US 6,039,913 A · Process for the manufacture of an ophthalmic molding

Abstract

The present invention relates to a process for the manufacture of a molding, which comprises the following steps: a) providing at least one prepolymer comprising one or more crosslinkable groups, wherein the prepolymer is an amphiphilic segmented copolymer comprising at least one hydrophobic segment A and one hydrophilic segment B; b) preparing a mesophase of the prepolymer which is at least partly bicontinuous; c) introducing the mesophase obtained into an ophthalmic mold; d) triggering of the crosslinking; and e) opening the mold such that the molding can be removed. The process of the invention is particularly suited for the manufacture of membranes and ophthalmic moldings such as contact lenses.

Claims24

Dependent claims

A process for the manufacture of a molding, which comprises the following steps:

a) providing at least one prepolymer comprising one or more crosslinkable groups, wherein the prepolymer is an amphiphilic segmented copolymer comprising at least one hydrophobic segment and one hydrophilic segment;
b) preparing an at least partly bicontinuous mesophase of the prepolymer by combining the prepolymer with an aqueous solution at a ratio that will give a microstructure which is at least partly bicontinuous and causing or allowing the bicontinuous microstructure to form;
c) introducing the mesophase obtained into an ophthalmic mold;
d) crosslinking the prepolymer to form the molding;
and
e) opening the mold such that the molding can be removed.

3 more elements

Dependencies are inferred from the claim text.

Process for the manufacture of an ophthalmic molding

Life of this patent

Process for the manufacture of an ophthalmic molding

Life of this patent

Abstract

Claims24