US4280970A
Expired / Lapsed
US
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Polyoxyethylene grafted membrane materials with grafting links derived from a diisocyanate
Assignee: GELSUB Inc
•
Filing: 1979-01-19
•
Granted: 1981-07-28
•
Expires: 1999-01-19
Abstract
Abstract Membrane forming polymers are converted to hydrophilic polymeric membranes by (a) grafting a polyoxyethylene chain to a membrane forming polymer structure and thereafter forming a membrane; (b) coating a membrane with a polymer to which a polyoxyethylene chain has been grafted; or (c) grafting in situ a polyoxyethylene chain to a formed membrane polymer.
Inventors
- 👤 Robert E. Kesting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:36
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0093; B01D71/00; B01D71/06; B01D71/76; B01D71/82; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/48; C08G18/4833; C08G18/64; C08G18/6484; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40; B01D2323/00; B01D2323/38; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31942; Y10T428/31949; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
28 words
A hydrophilic membrane consisting essentially of the graft copolymer of an active hydrogen containing membrane forming polymer, a diisocyanate grafting link and an active hydrogen containing polyoxyethylene polymer.
Claim 2
Dependent Claim
28 words
A hydrophilic membrane consisting essentially of the graft copolymer of an active hydrogen containing membrane forming polymer, a diisocyanate grafting link and an active hydrogen containing polyoxyethylene polymer.
Claim 3
Dependent Claim
16 words
The membrane of claim 1 wherein the membrane forming copolymer is a cellulosic polymer or nylon.
Claim 4
Dependent Claim
29 words
A hydrophilic membrane comprising a hydrophobic polymer coated with a hydrophilic graft copolymer of a polyoxyethylene polymer, a diisocyanate grafting link and an active hydrogen containing membrane forming polymer.
Claim 5
Dependent Claim
29 words
A hydrophilic membrane comprising a hydrophobic polymer coated with a hydrophilic graft copolymer of a polyoxyethylene polymer, a diisocyanate grafting link and an active hydrogen containing membrane forming polymer.
Claim 6
Dependent Claim
28 words
A hydrophilic film consisting essentially of the graft copolymer of an active hydrogen containing film forming polymer a diisocyanate grafting link and an active hydrogen containing polyoxyethylene polymer.
Claim 7
Dependent Claim
28 words
A hydrophilic film consisting essentially of the graft copolymer of an active hydrogen containing film forming polymer a diisocyanate grafting link and an active hydrogen containing polyoxyethylene polymer.
Claim 8
Dependent Claim
16 words
The film of claim 4 wherein the film forming copolymer is a cellulosic polymer or nylon.
Claim 9
Dependent Claim
29 words
A hydrophilic film comprising a hydrophobic polymer coated with a hydrophilic graft copolymer of a polyoxyethylene polymer a diisocyanate grafting link and an active hydrogen containing film forming polymer.
Claim 10
Dependent Claim
29 words
A hydrophilic film comprising a hydrophobic polymer coated with a hydrophilic graft copolymer of a polyoxyethylene polymer a diisocyanate grafting link and an active hydrogen containing film forming polymer.
Claim 11
Dependent Claim
21 words
A contact lens consisting essentially of a graft copolymer of polyoxyethylene polymer, a diisocyanate grafting link, and a cellulose acetate-butyrate polymer.
Claim 12
Dependent Claim
21 words
A contact lens consisting essentially of a graft copolymer of polyoxyethylene polymer, a diisocyanate grafting link, and a cellulose acetate-butyrate polymer.
Claim 13
Independent Claim
56 words
The method of forming a membrane comprising the steps of grafting an active hydrogen containing polyoxyethylene polymer to an active hydrogen containing membrane forming polymer through a diisocyanate grafting link to produce a graft copolymer, forming a casting solution of the graft copolymer, and casting a membrane of said graft copolymer by a phase inversion process.
Claim 14
Independent Claim
56 words
The method of forming a membrane comprising the steps of grafting an active hydrogen containing polyoxyethylene polymer to an active hydrogen containing membrane forming polymer through a diisocyanate grafting link to produce a graft copolymer, forming a casting solution of the graft copolymer, and casting a membrane of said graft copolymer by a phase inversion process.
Claim 15
Dependent Claim
14 words
The method of claim 8 wherein the membrane forming polymer is a cellulosic polymer.
Claim 16
Dependent Claim
12 words
The method of claim 8 wherein the membrane forming polymer is nylon.
Claim 17
Independent Claim
56 words
The method of forming a film comprising the steps of grafting an active hydrogen containing polyoxyethylene polymer to an active hydrogen containing film forming polymer through a diisocyanate grafting link to produce a graft copolymer, forming a casting solution of the graft copolymer, and casting a film of said graft copolymer by a phase inversion process.
Claim 18
Independent Claim
56 words
The method of forming a film comprising the steps of grafting an active hydrogen containing polyoxyethylene polymer to an active hydrogen containing film forming polymer through a diisocyanate grafting link to produce a graft copolymer, forming a casting solution of the graft copolymer, and casting a film of said graft copolymer by a phase inversion process.
Claim 19
Dependent Claim
14 words
The method of claim 11 wherein the film forming polymer is a cellulosic polymer.
Claim 20
Dependent Claim
12 words
The method of claim 11 wherein the film forming polymer is nylon.
Claim 21
Independent Claim
75 words
The method of forming a membrane comprising the steps of forming a casting solution containing a reactive hydrogen containing membrane forming polymer, a reactive hydrogen containing polyoxyethylene polymer, and a soluble diisocyanate; casting a membrane of said casting solution; and thereafter holding the resulting membrane at a temperature between ambient room temperature and the degradation temperature of the membrane forming polymer to cause the diisocyanate to graft the polyoxyethylene polymer to the membrane forming polymer.
Claim 22
Independent Claim
75 words
The method of forming a membrane comprising the steps of forming a casting solution containing a reactive hydrogen containing membrane forming polymer, a reactive hydrogen containing polyoxyethylene polymer, and a soluble diisocyanate; casting a membrane of said casting solution; and thereafter holding the resulting membrane at a temperature between ambient room temperature and the degradation temperature of the membrane forming polymer to cause the diisocyanate to graft the polyoxyethylene polymer to the membrane forming polymer.
Claim 23
Dependent Claim
18 words
The method of claim 14 wherein the membrane forming polymer is a cellulosic or nylon membrane forming membrane.
Claim 24
Dependent Claim
26 words
The method of claim 14 wherein the diisocyanate is reacted with either the membrane forming polymer or the polyoxyethylene polymer before the casting solution is formed.
Claim 25
Dependent Claim
20 words
The method of claim 16 wherein the diisocyanate is reacted with the polyoxyethylene polymer before the casting solution is formed.
Claim 26
Dependent Claim
18 words
The method of claim 17 wherein the membrane forming polymer is a cellulosic or nylon membrane forming membrane.
Claim 27
Dependent Claim
33 words
The method of claim 17 wherein the cast membrane is held at a temperature of from 50° C. to 150° C. to cause reaction of diisocyanate polyoxyethylene polymer with the membrane forming polymer.
Claim 28
Dependent Claim
18 words
The method of claim 19 wherein the membrane forming polymer is a cellulosic or nylon membrane forming membrane.
Claim 29
Dependent Claim
31 words
The method of claim 17 wherein the polyoxyethylene polymer has two reactive hydrogens, each of which is reacted with a diisocyanate, thereby forming a cross-linking agent for the membrane forming polymer.
Claim 30
Dependent Claim
33 words
The method of claim 18 wherein the cast membrane is held at a temperature of from 50° C. to 150° C. to cause reaction of diisocyanate polyoxyethylene polymer with the membrane forming polymer.
Claim 31
Dependent Claim
18 words
The method of claim 22 wherein the membrane forming polymer is a cellulosic or nylon membrane forming polymer.
Claim 32
Independent Claim
75 words
The method of forming a film comprising the steps of forming a casting solution containing a reactive hydrogen containing film forming polymer, a reactive hydrogen containing polyoxyethylene polymer, and a soluble diisocyanate; casting a film of said casting solution; and thereafter holding the resulting film at a temperature between ambient room temperature and the degradation temperature of the film forming polymer to cause the diisocyanate to graft the polyoxyethylene polymer to the film forming polymer.
Claim 33
Independent Claim
75 words
The method of forming a film comprising the steps of forming a casting solution containing a reactive hydrogen containing film forming polymer, a reactive hydrogen containing polyoxyethylene polymer, and a soluble diisocyanate; casting a film of said casting solution; and thereafter holding the resulting film at a temperature between ambient room temperature and the degradation temperature of the film forming polymer to cause the diisocyanate to graft the polyoxyethylene polymer to the film forming polymer.
Claim 34
Dependent Claim
18 words
The method of claim 24 wherein the film forming polymer is a cellulosic or nylon film forming film.
Claim 35
Dependent Claim
26 words
The method of claim 24 wherein the diisocyanate is reacted with either the film forming polymer or the polyoxyethylene polymer before the casting solution is formed.
Claim 36
Dependent Claim
20 words
The method of claim 26 wherein the diisocyanate is reacted with the polyoxyethylene polymer before the casting solution is formed.
Claim 37
Dependent Claim
18 words
The method of claim 27 wherein the film forming polymer is a cellulosic or nylon film forming film.
Claim 38
Dependent Claim
33 words
The method of claim 27 wherein the cast film is held at a temperature of from 50° C. to 150° C. to cause reaction of diisocyanate polyoxyethylene polymer with the film forming polymer.
Claim 39
Dependent Claim
18 words
The method of claim 29 wherein the film forming polymer is a cellulosic or nylon film forming film.
Claim 40
Dependent Claim
31 words
The method of claim 27 wherein the polyoxyethylene polymer has two reactive hydrogens, each of which is reacted with a diisocyanate, thereby forming a cross-linking agent for the film forming polymer.
Claim 41
Dependent Claim
33 words
The method of claim 28 wherein the cast film is held at a temperature of from 50° C. to 150° C. to cause reaction of diisocyanate polyoxyethylene polymer with the film forming polymer.
Claim 42
Dependent Claim
18 words
The method of claim 32 wherein the film forming polymer is a cellulosic or nylon film forming polymer.
Claim 43
Independent Claim
53 words
The method of producing a hydrophilic membrane comprising coating a hydrophobic membrane with a graft copolymer of a membrane forming, active hydrogen containing polymer to which has been grafted through a diisocyanate grafting link an active hydrogen containing polyoxyethylene polymer; the graft copolymer being soluble in a non-solvent for the hydrophobic membrane polymer.
Claim 44
Independent Claim
53 words
The method of producing a hydrophilic membrane comprising coating a hydrophobic membrane with a graft copolymer of a membrane forming, active hydrogen containing polymer to which has been grafted through a diisocyanate grafting link an active hydrogen containing polyoxyethylene polymer; the graft copolymer being soluble in a non-solvent for the hydrophobic membrane polymer.
Claim 45
Independent Claim
28 words
The method of forming a hydrophilic contact lens blank comprising grafting polyoxyethylene polymer to cellulosic lens forming polymer and forming a contact lens blank from said grafted polymer.
Claim 46
Independent Claim
28 words
The method of forming a hydrophilic contact lens blank comprising grafting polyoxyethylene polymer to cellulosic lens forming polymer and forming a contact lens blank from said grafted polymer.
Claim 47
Dependent Claim
13 words
The method of claim 35 wherein the lens forming polymer is cellulose acetate-butyrate.
Claim 48
Dependent Claim
20 words
The method of claim 36 wherein the polyoxyethylene polymer is grafted through a diisocyanate link to the cellulose acetate-butyrate polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |