Water-soluble blocking wax formulation

Details Water-soluble blocking wax formulation Water-soluble blocking wax formulation

C - Chemistry, Metallurgy

09

J

C09J 171/02 (2006.01) B24B 13/005 (2006.01) C08J 5/12 (2006.01) C09J 101/00 (2006.01) C09J 133/00 (2006.01) G02C 13/00 (2006.01)

Patent

CA 2429893

The invention provides, in a first embodiment, a blocking wax composition. The blocking wax comprises from about 50 to about 90 weight percent of a water- soluble continuous phase and from about 10 to about 50 weight percent of a discontinuous solid phase filler that is substantially inert to the continuous phase. The invention further provides a method for mounting a contact lens blank for machining.

L'invention concerne, dans un premier mode de réalisation, une composition de cire de blocage. La cire de blocage comprend d'environ 50 à environ 90 pour cent en poids d'une phase continue soluble dans l'eau et d'environ 10 à environ 50 pour cent en poids d'une charge en phase solide discontinue sensiblement inerte par rapport à la phase continue. L'invention concerne également un procédé de montage d'une ébauche de lentille de contact pour son usinage.

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