Patents by Inventor Christina Cron

Christina Cron 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).

  • Patent number: 10435602
    Abstract: The invention relates to hotmelt adhesives based on polyesters, having low VOC and fogging values. In particular, the invention relates to reactive hotmelt adhesives including polyesters containing at least 50 mole percent, based on the polycarboxylic acid components, of terephthalic acid or a derivative thereof and containing at least 40 mole percent, based on the polyol components, of diols of the formula HO—(CH2)x—OH with x?6.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: October 8, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Christina Cron, Gabriele Brenner, Bernhard Schleimer
  • Patent number: 10428193
    Abstract: The invention relates to a process for producing a prepreg based on polyurethane, which is notable for high storage stability at room temperature, a two-stage reaction mechanism, and adjustable adhesion on metal surfaces. It is based on the problem of making the surface tack of the prepregs controllable during processing. The solution is to assemble the PU mixture from which the matrix originates at a later stage such that the glass transition temperature of the thermoplastic polymer is above 30° C. For this purpose, the invention proposes two basically independent but certainly synergistic measures, namely: i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number or mean OH number of which is above 300 mg KOH/g, ii) choice of the proportion of hardener corresponding to the co-binder in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: October 1, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Uwe Stapperfenne, Marina-Elena Schmidt, Tobias Gutmann, Christina Cron, Sandra Reemers
  • Patent number: 10246617
    Abstract: The invention relates to hotmelt adhesives based on polyesters, having low VOC and fogging values. In particular, the invention is directed to a polyester based on polycarboxylic acids and di- or polyols, wherein the polyester including dicarboxylic acids of the formula HOOC—(CH2)x-COOH with x>10 and diols of the formula HO—(CH2)y-OH, with the proviso that at least 50 mole percent of the dicarboxylic acids, based on the total amount of polycarboxylic acid components, and at least 50 mole percent of the diols, based on the total amount of di- or polyols, satisfy the condition x+y>18, in hotmelt adhesives.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: April 2, 2019
    Assignee: EVONIK DEGUSSA GMBH
    Inventors: Christina Cron, Gabriele Brenner, Bernhard Schleimer
  • Patent number: 10245789
    Abstract: The invention relates to a hybrid component part comprising a local stiffening made of a two-stage-crosslinked polyurethane-based fiber composite material, more particularly to the production of such a hybrid component part. Said invention has for its object to specify a technology which makes it possible in cost-effective fashion to effect local stiffening of metal parts with a fiber composite material in order thus to obtain a hybrid component part. It is a fundamental concept of the process according to the present invention to use a particular polyurethane formulation which in a first crosslinking reaction can be converted into a thermoplastic polymer and later in a second crosslinking reaction is fully crosslinked to afford a thermoset matrix material. The thermoplastic polymer is characterized by a good adhesion to metal surfaces. The metal can be subjected to further forming with the attached thermoplastic material.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: April 2, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Christina Cron, Marina-Elena Schmidt, Tobias Gutmann, Uwe Stapperfenne, Sandra Reemers, Leif Ickert
  • Patent number: 10202488
    Abstract: The present invention relates to an isocyanate-free and preferably solvent-free process for preparing polymers containing five-membered cyclic carbonate groups. In particular, the present invention is directed to a process for preparing polymers bearing cyclic carbonate groups by reacting carboxyl-bearing polymers selected from the group including polyesters based on di- or polyols and di- or polycarboxylic acids or derivatives thereof or poly(meth)acrylates, with hydroxyl-functionalized five-membered cyclic carbonates, without addition of isocyanates.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: February 12, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Christina Cron, Gabriele Brenner
  • Publication number: 20180291153
    Abstract: The present invention relates to isocyanate-free polyurethane composition for adhesives, sealants and coating materials. In particular, the present invention relates to isocyanate-free polyurethane composition including polymers (A) carrying cyclic carbonate groups, which do not comprise or are not based on isocyanates, obtained by reaction of polymers which carry carboxyl groups, selected from the group encompassing polyesters based on diols or polyols and on dicarboxylic or polycarboxylic acids and/or derivatives thereof, or poly(meth)acrylates, with five-membered cyclic carbonates that are functionalized with hydroxyl groups, and a curing agent (B) having at least one amino group and at least one further functional group, wherein the further functional group is not an isocyanate group.
    Type: Application
    Filed: June 13, 2016
    Publication date: October 11, 2018
    Inventors: Christina Cron, Gabriele Brenner, Benjamin Schaeffner, Angela Köckritz, Jens Deutsch, Katja Neubauer
  • Patent number: 10087349
    Abstract: A two-pack polyurethane adhesive for semi-structural and structural adhesive bonds which are applied in melt form and have a high handling strength wherein the two-pack polyurethane adhesive includes a first pack A containing at least one polyester A1 which is solid at room temperature and at least one polyol A2 having a hydroxyl group functionality greater than 2.0, and a second pack B containing polyurethane prepolymers having isocyanate groups.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: October 2, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Gabriele Brenner, Birgit Drees, Christina Cron, Kerstin Fuchs
  • Publication number: 20180037786
    Abstract: The invention relates to hotmelt adhesives based on polyesters, having low VOC and fogging values. In particular, the invention relates to reactive hotmelt adhesives including polyesters containing at least 50 mole percent, based on the polycarboxylic acid components, of terephthalic acid or a derivative thereof and containing at least 40 mole percent, based on the polyol components, of diols of the formula HO—(CH2)x—OH with x?6.
    Type: Application
    Filed: February 26, 2016
    Publication date: February 8, 2018
    Inventors: Christina Cron, Gabriele Brenner, Bernhard Schleimer
  • Publication number: 20180030320
    Abstract: The invention relates to hotmelt adhesives based on polyesters, having low VOC and fogging values.
    Type: Application
    Filed: February 26, 2016
    Publication date: February 1, 2018
    Inventors: Christina Cron, Gabriele Brenner, Bernhard Schleimer
  • Publication number: 20170355814
    Abstract: The present invention relates to an isocyanate-free and preferably solvent-free process for preparing polymers containing five-membered cyclic carbonate groups. In particular, the present invention is directed to a process for preparing polymers bearing cyclic carbonate groups by reacting carboxyl-bearing polymers selected from the group including polyesters based on di- or polyols and di- or polycarboxylic acids or derivatives thereof or poly(meth)acrylates, with hydroxyl-functionalized five-membered cyclic carbonates, without addition of isocyanates.
    Type: Application
    Filed: February 1, 2016
    Publication date: December 14, 2017
    Inventors: Christina Cron, Gabriele Brenner
  • Publication number: 20170233622
    Abstract: A two-pack polyurethane adhesive for semi-structural and structural adhesive bonds which are applied in melt form and have a high handling strength wherein the two-pack polyurethane adhesive includes a first pack A containing at least one polyester A1 which is solid at room temperature and at least one polyol A2 having a hydroxyl group functionality greater than 2.0, and a second pack B containing polyurethane prepolymers having isocyanate groups.
    Type: Application
    Filed: August 17, 2015
    Publication date: August 17, 2017
    Inventors: Gabriele Brenner, Birgit Drees, Christina Cron, Kerstin Fuchs
  • Publication number: 20170121476
    Abstract: The invention relates to a process for producing a prepreg based on polyurethane, which is notable for high storage stability at room temperature, a two-stage reaction mechanism, and adjustable adhesion on metal surfaces. It is based on the problem of making the surface tack of the prepregs controllable during processing. The solution is to assemble the PU mixture from which the matrix originates at a later stage such that the glass transition temperature of the thermoplastic polymer is above 30° C. For this purpose, the invention proposes two basically independent but certainly synergistic measures, namely: i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number or mean OH number of which is above 300 mg KOH/g, ii) choice of the proportion of hardener corresponding to the co-binder in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition.
    Type: Application
    Filed: October 28, 2016
    Publication date: May 4, 2017
    Inventors: Uwe Stapperfenne, Marina-Elena Schmidt, Tobias Gutmann, Christina Cron, Sandra Reemers