US4300820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water absorptive composition
Assignee: Kendall Co
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Filing: 1980-10-27
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Granted: 1981-11-17
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Expires: 2000-10-27
Abstract
Abstract A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form a hydrogel is made by blending (1) 40 to 98% by weight of water-soluble polymer of a vinyl lactam having the structure ##STR1## in which X represents an alkylene bridge having three to five carbon atoms or a copolymer thereof with 1 to 90 mole percent of a copolymerizable monomer containing a polymerizable ethylenic unsaturation; and (2) 2 to 60% by weight of a water-insoluble copolymer formed of 50% to 90% by weight based on the total copolymer of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and 0 to 50% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.
Inventors
- 👤 Kishore R. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/062; C09J133/064; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61L15/585; A61L17/00; A61L17/14; A61L17/145; A61L29/00; A61L29/08; A61L29/085; A61L29/14; A61L29/145; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C08; C08L; C08L39/00; C08L39/04; C08L39/06; C09J139/00; C09J139/04; C09J139/06; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C08L2666/00; C08L2666/02; C08L2666/04; C09J2301/00; C09J2301/30; C09J2301/302
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
125 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of N-vinyl-2-pyrrolidone, having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 50 to 90% by weight, based on the total weight of the copolymer, of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and from 15 to 45% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.
Claim 2
Dependent Claim
125 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of N-vinyl-2-pyrrolidone, having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 50 to 90% by weight, based on the total weight of the copolymer, of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and from 15 to 45% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.
Claim 3
Dependent Claim
100 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of N-vinyl-2-pyrrolidone, having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 88 to 90% by weight, based on the total weight of the copolymer, of methyl methacrylate and 10 to 12% by weight of 2-acrylamido-2-methyl propanesulfonic acid.
Claim 4
Dependent Claim
100 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of N-vinyl-2-pyrrolidone, having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 88 to 90% by weight, based on the total weight of the copolymer, of methyl methacrylate and 10 to 12% by weight of 2-acrylamido-2-methyl propanesulfonic acid.
Claim 5
Dependent Claim
62 words
A composition as claimed in claim 1 in which said water-insoluble copolymer consists essentially of 55 to 70% by weight, based on the total weight of the polymer, of a monomer selected from the group consisting of methyl methacrylate, styrene, and 2-ethylhexyl acrylate, 2 to 12% by weight of acrylic acid, and methacrylamide in an amount from 25 to 43% by weight.
Claim 6
Dependent Claim
50 words
A composition as claimed in claim 1 in which said water-insoluble copolymer consists essentially of 55 to 80% by weight of n-butyl methacrylate, based on the total weight of the copolymer, 2 to 12% by weight of acrylic acid, and methacrylamide in an amount from 15 to 35% by weight.
Claim 7
Dependent Claim
49 words
A composition as claimed in claim 1 in which said water-insoluble copolymer consists essentially of 50 to 78% by weight, based on the total weight of the copolymer, of n-butyl methacrylate, 2 to 12% by weight of acrylic acid, and from 20 to 35% by weight of p-styrene sulfonamide.
Claim 8
Dependent Claim
49 words
A composition as claimed in claim 1 in which said water-insoluble copolymer consists essentially of 55 to 70% by weight, based on the total weight of the copolymer, of n-butyl methacrylate, 2 to 12% by weight of acrylic acid, and from 25 to 43% by weight of hydroxyethyl methacrylate.
Claim 9
Dependent Claim
167 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of a vinyl lactam having the structure ##STR7## in which X represents an alkylene bridge having three to five carbon atoms, or a water-soluble copolymer thereof with 1 to 90 mole percent of copolymerizable monomer containing a polymerizable ethylenic unsaturation, said polymer or copolymer having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 50 to 90% by weight, based on the total weight of the copolymer, of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and from 15 to 45% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.
Claim 10
Dependent Claim
167 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of a vinyl lactam having the structure ##STR7## in which X represents an alkylene bridge having three to five carbon atoms, or a water-soluble copolymer thereof with 1 to 90 mole percent of copolymerizable monomer containing a polymerizable ethylenic unsaturation, said polymer or copolymer having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-insoluble copolymer consisting essentially of 50 to 90% by weight, based on the total weight of the copolymer, of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and from 15 to 45% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.
Claim 11
Dependent Claim
142 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of a vinyl lactam having the structure ##STR8## in which X represents an alkylene bridge having three to five carbon atoms, or a water-soluble copolymer thereof with 1 to 90 mole percent of copolymerizable monomer containing a polymerizable ethylenic unsaturation, said polymer or copolymer having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-soluble copolymer consisting essentially of 88 to 90% by weight, based on the total weight of the copolymer, of methyl methacrylate and 10 to 12% by weight of 2-acrylamido-2-methyl propanesulfonic acid.
Claim 12
Dependent Claim
142 words
A composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form an optically clear hydrogel consisting essentially of an optically clear blend of (1) 40 to 98% by weight, based on the total weight of the blend, of a water-soluble polymer of a vinyl lactam having the structure ##STR8## in which X represents an alkylene bridge having three to five carbon atoms, or a water-soluble copolymer thereof with 1 to 90 mole percent of copolymerizable monomer containing a polymerizable ethylenic unsaturation, said polymer or copolymer having a molecular weight from 10,000 to 1,000,000 and (2) 2 to 60% by weight of a water-soluble copolymer consisting essentially of 88 to 90% by weight, based on the total weight of the copolymer, of methyl methacrylate and 10 to 12% by weight of 2-acrylamido-2-methyl propanesulfonic acid.
Claim 13
Dependent Claim
16 words
A composition as claimed in claims 7 or 8 in which said vinyl lactam is N-vinyl-2-pyrrolidone.
Claim 14
Dependent Claim
12 words
A soft contact lens made of the composition claimed in claim 7.
Claim 15
Dependent Claim
13 words
A burn and wound dressing made of the composition claimed in claim 7.
References Cited (Backward Citations)
US2658045A
Cited
US2901457A
Cited
US3159539A
Cited
US3511659A
Cited
US3700761A
Cited
US3803093A
Cited
US3728317A
Cited
US3807398A
Cited
US3933766A
Cited
US3975570A
Cited
US4067839A
Cited
US3937680A
Cited
US3949021A
Cited
US4018853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |