Polyolefins stabilized with cyclic diphosphites
AssigneeBorg-Warner Chemicals, Inc.
InventorsJames F. York, Leo L. Valdiserri
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Abstract
A process for the preparation of mixed aromatic-aliphatic phosphites. The process involves the reaction of an alkylphenol with diphenyl-(or a lower dialkyl-) pentaerythritol diphosphite. The process is simple and inexpensive, and produces a relatively pure product.
Claims8
A polymer composition comprising polypropylene and a minor proportion, sufficient to stabilize said polymer, of a di-(dialkylphenyl)pentaerythritol diphosphite.
A polymer composition comprising an olefin polymer normally susceptible to thermal degradation and a minor proportion, sufficient to stabilize said polymer, of a di-(alkylphenyl)pentaerythritol diphosphite prepared by mixing a diphenylpentaerythritol diphosphite or a dialkylpentaerythritol diphosphite wherein the alkyl groups contain 1-4 carbon atoms, with an alkylphenol having the formula:
- ##STR6## where R is alkyl of 3-10 carbon atoms and n is 2-3, and heating the resulting mixture so as to cause the formation of phenol or a lower alcohol, as the case may be, and to remove such phenol or lower alcohol by distillation.
Dependencies are inferred from the claim text.