Coating and molding compositions containing alkyl vinyl ether polymers and use thereof as leveling agents or antifoam agents
CA 2008077 C · Owner: Bubat, Alfred · Inventors: Haubennestel, Karlheinz; Bubat, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Coating compositions and molding compositions containing an amount of alkyl vinyl ether polymer which is effective for improving leveling and/or preventing or eliminating foam, and the use of these copolymers for improving leveling and/or preventing or eliminating foam in coating compositions and molding compositions. The alkyl vinyl ether polymer is a copolymer containing identical or different repeating units of the formula (see fig I), in which R represents a C1-18-alkyl group or C m F2m+1-(CH2)2z- group where m is a number from 4 to 18, and identical or different repeating units of the formula (see fig II), in which R' represents various groups.
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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
- Filed January 18, 1990 and granted June 8, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2012.
- 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.