US3935367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of rendering surfaces nonfogging and resulting articles
Assignee: Arthur D Little Inc
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Filing: 1972-11-24
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Granted: 1976-01-27
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Expires: 1992-11-24
Abstract
Abstract A method for treating a surface of a substrate to render it nonfogging and the resulting article formed by the treatment. A thin film coating of a block copolymer containing alternating blocks of polyurethane and a hydrophilic copolyacrylic is adhered to the surface to be made nonfogging. The copolyacrylic is a copolymer of a hydroxy substituted acrylate and an ethylenically unsaturated acid such as acrylic acid. By varying the weight ratio of polyetherurethane/copolyacrylic it is possible to vary the flexibility of the coating and hence to widen the range of substrates to which the treatment is applicable, e.g., from flexible wrapping material to rigid mirrors.
Inventors
- 👤 Richard E. Merrill
- 👤 Arthur A. Massucco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/86; B; B05; B05D; B05D3/00; B05D3/06; B05D3/061; B05D3/062; B05D3/063; B05D5/00; B05D5/04; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/1077; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C03C17/322; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601; Y10T428/31605; Y10T428/31645; Y10T428/31649; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
73 words
A method for rendering a surface of a substrate nonfogging, comprising the step of adhering to said surface a thin transparent film of a block copolymer characterized as containing alternating blocks of a hydrophilic polyetherurethane and of a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
Claim 2
Independent Claim
73 words
A method for rendering a surface of a substrate nonfogging, comprising the step of adhering to said surface a thin transparent film of a block copolymer characterized as containing alternating blocks of a hydrophilic polyetherurethane and of a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1 wherein said adhering step comprises forming a solution of said block copolymer and applying said solution to said surface.
Claim 4
Dependent Claim
22 words
A method in accordance with claim 2 including the step of adding a crosslinking agent for said block copolymer to said solution.
Claim 5
Dependent Claim
27 words
A method in accordance with claim 1 wherein said adhering step comprises fixing a preformed film of said block copolymer to said surface through a transparent adhesive.
Claim 6
Dependent Claim
14 words
A method in accordance with claim 4 wherein said adhesive is a polymerized-in-place monomer.
Claim 7
Dependent Claim
33 words
A method in accordance with claim 1 wherein said polyetherurethane blocks in said block copolymer are formed by reacting a polyethylene glycol having a molecular weight of at least 2000 with a diisocyanate.
Claim 8
Dependent Claim
37 words
A method in accordance with claim 6 including the step of adding a chain extender to said polyethylene glycol whereby said ratio of polyetherurethane/polyacrylic is increased and the flexibility of said film of block copolymer is increased.
Claim 9
Dependent Claim
17 words
A method in accordance with claim 1 wherein said hydroxy-substituted acrylate in said copolymer is 2-hydroxyethyl methacrylate.
Claim 10
Dependent Claim
17 words
A method in accordance with claim 1 wherein said copolymer comprises copolymerized 2-hydroxyethyl methacrylate and acrylic acid.
Claim 11
Dependent Claim
20 words
A method in accordance with claim 1 wherein said thin film ranges in thickness between about 0.25 and 10 mils.
Claim 12
Dependent Claim
30 words
A method in accordance with claim 1 wherein said ethylenically unsaturated acid in said copolymer is present in an amount up to about 10% by weight of said hydroxy-substituted acrylate.
Claim 13
Dependent Claim
76 words
An article of manufacture comprising a substrate having on at least one surface thereof a nonfogging, transparent coating comprising a thin transparent film of a block copolymer, the blocks of which are characterized as being a hydrophilic polyetherurethane alternating with a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
Claim 14
Dependent Claim
76 words
An article of manufacture comprising a substrate having on at least one surface thereof a nonfogging, transparent coating comprising a thin transparent film of a block copolymer, the blocks of which are characterized as being a hydrophilic polyetherurethane alternating with a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
Claim 15
Dependent Claim
12 words
An article in accordance with claim 12 wherein said substrate is glass.
Claim 16
Dependent Claim
18 words
An article in accordance with claim 13 wherein said glass is in the form of an optical lens.
Claim 17
Dependent Claim
14 words
An article in accordance with claim 13 wherein said glass is a contoured window.
Claim 18
Dependent Claim
13 words
An article in accordance with claim 12 wherein said substrate is a mirror.
Claim 19
Dependent Claim
13 words
An article in accordance with claim 12 wherein said substrate is a plastic.
Claim 20
Dependent Claim
13 words
An article in accordance with claim 12 wherein said substrate is a metal.
Claim 21
Dependent Claim
12 words
An article in accordance with claim 12 wherein said substrate is flexible.
Claim 22
Dependent Claim
15 words
An article in accordance with claim 19 wherein said flexible substrate is transparent packaging film.
Claim 23
Dependent Claim
16 words
An article in accordance with claim 12 further characterized in that said block copolymer is crosslinked.
Claim 24
Dependent Claim
33 words
An article in accordance with claim 12 wherein said polyetherurethane blocks in said block copolymer are formed by reacting a polyethylene glycol having a molecular weight of at least 2000 with a diisocyanate.
Claim 25
Dependent Claim
28 words
An article in accordance with claim 22 wherein the polyether chain in said polyetherurethane block is extended whereby the flexibility of said film of block copolymer is increased.
Claim 26
Dependent Claim
17 words
An article in accordance with claim 12 wherein said hydroxy-substituted acrylate in said copolymer is 2-hydroxyethyl methacrylate.
Claim 27
Dependent Claim
17 words
An article in accordance with claim 12 wherein said copolymer comprises copolymerized 2-hydroxyethyl methacrylate and acrylic acid.
Claim 28
Dependent Claim
20 words
An article in accordance with claim 12 wherein said thin film ranges in thickness between about 0.25 and 10 mils.
Claim 29
Dependent Claim
30 words
An article in accordance with claim 12 wherein said ethylenically unsaturated acid in said copolymer is present in an amount up to about 10% by weight of said hydroxy-substituted acrylate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |