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
Side portion of a circular saw blade
3D IC method and device
Spread spectrum communication system and transmission power control method therefor
Antenna arrangement and antenna housing
Display apparatus having a semi-penetration layer and a sealing unit
Selecting modulation and coding scheme in the presence of interference
Selection of hash lookup keys for efficient retrieval
  Randomly Featured Patents
Receiver capable of enhancing receiving efficiency in a code division multiple access communication system
Method and apparatus for increasing the effectiveness of system debug and analysis
Plasma processing method
Structure of a wire winding box
Icon for a portion of a display screen
.beta.-keto amide modified epoxy resins
Hot start open nozzle fuel injection systems
Oscillation generator providing oscillations of varying amplitude
Multiphase clock generation circuit
Housing for a navigation light