Method of making broader molecular weight distribution polystyrene
CA 1072244 A · Owner: Arco Polymers · Inventors: Wright, Harold A.; Ingram, Alvin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
References Applied, United States Patent 2,912,418 Nov. 10, 1959 Cl. 260-86.1 Johnson et al Chemical Abstract, 54(1960) page 14158(b) The above cited patent discloses and claims a process for polymerizing a monomer such as styrene in the presence of an oil-soluble free-, radical-generating initiator such as benyoyl peroxide which comprises adding to the styrene a non-conjugated diolefinic compound such as allyl methacrylate. Example II in column 4 of the Patent specifically discloses such a process of polymerizing styrene with allyl methacrylate in the presence of benyoyl peroxide. The cited Chemical Abstract reference discloses a copolymer of styrene with allylstyrene. Applicant's claims 1 …
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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 19, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 1997.
- 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.