Gradient polymers of two or more cyclic, organic, ring-opening, addition polymerizable monomers and methods for making same
US4195167A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Nov 9, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G85/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polymers which comprise polymer chains along which the proportion of mer units provided by a first heterocyclic monomer gradually increases in a given chain length as the proportion of mer units provided by a second heterocyclic monomer gradually decreases along said chain length. In one form, the portions of the polymers adjacent one end of the given chain lengths have about 100% of mer units provided by the first monomer and about 0% of mer units provided by the second monomer and the portions adjacent the other end of the given chain lengths have about 0% of mer units provided by the first monomer and about 100% of mer units provided by the second monomer. Additional forms of polymers are disclosed. Process for producing such polymers comprising introducing at least one primarily polymerizable feed composition comprising at least one of the monomers described above from at least one primary feed source to a polymerization zone, the primary polymerizable feed composition continually varying in compositional content of the monomers therein during said continuous introduction; simultaneously adding to primary feed source at least one different secondary polymerizable feed compositi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.