Preparation of block polymers using polyazo sequential free radical initiators
US4075286A · kind A · utility
10Cited by
3References
4Claims
0Family size
Assignee
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Key dates
| Filing date | May 30, 1974 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | May 30, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a block polymer by first forming a polymer having azo functions by reacting vinyl polymer and a polyazo compound under conditions so that one of the azo functions rupture leaving the other azo function in tact; then, vinyl monomer is reacted with the polymer to produce the block copolymer. The polyazo compounds must contain at least one alkyl or aryl thio or oxa group alpha to at least one of the azo groups in the connecting chain between the azo groups to be useful as the sequential generator of free radicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.