Continuous process for making polymers having pendant azlactone or macromolecular moieties
CA 1265892 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Engler, David A.; Maistrovich, Anthony R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A bulk polymerization process for free radical polymerization of vinyl monomers and alkenyl azlactones or macromolecular monomers (e.g. functionalized polystyrene) in a wiped surfacereactor is disclosed. Referring to Figure 1; monomer streams 5 (after purification and silica gel column 2), and 7 and macromer or azlactone 8 are combined with free radical initiator 9 to form a premix 16. Pump 18 transfers the premix stream 22 through static mixer 24 into a wiped surface reactor 27. The reactor can be a counter rotating twin screw extruder which produces polymer stream 36 without the need of solvent and using residence times much shorter than prior art solution or …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 13, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.