The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1992
Filed:
May. 01, 1989
Joseph Silbermann, Old Bridge, NJ (US);
Michael T Burchill, Cranbury, NJ (US);
Atochem North America, Philadelphia, PA (US);
Abstract
A surface modified U.V. stabilized article is described which includes a resinous sheet whose sides are both exposed to the air. The surface regions of both sides of the sheet are substantially fully modified in situ with a stabilizing amount of an ingredient such as an ultraviolet light stabilizer material, while the exposed surfaces are substantially free of residual stabilizer and solvent material. The appearance and degree of surface perfection of the modified sides of the sheet are substantially the same as that of an untreated sheet. The U.V. stabilized resin article is made by a continuous process in which the resin body is immersed in a solution of an ultraviolet light stabilizer in a suitable organic solvent, and thereafter, residual stabilizer and solvent are displaced from the modified surfaces in situ. Both steps in the process are carried out in an environment which is non-evaporative of the solvent.