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IP.com Disclosure Number: IPCOM000032930D
Publication Date: 2004-Nov-18
Document File: 1 page(s) / 25K

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The IP.com Prior Art Database


Amine initiated polyol (poly alcohol) compositions that exhibit improved heat stability are disclosed. Such compositions comprise a polyol initiated with an amine or polyamine and an antioxidant package capable of inhibiting the high temperature chain cleavage that results when oxidation of the amine occurs. Preferred antioxidant packages include those containing a diphenylamine or a derivative of diphenylamine or a combination of diphenylamine with a phosphite(s), such as tris(nonylphenyl)phosphite. Foams produced from such polyol compositions have improved heat stability at elevated temperatures.

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Various catalytic polyols have been proposed to reduce the amount of fugitive amine catalyst used in the production of polyurethane foams.  See for example U.S. Patent 5,476,969 and EP Publication 0 488 219.  Of particular importance are autocatalytic polyols initiated with an amine or polyamine containing primary and/or secondary and/or tertiary amine groups.  As polyols, particularly polyether polyols are subject to thermal degradation, antioxidants are added during or shortly after manufacture to reduce peroxide formation during storage and to reduce the possibility of scorching during polyurethane foam manufacturing.

With a shift toward the use of such catalytic polyols, there is a need to develop effective antioxidant packages to reduce the thermal degradation of such amine containing polyols.  We have found that the oxidation mechanism is substantially inhibited when the polyol is combined with secondary arylamines such as diphenylamine or derivatives of diphenylamine including octylated diphenylamine.  Of particular importance are amines with low volatility, that is those having a molecular weight of 400 or greater.  The antioxidative properties are further enhanced when the secondary arylamine, particularly diphenylamine, is used in combination with phosphites such as trisnonylphenylphosphite or tris di tertbutyl phosphite.  The resulting polyols retain their clarity and maintain their molecular weight...