3, R.sub.4 and R.sub.5 are the same or different and are selected from hydrogen or a hydrocarbyl group containing one to twelve carbon atoms; R.sub.6 is selected from hydrogen, a hydrocarbyl group containing one to twelve carbon atoms or a cyano group, PA1 (b) polymers of .alpha.-methylstyrene, styrene, alkyl or aryl substituted styrenes or halogen substituted styrenes, PA1 (c) polymethacrylonitrile, polycaprolactam, polycaprolactone or polydimethylsilox…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.