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:
Dec. 08, 1998
Filed:
Apr. 10, 1997
Neil Dunski, St. Louis County, MO (US);
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
A stabilizing system for stabilizing polymeric materials against ultraviolet light and thermooxidative deterioration is provided in which the stabilizing system is in pellet form. The pellet is formed from a substantially dry homogeneous mixture of at least one stabilizer and an agent which will prevent melting of the stabilizer. The stabilizer compound makes up about 50% to about 98% by weight of the mixture. The stabilizers are antioxidants (such as phosphites and hindered phenols) or hindered amine UV light stabilizers, or combinations thereof. The melt preventing agent may be a compound derived from a fatty acid or a fatty alcohol, or a fatty acid or a fatty alcohol, or a combination of fatty acids or fatty alcohols which makes up about 3%-10% of the homogeneous mixture. The fatty acids, fatty alcohols, and the compounds derived therefrom preferably have a low melting point in the range of 50.degree.-100.degree. C. and preferably between 50.degree. C. and about 80.degree. C. The melt preventing agent may alternatively be a lubricating agent having a small particle size (e.g., less than 100 .mu.) which makes up about 2-50% by weight of the homogeneous mixture.