Substitute for amino and phenolic resins
CA 1290085 C · Owner: Markessini, Efthalia Vergopoulo · Inventors: Markessini, Andrew C.; Markessini, Efthalia Vergopoulo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A substitute for amino and phenolic resins is disclosed. It is used in the polycondensation of such resins based on formaldehyde for bonding water penetrable cellulosic particles. The substitute comprises an aqueous solution of, a) either at least one aldehyde together with at least one amide and/or together with at least one phenol or a non-resinous condensation product of formaldehyde and urea, and, b) a sugar or a sugar derivative or their by-products or a starch or its degradation products or a mixture thereof, and/or, c) a raw and/or treated lignosulfonate. This substitute also reduces the free formaldehyde of the resulting board without impairing the other properties thereof.
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 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2008.
- 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.