# US 10,371,965 B2 · Hydrogel contact lens having wet surface, and manufacturing method therefor

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- Number: US 10,371,965 B2
- Document ID: US10371965B2
- Status: Granted
- Kind: B2
- Application number: 15/309,753
- Filed: 2015-05-08
- Published: 2017-05-25
- Granted: 2019-08-06
- Earliest claimed: 2014-05-09
- Assignees: Interojo Inc.
- Applicants: Interojo Inc.
- Inventors: Soo Chang Lee; Kyung Hee Oh
- Web page: https://patentgrep.com/patent/US10371965B2

## CPC

- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/056: Forming hydrophilic coatings
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 1/043: {Contact lenses}
- G02C 7/04: Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00)
- G02C 7/049: {Contact lenses having special fitting or structural features achieved by special materials or material structures}
- C08J 2333/14: of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- C08J 2343/04: Homopolymers or copolymers of monomers containing silicon
- G02B 2207/109: Sols, gels, sol-gel materials
- G02C 2202/16: Laminated or compound lenses
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

The present invention relates to a hydrogel contact lens having a wet surface, and a manufacturing method therefor and, more specifically, to a hydrogel contact lens and a manufacturing method therefor wherein the hydrogel contact lens satisfies basic physical properties of a hydrogel contact lens and has excellent wettability by forming a hydrophilic surface layer of an interpenetrating polymer network (IPN) structure on a surface of the hydrogel contact lens.

## Claims

### Claim 1

A manufacturing method for a hydrogel contact lens comprising a hydrogel contact lens substrate and a hydrophilic surface layer having an interpenetrating polymer network (IPN) structure formed on a surface of the hydrogel contact lens substrate, comprising:
a first step of preparing the hydrogel contact lens substrate; and
a second step of immersing the hydrogel contact lens substrate for at least 1 hour in a single surface-modifying solution including 0.05 to 2 wt % of a sodium hyaluronate compound, 0.2 to 10 wt % of a hydrophilic monomer, a crosslinking agent having a content of 0.001 to 0.1 mol per 1 mol of the hydrophilic monomer, 0.001 to 0.5 wt % of an initiator, and a residual content of water,
wherein a physical intermixed layer with the hydrophilic surface layer is formed in the contact lens substrate to have a thickness of 20 nm or more, and
wherein the hydrophilic surface layer having the interpenetrating polymer network (IPN) structure is formed from a single mixture including the sodium hyaluronate compound, the hydrophilic monomer, and the crosslinking agent.

### Claim 2 (depends on 1)

The manufacturing method of claim 1, further comprising:
swelling the hydrogel contact lens substrate that is performed between the first step and the second step.

### Claim 3 (depends on 2)

The manufacturing method of claim 2, wherein the swelling is performed by immersing the hydrogel contact lens substrate in an alcohol solution.