C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
18/106, 117/113,
C09D 163/00 (2006.01) C08F 2/48 (2006.01) C09D 4/06 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)
Patent
CA 2008345
Pigmented lacquers or varnishes for coloring contact lenses are prepared by prepolymerizing under UV radiation half of a mixture of: 60 to 70 weight % of N-vinyl-2-pyrrolidone, 8 to 12 weight % of hydroxyethyl methacrylate, 0.3 to 1 weight % of reticulant components, up to 13 weight % of cyclohexyl methacrylate or acrylate, 8 to 15 weight % of glycidyl acrylate or methacrylate, as binding agent, up to 1 weight % of acrylic or methacrylic acid, 0.1 to 0.5 weight % of UV pho-to:initiator of polymerization, under stirring and at ambient temperature, during a period of time sufficient to form a mass of oily consistency, which when radiation is turned off and is rapidly cooled in a -30°/-40° C bath, changes into a gel storable at low temperatures: extracting the free monomers from the gel until an easily malleable paste if formed; letting the paste settle at ambient temperature, so that it may lose by exudation the remainder of free monomers it might contain; dissolving this paste with part of the aforesaid mixture of liquid monomers without prepolymerization, in ponderal relation sufficient to form a solution at a temperature not higher than ambient temperature, then filtering and recovering a transparent, colorless and curable lacquer, to be kept between -18°/-25° C; and pigmenting the lacquer and mixing it with the necessary quantity of the chosen micronized pigments. The method of the invention enables to obtain pigmented or colorless lacquers or varnishes which are storable during periods of up to 6 months with no unfavorable changes and, consequently, ready to be used.
Laboratorio Pfortner Cornealent S.a.c.i F.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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