Antioxidant resins from mercaptoaldehydes
AssigneeCoalite and Chemical Products Limited
InventorGerald William Langsley
Life of this patent
Estimating the term…
Abstract
It has been found that a sulphur containing resin which is the condensation product of (i) one or more mercaptoaldehydes and (ii) one or more meta-substituted phenols has good antioxidant properties. Mixtures of m/p-alkylphenols are used to particular advantage in the production of this resin. A small amount of the resin retards the oxidation of rubbers or polyolefins and the resin is particularly useful as a melt stabilizer during the extrusion of a polymer.
Claims22
A sulphur containing resin which is the condensation product of (i) one or more mercaptoaldehydes and (ii) one or more meta-substituted phenols, or a mixture of one or more meta-substituted phenols and one or more other phenols wherein the meta-substituted phenol has the general formula:
- ##STR3## in which R.sup.2 denotes a substituent and at least one of R.sup.1, R.sup.3, R.sup.4 , and R.sup.5 denote hydrogen, any of R.sup.1, R.sup.3, R.sup.4 and R.sup.5 not denoting hydrogen denoting a substituent, said mercaptoaldehydes having the general formula:
- ##STR4## in which R is a C.sub.1 - C.sub.17 straight or branched alkyl group and R.sub.1 denotes hydrogen or a C.sub.1 - C.sub.4 alkyl group.
A process, according to claim 26, wherein said solvent is toluene.
Dependencies are inferred from the claim text.