Impact resistant methacrylic resin composition
CA 1266337 C · Owner: Mitsubishi Rayon Company Ltd. · Inventors: Tateyama, Masamitsu; Sato, Fumio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Impact Resistant Methacrylic Resin Composition Abstract, An impact resistant methacrylic resin composition having improved transparency, weatherability and impact resistance comprising a multi-layer graft copolymer and a methacrylic resin is disclosed. The multi-layer graft copolymer is prepared through 3 step polymerizations as follows: in the first step a, semi-soft copolymer is prepared by polymerizing specific amounts of an alkyl methacrylate having an alkyl group with 1 to 4 carbon atoms, styrene and/or a styrene derivative, an alkyl acrylate having an alkyl group with 1 to 8 carbon atoms and a specific polyfunctional monomer; in the second step, a soft copolymer containing alkyl …
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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
- Granted February 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 27, 2007.
- 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.