US4548983A
Expired / Lapsed
US
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Method of manufacturing shaped article of hydrogel
Assignee: Toray Industries Inc
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Filing: 1984-06-21
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Granted: 1985-10-22
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Expires: 2004-06-21
Abstract
Abstract A method for the manufacture of shaped article of hydrogel is provided. This shaped article of hydrogel is obtained by the polymerization in a mold of a mixture comprising: A. an alkylene glycol mono(meth)acrylate or a monomer mixture consisting preponderantly of an alkylene glycol mono(meth)acrylate, B. a polymer synthesized from a component A and possessing a polymerizable double bond in the molecular unit thereof, C. a water-soluble dipolar aprotic solvent, and D. at least one member selected from the group consisting of (a) water-soluble organic acids, (b) surface active agents, and (c) water-soluble organic substances which are poor solvents or non-solvents of the component B, and having the weight ratio of the component A to the component B in the range of 45:55 to 20:80.
Inventors
- 👤 Mitsuru Yokota
- 👤 Shuji Fujioka
- 👤 Tsutomu Goshima
- 👤 Hideki Kenjo
- 👤 Kazushige Komaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:06
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F265/00; C08F265/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
A method of manufacturing a shaped article of hydrogel by: (1) forming a polymerizable mixture consisting essentially of: (A) an alkylene glycol mono(meth)acrylate or a monomer mixture consisting primarily of an alkylene glycol mono(meth)acrylate, (B) a preformed copolymer possessing a polymerizable double bond in the molecular structure thereof and formed by reacting: (a) a (co)polymer of an alkylene glycol mono(meth)acrylate or of a monomer mixture consisting primarily of an alkylene glycol mono(meth)acrylate, said (co)polymer possessing a hydroxyl group or a terminal carboxyl group, with (b) a monomer possessing a polymerizable double bond and a functional group which reacts with said hydroxyl group or carboxyl group, (C) a water-soluble dipolar aprotic solvent, and (D) at least one member selected from the group consisting of (a) water-soluble organic acids, (b) surface active agents, and (c) water-soluble organic substances which are poor solvents or non-solvents for the preformed copolymer (B); the weight ratio of the component A to the preformed copolymer (B) in said polymerizable mixture being in the range of 45:55 to 20:80; and (2) polymerizing the polymerizable mixture (1) in a mold.
Claim 2
Independent Claim
181 words
A method of manufacturing a shaped article of hydrogel by: (1) forming a polymerizable mixture consisting essentially of: (A) an alkylene glycol mono(meth)acrylate or a monomer mixture consisting primarily of an alkylene glycol mono(meth)acrylate, (B) a preformed copolymer possessing a polymerizable double bond in the molecular structure thereof and formed by reacting: (a) a (co)polymer of an alkylene glycol mono(meth)acrylate or of a monomer mixture consisting primarily of an alkylene glycol mono(meth)acrylate, said (co)polymer possessing a hydroxyl group or a terminal carboxyl group, with (b) a monomer possessing a polymerizable double bond and a functional group which reacts with said hydroxyl group or carboxyl group, (C) a water-soluble dipolar aprotic solvent, and (D) at least one member selected from the group consisting of (a) water-soluble organic acids, (b) surface active agents, and (c) water-soluble organic substances which are poor solvents or non-solvents for the preformed copolymer (B); the weight ratio of the component A to the preformed copolymer (B) in said polymerizable mixture being in the range of 45:55 to 20:80; and (2) polymerizing the polymerizable mixture (1) in a mold.
Claim 3
Dependent Claim
62 words
A method according to claim 1, wherein said monomer mixture consisting primarily of an alkylene glycol mono(meth)acrylate of the component A has as its major component an alkylene glycol mono(meth)acrylate and as its minor component at least one monomer selected from the group consisting of (meth)acrylic acid alkyl esters, (meth)acrylic acid, monoesters of single-terminal alkoxy polyhydric alcohols with (meth)acrylic acid, and (meth)acrylamides.
Claim 4
Dependent Claim
58 words
A method according to claim 1, wherein said monomer mixture consisting primarily of an alkylene glycol (meth)acrylate of the component A has as its major component an alkylene glycol mono(meth)acrylate and as its minor component at least one monomer selected from the group consisting of (meth)acrylic acid, monoesters of single-terminal alkoxy polyhydric alcohols with (meth)acrylic acid, and (meth)acrylamides
Claim 5
Dependent Claim
48 words
A method according to claim 1, wherein said alkylene glycol mono(meth)acrylate is represented by the following formula: ##STR4## wherein R stands for a hydrogen atom or a methyl group, m for 2, 3 or 4, and n for an integer falling in the range of 1 to 30.
Claim 6
Dependent Claim
36 words
A method according to claim 1, wherein said water-soluble dipolar aprotic solvent of the component C is at least one member selected from the group consisting of dimethyl sulfoxide, N,N-dimethyl acetamide, N,N-dimethyl formamide and N-methyl pyrrolidone.
Claim 7
Dependent Claim
26 words
A method according to claim 1, wherein said weight ratio of the component A to the component B falls in the range of 45:55 to 30:70.
Claim 8
Dependent Claim
36 words
A method according to claim 1, wherein the ratio of the amount of the component C to the combined amount of the components A, B and C is in the range of to 85% by weight.
Claim 9
Dependent Claim
33 words
A method according to claim 1, wherein the ratio of the amount of the component D to the combined amount of the mixture is in the range of 0.01 to 10% by weight.
Claim 10
Dependent Claim
18 words
A method according to claim 1, wherein said mixture further comprises a crosslinking agent and a polymerization initiator.
Claim 11
Dependent Claim
63 words
A method according to claim 1, wherein said polymerization is followed by a step of immersing the mold in a mixed solution consisting of water and a water-soluble organic solvent thereby allowing the resultant shaped article of hydrogel to swell to a size falling in the range of 1.0 to 1.8 times the internal size of the mold and separate from the mold.
Claim 12
Dependent Claim
29 words
A method according to claim 10, wherein said shaped article of hydrogel is caused to swell to a size 1.05 to 1.6 times the internal size of the mold.
Claim 13
Dependent Claim
19 words
A method according to claim 1, wherein the preformed copolymer (B) contains 1-40 double bonds per 1,000 monomer units.
References Cited (Backward Citations)
US3575946A
Cited
US4379864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |