Impregnating varnish including phenol-resol resin, diphenyl cresyl phosphate, hexamethylenetetramine and a blocked polyetherurethane
CA 1185388 A · Owner: Dynamit Nobel Aktiengesellschaft · Inventors: Franz, Arnold; Kopnick, Siegfried
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 copperlaminated hard paper made of a phenolic resin laminate which is distinguished by reduced punching resistance and stripping resistance. In accordance with the invention increased elasticity of a laminate is obtained by adding 5-20% by weight of a blocked polyetherurethane component from a reaction product of polyethylene glycol poly-, propylene glycol and p-nonylphenol with toluene-2,4-diisocyanate having the following composition: polyethylene glycol 15-20% by weight, polypropylene glycol 50-60% by weight toluene-2,4-diisocyanate 8-12% by weight nonylphenol 10-15% by weight, in the manufacture of a fire resistant laminate based on a …
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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 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 2002.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.