Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1996-09-19
1998-01-20
Sergent, Rabon
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
524 35, 524311, 524312, 524589, 524733, 524773, 524871, 106 12, C08K 505, C08K 511
Patent
active
057104344
ABSTRACT:
The invention is directed to a composition of matter useful as a paper impregnant, to the method of its use, and to the products produced by the method. Poly (diphenylmethane diisocyanate) or PMDI has been used in the past as a paper impregnant with or without propylene carbonate as a diluent. These products have generally required pressing under high pressures and at elevated temperatures. It has now been found that triacetin and/or triethyl citrate in usages up to about 20% of PMDI give superior performance in impregnated products. The modified PMDI will cure at essentially ambient conditions in times as short as 1-2 days to insoluble polyureas with low residual amounts of isocyanates and reaction byproducts such as 4,4'-diaminodiphenylmethane. The treated papers can be used in applications of which skins for sandwich panels and high strength corrugated board would be exemplary.
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Levy et al.; "Action de L'isocyanate de phenyle sur les Citrates D'ethyle de Methyle"; Bulletin De La Societe Chimique De France; No. 12; 1966; pp. 3956-3959.
Hunter Frank R.
Park David W.
Sergent Rabon
Weyerhaeuser Company
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