| 摘要 |
Alkylated xylenols are condensed with at least two different aldehydes, either simultaneously or consecutively, to give a liquid antioxidant composition; bisphenols are obtained using mono-aldehydes and tetrakisphenols using dialdehydes. Many aliphatic and aromatic aldehydes are specified. In examples, a commercial xylenol mixture is alkylated with diisobutylene and the product condensed with (1) isobutyraldehyde and paraldehyde, (2) iso- and n-butyraldehydes, (3)-(5) isobutyraldehyde followed by paraform-aldehyde. The term "alkylated" includes "cycloalkylated" and "aralkylated"; the starting materials are obtained in general by reacting a xylenol with a suitable C3- 12 olefin (preferably), organic halide or alcohol, of which many are listed in the Specification.ALSO:Natural and synthetic rubbers are stabilized by the presence of liquid antioxidant compositions obtained by condensing alkylated xylenols with at least two different aldehydes (see Division C2). Examples describe the stabilization of (a) vulcanized natural rubber and (b) SBR polymer wherein the antioxidant was added as a soap emulsion to the polymer latex which was then coagulated.
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