Thermoplastic polyurethanes and a two-stage process for their preparation
Polyurethane elastomers suitable for coating textiles, leather, paper and similar substrate and a multi-stage process for their production. The polyurethane elastomers are obtained from A. A POLYOL WITH AN AVERAGE MOLECULAR WEIGHT BETWEEN 900 AND 5300, B. 4,4'-DIISOCYANATODIPHENYLMETHANE AND C....
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
15.06.1976
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Subjects | |
Online Access | Get full text |
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Summary: | Polyurethane elastomers suitable for coating textiles, leather, paper and similar substrate and a multi-stage process for their production. The polyurethane elastomers are obtained from A. A POLYOL WITH AN AVERAGE MOLECULAR WEIGHT BETWEEN 900 AND 5300, B. 4,4'-DIISOCYANATODIPHENYLMETHANE AND C. A DIOL WITH A MOLECULAR WEIGHT BELOW 500, CHARACTERIZED IN THAT THE EQUIVALENT RATIO ((B)/(A)+(C)) IS BETWEEN 0.87 AND 1 AND IN THAT (A) CONTAINS AT LEAST 40% BY WEIGHT OF A POLYURETHANE OF THE FORMULA HO-R-O-C-NH-Q-NH-C-O-R-OH PARALLEL PARALLEL OO where R is a divalent group such as can be obtained by removing the hydroxyl groups from a diol which has a molecular weight of between 700 and 1750, and Q is a divalent aliphatic, cycloaliphatic, araliphatic or aromatic group which contains 2 to 20, and preferably, 4 to 15, carbon atoms; but Q is not |
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Bibliography: | Application Number: US19750546062 |