Structure of polyacetal resin composition and process for producing the same
CA 2072353 A1 · Owner: Polyplastics Co. Ltd. · Inventors: Miyawaki, Keiichi; Sano, Hiroyuki; Tajima, Yoshihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a structure of a polyacetal resin composition which further comprises a polyolefin resin to form a dispersion of an interpenetrating network structure so as to achieve excellent acid resistance, fusibility with the polyolefin resin and mechanical properties. In the melt-kneading of the polyacetal resin A as the matrix with the polyolefin resin B, a filler C having a surface tension which is at least higher than that of the component B at the melt-kneading temperature and an average particle diameter of 0.05 to 50 µm is meltkneaded in an amount satisfying the following formulae (1) and (2):, B/(A+B) = 0.05 to 0.5 (weight ratio) (1) C/(B+C) = 0.1 to 0.7 (weight …
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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 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2014.
- 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.