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
Motor assembly
Epitaxial substrate for electronic device, in which current flows in lateral direction and method of producing the same
Vending machine
Verification of a portable consumer device in an offline environment
Imaging device and imaging method
Using location based services for determining a calling window
High brightness laser diode module
  Randomly Featured Patents
Therapeutic bed with vibrating element
Steering shaft assembly for automotive vehicles
Method and apparatus for selectably providing single-ended and differential signaling with controllable impedance and transition time
Phase change memory devices and methods for fabricating the same
Voice storage device and incoming call answering system
Automobile and/or replica thereof
Hearing aid to be worn behind the ear having battery and volume control facing in opposite directions
Automotive onboard fire suppression system reservoir with pressure-configurable orifices
Fluid flow switch sensing device having a test button
Spacing retainer including locking means for reinforcements