Contact lens with a hydrogel coating thereon
The invention is related to a cost-effective method for making a coated contact lens having a hydrogel coating thereon. A method of the invention involves heating a contact lens precursor having carboxylic acid groups on and/or near its surface in an aqueous solution in the presence of a hydrophilic copolymer that comprises monomeric units of (a) at least one epoxy-containing vinylic monomer, (b) at least one amino-containing vinylic monomer having a primary or secondary amino group, (c) at least one polyethyleneglycol-containing vinylic monomer, and (d) at least one phosphorylcholine-containing vinylic monomer, at a temperature from about 100° C. to about 140° C. for at least 30 minutes, thereby forming a hydrogel coating on the contact lens precursor. Such a method can be advantageously implemented directly in a sealed lens package during autoclave.
1 . A method for making coated contact lenses, comprising the steps of:
(1) obtaining a contact lens precursor which has a concave surface and an opposite convex surface and comprises a lens bulk material and carboxylic acid groups on and/or near the anterior and posterior surfaces;
(2) immersing the contact lens precursor in an aqueous solution in a container, wherein the aqueous solution comprises from about 0.01% to about 5.0% by weight of at least one hydrophilic copolymer that is a statistical copolymer of formula (I)
in which
T′ and T″ independent of each other are H or a terminal group; each R 0 independent one another is H or CH 3 ; each R 0 ′ independent of one another is H or C 1 -C 4 alkyl; B 1 , B 2 and B 3 independent of one another are O or NR′; R′ is H or C 1 -C 4 alkyl; D 1 , D 2 and D 3 independent of one another are a C 1 -C 12 alkylene divalent radical; D 0 is a C 1 -C 12 alkylene divalent radical or a divalent radical of -D 4 -O-D 5 -B 4 —CH 2 —; B 4 is —O— or
D 4 is a C 1 -C 12 alkylene divalent radical; D 5 is a C 2 -C 6 alkylene divalent radical or a divalent radical of
D 6 and D 7 independent of each other is a C 2 -C 6 alkylene divalent radical; d1 is zero, 1 or 2; PEG is a polyethyleneglycol group of
in which R″ is H or C 1 -C 4 alkyl; t2 is an integer from 3 to 100; PC is a zwitterionic group of
in which t1 is an integer of 1 to 5 and 1 R, 2 R and 3 R independently of one another are C 1 -C 8 alkyl or C 1 -C 8 hydroxyalkyl; a, b, c, and d independent of one another are an integer of from 5 to 100, wherein (a+c)/(a+b+c+d)≤0.40 and a/c is from 2.5 to 0.4; and
(3) heating the aqueous solution with the contact lens precursor therein at a temperature of from about 100° C. to about 140° C. for at least 30 minutes to form a coated contact lens having a hydrogel coating thereon, wherein the hydrogel coating is covalently attached onto the anterior and posterior surfaces through linkages each formed between one carboxylic acid group and one epoxy group, wherein the hydrogel coating comprises a crosslinked polymeric material comprising polymer chains derived from the hydrophilic copolymer,
wherein the contact lens has a water-break-up time (WBUT) of at least 10 seconds.
2 . The method of claim 1 , wherein the contact lens precursor is composed of a lens bulk material that has carboxylic acid groups on and/or near the surfaces of the lens bulk material.
3 . The method of claim 2 , wherein the lens bulk material is obtained by polymerizing a polymerizable composition comprising from about 0.1% to about 10% by weight of a vinylic monomer which further comprises at least one carboxylic acid group.
4 . The method of claim 2 , wherein the lens bulk material has been subjected to at least one post-curing surface treatment to have the carboxylic acid groups on and/or near the surfaces of the lens bulk material.
5 . The method of claim 1 , wherein the contact lens precursor comprises a lens bulk material and a layer of at least one polymeric material having carboxylic acid groups thereon.
6 . The method of claim 5 , wherein said at least one polymeric material having the carboxylic acid groups comprises a homo- or copolymer of acrylic acid or C 1 -C 3 alkylacrylic acid.
7 . The method of claim 1 , where the step of heating is performed by autoclaving the contact lens precursor with the carboxylic acid groups thereon immersed in the aqueous solution which is a packaging solution in a sealed lens package at a temperature of from about 115° C. to about 125° C. for approximately 30-90 minutes.
8 . The method of claim 7 , wherein in formula (I), (a+c)/(a+b+c+d)≤0.35.
9 . The method of claim 8 , wherein in formula (I), a/c is from 2 to 0.5.
10 . The method of claim 8 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.
11 . A contact lens, comprising: an anterior surface, an opposite posterior surface, and a layered structural configuration from the anterior surface to the posterior surface, wherein the layered structural configuration comprises an outer anterior surface hydrogel layer, an inner layer, and an outer posterior surface hydrogel layer, wherein the inner layer comprises a lens bulk material and has carboxylic acid groups on and/or near the surfaces of the inner layer,
wherein the outer anterior surface hydrogel layer and the outer posterior surface hydrogel layer comprise a crosslinked polymeric material comprising polymer chains derived from a hydrophilic copolymer that is a statistical copolymer of formula (I)
in which
T′ and T″ independent of each other are H or a terminal group; each R 0 independent one another is H or CH 3 ; each R 0 ′ independent of one another is H or C 1 -C 4 alkyl; B 1 , B 2 and B 3 independent of one another are O or NR′; R′ is H or C 1 -C 4 alkyl; D 1 , D 2 and D 3 independent of one another are a C 1 -C 12 alkylene divalent radical; D 0 is a C 1 -C 12 alkylene divalent radical or a divalent radical of -D 4 -O-D 5 -B 4 —CH 2 —; B 4 is —O— or
D 4 is a C 1 -C 12 alkylene divalent radical; D 5 is a C 2 -C 6 alkylene divalent radical or a divalent radical of
D 6 and D 7 independent of each other is a C 2 -C 6 alkylene divalent radical; d1 is zero, 1 or 2; PEG is a polyethyleneglycol group of
in which R″ is H or C 1 -C 4 alkyl; t2 is an integer from 3 to 100; PC is a zwitterionic group of
in which t1 is an integer of 1 to 5 and 1 R, 2 R and 3 R independently of one another are C 1 -C 8 alkyl or C 1 -C 8 hydroxyalkyl; a, b, c, and d independent of one another are an integer of from 5 to 100, wherein (a+c)/(a+b+c+d)≤0.40 and a/c is from 2.5 to 0.4, and
wherein the outer anterior surface hydrogel layer and the outer posterior surface hydrogel layer are covalently attached onto the inner layer through linkages each formed between one carboxylic acid group and one epoxy group, wherein the contact lens has a water-break-up time (WBUT) of at least 10 seconds.
12 . The contact lens of claim 11 , wherein the inner layer is composed of a lens bulk material that has carboxylic acid groups on and/or near the surfaces of the bulk material.
13 . The contact lens of claim 11 , wherein the inner layer comprises a lens bulk material and a layer of at least one polymeric material having carboxylic acid groups, wherein said at least one polymeric material having the carboxylic acid groups comprises a homo- or copolymer of acrylic acid or C 1 -C 3 alkylacrylic acid.
14 . The contact lens of claim 11 , wherein in formula (I), (a+c)/(a+b+c+d)≤0.35.
15 . The contact lens of claim 11 , wherein in formula (I), a/c is from 2 to 0.5.
16 . The contact lens of claim 11 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.
17 . The contact lens of claim 12 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.
18 . The contact lens of claim 13 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.
19 . The contact lens of claim 14 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.
20 . The contact lens of claim 15 , wherein the lens bulk material is (i) a hard plastic material, (ii) a rigid gas permeable lens material, (iii) a non-silicone hydrogel material, or (iv) a silicone hydrogel material, or wherein the lens bulk material consists essentially of (a) a central optical zone that is essentially made of a rigid gas permeable lens material and surrounded by a peripheral zone that is essential made of a silicone hydrogel material or a non-silicone hydrogel material, or (b) a 3-dimensional article and a silicone hydrogel material or a non-silicone hydrogel material, wherein the 3-dimensional article is made of a non-hydrogel material and has a 3-dimensional size smaller than that of the preformed embedded contact lens so that the 3-dimensional article is completely embedded within the silicone hydrogel material or the non-silicone hydrogel material.