High molecular weight high density polyethylene with improved tear resistance
CA 2208232 C · Owner: Exxonmobil Chemical Patents, Inc. · Inventors: Best, Steven Arthur; Daniluk, Thomas Samyon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Articles fabricated from certain high molecular weight high density polyethylenes (HMW-HDPE) combined with a second component exhibit superior puncture propagation tear resistance and puncture propagation tear length. The second component may be an elastomer such as styrene-butadiene-styrene, styrene-isoprene-styrene EPR, EPDM, butyl rubber, metallocene-calatyzed polyethylene and combinations, thereof. The second component or components will be present in a fabricated article from 1 to 15 weight percent. Articles include films bags made from films, and extrusion blow-molded articles.
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 12, 1995 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2017.
- 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.