The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1976
Filed:
Feb. 24, 1975
Patricia C Wang, Palo Alto, CA (US);
James A Dale, Menlo Park, CA (US);
Dynapol, Palo Alto, CA (US);
Abstract
Phenolic polymers having 3 to 1000 repeating units of the general structural formula ##STR1## wherein X and X.sup.1 independently are hydrogens or methyls, R is a lower alkyl of from 1 to 6 carbon atoms or an aryl, alkaryl or aralkyl of from 6 to 14 carbon atoms, and R.sup.1, R.sup.2 and R.sup.3 independently are hydrogen, lower alkyls of from 1 to 6 carbon atoms, aralkyls of from 8 to 14 carbons, or alkoxys or aralkyloxys of from 1 to about 14 carbons, are prepared in one step by contacting an R.sup.1, R.sup.2 and R.sup.3 -containing phenol having two hydrogens ortho to the hydroxyl group with a low purity diolefinic hydrocarbon under ortho-alkylation conditions in the presence of an effective amount of an ortho-alkylation catalyst. These materials find use as antioxidants, especially for edibles, where their polymeric nature offers advantages.