Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating
Patent
1987-03-05
1989-02-21
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
264 21, 264 22, 264313, 264337, 425808, B29D 1100
Patent
active
048062871
ABSTRACT:
A method and apparatus for the polymerization cast molding of lenses from hydrophilic gels. A hydrophobic liquid which is essentially immiscible with a hydrophilic polymerization mixture is introduced into a mold having a hydrophobic surface, followed by dosing of the hydrophilic monomer mixture which is allowed to polymerize to form a drop which is pressed, while polymerizing, into the mold with a punch having a hydrophobic molding surface. The polymerizing monomer mixture is maintained under the pressure of the punch until the end of the polymerization. Any overflow of the two liquids is allowed to escape between the mold and the punch. The apparatus comprises a concave mold with an inner hydrophobic, rotation-symmetrical surface, and a punch with a hydrophobic molding surface which when placed in relationship to the mold has an overflow space formed between the mold and the punch.
REFERENCES:
patent: 2290917 (1942-07-01), Smith
patent: 3361858 (1968-01-01), Wichterle
patent: 3380718 (1968-04-01), Neefe
patent: 4208364 (1980-06-01), Shepherd
patent: 4347198 (1982-08-01), Ohkada et al.
Krcova Zuzana
Sulc Jiri
Vacik Jiri
Ceskoslovenska akademie ved
Lowe James
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