Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonmechanical aftertreatment
Patent
1988-11-25
1989-12-26
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonmechanical aftertreatment
264 41, 264233, 264344, 523106, 523108, 524548, 524558, 524701, 524809, 524850, 524853, B29D 1100
Patent
active
048896640
ABSTRACT:
Shaped hydrogel articles such as soft contact lenses are prepared by (1) molding or casting a polymerization mixture comprising: (a) a monomer mixture comprising a major proportion of a hydrophilic (meth)acrylate ester such as 2-hydroxyethyl methacrylate, and a cross-linking monomer; and (b) a water-displaceable diluent, wherein said diluent has a viscosity of at least 100 MPa Sec at 30.degree. C., and wherein said diluent consists essentially of a boric acid ester of certain dihydric alcohols, said dihydric alcohols having Hansen polar (.delta..sub.p) and Hansen hydrogen bonding (.delta..sub.h) cohesion parameters falling within the area of a circle defined as having a center at .delta..sub.h =20.5, .delta..sub.p =13, and a radius of 8.5, to produce a shaped gel of a coploymer of said monomers and said diluent, and (2) thereafter replacing said diluent with water.
REFERENCES:
patent: 4495313 (1985-01-01), Larsen
patent: 4680336 (1987-07-01), Larsen et al.
Heaton John C.
Kindt-Larsen Ture
Rastrelli Edmund C.
Lowe James
Metz Charles J.
Vistakon, Inc.
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