Preparing laminated thermoplastics stabilized with bisbenzophenones

U.S. Patent Number: 5306456

Abstract: Thermoplastic articles, preferably of polycarbonate, are advantageously stabilized by selected bisbenzophenone UV absorbers concentrated in the outer surface or coating layers of the article prepared by coextrusion techniques.

Inventors: Suhadolnik; Joseph (Yorktown Heights, NY); Botkin; James H. (Passaic, NJ); Hendricks; Carmen (White Plains, NY)

Assignee: Ciba-Geigy Corporation (Ardsley, NY)

Application Number: 08/029,211

Issued: 1994-04-26

Expired: 2006-04-26

Classes: 264/173.16 ; 264/173.19; 264/174.1; 264/211; 425/131.1; 425/133.5; 425/462; 428/412

Field of search: 264/171,211 425/131.1,133.5,462 428/412

Click the image above to view patent images at uspto.gov within a frame.

Click here for the fulltext page on uspto.gov within a frame.