Curable, solvent removable gel for nails
Photopolymerizable topcoat and color coat gel compositions suitable for forming a photopolymerized nail coating are described. Both gel compositions include a mixture of one or more pre-formed polymers, a (meth)acrylic monomer, a multi-(meth)acrylate crosslinker, a UV photoinitiator and an antioxidant. The color coat gel composition includes pigments, a smectite clay and silica.
1 . A topcoat composition consisting of: a single phase mixture of a preformed crosslinked polyester of C5-C12 alkyl-dicarboxylic acid, a C2-C10 diol and an aromatic or alkyl tricarboxylic acid or anhydride thereof, a (meth)acrylate monomer of di-C1-C3 alkylamino C1-C3 alkyl methacrylate, a multi-(meth)acrylate crosslinker of trimethylolpropane triacrylate or tetramethylol methane tetraacrylate, a UV photoinitiator and an antioxidant, wherein;
the preformed crosslinked polyester concentration is about 40 wt. % to about 44 wt. %,
the (meth)acrylate monomer concentration is about 35 wt. % to about 45 wt. %,
the cross-linker concentration is about 14 wt. % to about 17 wt. %,
the weight ratio of the weight amount of the preformed crosslinked polyester to the weight amount of the combination of monomer and crosslinker is in a range of about 0.5:1 to about 1.1:1,
the (meth)acrylate monomer is a solvent for and solubilizes the preformed crosslinked polyester,
the preformed crosslinked polyester is soluble in organic solvent, and
the topcoat composition is a homogeneous, clear, stable, single phase mixture, does not separate into individual components, is essentially free of organic solvent and aqueous medium, and optionally includes one or more of a free radical scavenger, a polymerization regulator, a plasticizer, a surfactant and an emulsifier.
2 . The topcoat composition according to claim 1 having a viscosity of at least 750 cP and/or a density of about 1 g per ml.
3 . The topcoat composition according to claim 1 wherein the polyester has a wt. avg. MW of from about 5 kDa to about 500 kDa and the wt. % ratio of preformed crosslinked polyester to monomer is about 0.89:1 to about 1.26:1.
4 . The topcoat composition according to claim 1 wherein the polyester is a crosslinked polyester copolymer of adipic acid, neopentyl glycol and trimellitic anhydride, and/or the (meth)acrylate monomer is dimethylaminoethyl methacrylate, and/or the crosslinker is trimethylolpropane triacrylate, wherein the weight ratio of the copolymer to the combination of monomer and crosslinker is in a range of 0.6:1 to about 1.1:1.
5 . The topcoat composition according to claim 1 wherein the photoinitiator is benzophenone and/or the antioxidant is butylated hydroxytoluene.