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Encapsulation of actives in core-shell and gel particles

  • US 6,774,179 B2
  • Filed: 12/13/2001
  • Issued: 08/10/2004
  • Est. Priority Date: 12/18/2000
  • Status: Expired due to Fees
First Claim
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1. A method for producing silicone particles where said method comprises emulsifying and reacting a composition comprising(I) a siloxane oligomer or polymer having units of embedded image

  • where each Y is independently selected from O (oxygen radicals);

    R′

    ;

    an alkyl group with 1 to 30 C atoms, an aryl group having 6 to 15 carbon atoms, an alkaryl group having 6 to 15 carbon atoms, and an aralkyl group having 6 to 15 carbon atoms;

    Z;

    a reactive group selected from epoxy-functional groups or chlorohydrin functional groups;

    Z′

    ;

    a functional group that reacts with epoxy-functional groups or chlorohydrin functional groups and;

    F;

    functional group other than Z or Z′

    , with the proviso that at least 50 mol % of the Y groups in the siloxane are R′

    , and there are at least two Z and/or Z′

    groups in the siloxane;

    (II) a crosslinker wherein said crosslinker contains Z and/or Z′

    groups with the proviso that when Y in siloxane (I) contains Z groups, the crosslinker contains Z′

    groups;

    when Y in siloxane (I) contains Z′

    groups, the crosslinkor contains Z groups; and

    when Y in siloxane (I) contains Z and Z′

    groups, the crosslinker contains Z groups, Z′

    groups or both;

    (III) at least one emulsion liquid;

    (IV) a surfactant; and

    (V) an active ingredient selected from sunscreens, fragrances, vitamins, drugs, antiperspirant salts, and α

    -hydroxy acids.

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