WILLIAM STEPHEN WIGGINS, JR
Pilots at Ashford Rd, Mobile, AL
License number
Alabama A2054089
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
767 Ashford Rd, Mobile, AL 36608
Professional information
One-Pot Process For The Preparation Of 5-Sulfonyl-Substituted Benzotriazoles Uv Absorbers
US Patent:
6040455, Mar 21, 2000
Filed:
Jan 21, 1999
Appl. No.:
9/234879
Inventors:
Mervin G. Wood - Poughquag NY
William Wiggins - Mobile AL
Catherine Blake - Saraland AL
Albert Carpenter - Mobile AL
Wha Chen - Freemont CA
William Wiggins - Mobile AL
Catherine Blake - Saraland AL
Albert Carpenter - Mobile AL
Wha Chen - Freemont CA
Assignee:
Ciba Specialty Chemicals Corporation - Tarrytown NY
International Classification:
C07D24920
US Classification:
548259
Abstract:
5-Sulfonyl substituted benzotriazole UV absorbers are prepared from the corresponding 5-chlorobenzotriazole in a two step, but one-pot process where the second step involves the oxidation of the non-isolated 5-thio substituted benzotriazole using sodium tungstate, hydrogen peroxide and formic acid. The 5-sulfonyl substituted benzotriazoles exhibit enhanced absorption in the near-visible range (over 350 nm) thus providing effective protection to substrates in this critical area of the spectrum.