Patents by Inventor Manfred Kreczinski

Manfred Kreczinski 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).

  • Multistage continuous preparation of cycloaliphatic diisocyanates
    Publication number: 20050043561
    Abstract: A process for continuous phosgene-free preparation of cycloaliphatic diisocyanates.
    Type: Application
    Filed: August 13, 2004
    Publication date: February 24, 2005
    Applicant: DEGUSSA AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Elm, Hans-Werner Michalczak
  • Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates based on isophorone diisocyanate
    Publication number: 20040176562
    Abstract: Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates from isophorone diisocyanate, in which the partial trimerization is carried out over a period of from 2 minutes to 30 minutes in the presence of from 0.05 to 1.
    Type: Application
    Filed: March 5, 2004
    Publication date: September 9, 2004
    Applicant: DEGUSSA AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Elm
  • Preparation of low-odor-storage-stable monomer-containing polyisocyanurates based on isophorone diisocyante
    Patent number: 6703471
    Abstract: Low-odor, storage-stable monomer-containing polyisocyanurate is prepared from isophorone diisocyanate by conducting a partial trimerization for 3 minutes to 3 hours in the presence of 0.05-2% by weight of a catalyst, based on the weight of the diisocyanate, the catalyst having the formula [R—NX3]m⊕mY⊖ wherein Y⊖ is a carboxylic acid anion of 4-8 carbons, R is a &bgr;-hydroxyalkyl group of 2-6 carbons, X is an alkylene group of 2-3 carbons and m is a number from 1.0 to 2.0. The three radicals X form a ring with the quaternary nitrogen by way of a common nitrogen atom, which may be partly &bgr;-hydroxyalkylated, said ring optionally having an OH group positioned &agr;, &bgr; or &ggr; to the nitrogen. The reaction proceeds at a temperature of 0-160° C.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: March 9, 2004
    Assignee: Degussa AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Lomölder
  • Preparation of low-odor-storage-stable monomer-containing polyisocyanurates based on isophorone diisocyante
    Publication number: 20030009054
    Abstract: Low-odor, storage-stable monomer-containing polyisocyanurate is prepared from isophorone diisocyanate by conducting a partial trimerization for 3 minutes to 3 hours in the presence of 0.
    Type: Application
    Filed: June 27, 2002
    Publication date: January 9, 2003
    Applicant: DEGUSSA AG
    Inventors: Stephan Kohlstruk, Manfred Kreczinski, Rainer Lomoelder