US4510186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a porous sheet material
Assignee: Dainichiseika Color and Chemicals Mfg Co Ltd
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Filing: 1983-07-26
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Granted: 1985-04-09
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Expires: 2003-07-26
Abstract
Abstract A process for preparing a porous sheet material, which comprises impregnating and/or coating on a substrate a water-in-oil type polyurethane emulsion (d) comprising a hydrophobic polyurethane (a), a hydrophilic polyurethane (b), and organic solvent (c) and water, and drying it, characterized in that said hydrophobic polyurethane (a) is a hydrophobic polyurethane dispersion (e) obtained by reacting a hydrophobic polyol, an organic diisocyanate and a chain extender is an organic solvent (c) which has a limited compatibility with water and in which the polyurethane thereby formed is substantially insoluble; said hydrophilic polyurethane (b) is a polyurethane containing about 20 to about 40% by weight, based on the total polymer, of polyoxyethylene groups; and the weight ratio of (a):(b) is about 90-99: about 10-1.
Inventors
- 👤 Katsumi Kuriyama
- 👤 Isao Kondo
- 👤 Iwao Misaizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08L; C08L75/00; C08L75/04; C09; C09D; C09D175/00; C09D175/04; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/141; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A process for preparing a porous sheet material, which comprises: (1) impregnating and/or coating on a substrate a water-in-oil type polyurethane emulsion (d) comprising a hydrophobic polyurethane (a), a hydrophilic polyurethane (b), an organic solvent (c) and water; said process characterized in that said hydrophobic polyurethane (a) is a hydrophobic polyurethane dispersion (e) obtained by reacting a hydrophobic polyol, an organic diisocyanate and a chain extender in an organic solvent (c) which has a limited compatibility with water and in which the polyurethane thereby formed is substantially insoluble; said hydrophilic polyurethane (b) is a polyurethane containing about 20 to about 40% by weight, based on the total polymer, of polyoxyethylene groups; and the weight ratio of (a):(b) is about 90-99:about 10-1; and (2) drying at a temperature of 60° to 100° C. for about 1 to 3 minutes and 100° to 150° C. for about 1 to 3 minutes.
Claim 2
Dependent Claim
149 words
A process for preparing a porous sheet material, which comprises: (1) impregnating and/or coating on a substrate a water-in-oil type polyurethane emulsion (d) comprising a hydrophobic polyurethane (a), a hydrophilic polyurethane (b), an organic solvent (c) and water; said process characterized in that said hydrophobic polyurethane (a) is a hydrophobic polyurethane dispersion (e) obtained by reacting a hydrophobic polyol, an organic diisocyanate and a chain extender in an organic solvent (c) which has a limited compatibility with water and in which the polyurethane thereby formed is substantially insoluble; said hydrophilic polyurethane (b) is a polyurethane containing about 20 to about 40% by weight, based on the total polymer, of polyoxyethylene groups; and the weight ratio of (a):(b) is about 90-99:about 10-1; and (2) drying at a temperature of 60° to 100° C. for about 1 to 3 minutes and 100° to 150° C. for about 1 to 3 minutes.
Claim 3
Dependent Claim
60 words
The process according to claim 1, wherein the hydrophobic polyol is selected from the group consisting of polyethylene adipate, polyethylenepropylene adipate, polyethylenebutylene adipate, polydiethylene adipate, polybutylene adipate, polyethylene succinate, polybutylene succinate, polyethylene sebacate, polybutylene sebacate, polytetramethylene ether glycol, poly-ε-caprolactonediol, polyhexamethylene adipate, carbonate polyol, and polypropylene glycol, which have terminal hydroxyl groups and a molecular weight of from 300 to 4000.
Claim 4
Dependent Claim
38 words
The process according to claim 1, wherein the organic diisocyanate is selected from the group consisting of 4,4-diphenyl-methane-diisocyanate (MDI), hydrogenated MDI, isophorone diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,5-naphthaline diisocyanate, m-phenylene diisocyanate and p-phenylene diisocyanate.
Claim 5
Dependent Claim
36 words
The process according to claim 1, wherein the chain extender is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, 1,4-butanediol, 1.6-hexanediol, ethylenediamine, 1,2-propylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, decamethylenediamine, isophoronediamine, m-xylylenediamine, hydrazin and water.
Claim 6
Dependent Claim
29 words
The process according to claim 1, wherein the hydrophobic polyurethane particles in the hydrophobic polyurethane dispersion (e) have a particle size of from about 0.1 to about 5 μm.
Claim 7
Dependent Claim
50 words
The process according to claim 1, wherein the organic solvent (c) is selected from the group consisting of methylethyl ketone, methyl-n-propyl ketone, methylisobutyl ketone, diethyl ketone, methylformate, ethyleformate, propylformate, methylacetate, ethyleacetate, butylacetate, acetone, cyclohexane, tetrahydrofuran, dioxane, methanol, ethanol, isopropylalchol, butanol, toluene, xylene, dimethylformamide, dimethylsulfoxide, perchloroethylene, trichloroethylene, methylcellosolve, butylcellosolve and cellosolveacetate.
Claim 8
Dependent Claim
23 words
The process according to claim 1, wherein the hydrophobic polyurethane dispersion (e) has a solid content of from 5 to 60% by weight.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |