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US4367327A
Expired / Lapsed
US
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Breathable, non-porous polyurethane film prepared from a low molecular weight difunctional compound, a polyethylene glycol and a diisocyanate
Assignee: Shirley Institute
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Filing: 1981-07-21
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Granted: 1983-01-04
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Expires: 2001-07-21
Abstract
Abstract Clothing weatherproofed by being coated with plastics material of low permeability to water vapor is uncomfortable to wear. The present invention provides a breathable polyurethane film for coating on fabrics to make them waterproof. The film comprises a hard segment formed by reaction of a low molecular weight difunctional compound with excess diisocyanate to form a prepolymer and a soft segment provided by polyethylene glycol with which the prepolymer is reacted in a stoichiometric amount. If desired the film can be formed by reacting the polyethylene glycol with excess diisocyanate to form a prepolymer which is then reacted with a stoichiometric amount of a low molecular weight difunctional compound. The mechanical properties of the film can be improved by cross linking with a cross linking agent such as a triisocyanate.
Inventors
- 👤 James R. Holker
- 👤 Roy Jeffries
- 👤 George R. Lomax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/65; C08G18/66; C08G18/6666; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8016; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
75 words
A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, the polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the film forming constituents, and said polyethylene glycol having an average molecular weight not exceeding 2000.
Claim 2
Dependent Claim
75 words
A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, the polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the film forming constituents, and said polyethylene glycol having an average molecular weight not exceeding 2000.
Claim 3
Dependent Claim
69 words
A film as claimed in claim 1 produced by reacting a low molecular weight difunctional compound, with an excess of a diisocyanate to form a prepolymer and subsequently reacting the prepolymer with the stoichiometric amount of a polyethylene glycol, the low molecular weight difunctional compound being one which provides a hard segment in the film and the polyethylene glycol being one which provides a soft segment in the film.
Claim 4
Dependent Claim
69 words
A film as claimed in claim 1 produced by reacting a polyethylene glycol with an excess of a diisocyanate to form a prepolymer and subsequently reacting the prepolymer with the stoichiometric amount of a low molecular weight difunctional compound, the low molecular weight difunctional compound being one which provides a hard segment in the film and the polyethylene glycol being one which provides a soft segment in the film.
Claim 5
Dependent Claim
24 words
A film as claimed in claim 1 produced by mixing together the low molecular weight difunctional compound and the polyethylene glycol and the diisocyanate.
Claim 6
Dependent Claim
22 words
A film as claimed in claim 4, wherein the low molecular weight difunctional compound and the polyethylene glycol are of different reactivity.
Claim 7
Dependent Claim
21 words
A film as claimed in claim 1, wherein the low molecular weight difunctional compound has a molecular weight not exceeding 200.
Claim 8
Dependent Claim
21 words
A film as claimed in claim 1, wherein the low molecular weight difunctional compound is a diol, a diamine or dihydrazide.
Claim 9
Dependent Claim
27 words
A film as claimed in claim 1, wherein the hard segment is formed by reaction of excess diisocyanate with two or more low molecular weight difunctional compounds.
Claim 10
Dependent Claim
18 words
A film as claimed in claim 1, wherein the polyethylene glycol has an average molecular weight above 400.
Claim 11
Dependent Claim
19 words
A film as claimed in claim 1, wherein the polyethylene glycol has an average molecular weight not exceeding 1500.
Claim 12
Dependent Claim
21 words
A film as claimed in claim 10, wherein the polyethylene glycol has an average molecular weight of from 600 to 1000.
Claim 13
Dependent Claim
31 words
A film as claimed in claim 1, wherein the amount of polyethylene glycol present is from 30 to 40% by weight based on the total weight of the film forming constituents.
Claim 14
Dependent Claim
22 words
A film as claimed in claim 1, wherein the hard segment is formed from two or more low molecular weight difunctional compounds.
Claim 15
Dependent Claim
23 words
A film as claimed in claim 1, wherein the soft segment is formed from two or more polyethylene glycols of different molecular weight.
Claim 16
Dependent Claim
12 words
A film as claimed in claim 1, wherein the diisocyanate is 4,4'-diisocyanatodicyclohexylmethane.
Claim 17
Dependent Claim
82 words
A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the film forming constituents, said polyethylene glycol having an average molecular weight not exceeding 2000, and wherein said polyurethane polymer is cross linked.
Claim 18
Dependent Claim
82 words
A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the film forming constituents, said polyethylene glycol having an average molecular weight not exceeding 2000, and wherein said polyurethane polymer is cross linked.
Claim 19
Dependent Claim
29 words
A film as claimed in claim 16, wherein cross linking is effected by addition of a cross linking agent to a solution of the polymer before casting the film.
Claim 20
Dependent Claim
15 words
A film as claimed in claim 17 wherein the cross linking agent is a triisocyanate.
Claim 21
Dependent Claim
11 words
Fabric consisting of a breathable film as claimed in claim 1.
Claim 22
Dependent Claim
11 words
Fabric coated with a breathable film as claimed in claim 1.
Claim 23
Dependent Claim
102 words
A process for preparing a fabric consisting of a breathable non-porous polyurethane film comprising reacting a reaction mixture consisting of a diisocyanate, a low molecular weight difunctional compound to provide hard segments in said film, and a polyethylene glycol having an average molecular weight not exceeding 2000 to provide soft segments in said film, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the reaction mixture, to produce a breathable non-porous polyurethane film block copolymer, and forming said block copolymer into a fabric consisting of said breathable non-porous polyurethane film.
Claim 24
Dependent Claim
102 words
A process for preparing a fabric consisting of a breathable non-porous polyurethane film comprising reacting a reaction mixture consisting of a diisocyanate, a low molecular weight difunctional compound to provide hard segments in said film, and a polyethylene glycol having an average molecular weight not exceeding 2000 to provide soft segments in said film, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the reaction mixture, to produce a breathable non-porous polyurethane film block copolymer, and forming said block copolymer into a fabric consisting of said breathable non-porous polyurethane film.
Claim 25
Dependent Claim
14 words
A process as claimed in claim 21, further comprising cross linking said polyurethane polymer.
Claim 26
Dependent Claim
106 words
A process for preparing a fabric coated with a breathable non-porous polyurethane film comprising reacting a reaction mixture consisting of a diisocyanate, a low molecular weight difunctional compound to provide hard segments in said film, and a polyethylene glycol having an average molecular weight not exceeding 2000 to provide soft segments in said film, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the reaction mixture, to produce a breathable non-porous polyurethane film block copolymer, and coating a fabric with said block copolymer to produce said fabric coated with said breathable non-porous polyurethane film.
Claim 27
Dependent Claim
106 words
A process for preparing a fabric coated with a breathable non-porous polyurethane film comprising reacting a reaction mixture consisting of a diisocyanate, a low molecular weight difunctional compound to provide hard segments in said film, and a polyethylene glycol having an average molecular weight not exceeding 2000 to provide soft segments in said film, said polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the reaction mixture, to produce a breathable non-porous polyurethane film block copolymer, and coating a fabric with said block copolymer to produce said fabric coated with said breathable non-porous polyurethane film.
Claim 28
Dependent Claim
14 words
A process as claimed in claim 23, further comprising cross linking said polyurethane polymer.
References Cited (Backward Citations)
US3607822A
Cited
US4202880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |