Cold contact adhesives

Patent metadata

Field	Value
Publication number	US-9453147-B2
Application number	US-201214350999-A
Country	US
Kind code	B2
Filing date	Oct 11, 2012
Priority date	Oct 14, 2011
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

An aqueous dispersion comprising at least one polyurethane polymer with a melting temperature in the range of 30° C. to 50° C. and (cold contact) adhesives comprising such a polyurethane dispersion, a method for creating an adhesive bonding and the use of such (cold contact) adhesives for creating an adhesive bonding.

First claim

The invention claimed is:

1. An aqueous dispersion comprising at least one polyurethane polymer with a melting temperature in the range of 30° C. to 50° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min, the polyurethane polymer being obtained from a reaction mixture comprising:
AI) at least one polyester polyol with a number average molecular weight in the range of 400 g/mol to 5000 g/mol and a melting temperature in the range of 40° C. to 80° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min;
AII) at least one polyester polyol with a number average molecular weight in the range of 400 g/mol to 5000 g/mol and a melting temperature in the range of 5° C. to 35° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min;
B) optionally, at least one difunctional polyol component;
C) at least one aliphatic diisocyanate; and
D) at least one aminic chain extender comprising at least one ionic or potentially ionic group;

wherein
the molar ratio AI):AII) is in the range of 7:3 to 3:7.

2. The dispersion according to claim 1 , wherein the polyurethane polymer has a glass transition temperature in the range of −60° C. to −10° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min.

3. The dispersion according to claim 1 , wherein the polyester polyol AI) has a melting temperature in the range of 40° C. to 60° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min.

4. The dispersion according to claim 1 , wherein the polyester polyol AII) has a melting temperature in the range of 15° C. to 30° C. as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min.

5. The dispersion according to claim 1 , wherein the molar ratio AI):AII) is in the range of 6:4 to 4:6.

6. The dispersion according to claim 1 , wherein the polyester polyol AI) has an enthalpy of fusion in the range of 65 J/g to 90 J/g as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min.

7. The dispersion according to claim 1 , wherein the polyester polyol AII) has an enthalpy of fusion in the range of 30 J/g to 70 J/g as determined by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K/min.

8. The dispersion according to claim 1 , wherein the polyester polyols AI) and AII) are aliphatic.

9. The dispersion according to claim 1 , wherein the polyester polyol AI) is obtained from a reaction mixture comprising adipic acid and 1,4-butanediol or 1,6-hexanediol.

10. The dispersion according to claim 1 , wherein the polyester polyol AII) is obtained from a reaction mixture comprising adipic acid, 1,6-hexanediol and neopentyl glycol or from a reaction mixture comprising adipic acid, 1,4-butanediol and neopentyl glycol.

11. The dispersion according to claim 1 , wherein the aliphatic diisocyanate C) is selected from the group consisting of hexamethylene 1,6-diisocyanate, 1,3-bis(isocyanato-methyl)cyclohexane, 1,4-bis(isocyanato-methyl)cyclohexane, isophorone diisocyanate, 4,4′-diasocyanato-cyclohexyl)methane, 2,4′-di(isocyanato-cyclohexyl)methane, and mixtures thereof.

12. The dispersion according to claim 1 , wherein the aminic chain extender D) comprises a mixture of the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid and diethanolamine or comprises a mixture of the sodium salt of N-(2-aminoethyl)-2-aminoethanesulfonic acid, diethanolamine and N-(2-hydroxyethyl)-ethylenediamine.

13. An adhesive comprising at least the dispersion according to claim 1 .

14. The adhesive according to claim 13 , wherein the adhesive is a cold contact adhesive.

15. A method comprising utilizing the dispersion according to claim 1 for bonding of rubber materials selected from the group consisting of natural and synthetic rubbers, polyurethanes, polyvinyl acetate, and polyvinyl chloride.

16. A method comprising utilizing the dispersion according to claim 1 for bonding porous or water vapor-permeable substrates by wet-in-wet processes.

Assignees

• Bayer Ip Gmbh
• Covestro Deutschland Ag

Inventors

• Kraus Harald
• Arndt Wolfgang
• Wintermantel Matthias

Classifications

• C08G18/0823 Primary

  containing carboxylate salt groups or groups forming them · CPC title

• C09J9/00 Primary

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title

• C08G18/4202

  Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence) · CPC title

• C08G18/10 Primary

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G18/0828

  containing sulfonate groups or groups forming them · CPC title