Structured block copolymers
US10005873B2 · kind B2 · utility
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Key dates
| Filing date | Feb 27, 2015 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Feb 27, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F226/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
New polyvinylamide and/or acryl acid-based copolymers. The new structured block copolymers are based on the block copolymerization of N-vinyl formamide (NVF) with other monomers by using a bifunctional initiator. Further, a method of preparing the structured block copolymer is provided, and especially a method wherein the NVF-based block is at least partially hydrolyzed to obtain PVAm. Also the use of the new structured block copolymers in sludge dewatering and in papermaking processes is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.