Polyolefin stabilization
AssigneePhillips Petroleum Company
InventorJames C. Leininger
Life of this patent
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Abstract
Homopolymers and copolymers of 1-olefins are protected against the deleterious effects of oxygen, heat and ultraviolet light by incorporating therein an additive system comprising a hindered amine component and a metal phosphonate component, optionally, containing a phenolic antioxidant, an organic phosphite, a lubricant and pigments in an amount sufficient to prevent such deterioration.
Claims20
A stabilized polymeric composition comprising a major amount of a polymer of a mono-1-olefin having incorporated therein a small, but effective, stabilizing amount, sufficient to stabilize said composition against the deteriorative action of oxygen, heat and ultraviolet light, of
- (a) at least one hindered amine represented by the formula ##STR3## where R, R.sub.1, R.sub.2 are the same or different and each is an alkyl group having from 1 to 6 carbon atoms such as methyl, n-propyl, n-butyl, t-butyl, t-pentyl, t-hexyl, R.sub.3 is an alkyl group having from 1 to 12 carbon atoms, and n is an integer of 1 to 4 and
- (b) at least one metal phosphonate represented by the formula ##STR4## where R is as before, R.sub.4 is hydrogen or alkyl having from 1 to 6 carbon atoms, R.sub.5 is an alkylene radical having from 1 to 4 carbon atoms, R.sub.6 is hydrogen or alkyl having from 1 to 30 carbon atoms, M is a metal selected from among aluminum, barium, cadmium, calcium, chromium, cobalt, nickel, sodium, tin, and zinc and m is 1, 2 or 3.
A stabilizer system for polymers comprising a mixture of
- (a) at least one hindered amine represented by the formula ##STR5## where R, R.sub.1, R.sub.2 are the same or different and each is an alkyl group having from 1 to 6 carbon atoms such as methyl, n-propyl, n-butyl, t-butyl, t-pentyl, t-hexyl, R.sub.3 is an alkyl group having from 1 to 12 carbon atoms, and n is an integer of 1 to 4 and
- (b) at least one metal phosphonate represented by the formula ##STR6## where R is as before, R.sub.4 is hydrogen or alkyl having from 1 to 6 carbon atoms, R.sub.5 is an alkylene radical having from 1 to 4 carbon atoms, R.sub.6 is hydrogen or alkyl having from 1 to 30 carbon atoms, M is a metal selected from among aluminum, barium, cadmium, calcium, chromium, cobalt, nickel, sodium, tin, and zinc and m is 1, 2 or 3.
Dependencies are inferred from the claim text.