Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2007-03-14
2008-11-04
Richter, Johann (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S486000, C424S070110
Reexamination Certificate
active
07445770
ABSTRACT:
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:whereinR1represents a bivalent radical of a dihydroxyl functional compound,R2represents a hydrocarbon radical of an aliphatic or cycloaliphatic polyisocyanate,R3represents a radical of a low molecular weight diol, optionally substituted with ionic groups,n is from 0 to 5, andm is >1;B) at least one chain extender according to the formula:in-line-formulae description="In-line Formulae" end="lead"?H2N—R4—NH2in-line-formulae description="In-line Formulae" end="tail"?wherein R4represents an alkylene or alkylene oxide radical not substituted with ionic or potentially ionic groups; andC) at least one chain extender according to the formula:in-line-formulae description="In-line Formulae" end="lead"?H2N—R5—NH2in-line-formulae description="In-line Formulae" end="tail"?wherein R5represents an alkylene radical substituted with ionic or potentially ionic groups.
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Berezkin Yuliya
Schmitt Peter D.
Unal Serkan
Bayer MaterialScience LLC
Cheung Noland J.
Karpinski Luke E
Klemz Robert S.
Richter Johann
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