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:
Jun. 29, 1999
Filed:
Jul. 09, 1997
Hanns-Jorg Liedloff, Domat/Ems, CH;
EMS-Inventa AG, Zurich, CH;
Abstract
The invention is relative to weather-resistant polyamides and to methods of their production in which the polymerization or polycondensation of the polyamide-forming monomers (I) is carried out in the presence of 0.02 to 0.7% by weight 4-amino-2,2,6,6-tetraalkylpiperdine (II), 0 to 0.5% by weight of an aliphatic or cycloaliphatic diamine (III) carrying a primary and a tertiary amino group and 0.02 to 0.7% by weight of a 2,6-dialkylphenol (IV) functionalized in 4-position to the OH group and with the formula ##STR1## in which R.sup.1 and R.sup.2 are the same or different alkyl groups with 1 to 6 C atoms, R.sup.3 is either a hydrogen atom or a methyl group, functional group A represents either a free carboxyl group or a carboxyl group esterified with C.sub.1 -C.sub.4 alcohols or represents a primary amino group, in the case of the amino group the value combinations (x=2/y=1); (x=2/y=0); (x=1/y=0) and (x=0/y=1) are possible for x and y and in the case of the free or esterified carboxyl group x and y can additionally each be 0,