Materials for reshaping of essentially rigid keratinaceous surfaces

A method of forming a laminar poly(acrylic ester) prosthesis in place, in vivo, on a human nail plate surface, comprising the step of applying to said human nail plate surface a combined part A/part B composition comprising:

• is a powdery mass comprising a poly(acrylic ester) and an encapsulated compound of the formula III
• 6
• wherein R1 through R4 are identical to or different from each other and are hydrogen, a mononuclear carbocyclic aromatic group, a C1-C18 aliphatic group, a C1-Cl18 aliphatic radical substituted with a mononuclear carbocyclic aromatic group, a cycloaliphatic group or an aromatic radical having from 6 to 10 ring carbon atoms and up to five aliphatic or oxy- or oxo-aliphatic substituents,
• with the proviso that at least R3 or R4 is hydrogen,
• and contains a metal salt, the metal of said metal salt having a plurality of oxidation states which differ from each other in electrochemical potential by less than about a volt, and is a liquid acrylic ester monomer composition which is essentially free of aromatic tertiary amine and, optionally, an organic ammonium compound and a crosslinking compound;
• said parts A and B having been kept separate from each other until combined for said applying step.

A cured laminar poly (acrylic ester) prosthesis comprising cured parts A and B which have been cured by combining parts A and B:

• said part A is a powdery mass comprising a poly(acrylic ester) and an encapsulated compound of the formula III
• 7
• wherein R1 through R4 are identical to or different from each other and are hydrogen, a mononuclear carbocyclic aromatic group, a C1-C18 aliphatic group, a C1-C18 aliphatic radical substituted with a mononuclear carbocyclic aromatic group, a cycloaliphatic group or an aromatic radical having from 6 to 10 ring carbon atoms and up to five aliphatic or oxy- or oxo-aliphatic substituents,
• with the proviso that at least R3 or R4 is hydrogen,
• and contains a metal salt, the metal of said metal salt having a plurality of oxidation states which differ from each other in electrochemical potential by less than about a volt and said part B is a liquid acrylic ester monomer composition which is essentially free of aromatic tertiary amine and, optionally, an organic ammonium compound and a crosslinking compound;
• said parts A and B having been kept separate from each other until combined for said applying step.

A separately-packaged two-part system for forming, upon mixing of the two parts, a nail plate prosthesis in place on a nail plate, said two separately packaged parts, part A and part B, consisting essentially of:

• part A:
• a powdery mass consisting essentially of at least one poly(acrylic ester) and an encapsulated compound of the formula III
• 8
• wherein R1 through R4 are identical to or different from each other and are hydrogen, a mononuclear carbocyclic aromatic group, a C1-C18 aliphatic group, a C1-C18 aliphatic radical substituted with a mononuclear carbocyclic aromatic group, a cycloaliphatic group or an aromatic radical having from 6 to 10 ring carbon atoms and up to five aliphatic or oxy- or oxo-aliphatic substituents,
• with the proviso that at least R3 or R4 is hydrogen,
• and said part A being essentially free of aromatic or aliphatic acyl peroxide;
• and a co-catalyst for said part A, said co-catalyst comprising a metal salt,
• part B:
• a liquid acrylic ester monomer consisting essentially of the ester and, an organic ammonium compound of the formula IV R5R6R7R8N+X− (IV), where R5, R6, R7, and R8 are identical to or different from each other and are C1-C30-aliphatic or C0.3-C12-cycloaliphatic;
• and X is halide, alkylsulfonate, aryl sulfonate, alkyl phosphonate, aryl phosphonate, or one equivalent of sulfate or phosphate per equivalent of nitrogen;
• optionally, a crosslinker;
• said part B being essentially free of aromatic tertiary amine.

A separately-packaged two-part system for forming, upon mixing of the two parts, a nail plate prosthesis in place on a nail plate, said two separately packaged parts, part A and part B, consisting essentially of:

• part A:
• a powdery mass consisting essentially of at least one poly(acrylic ester) and an encapsulated compound of the formula III
• 9
• wherein R1 through R4 are identical to or different from each other and are hydrogen, a mononuclear carbocyclic aromatic group, a C1-C18 aliphatic group, a C1-C18 aliphatic radical substituted with a mononuclear carbocyclic aromatic group, a cycloaliphatic group or an aromatic radical having from 6 to 10 ring carbon atoms and up to five aliphatic or oxy- or oxo-aliphatic substituents,
• with the proviso that R3 or R4 is hydrogen,
• and a co-catalyst comprising a metal salt,
• part B:
• a liquid acrylic ester monomer consisting essentially of ester and an organic ammonium compound of the formula IV R5R6R7R8N+X− (IV), where R5, R6, R7, and R8 are identical to or different from each other and are C0.1-C30-aliphatic or C3-C12-cycloaliphatic;
• and X is halide, alkylsulfonate, aryl sulfonate, alkyl phosphonate, aryl phosphonate, or one equivalent of sulfate or phosphate per equivalent of nitrogen;
• optionally, a cross linker;
• said part B being essentially free of aromatic tertiary amine.

A separately-packaged two-part system for forming, upon mixing of the two parts, a nail plate prosthesis in place on a nail plate, said two separately packaged parts, part A and part B, consisting essentially of:

• part A:
• a powdery mass consisting essentially of at least one poly(acrylic ester) with an encapsulated compound of the formula III
• 10
• wherein R1 through R4 are identical to or different from each other and are hydrogen, a mononuclear carbocyclic aromatic group, a C1-C18 aliphatic group, a C1-C18 aliphatic radical substituted with a mononuclear carbocyclic aromatic group, a cycloaliphatic group or an aromatic radical having from 6 to 10 ring carbon atoms and up to five aliphatic or oxy- or oxo-aliphatic substituents,
• with the proviso that at least R3 or R4 is hydrogen
• and said part A contains less than about 2 weight % of co catalyst,
• part B:
• a liquid acrylic ester monomer consisting essentially ester and optionally, an organic ammonium compound of the formula IV R5R6R7R8N+X− (IV), where R5, R6, R7, and R8 are identical to or different from each other and are C1-C30-aliphatic or C3-C12-cycloaliphatic;
• and X is halide, alkylsulfonate, aryl sulfonate, alkyl phosphonate, aryl phosphonate, or one equivalent of sulfate or phosphate per equivalent of nitrogen;
• optionally, a crosslinker;
• said part B being essentially free of aromatic tertiary amine.