Patent US4181770A successfully refreshed from Google Patents.
US4181770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate-terminated branched polyethylene glycol and polyester polyurethane foams
Assignee: Carl Freudenberg KG
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Filing: 1975-11-25
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Granted: 1980-01-01
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Expires: 1995-11-25
Abstract
Abstract A hydrophilic foam is produced by mixing an isocyanate terminated branched polyethylene polyol with a polyester prepolymer and water. The foam may be used to impregnate fabrics, e.g., non-wovens, to produce reinforced sheets of foam of high absorbency and markedly improved abrasion resistance. Preferred polyesters are condensation products of adipic acid plus one or more alkanediols or a polylactone. Other prepolymers may also be included in the mix undergoing foaming, along with conventional additives.
Inventors
- 👤 Gunter Schuhmacher
- 👤 Walter Fottinger
- 👤 Adolf Graber
- 👤 Erich Fahrbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/08; C08G18/10; C08G18/12; C08G2110/00; C08G2110/0083; C08G2150/00; C08G2150/60; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/273; Y10T442/60; Y10T442/647; Y10T442/652
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A hydrophilic sheet of polyurethane-based foam comprising the product of reacting in the presence of water (A) a major amount of an isocyanate terminated branched polyethylene polyol prepolymer, (B) a minor amount of an isocyanate terminated polyester-diol prepolymer, and (C) a minor amount of a liquid 4,4'-diphenylmethane-diisocyanate/polycarbodiimide condensation product with a 30% NCO content.
Claim 2
Dependent Claim
54 words
A hydrophilic sheet of polyurethane-based foam comprising the product of reacting in the presence of water (A) a major amount of an isocyanate terminated branched polyethylene polyol prepolymer, (B) a minor amount of an isocyanate terminated polyester-diol prepolymer, and (C) a minor amount of a liquid 4,4'-diphenylmethane-diisocyanate/polycarbodiimide condensation product with a 30% NCO content.
Claim 3
Dependent Claim
10 words
A sheet according to claim 1, having a textile reinforcement.
Claim 4
Dependent Claim
13 words
A sheet according to claim 2, wherein said textile is a non-woven fabric.
Claim 5
Dependent Claim
56 words
A process for the production of a hydrophilic foam by mixing and reacting in the presence of water (A) a major amount of an isocyanate terminated branched polyethylene polyol prepolymer, (B) a minor amount of an isocyanate terminated polyester-diol prepolymer, and (C) a minor amount of a liquid 4,4'-diphenylmethane-diisocyanate/polycarbodiimide condensation product with a 30% NCO content.
Claim 6
Dependent Claim
56 words
A process for the production of a hydrophilic foam by mixing and reacting in the presence of water (A) a major amount of an isocyanate terminated branched polyethylene polyol prepolymer, (B) a minor amount of an isocyanate terminated polyester-diol prepolymer, and (C) a minor amount of a liquid 4,4'-diphenylmethane-diisocyanate/polycarbodiimide condensation product with a 30% NCO content.
Claim 7
Dependent Claim
24 words
The process according to claim 4, comprising the additional step of pouring the mix over a textile fabric thereby to form a fabric-reinforced foam.
Claim 8
Dependent Claim
13 words
The process according to claim 5, wherein said fabric is a non-woven fabric.
Claim 9
Dependent Claim
80 words
The process according to claim 4, wherein said isocyanate-terminated branched polyethylene polyol and said isocyanate-terminated polyester-diol prepolymer are the respective reaction products of a branched polyethylene polyol and of a polyester diol with at least one diisocyanate selected from the group consisting of toluylene-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,5-naphthalene-diisocyanate, 1,6-hexamethylene-diisocyanate, isophorone-diisocyanate, triphenylmethane-triisocyanate, and condensation products thereof, and said polyester-prepolymer is at least one member selected from the group consisting of a polylactone and a condensation product of dicarboxylic acid and a glycol.
Claim 10
Dependent Claim
35 words
The process according to claim 7, wherein said polyester is the condensation product of adipic acid and at least one glycol selected from the group consisting of ethylene glycol, propanediol, butanediol, pentanediol, neopentylglycol and hexanediol.
Claim 11
Dependent Claim
24 words
The process according to claim 8, comprising the additional step of pouring the mix over a non-woven fabric thereby to form a fabric-reinforced foam.
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |