2,2,6,6-Tetramethyl piperidyl-4-phosphites as stabilizers for organic polymeric materials

2,2,6,6-tetramethyl-piperidyl-4-phosphites having the formula:

• ##STR92## wherein:
• R.sub.1 is selected from the group consisting of:
• ##STR93## R.sub.2, R.sub.3 and R.sub.4 are selected from the group consisting of:
• ##STR94## hydrogen, alkyl having from 1 to about 20 carbon atoms;
• aryl and hydroxylaryl having from 6 to about 20 carbon atoms;
• alkyl aryl and aryl alkyl having from 7 to about 20 carbon atoms;
• hydroxyalkyl and hydroxyalkylene oxyalkylene having from 2 to about 30 carbon atoms;
• and R.sub.1 and R.sub.2 ;
• and R.sub.3 and R.sub.4 ;
• taken together to form ##STR95## R is selected from the group consisting of hydrogen and ##STR96## R.sub.6 is alkyl having from 1 to about 6 carbon atoms;
• Y is selected from the group consisting of hydrogen and oxygen;
• m is a number selected from 0, 1, 2, 3 and 4;
• n is a number selected from zero to 20, when n is zero, at least one of R.sub.2 and R.sub.3 being derived from a polyol or a polyphenol;
• and
• Z is selected from the group consisting of bivalent, trivalent and tetravalent alkylene having from 2 to about 30 carbon atoms;
• bivalent, trivalent and tetravalent arylene, bis arylene and tris, arylene, having from 6 to about 30 carbon atoms;
• mono, di or tri N-substituted cyanuric acid;
• and taken with OR, R.sub.1 or R.sub.2 and R.sub.3 or R.sub.4 to form the group:
• ##STR97## in which Z.sub.1 is selected from the group consisting of ##STR98##