Cosmetic compositions having in-situ hydrosilylation cross-linking
Compositions and methods for the in situ formation of hydrosilylation (addition) cross-linked organosiloxane films are disclosed. The disclosed films are long-lasting, flexible, transfer-resistant, and water-proof. The film-forming compositions generally comprise alkoxy-terminated organosiloxane polymers and a catalyst and are useful for formulating cosmetics and personal care products.
1. A method for forming an elastomeric film on a body comprising:
applying to said body, a siloxane polymer, a functional agent and a hydrosilane or a hydrosiloxane in the presence of a cross-linking catalyst; said siloxane polymer having at least two alkenyl-functionalized terminal groups or alkenyl-functionalized side chains; said hydrosiloxane having at least two Si—H units at the terminal ends;
wherein said cross-linking catalyst induces in situ cross-linking of said siloxane polymer through the addition reaction of said hydrosilane or a hydrosiloxane to said terminal groups or side chains of said siloxane polymer to provide a highly elastomeric, water-resistant, oil-resistant and durable film thereon;
wherein the elastomeric film contains a functional agent, said functional agent does not migrate or transfer from the elastomeric film, and said elastomeric film is a cosmetic or personal care product, wherein said hydrosilane or hydrosiloxane is selected from the group consisting of alkyltrihydrosilanes, aryltrihydrosilanes, dialkyldihydrosilanes, diaryldihydrosilanes, trialkylhydrosilanes, triarylhydrosilanes, alkylhydrosiloxanes, arylhydrosiloxanes, t-butyldimethylhydrosilane, triethylhydrosilane, diethyldihydrosilane, triisopropylhydrosilane, or combinations thereof.
2. The method of claim 1 wherein said alkenyl-functionalized terminal groups or alkenyl-functionalized side chains comprises at least one optionally substituted branched or straight chain C 2 -C 10 alkenyl group.
3. The method of claim 2 wherein said alkenyl-functionalized terminal groups or alkenyl-functionalized side chains comprises at least one vinyl group.
4. The method of claim 1 wherein said cross-linking catalyst comprises a metal selected from the group VIII metals.
5. The method of claim 4 wherein said cross-linking catalyst comprises a metal selected from the group consisting of palladium, platinum, and rhodium.
6. A method for entrapping a functional agent within an elastomeric film disposed on a biological surface comprising:
contacting said biological surface with said functional agent, a siloxane polymer and a hydrosilane or a hydrosiloxane, in the presence of a cross-linking catalyst; said siloxane polymer having at least two alkenyl-functionalized terminal groups or alkenyl-functionalized side chains; said hydrosiloxane having at least two Si—H units at the terminal ends:
wherein said cross-linking catalyst induces in situ cross-linking of said siloxane polymer through the addition reaction of said hydrosilane or hydrosiloxane to said terminal groups or side chains of said siloxane polymer to provide a highly elastomeric, water-resistant, oil-resistant and durable film thereon, said film is a cosmetic or personal care product;
thereby preventing migration or transfer of said functional agent from said biological surface, wherein said hydrosilane or hydrosiloxane is selected from the group consisting of alkyltrihydrosilanes, aryltrihydrosilanes, dialkyldihydrosilanes, diaryldihydrosilanes, trialkylhydrosilanes, triarylhydrosilanes, alkylhydrosiloxanes, arylhydrosiloxanes, t-butyldimethylhydrosilane, triethylhydrosilane, diethyldihydrosilane, triisopropylhydrosilane, or combinations thereof.
7. The method of claim 6 wherein said functional agent is selected from the group consisting of pigments, lakes, dyes, opacifiers, pearling agents, insect repellants, UV absorbers, UV blockers, antiperspirants, moisturizers, conditioners, and tooth whiteners.
8. A formulation for providing an elastomeric film on a biological surface comprising:
(i) a first component comprising a siloxane polymer and a cross-linking catalyst; said siloxane polymer having at least two alkenyl-functionalized terminal groups or alkenyl-functionalized side chains; and
(ii) a second component comprising a hydrosilane or a hydrosiloxane having at least two Si—H units at the terminal ends,
wherein said first and second components are prevented from coming into intimate contact prior to use; said first component or said second component comprises a functional agent; and
wherein said cross-linking catalyst induces in situ cross-linking of said siloxane polymer through the addition reaction of said hydrosilane or hydrosiloxane to said terminal groups or side chains of said siloxane polymer to provide a highly elastomeric, water-resistant, oil-resistant and durable film thereon, said film is a cosmetic or personal care product, wherein said hydrosilane or hydrosiloxane is selected from the group consisting of alkyltrihydrosilanes, aryltrihydrosilanes, dialkyldihydrosilanes, diaryldihydrosilanes, trialkylhydrosilanes, triarylhydrosilanes, alkylhydrosiloxanes, arylhydrosiloxanes, t-butyldimethylhydrosilane, triethylhydrosilane, diethyldihydrosilane, triisopropylhydrosilane, or combinations thereof.
9. The method of claim 1 wherein said functional agent is selected from the group consisting of pigments, lakes, dyes, opacifiers, pearling agents, insect repellants, UV absorbers, UV blockers, antiperspirants, moisturizers, conditioners, and tooth whiteners.
10. The formulation of claim 8 , wherein said functional agent is selected from the group consisting of pigments, lakes, dyes, opacifiers, pearling agents, insect repellants, UV absorbers, UV blockers, antiperspirants, moisturizers, conditioners, and tooth whiteners.