PMGDM Patented as Adhesion Promoter in Nail Systems


METHOD OF PROMOTING ADHESION TO KERATINACEOUS SURFACE, USE OF SAME IN RESHAPING SURFACE, AND KIT THEREFOR

Inventors: George F. Cowperthwaite, Coatesville; Allen D. Johnston, West Chester, both of Pa.; Susan C. Sheariss, Swedesboro, N.J.

Assignee: Esschem, Inc., Linwood, Pa.
Appl. No.: 09/061,948

INVENTION

This invention relates to a method for improving the adhesion of monomeric and/or polymeric materials to keratinaceous substrates which substrates contain a major amount of alpha-keratin. An aspect of this invention relates to methods for reshaping essentially rigid keratinaceous surfaces such as nail plates wherein adhesion of the reshaping material is improved through the use of an adhesion promoting treatment. Still another aspect of this invention relates to a kit for nail reshaping (e.g. nail extension) which includes an adhesion-promoting composition.

A method for improving-with an adhesion-promoting composition-adhesion of a synthetic monomeric or polymeric material (such as a curable acrylic monomer/polymerized acrylic system) to a keratinaceous substrate, as in, for example, the reshaping of fingernails or toenails. The adhesion-promoting composition comprises (A) an organic, dipolar, aprotic liquid carrier and, uniformly distributed throughout said liquid carrier, (B) pyromellitic dianhydride glycerol dimethacrylate adduct (“PMGDM”). The PMGDM
isomer mixture which typically results when pyromellitic dianhydride is reacted with glycerol dimethacrylate is preferred, particularly in view of its high solubility in solvents of relatively low toxicity (e.g. lower aliphatic
ketones). The adhesion-promoting composition can, if desired, be included in a nail-reshaping kit containing the materials and implements needed to reshape the nail plate.

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