| 摘要 |
The invention relates to an aqueous polyurethane dispersion suitable for use in personal care products, the dispersed polyurethane comprising the reaction products of: A) a prepolymer according to the formula: wherein R<SUB>1 </SUB>represents a bivalent radical of a dihydroxyl functional compound, R<SUB>2 </SUB>represents a hydrocarbon radical of an aliphatic or cycloaliphatic polyisocyanate, R<SUB>3 </SUB>represents a radical of a low molecular weight diol, optionally substituted with ionic groups, n is from 0 to 5, and m is >1; B) at least one chain extender according to the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>H<SUB>2</SUB>N-R<SUB>4</SUB>-NH<SUB>2 </SUB><?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUB>4 </SUB>represents an alkylene or alkylene oxide radical not substituted with ionic or potentially ionic groups; and C) at least one chain extender according to the formula: <?in-line-formulae description="In-line Formulae" end="lead"?>H<SUB>2</SUB>N-R<SUB>5</SUB>-NH<SUB>2 </SUB><?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUB>5 </SUB>represents an alkylene radical substituted with ionic or potentially ionic groups.
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