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:
Nov. 01, 1988
Filed:
Apr. 10, 1987
Ramanathan Ravichandran, Yonkers, NY (US);
Ambelal R Patel, Ardsley, NY (US);
Frank P Cortolano, Valhalla, NY (US);
Richard W Thomas, Nutley, NJ (US);
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Long chain N,N-dialkylhydroxylamines represent particularly valuable stabilizers for a number of polymer substrates. Their particular value is seen in their high temperature processing stabilization of poly(arylene sulfide), such as poly(phenylene sulfide), PPS, and of selected unsaturated elastomers used to modify thermoplastics. PPS is processed at elevated temperatures (300.degree. to 425.degree. C.) at which temperatures it crosslinks readily. Process stabilizers can extend the time to crosslinking and hence the processibility of the PPS. Long chain N,N-dialkylhydroxylamines are very effective process stabilizers for PPS being far superior to phenolic antioxidants, phosphites or amines. The hydroxylamine derived from di(hydrogenated tallow)amine is particularly useful for this purpose.