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US4314922A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of aqueous polyurethane dispersions

Assignee: BASF SE
•
Filing: 1981-02-05
•
Granted: 1982-02-09
•
Expires: 2001-02-05
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Abstract

Abstract A process for preparing aqueous polyurethane dispersions has been discovered which comprises (a) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of a solvent with (i) an acrylic ester diol having a molecular weight of between 146 and 3,000; (ii) an organic polyhydroxyl compound other than (i) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (iii) a chain extender having a molecular weight between 62 and 400 selected from the group consisting of diols, triols, diamines, aminoalcohols, and mixtures thereof; (b) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (c) adding water; and (d) removing the solvent. The dispersions can be used in a variety of applications. For instance, they can be used to prepare films, coating, and binders.

Inventors

  • 👤 August Lehner
  • 👤 Alexander Kud
  • 👤 Heinrich Hartmann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 15:00
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/07; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6705; C08G18/675; C08G18/83; C08G18/834; C08G18/835; C08J2375/00; C08J2375/04

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 131 words
A process for preparing an aqueous polyurethane dispersion which comprises (a) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of an organic solvent with (i) an acrylic ester diol having a molecular weight of between 146 and 3,000; (ii) an organic polyhydroxyl compound other than (i) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (iii) a chain extender having a molecular weight between 62 and 400 selected from the group consisting of diols, triols, diamines, aminoalcohols, and mixtures thereof; (b) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (c) adding water; and (d) removing the organic solvent.
Claim 2
Dependent Claim 131 words
A process for preparing an aqueous polyurethane dispersion which comprises (a) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of an organic solvent with (i) an acrylic ester diol having a molecular weight of between 146 and 3,000; (ii) an organic polyhydroxyl compound other than (i) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and (iii) a chain extender having a molecular weight between 62 and 400 selected from the group consisting of diols, triols, diamines, aminoalcohols, and mixtures thereof; (b) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; (c) adding water; and (d) removing the organic solvent.
Claim 3
Dependent Claim 24 words
The process of claim 1 wherein the ratio of isocyanate groups to reactive hydrogen atoms in forming the polyurethane solution is 0.7:1 to 1.2:1.
Claim 4
Dependent Claim 36 words
The process of claim 1 wherein the polyurethane solution is reacted with such quantities of the mercaptocarboxylic acid salts that the content of carboxylic groups of the addition product is 0.5 to 10 percent by weight.
Claim 5
Dependent Claim 22 words
The process of claim 1 wherein the polyurethane solution is reacted with such quantities of mercaptocarboxylic acid salts that no unsaturation remains.
Claim 6
Dependent Claim 39 words
The process of claim 1 wherein the amount of mercaptocarboxylic acid salt reacted with the polyurethane solution is such that 10 to 95 percent of the carbon to carbon double bonds of the acrylic ester diols have been reacted.
Claim 7
Dependent Claim 12 words
The process of claim 1 wherein the mercaptocarboxylic acid is mercaptoacetic acid.
Claim 8
Dependent Claim 10 words
An aqueous polyurethane dispersion prepared in accordance with claim 1.

References Cited (Backward Citations)

US3437624A Cited
US3878077A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-02-08 1985-08-10 1986-02-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-02-08 1989-08-10 1990-02-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-02-08 1993-08-10 1994-02-09 $7700.00 Window Closed / Lapsed

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