Phenolic phosphites as stabilizers for polymers
AssigneeThe Goodyear Tire & Rubber Company
InventorFarris H. Wilson, Jr.
Life of this patent
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Abstract
Polymers subject to oxidative degradation are stabilized by incorporating therein phosphite stabilizers such as the reaction product obtained by reacting a mixture of triphenylphosphite and 2,6-di-t-butyl-4-hydroxymethyl phenol or the reaction product obtained by reacting a mixture of triphenyl phosphite, 2,6-di-t-butyl phenol and paraformaldehyde.
Claims8
A composition prepared by reacting a combination comprising (A) a triaryl phosphite having the following structural formula ##STR11## wherein R, R.sup.1 and R.sup.2 are selected from the group consisting of phenyl and substituted phenyl wherein the substituted phenyl contains one or two substituents selected from the group consisting of alkyl radicals containing 1 to 20 carbon atoms, alkylthio radicals containing 1 to 20 carbon atoms, chloro and aralkyl radicals having 7 to 20 carbon atoms, and (B) a hydroxy alkyl phenol having the following structural formula ##STR12## wherein R.sup.3, R.sup.4 and R.sup.5 are selected from the group consisting of hydrogen, alkyl radicals having 1 to 12 carbon atoms, cycloalkyl radicals having 5 to 12 carbon atoms, aralkyl radicals having 6 to 12 carbon atoms and ##STR13## with at least one of R.sup.3, R.sup.4 and R.sup.5 being ##STR14## and wherein at least one of R.sup.3 and R.sup.4 is a tertiary alkyl radical having 4 to 8 carbon atoms, wherein R.sup.6 is selected from the group consisting of hydrogen and alkyl radicals having 1 to 5 carbon atoms, wherein the molar ratio of the phosphite reactant to the phenolic reactant is from 1:1 to 1:9.
A composition prepared by reacting a combination comprising A. a triaryl phosphite having the following structural formula ##STR16## wherein R, R.sup.1 and R.sup.2 are selected from the group consisting of phenyl and substituted phenyl wherein the substituted phenyl contains one or two substituents selected from the group consisting of alkyl radicals containing 1 to 20 carbon atoms, alkylthio radicals containing 1 to 20 carbon atoms, chloro and aralkyl radicals having 7 to 20 carbon atoms,
- B. a phenol selected from the group consisting of phenols having the following structural formulae ##STR17## wherein R.sup.3 and R.sup.4 are selected from the group consisting of hydrogen, alkyl radicals having 1 to 12 carbon atoms, cycloalkyl radicals having 5 to 12 carbon atoms and aralkyl radicals having 6 to 12 carbon atoms and wherein at least one of R.sup.3 and R.sup.4 is a tertiary alkyl radical having 4 to 8 carbon atoms and is in a position ortho to the phenolic hydroxy group, and
- C. an aldehyde having the following structural formula
- R -- CHO
- where R is selected from the group consisting of hydrogen and alkyl radicals having 1 to 10 carbon atoms, wherein the molar ratio of phosphite/aldehyde/phenolic reactant is from 1:1:1 to 1:9:9.
Dependencies are inferred from the claim text.