Patents Assigned to Cobarr S.p.A.
  • Continuous process for solid phase polymerisation of polyesters
    Patent number: 8293850
    Abstract: A process for the solid phase continuous polymerization of polyester in order to achieve a molecular weight increase, measurable by the intrinsic viscosity IV increase of the polyester, wherein the use of at least a reactor (15) is provided, the reactor (15) being cylindrical, rotary around its own central axis (S), substantially horizontal, slightly inclined so as to produce the polymerization of the polyester granules passing through the reactor by gravity thanks to the inclination and the rotation of the reactor (15), inside the reactor there being produced a purge gas flow having the same or the opposite direction with respect to the flow of the polyester granules.
    Type: Grant
    Filed: July 3, 2003
    Date of Patent: October 23, 2012
    Assignee: Cobarr S.p.A.
    Inventor: Giuliano Cavaglia
  • Transparent polyester resins and articles therefrom
    Patent number: 7048981
    Abstract: Compositions suitable for preparing transparent articles comprising an aromatic polyester resin selected from a copolyalkylene terephthalate containing from 3 to 15% by moles of units derived from isophtalic acid and/or a naphtalene dicarboxylic acid and a polyxylylene amide, preferably poly (m.xylylene adipamide), in which the polymide is dispersed in the polyester resin as domains with average numeral size of 30 to 200 nm. The compositions are obtained by premelt-mixing the polyester with a dianhydride of a tetracarboxylic acid prior mixing the polyxylylene amide using melt viscosity ration between the polyester resin and the polyxylylene amide higher that 1.5:1, preferably from 3:1 to 8:1.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: May 23, 2006
    Assignee: Cobarr S.p.A.
    Inventors: Hussain Al Ghatta, Sandro Cobror
  • Method for the reduction of impurities in polyester resins
    Patent number: 5049647
    Abstract: A method for purifying polyethyleneterephthalate reins by contacting the resins with an atmosphere containing carbon dioxide under supercritical conditions.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: September 17, 1991
    Assignee: Cobarr S.p.A.
    Inventor: Hussain A. Al-Ghatta
  • Method of treating hollow articles, in particular polyethylene terephthalate preforms
    Patent number: 4764323
    Abstract: A method of treating PET preforms and bottles consists of subjecting the preforms or the bottles to a carbon dioxide atmosphere at a higher temperature than the critical temperature of carbon dioxide, a higher pressure than ambient pressure, and for a set time period. The treatment reduces the acetaldehyde concentration in the head of the treated bottles or in the bottles obtained from the treated preforms by stretch-blowing, and also reduces the permeability of gases through the bottle walls.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: August 16, 1988
    Assignee: Cobarr S.p.A.
    Inventor: Hussain A. Al Ghatta