Costabilizers for moulding compositions based on polymers of vinyl chloride
CA 2026034 A1 · Owner: Huls Aktiengesellschaft · Inventors: Hildebrand, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stabilized thermoplastic moulding composition based on halogen-containing polymers, in particular polyvinyl chloride and vinyl chloride copolymers. The stabilizer system contains as primary stabilizers zinc compounds of the formula R1O-Zn-OR2, wherein R1 and R2 represent for example, aliphatic acyl groups, having 8 to 21 carbon atoms and at least one polymeric primary stabilizer from the group of polyoxazolines. The costabilizers according to the invention are at least two compounds selected from the group of pyrroles, dihydropyridines copolymers of oxa-, zolines and bisoxazoles and optionally, polyols. The moulding, compositions according to the invention show better heat stability than …
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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 September 24, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2012.
- 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
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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.