Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...


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546 25, 25240021, C08K 534, C07F 965




Dibenzodioxaphosphepin and dibenzodioxaphosphocin derivatives are prepared by reacting selected 2,2'-biphenols with phosphorus trichloride in an organic solvent and then reacting the intermediate formed with a 1,4-dihydroxy-2,2,6,6-tetraalkylpiperidine. The phosphites formed are useful as stabilizers of organic polymers and lubricating oils, especially as process stabilizers for polyolefins, elastomers, polyesters and polycarbonates.

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