Films for packaging low-viscosity rubbers
CA 2055787 A1 · Owner: Heeren, Wolfgang · Inventors: Heeren, Wolfgang; Ostendorf, Manfred; Breuker, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film prepared from a thermoplastic moulding composition comprising a mixture of components 1 and 2 wherein component 1, is a high-impact graft copolymer containing from 95 to 85 % of a vinylaromatic and from 5 to 15 % of a 1,3-diene and component 2, is a linear or radial block copolymer containing from 25 to 45 % of a vinylaromatic and from 75 to 55 % of a 1,3-diene and, component 1 makes up from 55 to 70 % of the mixture. The film has significantly improved tensile strength high elasticity, excellent solubility in monomeric vinylaromatics low gel content and good weldability and is suitable for packaging low-viscosity rubbers, in particular those used as impact-modifiers for …
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 November 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 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.