Water-soluble polyurethane having comb-shaped hydrophobic group and application thereof
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United States of America Patent
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Nov 11, 2003
Grant Date -
Apr 18, 2002
app pub date -
Dec 12, 2000
filing date -
Apr 7, 2000
priority date (Note) -
Expired
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Abstract
Water-soluble polyurethane according to the present invention is obtained from polyalkylene glycols, diisocyanates, and comb-shaped hydrophobic diols represented by the following general formula (3): ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 is a hydrocarbon group; each of Y and Y' is hydrogen, a methyl group or a CH.sub.2 Cl group; each of Z and Z' is oxygen, sulfur or a CH.sub.2 group; n is an integer of 0 to 15 when Z is oxygen and is 0 when Z is sulfur or a CH.sub.2 group; n' is an integer of 0 to 15 when Z' is oxygen and is 0 when Z' is sulfur or a CH.sub.2 group. The water-soluble polyurethane is used as, for example, an extruding auxiliary for cement materials, a mortar thickening agent, an underwater concrete thickening agent, a ceramics forming binder and a moisturizer for hair cosmetics, all of which are characterized by excellent water retention and high shape retention.
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