Removable film forming gel compositions featuring adhesion promoters
Film-forming gel compositions, useful in creating conformable and flexible gel bandages, can be formulate from a film-forming polymer, an amine-rich adhesion promoter, and a volatile solvent. The gel compositions form relatively thick films when dried on tissue, and can exhibit enhanced breathability to promote wound healing.
1. A gel composition for use as a conformable film bandage, the gel composition comprising:
a polydiorganosiloxane polyamide;
an aminosilicone; and
a volatile solvent;
wherein the aminosilicone is an amine functionalized silicone that contains pendant groups comprising at least one of a primary amine, a secondary amine, a tertiary amine, or a quaternary ammonium group, and
wherein a film cast from the gel composition is self-supporting on a biological substrate and can be peeled off the substrate without substantially compromising the integrity of the film such that at least a portion of the film is removable in a single continuous layer.
2. The gel composition of claim 1 , comprising
about 5 to about 30 wt. % polydiorganosiloxane polyamide;
about 1 to about 35 wt. % aminosilicone; and
about 50 to about 80 wt. % volatile solvent,
each based on the total weight of the gel composition.
3. The gel composition of claim 1 , wherein the polydiorganosiloxane polyamide is a polydiorganosiloxane polyoxamide.
4. The gel composition of claim 1 , wherein the aminosilicone has an amine number greater than 25.
5. The gel composition of claim 4 , wherein the aminosilicone has a ratio of amine number to viscosity less than 1.0.
6. The gel composition of claim 1 , wherein the aminosilicone is selected from the group consisting of: aminodimethicones, trimethylsilylamodimethicones, aminoethylaminopropylsiloxane-dimethylsiloxane copolymers, and mixtures thereof.
7. The gel composition of claim 1 , wherein the aminosilicone has the structure
wherein R is an alkyl containing between 1 and 12 carbons, the blocks bearing the subscripts x and y may be randomly mixed, the total value of x is from 10 to 5,000, and the total value of y is from 2 to 20.
8. The gel composition of claim 1 , wherein the aminosilicone has the structure
wherein the blocks bearing the subscripts x and y may be randomly mixed, the total value of x is from 5 to 5,000, the total value of y is from 1 to 20, R and R′ may be the same or different, and R and R′ are each saturated, linear or branched alkyl groups of 1 to 12 carbon atoms.
9. The gel composition of claim 1 , wherein the aminosilicone comprises at least one silicone quaternary compound selected from the group consisting of: silicone quaternium-12, silicone quaternium-8, silicone quaternium-19, silicone quaternium-22, and mixtures thereof.
10. The gel composition of claim 1 , further comprising an MQ silicate tackifying resin.
11. The gel composition of claim 1 , further comprising:
an antiseptic agent, wherein the antiseptic comprises at least one of octenidine, chlorhexidine salt, alexidine salt, polyhexamethylene biguanide salt, benzalkonium salt, cetyl pyridinium salt, cetrimonium salt, or benzethonium salt, and combinations thereof.
12. The gel composition of claim 1 , wherein the volatile solvent is selected from the group consisting of volatile linear and cyclic siloxanes, volatile polydimethylsiloxanes, isooctane, octane, and combinations thereof.
13. The gel composition of claim 1 , further comprising a filler, wherein the filler is at least one of kaolin and fumed silica.
14. The gel composition of claim 1 , substantially free of one or both of a tackifier and a coagulant.
15. A self-supporting film cast from the composition of claim 1 , wherein the self-supporting film exhibits an elongation of at least 100% and an ultimate tensile strength of at least 0.3 MPa after drying on a biological substrate.
16. The self-supporting film of claim 15 , wherein the film exhibits an upright MVTR of at least 300 g/m 2 /24 hours and a Skin Adhesion of at least 50 g/inch and no greater than 900 g/inch.
17. The self-supporting film of claim 15 , wherein at least a portion of the self-supporting film has a thickness of at least 2 mils and no greater than 20 mils.
18. The self-supporting film of claim 17 , wherein the self-supporting film comprises:
(a) 50-75 wt. % polydiorganosiloxane polyamide;
(b) 0.1-30 wt. % filler; and
(c) 10-60 wt. % aminosilicone, based on the weight of the film.
19. The self-supporting film of claim 18 , further comprising:
about 15 to about 35 wt. % tackifier, based on the weight of the self-supporting film.