Aqueous adhesive dispersion containing polyurethanes and ethoxylated fatty alcohols

Patent metadata

Field	Value
Publication number	US-2017355887-A1
Application number	US-201515529177-A
Country	US
Kind code	A1
Filing date	Dec 2, 2015
Priority date	Dec 5, 2014
Publication date	Dec 14, 2017
Grant date	—

Abstract

Described are aqueous adhesive dispersions comprising dispersed polyurethanes and also ethoxylated fatty alcohols as emulsifiers. The polyurethanes are constructed from certain organic diisocyanates, dihydroxy compounds selected from certain polyester diols and polyether diols, and compounds having groups reactive toward isocyanate groups and having at least one ionic group. The adhesive dispersions can be used as laminating adhesives, for example for composite film lamination or for the lamination of rigid moldings with flexible decorative foils.

First claim

1 . An aqueous adhesive dispersion, comprising:
a) at least one dispersed polyurethane constructed from
a1) at least one organic diisocyanate, selected from diisocyanatcs of the formula: X(NCO) 2 , where X is a noncyclic aliphatic hydrocarbon radical having 4 to 15 carbon atoms, a cycloaliphatic hydrocarbon radical having 6 to 15 carbon atoms, an aromatic hydrocarbon radical having 6 to 15 carbon atoms, or an araliphatic hydrocarbon radical having 7 to 15 carbon atoms,
a2) at least one dihydroxy compound selected from the group consisting of a polyester diol and a polyether diol, the polyester diol being formed from at least one aliphatic dicarboxylic acid and at least one alkanediol, and the polyether diol being selected from the group consisting of a polypropylene oxide and a polytetrahydrofuran,
a3) at least one compound having at least one group reactive toward isocyanate groups, and additionally carrying at least one ionic group or one group which can be converted into an ionic group, and
a4) optionally at least one further compound different from a1) to a3); and
b) at least one nonionic emulsifier comprising an ethoxylated fatty alcohol.

2 . The aqueous adhesive dispersion according to claim 1 , wherein the dihydroxy compound a2) has a number-average molar weight of 500 to 5000 g/mol and comprises no ionic group or group which can be converted into an ionic group.

3 . The aqueous dispersion according to claim 1 , comprising:
30 to 55 weight % of the polyurethane a), based on the aqueous adhesive dispersion; and, 0.5 to 2 weight % of the nonionic emulsifier b), based on a total amount of solids.

4 . The aqueous dispersion according to claim 1 , wherein the diisocyanate a1) is selected from the group consisting of hexamethylene diisocyanate, 1-isocyanato-3,5,5 -trimethyl-5-isocyanatomethylcyclohexane, 2,6-diisocyanatotoluene, 2,4-diisocyanatotoluene, tetramethylxylylene diisocyanate, and a mixture thereof.

5 . The aqueous dispersion according to claim 1 , wherein the dihydroxy compound a2) is selected from the group consisting of an adipic acid-butanediol polyester and an adipic acid-hexanediol polyester.

6 . The aqueous dispersion according to claim 1 , wherein the compound a3) is selected from the group consisting of a dihydroxycarboxylic acid, diaminocarboxylic acid and a diaminosulfonic acid.

7 . The aqueous dispersion according to claim 1 , wherein the ethoxylated fatty alcohol b) is a C16 to C18 fatty alcohol with a degree of ethoxylation of 8 to 50.

8 . The aqueous dispersion according to claim 1 , wherein:
the polyurethane a) is constructed from
a1) at least one organic diisocyanate selected from the group consisting of hexamethylene diisocyanate, 1-isocyanato-3,5,5-trimethyl-5-isocyanatomethylcyclohexane, 2,6-diisocyanatotoluene, 2,4-diisocyanatotoluene, tetramethylxylylene diisocyanate, and a mixture thereof,
a2) at least one dihydroxy compound selected from the group consisting of adipic acid-butanediol polyester and adipic acid-hexanediol polyester,
a3) at least one compound having at least one group reactive toward isocyanate groups, and additionally carrying at least one ionic group or one group which can be converted into an ionic group, selected from the group consisting of a diaminocarboxylic acid and a diaminosulfonic acid,
a4) optionally the at least one further compound different from a1) to a3); and
the aqueous adhesive dispersion comprises: b) from 0.5 to 2 weight %, based on the total amount of solids, of at least one nonionic emulsifier which is a C16 to C18 fatty alcohol with a degree of ethoxylation of 8 to 50.

9 . A laminating adhesive, comprising aqueous adhesive dispersion of claim 1 .

Assignees

• Basf Se

Inventors

• Schumacher Karl-Heinz
• Sanders Gemma
• Simancas Kimberly
• Hartz Oliver

Classifications

• B32B2307/308

  Heat stability · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title

• B32B2605/003

  Interior finishings · CPC title

• C08G18/7621

  being toluene diisocyanate including isomer mixtures · CPC title

• B32B27/08

  of synthetic resin · CPC title