US3663266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture responsive synthetic microporous sheet material
Assignee: EIDP Inc
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Filing: 1970-05-21
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Granted: 1972-05-16
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Expires: 1990-05-21
Abstract
Abstract A coriaceous vapor permeable microporous sheet material that absorbs water and expands under moist conditions is the subject of this invention. The novel material is particularly useful for making shoes and boots and provides better comfort and appearance than natural leather. The novel coriaceous material has a coating of a microporous polymer which is in firm adherence to a substrate of a polymer impregnated non-woven synthetic fibrous web. The novel sheet material under high humidity conditions as occur when a shoe or boot is worn has a particular moisture absorption, area expansion, and a decrease in tensile stress and also has a high permeability to water vapors. These particular characteristics provide a high degree of comfort to the wearer of shoes or boots made from the novel sheet material of this invention.
Inventors
- 👤 John I Dye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 15:55
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D06N; D06N3/00; D06N3/0002; D06N3/0015; D06N3/12; D06N3/14; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/904; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2148; Y10T442/30; Y10T442/3707; Y10T442/3724; Y10T442/3764; Y10T442/3772; Y10T442/378; Y10T442/3813
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
186 words
said web being impregnated with a polymeric binder that has a wet tensile strength of at least 500 pounds per square inch and has a moisture absorption of 5- 25 percent by weight when exposed to a change in relative humidity of 50 to 90 percent at 25* C.; in which the polymeric binder is a chain-extended polyurethane which is the reaction product of an isocyanate terminated prepolymer of a polyalkyleneether glycol and an organic diisocyanate chain-extended with a compound having at least one reactive hydrogen atom attached to each end of the compound; wherein the substrate has a binder to fiber ratio of about 0.2/1 to 2/1, and wherein the coriaceous sheet material has an area expansion of 2- 10 percent, a moisture absorption of 0.5 - 20 percent by weight and a decrease in tensile stress at 5 percent elongation of 20- 60 percent when exposed to a change in relative humidity of 50- 90 percent at 25* C. and has a water vapor permeability of at least 1,000 and up to 12,000 grams of water per 100 square meters of material per hour.
Claim 2
Dependent Claim
26 words
The sheet material of claim 1 in Which the fibrous web is of 10- 30 percent rayon fibers and 90- 70 percent of said polyamide fibers.
Claim 3
Dependent Claim
35 words
The sheet material of claim 1 in which the polyurethane is the reaction products of an isocyanate terminated prepolymer of a polyethyleneether glycol molecular weight about 500- 1,500, methylene-bis-4-phenyl isocyanate and is chain-extended with hydrazine.
Claim 4
Dependent Claim
23 words
The sheet material of claim 1 in which the polymeric binder is a blend of a chain-extended polyurethane and a moisture absorbing material.
Claim 5
Dependent Claim
76 words
The sheet material of claim 4 in which the chain-extended polyurethane is an isocyanate terminated prepolymer of an aromatic diisocyanate and a polymeric material having a molecular weight of 500-1,500 and having active hydrogen atoms selected from the group consisting of polyalkyleneether glycol and a hydroxyl terminated polyester and is chain extended with a compound having an active hydrogen attached to each end of the compound and in which the moisture absorbing material is polyvinyl pyrrolidone.
Claim 6
Dependent Claim
37 words
The sheet material of claim 5 in which the chain-extended polyurethane is an isocyanate terminated prepolymer of a toluene diisocyanate, methylene-bis-4-phenyl isocyanate polytetramethyleneether glycol molecular weight 500-2,000 which is chain-extended with a blend of hydrazine and N,N-bis-(amino-propyl)methylamine.
Claim 7
Dependent Claim
50 words
The sheet material of claim 1 which has a fabric of polyamide fibers between the microporous polymeric coating and the porous fibrous substrate, the polymeric coating being sufficiently thick to penetrate the fabric and firmly bond the fabric to the substrate while the exposed surface of said coating is smooth.
Claim 8
Dependent Claim
65 words
The sheet material of claim 1 in which the fibrous web is hydraulically needled and has a substantially uniform dense structure of interentangled fibers characterized by random fiber segments that are oriented transversely to the plane of the substrate and have a fiber entanglement completeness of at least 0.5, and an entanglement frequency of at least 25 per inch when measured in a bond-free condition.
Claim 9
Dependent Claim
68 words
The sheet material of claim 1 in which the polymeric component of the microporous topcoat is a blend of a chain-extended polyurethane and polyvinyl chloride and the non-woven web is of polyhexamethylene adipamide fibers and the web is impregnated with a chain-extended polyurethane of a polyalkyleneether glycol and aromatic diisocyanate which is chain-extended with a compound having at least one active hydrogen attached to each amino nitrogen atom.
Claim 10
Dependent Claim
118 words
The sheet material of claim 1 in which the polymeric component of the microporous topcoat is a blend of a chain-extended polyurethane and polyvinyl chloride and the non-woven web is hydraulically needled and has a substantially uniform dense structure of interentangled fibers characterized by random fiber segments that are oriented transversely to the plane of the substrate and have a fiber entanglement completeness of at least 0.5, and an entanglement frequency of at least 25 per inch when measured in a bond-free condition and the web is impregnated with a chain-extended polyurethane of a polyalkyleneether glycol and aromatic diisocyanate which is chain extended with a compound having at least one active hydrogen attached to each amino nitrogen atom.
Claim 11
Dependent Claim
66 words
The sheet material of claim 1 in which the polymeric component of the microporous topcoat is a blend of a chain-extended polyurethane and polyvinyl chloride and the non-woven web is a blend of polyamide and rayon fibers and the web is impregnated with a polymer blend of a chain-extended polyurethane of an aromatic diisocyanate and a polyalkyleneether glycol chain-extended with hydrazine and blended with polyvinyl pyrrolidone.
Claim 12
Dependent Claim
41 words
The sheet material of claim 1 in which the substrate is impregnated with an acrylic binder and the microporous topcoat is of a chain-extended polyurethane of an aromatic diisocyanate and a polyalkyleneether glycol chaIn-extended with a glycol having 1-5 carbon atoms.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |