公开(公告)号：US20200324314A1

公开(公告)日：2020-10-15

申请号：US16843989

申请日：2020-04-09

Applicant: Alcon Inc.

Inventor： Newton T. Samuel ,  Yongxing Qiu ,  John Dallas Pruitt ,  Matthew McCollum

IPC: B05D1/18 ,  G02B1/18 ,  C09D5/00 ,  C09D133/02

Abstract: The invention is generally related to a method for producing, in a consistent manner, contact lenses each having an intact durable coating thereon, wherein the coating is a hydrogel coating formed by covalently attached a hydrophilic polymeric material having azetidinium groups onto a base coating of a polyanionic polymer on a contact lens at a relatively low temperature (e.g., from about 40° C. to about 60° C.). The coating temperature for forming a durable hydrogel coating on top of the base coating of a contact lens can be significantly lowered by raising, in situ, the pH (to about 9.5 or higher) of a reactive coating solution which contains the hydrophilic polymeric material having azetidinium groups.

公开(公告)号：US11648583B2

公开(公告)日：2023-05-16

申请号：US16843989

申请日：2020-04-09

Applicant: Alcon Inc.

Inventor： Newton T. Samuel ,  Yongxing Qiu ,  John Dallas Pruitt ,  Matthew McCollum

IPC: B05D1/18 ,  G02B1/18 ,  C09D5/00 ,  C09D133/02 ,  B05D3/02 ,  B05D3/10 ,  G02C7/04

CPC classification number: B05D1/18 ,  B05D3/0209 ,  B05D3/107 ,  C09D5/002 ,  C09D133/02 ,  G02B1/18 ,  B05D2258/00 ,  B05D2401/20 ,  B05D2401/21 ,  B05D2502/00 ,  G02C7/04

Abstract: The invention is generally related to a method for producing, in a consistent manner, contact lenses each having an intact durable coating thereon, wherein the coating is a hydrogel coating formed by covalently attached a hydrophilic polymeric material having azetidinium groups onto a base coating of a polyanionic polymer on a contact lens at a relatively low temperature (e.g., from about 40° C. to about 60° C.). The coating temperature for forming a durable hydrogel coating on top of the base coating of a contact lens can be significantly lowered by raising, in situ, the pH (to about 9.5 or higher) of a reactive coating solution which contains the hydrophilic polymeric material having azetidinium groups.