Mold material made with additives

Details Mold material made with additives Mold material made with additives

1995-09-29

1998-12-15

Vargot, Mathieu D.

Static molds

Container-type molding device

Of named component

425175, 425808, B28B 700, B29C 3340

Patent

active

058492097

ABSTRACT:
The present invention is directed to a composition of polystyrene or polypropylene with at least 0.5% (w/w)of an additive or wetting agent, the article of manufacture comprised thereof, such as a mold for making contact lenses and the mold assembly containing said mold, and the use of such mold so to minimize defects, such as holes, puddles, chips and tears in the lens.

REFERENCES:
patent: 3422168 (1969-01-01), Bowser
patent: 3424607 (1969-01-01), Coscia
patent: 4159292 (1979-06-01), Neefe
patent: 4311654 (1982-01-01), Blandin
patent: 4534916 (1985-08-01), Wichterie
patent: 5417557 (1995-05-01), Ross et al.

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