Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts
T994004 Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts
Patent Drawings:

Inventor: Shawl
Date Issued: May 6, 1980
Application: 06/069,005
Filed: August 23, 1979
Inventors: Shawl; Edward T. (Wallingford, PA)
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 560/24; 560/25
Field Of Search:
International Class:
U.S Patent Documents:
Foreign Patent Documents:
Other References:









Abstract: Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of strongly acidic sulfonated aromatic ion exchange resins or perfluoroalkane sulfonic acid resins, at temperatures of from ambient to about 150.degree. C. and optionally in the presence of an inert solvent.
Claim:
Description:
 
 
  Recently Added Patents
Account and customer creation in an on-line banking model
Resistive memory element sensing using averaging
Data center management unit with improved disaster prevention and recovery
Controlling transmission resources in mobile radio systems with dualtransfer mode
Wind farm, wind power plant in a wind farm and operating control for this purpose
Three-dimensional holographic display using active shutter
System and method for distributed security
  Randomly Featured Patents
Method and apparatus for lossless beam shaping to obtain high-contrast imaging in photon tunneling methods
Method and device to determine the passing to a pre-selected distance of a reflector point by means of the time of propagation of a continuous wave
Locking mechanism for an elevator car door
Cam track mount for sunroof
Skinning apparatus
Method for applying a narrow web zipper transverse to the film direction
Bed lighting apparatus
Body cover cape
Glove pair
Fermentative carotenoid production