Manufacture of high molecular weight poly(vinylamines)
CA 1315914 C · Owner: Lai, Ta-Wang · Inventors: Lai, Ta-Wang; Vijayendran, Bheema R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The inverse emulsion polymerization of a monomer of the formula wherein R and R1 represent hydrogen or a C1-C4 alkyl group using a, surfactant system having a hydrophilic-lipophilic halance value from 4 to 9, an azo-type free radical initiator and certaln hydrocarbon liquids to yield a water-in-oil emulsion of a homopolymer of at least 106 average molecular weight, the emulsion having a viscosity less than 10 cps, at 15% solids, 60 rpm Brookfield and 20°C. Also disclosed is the preparation of poly(vinylamines) of at least 106 average molecular weight by acid or base hydrolys,is of the homopolymer emulsion. Also disclosed are drilling mud compositions cements for drilling. holes completion …
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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 April 6, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 6, 2010.
- 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.