Piperidine derivatives and their use as stabilizers

A synthetic polymer composition stabilized against photo- and thermal-deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, a compound having the formula ##SPC56##

• wherein
• R' is alkyl;
• X and Y represent oxygen;
• Z represents a group of the formula >N-R'"
• in which R'" is hydrogen;
• n is 1, and
• R is alkyl.

A synthetic polymer composition stabilized against photo- and thermal-deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, a compound having the formula ##SPC57##

• wherein
• R' represents an alkyl group, an alkenyl group, an aralkyl group, an acyloxyalkyl group, a hydroxyalkyl group or an epoxyalkyl group;
• X and Y represent oxygen;
• Z represents a group of the formula >N-R'"
• in which R'" is a hydrogen atom or an alkyl group;
• n is 1, and
• R represents an alkyl group, an alkenyl group, an aralkyl group, an acyloxyalkyl group or an epoxyalkyl group.

A synthetic polymer composition stabilized against photo- and thermal-deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, a compound having the formula ##SPC58##

• wherein
• R' represents an alkyl group, a substituted alkyl group, an acyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, an amino group, a substituted amino group or
• nitroso group;
• X and Y represent oxygen;
• Z represents a group of the formula >N-R'" in which R'" is hydrogen atom, an alkyl group or a substituted alkyl group;
• n is an integer of 1 through 4 inclusive;
• and
• R represents, when n is 1, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, a cycloalkyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, a substituted phosphino group or a substituted phosphinyl group,
• when n is 2, an alkylene group, an alkenylene group, an arylene group, a substituted arylene group, an aralkylene group, an alkylenediphenylene group, a bis-(acyloxyalkylene) group, an alkylene-bis-(oxycarbonylalkyl) group, a dialkylene ether group or a diphenylene ether group,
• when n is 3, an alkanetriyl group, a tris-(acyloxyalkylene) group, an alkane-tris-(oxycarbonylalkyl) group or a group of the group ##SPC59##
• in which
• p is an integer of 1 through 8 inclusive and p's may be the same or different, and,
• when n is 4, an alkane tetrayl group, a tetrakis-(acyloxyalkylene) group or an alkanetetrakis(oxycarbonylalkyl) group.

A synthetic polymer composition stabilized against photo- and thermal-deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, a compound having the formula ##SPC69##

• wherein
• R' represents an alkyl group, an alkenyl group, an aralkyl group, an acyloxyalkyl group, a hydroxyalkyl group or an epoxyalkyl group;
• X and Y represent oxygen;
• Z represents a group of the formula >N--R'" in which R'" is hydrogen atom or an alkyl group;
• n is 2, and
• R represents an alkylene group, a group of the formula ##SPC70##
• or a group of the formula --(CH.sub.2).sub.p --O--(CH.sub.2).sub.p --
• in which p is an integer of 1 through 8 inclusive.