Alkanolamine/carbon dioxide adduct and polyurethane foam therewith
AssigneeThe Dow Chemical Company
InventorsGiuliano Guidetti, Luigi Pellacani, Maurizio Bottazzi
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Abstract
Disclosed is a carbamate adduct prepared by contacting carbon dioxide with an alkanolamine, preferably in a polar medium. The alkanolamine is characterized in that it consists of 1 or 2 ether linkages per molecule. The adduct finds value as a thermally decomposable blowing agent when preparing polyurethane foam and elastomeric products. Integral-skinned polyurethane products prepared in the presence of the carbamate adducts disclosed herein exhibit an enhanced abrasion resistance.
Claims14
A carbamate adduct obtained by contacting carbon dioxide with an alkanolamine wherein the alkanolamine is a substance containing one or two ether moieties per molecule.
A liquid composition which, based on their combined total weight, comprises (a) from about 5 to about 95 weight percent of a carbamate adduct, and (b) from about 95 to about 5 weight percent of a non aqueous medium, characterized in that the carbamate adduct is obtained by contacting carbon dioxide with an alkanolamine being a substance containing one or two ether moieties per molecule.
A process for obtaining a carbamate adduct which comprises contacting, in a non-aqueous medium, carbon dioxide with an alkanolamine characterized in that:
- (a) the alkanolamine corresponds to one of the following formulas:
- ##STR5## where independently R' is hydrogen, methyl or ethyl;
- R" is hydrogen, methyl or ethyl;
- the integer n is 1 or 2 or n' is 0, 1 or 2 with the proviso that the sum of n and n' is less than 3;
- and the integer x or x' is a whole number of from 1 to 4;
- and
- (b) the medium is a protic substance being a diol or triol,
- wherein components (a) and (b) are present in a parts by weight ratio of from about 95:5 to about 5:95.
Dependencies are inferred from the claim text.