Patent US5055516A successfully refreshed from Google Patents.
US5055516A
Expired / Lapsed
US
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Preparation of emulsifier-free aqueous polyurethane dispersions
Assignee: BASF SE
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Filing: 1990-01-08
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Granted: 1991-10-08
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Expires: 2010-01-08
Abstract
Abstract Emulsifier-free aqueous polyurethane dispersions are prepared by reacting (a) dihydroxy compounds, (b) diisocyanates and (c) chain extenders to give a prepolymer having terminal isocyanate groups, then reacting the prepolymer with (d) salts of aliphatic aminocarboxylic or -sulfonic acids or amino-containing or hydroxyl-containing tertiary ammonium salts, dispersing the resulting polyurethane in water and, if required, removing the organic solvent by distillation. In the process, an organic condensation resin which is dissolved in a solvent is admixed before the polyurethane obtained is dispersed in water.
Inventors
- 👤 Herbert Fisch
- 👤 Lothar Maempel
- 👤 Otto Volkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08L; C08L63/00; C08G2170/00; C08G2170/80; C08L2666/00; C08L2666/02; C08L2666/14; C08L2666/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
A process for the preparation of an emulsifier-free aqueous polyurethane dispersion by reacting (a) dihydroxy compounds having a molecular weight of from 500 to 5,000, (b) diisocyanates and (c) chain extenders having two or more hydrogen atoms reactive to isocyanate groups and having a molecular weight of less than 300, in the melt or in the presence of a water-miscible inert organic solvent (S) boiling below 100° C., to give a prepolymer having terminal isocyanate groups, then reacting the prepolymer, which may be dissolved in a water-miscible inert organic solvent (S), with (d) salts of aliphatic aminocarboxylic or -sulfonic acids or amino-containing or hydroxyl-containing tertiary ammonium salts, which salts may be dissolved in water, dispersing the resulting polyurethane in water, wherein from 5 to 60 parts by weight, based on 100 parts by weight of the polyurethane, of a phenol/formaldehyde or epoxy organic condensation resin which is dissolved in a solvent boiling below 100° C. is admixed before the polyurethane obtained is dispersed in water.
Claim 2
Dependent Claim
165 words
A process for the preparation of an emulsifier-free aqueous polyurethane dispersion by reacting (a) dihydroxy compounds having a molecular weight of from 500 to 5,000, (b) diisocyanates and (c) chain extenders having two or more hydrogen atoms reactive to isocyanate groups and having a molecular weight of less than 300, in the melt or in the presence of a water-miscible inert organic solvent (S) boiling below 100° C., to give a prepolymer having terminal isocyanate groups, then reacting the prepolymer, which may be dissolved in a water-miscible inert organic solvent (S), with (d) salts of aliphatic aminocarboxylic or -sulfonic acids or amino-containing or hydroxyl-containing tertiary ammonium salts, which salts may be dissolved in water, dispersing the resulting polyurethane in water, wherein from 5 to 60 parts by weight, based on 100 parts by weight of the polyurethane, of a phenol/formaldehyde or epoxy organic condensation resin which is dissolved in a solvent boiling below 100° C. is admixed before the polyurethane obtained is dispersed in water.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, wherein the organic condensation resin used in a phenol/formaldehyde condensate.
Claim 4
Dependent Claim
25 words
A method of bonding materials, comprising applying to said materials a product obtained as claimed in claim 1, as an adhesive, and bonding said materials.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1, wherein the organic condensation resin is an epoxy condensate.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1, wherein after dispersing the polyurethane in water said organic solvent is removed by distillation.
Claim 7
Dependent Claim
23 words
A method as claimed in claim 3, wherein the organic condensation resin used in the preparation of said adhesive is a phenol/formaldehyde condensate.
Claim 8
Dependent Claim
23 words
A method as claimed in claim 3, wherein the organic condensation resin used in the preparation of said adhesive is an epoxy condensate.
Claim 9
Dependent Claim
15 words
An adhesive comprising an emulsifier-free aqueous polyurethane dispersion obtained by the process of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |