Patents by Inventor Inna Bechthold

Inna Bechthold has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing melt-stable homo- and copolyesters of cyclic esters and/or diesters
    Publication number: 20050165206
    Abstract: In a method for producing a homopolyester or copolyester obtainable from at least one cyclic monomer, the at least one cyclic monomer is polymerized in the presence of an initiator. The initiator is selected from organo-tin compounds, tin carboxylates, and tin alkoxides of the oxidation state II or IV that may contain optionally hydroxy groups. At the latest at a point in time when a desired degree of polymerization is reached, a phosphinic acid and/or a phosphinic derivative of the formula (R1)(R2)P(?O)X is added, wherein R1 and R2 each are independently of one another hydrogen, alkyl, aryl, or hetero aryl, and X is —OR3 or —NR1R2, wherein R3 is hydrogen, alkyl, aryl, MI or ½MII and MI is an alkali metal ion and MII is an alkaline earth metal ion and wherein the substituents R1 and R2 have the meaning indicated above.
    Type: Application
    Filed: April 11, 2003
    Publication date: July 28, 2005
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Gerald Rafler, Inna Bechthold, Horst Riekert
  • Process for manufacturing homo- and copolyesters of Lactic acid
    Patent number: 6657042
    Abstract: A process is provided for manufacturing homo- and copolyesters of lactic acid by ring scission polymerization of its cyclic monomers in the presence of an initiator. Polymerization is carried out in the molten phase in the presence of an initiator system containing a compound of tin and at least one additional initiator chosen from the compounds of metal of the fourth subgroup.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: December 2, 2003
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Gerald Rafier, Jacqueline Lang, Monika Jobmann, Inna Bechthold
  • Process for manufacturing homo- and copolyesters of lactic acid
    Publication number: 20030060595
    Abstract: A process is provided for manufacturing homo- and copolyesters of lactic acid by ring scission polymerization of its cyclic monomers in the presence of an initiator. Polymerization is carried out in the molten phase in the presence of an initiator system containing a compound of tin and at least one additional initiator chosen from the compounds of metal of the fourth subgroup.
    Type: Application
    Filed: March 19, 2002
    Publication date: March 27, 2003
    Inventors: Gerald Rafler, Jacqueline Lang, Monika Jobmann, Inna Bechthold