Patent US2323018A successfully refreshed from Google Patents.
US4359558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane diacrylate compositions
Assignee: Tyndale Plains Hunter Ltd
•
Filing: 1980-11-12
•
Granted: 1982-11-16
•
Expires: 2000-11-12
Abstract
Abstract Polyurethane diacrylate compositions are obtained by reacting a diacrylate in the presence of from about 30 to about 95 weight percent of a hydrophilic polyurethane resin. The resulting products will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.
Inventors
- 👤 Francis E. Gould
- 👤 Christian W. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; A61L15/42; A61L15/60; A61L17/00; A61L17/04; A61L27/00; A61L27/14; A61L27/16; B; B01; B01D; B01D71/00; B01D71/06; B01D71/54; B01D71/76; B01D71/78; C; C08; C08F; C08F283/00; C08F283/006; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; A61F; A61F2/00; A61F2/0004; C08G2210/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/489; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S528/00; Y10S528/904
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
102 words
A hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species; is dimensionally stable and exhibits memory; obtained by the reaction of from about 5 to about 70 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a whole number, such that the average molecular weight of said diacrylate is no greater than 1588; in the presence of from about 95 to about 30 weight percent of a hydrophilic polyurethane resin.
Claim 2
Dependent Claim
102 words
A hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species; is dimensionally stable and exhibits memory; obtained by the reaction of from about 5 to about 70 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a whole number, such that the average molecular weight of said diacrylate is no greater than 1588; in the presence of from about 95 to about 30 weight percent of a hydrophilic polyurethane resin.
Claim 3
Dependent Claim
13 words
The polyurethane diacrylate composition of claim 1 wherein said diacrylate is a dimethacrylate.
Claim 4
Dependent Claim
22 words
The polyurethane diacrylate composition of claim 1 wherein said diacrylate is from about 10 to about 45 weight percent of said composition.
Claim 5
Dependent Claim
14 words
The polyurethane diacrylate composition of claim 1 wherein said diacrylate is diethylene glycol diacrylate.
Claim 6
Dependent Claim
23 words
The polyurethane diacrylate composition of claim 2 wherein said diacrylate is a polyethylene glycol dimethacrylate having an average molecular weight of about 1586.
Claim 7
Dependent Claim
22 words
The polyurethane diacrylate composition of claim 1 wherein said diacrylate is a polyethylene diacrylate having an average molecular weight of about 508.
Claim 8
Dependent Claim
18 words
The polyurethane diacrylate composition of claim 1 wherein said diacrylate is about 20 weight percent of said composition.
Claim 9
Dependent Claim
14 words
The polyurethane diacrylate composition of claim 7 wherein said diacrylate is diethylene glycol diacrylate.
Claim 10
Dependent Claim
20 words
The polyurethane diacrylate composition of claim 1 wherein said polyurethane is derived from a mixture of polyols and a diisocyanate.
Claim 11
Dependent Claim
15 words
The polyurethane diacrylate composition of claim 9 wherein one of said polyols is diethylene glycol.
Claim 12
Dependent Claim
28 words
The polyurethane diacrylate composition of claim 9 wherein one of said polyols is a polyethylene glycol characterized by an average molecular weight between about 1450 and about 7500.
Claim 13
Dependent Claim
29 words
The polyurethane diacrylate composition of claim 9 wherein said mixture of polyols is a mixture of diethylene glycol and polyethylene glycol having an average molecular weight of about 7500.
Claim 14
Dependent Claim
16 words
The polyurethane diacylate composition of claim 1 which has been molded to form a desired shape.
Claim 15
Independent Claim
31 words
A method of preparing a hydrophilic polyurethane diacrylate composition which comprises reacting a diacrylate in the presence of from about 30 to about 95 weight percent of a hydrophilic polyurethane resin.
Claim 16
Independent Claim
31 words
A method of preparing a hydrophilic polyurethane diacrylate composition which comprises reacting a diacrylate in the presence of from about 30 to about 95 weight percent of a hydrophilic polyurethane resin.
Claim 17
Dependent Claim
18 words
The method of claim 14 wherein the reaction of said diacrylate is initiated by an isopropyl percarbonate catalyst.
References Cited (Backward Citations)
US3297745A
Cited
US3931123A
Cited
US3975350A
Cited
US4056496A
Cited
GB1450906A
Cited
US4117184A
Cited
US4116786A
Cited
US4250248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |