Process for the preparation of blown film and oriented film
CA 1249704 A · Owner: Stamicarbon B.V. (Licensing Subsidiary Of Dsm) · Inventors: Van Der Molen, Theodorus J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Blown film on the basis of low-density polyethylene is prepared by extruding the molten polymer at melt temperatures at the die gap of below 135 °C. Films that have been prepared this way have special orientation as a result of which good mechanical and optical properties are present. Oriented films are determined by X-ray diffraction analysis and have an intensity ratio of the 110 reflection band at least, 20, and an angle a between the average orientation direction of the polymer molecules and the film extrusion direction of at most 20°.
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 February 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2006.
- 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.