Encapsulation of actives in core-shell and gel particles

Details Encapsulation of actives in core-shell and gel particles Encapsulation of actives in core-shell and gel particles

2001-12-13

2004-08-10

Robertson, Jeffrey B. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S837000, C524S838000, C524S863000, C524S864000, C525S474000, C525S476000, C424S401000

Reexamination Certificate

active

06774179

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to the formation of silicone core-shell or gel particles that can be used encapsulate actives.
BACKGROUND OF THE INVENTION
In personal care formulations it has become desirable to use low viscosity silicones to impart a number of benefits to the formulation. However, because of the addition of the low viscosity silicone, there must be additionally added a thickener to the personal care formulation. Certain silicone polymers have found utility as the thickening agent because they can be used in the quantities necessary to thicken the composition without degrading the properties of the personal care formulation. Typically, the silicone polymer and low viscosity silicone are combined to form a paste. This paste can then be used in the personal care formulation. Such silicone polymers are described in U.S. Pat. No. 4,987,169 to Kuwata et al., U.S. Pat. No. 5,760,116 to Kilgour et al., U.S. Pat. No. 5,811,487 to Schulz, Jr. et al. and U.S. Pat. No. 5,889,108 to Zhang and U.S. Pat. No. 6,238,657 to Lin et al.
This invention relates to the formation of silicone core-shell or gel particles that can be used to encapsulate actives. The resulting encapsulated actives can be used in personal care formulations.
SUMMARY OF THE INVENTION
This invention relates to the formation of silicone core-shell or gel particles that can be used encapsulate actives. The silicone particles are produced by emulsifying and reacting a composition comprising
(I) a siloxane oligomer or polymer having units of
 where Y independently is
O (oxygen radicals);
R′ is selected from the group consisting of 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 is selected from epoxy-functional groups, chlorohydrin functional groups, or mixtures thereof;
Z′ is a functional group that react with epoxy-functional groups or chiorohydrin functional groups (i.e. amine, hydroxyl); and
F is a functional group other than Z or Z′,
with the proviso that at least 50 mol % of the Y groups in the siloxane are R′, preferably methyl 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 crosslinker 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) and active ingredient.
The core-shell and gel particles produced by this method are useful in the encapsulation of actives. The encapsulated actives are useful in personal care products, textiles, auto care products, and laundry products for the delivery of active ingredients.


REFERENCES:
patent: 4987169 (1991-01-01), Kuwata et al.
patent: 5017297 (1991-05-01), Spyropoulos et al.
patent: 5665804 (1997-09-01), Hill et al.
patent: 5760116 (1998-06-01), Kilgour et al.
patent: 5811487 (1998-09-01), Schulz, Jr. et al.
patent: 5889108 (1999-03-01), Zhang
patent: 5948855 (1999-09-01), Lin et al.
patent: 6238657 (2001-05-01), Lin et al.
patent: 6248855 (2001-06-01), Dalle et al.
patent: 6653378 (2003-11-01), Ferritto et al.
patent: 0393634 (1990-10-01), None
patent: 0739928 (1996-10-01), None
patent: 0893467 (1999-01-01), None
patent: 1020494 (2000-07-01), None
patent: 1048686 (2000-11-01), None
patent: 1296136 (1972-11-01), None
patent: WO 95/35183 (1995-12-01), None
patent: WO 99/26585 (1999-06-01), None

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