Self-extinguishing and thermostable copolyesters and process for making the same
CA 1111187 A · Owner: Snia Viscosa, Societa Nazionale Industria Applicazioni Viscosa S.P.A. · Inventors: Dall'Asta, Gino; Quaglia, Giuseppe; Ciaperoni, Aldemaro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Self-extinquishing and thermostable copolyester compositions are obtained by polycondensing in the, presence of a polycondensation catalyst the following, components: A) a compound selected from the group consisting of dicarboxylic arylic acids and their methyl diesters; B) a saturated aliphatic diol; C) a tetrabrominated diol having the formula:, wherein a and b are, independently of one another 1 or 2;, D) a sulphonated compound having the formula: wherein the radicals R' represent hydrogen atoms alkyl radicals, containing from 1 to 3 carbon atoms or hydroxyalkyl radicals, containing 2 or 3 carbon atoms and M is an alkali metal atom;, and E) up to 1% by weight of a phosphorus derivative …
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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 October 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 1998.
- 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.