US4746684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane dispersion and emulsion, sheet-like porous material and production process thereof
Assignee: Dainichiseika Color and Chemicals Mfg Co Ltd
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Filing: 1987-05-13
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Granted: 1988-05-24
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Expires: 2007-05-13
Abstract
Abstract A polyurethane dispersion contains (A) an organic solvent, (B) a polyurethane resin having a molecular weight of 20,000-500,000, and (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate. The dispersion can be converted into an emulsion by emulsifying water therein. A sheet-like porous material is also obtained by impregnating and/or coating a base material with the emulsion, causing the thus-coated emulsion to gel and then drying the resultant base material. The dispersion has excellent stability. The emulsion can be gelatinized at a relatively high temperature in a rather short period time, thereby permitting efficient production of the sheet-like porous material. The sheet-like material has a very fine porous structure, is excellent in various properties and has superb water vapor transmission characteristics. It is useful as a raw material for various synthetic hides, namely, for clothing, shoes, waterproof cloths, tents, wall paper, flooring, filter media, filters for air conditioners, etc.
Inventors
- 👤 Katsumi Kuriyama
- 👤 Misao Ichihara
- 👤 Iwao Misaizu
- 👤 Masashi Kashimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:44
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J3/00; C08J3/02; C08J3/09; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A polyurethane dispersion comprising; (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000; and (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate.
Claim 2
Dependent Claim
48 words
A polyurethane dispersion comprising; (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000; and (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate.
Claim 3
Dependent Claim
34 words
The polyurethane dispersion as claimed in claim 1, wherein the fine particles (C) have been formed in a solution of a polyurethane resin having a molecular weight of 20,000-250,000 in the organic solvent (A).
Claim 4
Dependent Claim
55 words
A polyurethane emulsion comprising: (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000; (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate; and (D) water emulsified in the organic solvent.
Claim 5
Dependent Claim
55 words
A polyurethane emulsion comprising: (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000; (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate; and (D) water emulsified in the organic solvent.
Claim 6
Dependent Claim
64 words
A sheet-like porous material with a porous layer of a polyurethane resin provided on a base material, wherein the porous layer is composed of (A) a polyurethane resin having a molecular weight of 20,000-500,000 and (B) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate.
Claim 7
Dependent Claim
64 words
A sheet-like porous material with a porous layer of a polyurethane resin provided on a base material, wherein the porous layer is composed of (A) a polyurethane resin having a molecular weight of 20,000-500,000 and (B) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate.
Claim 8
Dependent Claim
104 words
A process for producing a sheet-like porous material by impregnating and/or coating a base material with an oil-in-water polyurethane emulsion, causing the thus-coated emulsion to gel and then drying the resultant base material, wherein the polyurethane emulsion comprises: (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000 and dissolved in the organic solvent (A); (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate, and dispersed in the organic solvent (A); and (D) water emulsified in the organic solvent (A).
Claim 9
Dependent Claim
104 words
A process for producing a sheet-like porous material by impregnating and/or coating a base material with an oil-in-water polyurethane emulsion, causing the thus-coated emulsion to gel and then drying the resultant base material, wherein the polyurethane emulsion comprises: (A) an organic solvent; (B) a polyurethane resin having a molecular weight of 20,000-500,000 and dissolved in the organic solvent (A); (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate, and dispersed in the organic solvent (A); and (D) water emulsified in the organic solvent (A).
Claim 10
Dependent Claim
34 words
The sheet-like porous material as claimed in claim 5, wherein the particles (C) have been formed in a solution of a polyurethane resin having a molecular weight of 20,000-250,000 in the organic solvent (A).
References Cited (Backward Citations)
US4086193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |