MULTI-PHASE EMULSIONS BASED ON AMPHIPHILIC BLOCK COPOLYMERS
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United States of America Patent
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Issued Date -
Mar 3, 2011
app pub date -
Sep 2, 2009
filing date -
Sep 2, 2009
priority date (Note) -
Abandoned
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Abstract
An composition comprises (a) a continuous aqueous phase; (b) an oily phase; and (c) an amphiphilic emulsifying system comprising a block copolymer having the formula (A)p-(B)q-(C)r, in which (B)q is a hydrophilic block and (C)r is a hydrophobic block; wherein p, q and r are integers with the proviso that: if p is 0, then A is other than hydroxyl or reactive functional groups and the block copolymer is a diblock copolymer; B and C are each individual repeating) units; if p is >1, then the block copolymer is a triblock copolymer, in which (A)p is a hydrophobic block; the hydrophobic blocks (A)p and (C)r are each homopolymers or heteropolymers; the repeating units A and C are the same or different; and wherein the ratio q/(p+r) is sufficient high so that the hydrophilic-lipophilic balance value of the block copolymer is >10.
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