The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 21, 1978
Filed:
Oct. 15, 1976
Aldemaro Ciaperoni, Bollate, IT;
Giuseppe Quaglia, S. Giorgio su Legnano, IT;
Gino Dall'Asta, Milan, IT;
Abstract
A thermostable flameproofing agent for copolyesters is prepared by reacting ne mol of a diester of an alkali dicarboxyaryl sulphonate with 1-2 mols of at least one tetrabrominated diol in the presence of a transesterification catalyst chosen in the group consisting of compounds of Zn, Co, Ca, Sn, Ti and Mn. Copolyester compositions adapted for the preparation of formed bodies are prepared by the polycondensation of a dicarboxylic arylic acid or its diesters and a saturated aliphatic diol with said flameproofing agent and up to 1% by weight of a derivative of phosphorus in the presence of a catalyst consisting of Sb.sub.2 O.sub.3 or GeO.sub.2. Said compositions preferably have an intrinsic viscosity not less than 0.40 dl/g before their transformation into formed bodies and not less than 0.35 dl/g after said transformation.