Impact polymer blend
CA 2057471 A1 · Owner: Union Carbide Chemicals And Plastics Company Inc. · Inventors: Ficker, Harold K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention A blend comprising:, (a) an isotactic polypropylene matrix containing an ethylene/propylene copolymer dispersed phase, said combination having dual melting peaks a, first peak in the range of about 150°C to about 165°C, attributable to the matrix, and a second peak in the range of about 123°C to about 132°C having at least about 2.2 calories per gram melting endotherm attributable to the copolymer, component (a) being present in the blend in an amount of about 60 to about 90 percent by weight based on the weight of the blend; and, (b) an ethylane/l-butene copolymer containing about 85 to about 90 percent by weight ethylene; having a density in the range of about …
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 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.