Preparing polymer dispersion foams
CA 2256030 A1 · Owner: Kolman, Frank · Inventors: Balk, Roelof; Kolman, Frank; Graalmann, Onno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for preparing a polymer dispersion foam L, where:, a) a mixture M which comprises at least one conjugated diene monomer A and at least one ethylenically unsaturated comonomer B is polymerized by free-radical aqueous emulsion polymerization in the presence of at least one emulsifier to give a fine polymer dispersion P, b) the fine polymer dispersion P is pressure-agglomerated to give a coarse polymer dispersion G, c) the polymer dispersion G is concentrated if desired, and is, mixed, if desired, with a reinforcer dispersion H and, d) the dispersion from c) is foamed to give a polymer dispersion foam L, which comprises adjusting the average particle …
Read the whole patent
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
- Filed December 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2020.
- 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.