Patent ID: 6686422
Filing Date: 2004-02-03
Classification: C08F

Abstract:
A method for inhibiting polymerization of diene compounds comprising adding to the diene compound an effective polymerization inhibiting amount of a mixture of:a) a first hindered or unhindered phenol selected from the group consisting of: tert-butylcatechol (TBC); tert-butyl hydroquinone (TBHQ); 2,6-di-tert-butyl-4-methoxyphenol (DTBMP); 2,4-di-tert-butylphenol; 2,5-di-tert-butylphenol; 2,6-di-tert-butylphenol; 2,4,6-tri-tert-butylphenol; butylated hydroxyltoluene (BHT); 2,6-di-tert-butyl-4-nonylphenol; 2,6-di-tert-butyl-4-sec-butylphenol; 2-butyl-4-methylphenol; 2-tert-butyl-4-methoxyphenol; butylated hydroxyanisole (BHA); 2,5-di-tert-butyl hydroquinone (DTBHQ); tert-amyl hydroquinone; 2,5-di-amyl hydroquinone; 3,5-di-tert-butylcatechol; hydroquinone; hydroquinone monomethyl ether; hydroquinone monoethyl ether; hydroquinone monobenzyl ether; and 3,3,3â€²,3â€²-tetramethyl,1,1-spirobis-indane-5,5â€²,6,6â€²-tetrol (Tetrol); b) at least one additional component selected from the group consisting of low nitrogen content components selected from the group consisting of a stable nitroxide and a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group; and a second hindered or unhindered phenol selected from the group a).