a polyalkylenepolyamine main chain having pendant substituted 2 - oxo - piperazinyl - triazines attached to the n atoms of the papa main chain are novel compounds which have highly desirable uv - light stabilizing activity coupled with unexpectedly good thermal stability . these compounds , referred to as &# 34 ; pendant piperazinyl triazines &# 34 ; or p for brevity , are used in polymer recipes to formulate a stabilized polymeric composition comprising a light - degradable organic polymer containing an effective amount of a p sufficient to stabilize the polymer . a p is especially effective in a polyolefin in which there is from about 0 . 1 percent by weight , to about 5 % by wt , and is also effective in a wide variety of pastel colored and / or transparent commercially significant polymers .