Process for producing porous, low-skin pvc resin
CA 1338652 C · Owner: Hawrylko, Roman Bohdan · Inventors: Hawrylko, Roman Bohdan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An agitated aqueous suspension process for producing porous, low-skin, agglomerated polyvinyl chloride resin particles comprises polymerizing vinyl monomer in the presence of a dispersant system consisting essentially of (a) from about 0.01 to about 0.03 part by weight per 100 parts by weight monomer of an unneutralized ion sensitive primary dispersant capable of thickening water, and (b) from about 0.1 to about 0.4 part by weight per 100 parts by weight monomer of a secondary dispersant; the low-skin product offers advantages such as faster uptake of plasticizer for a given porosity, and provides a purer product.
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
- Granted October 15, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2013.
- 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.