Article comprising expanded TPU and a water based coating

Patent metadata

Field	Value
Publication number	US-10927274-B2
Application number	US-201816622989-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jul 4, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The present invention relates to an article comprising expanded thermoplastic polyurethane as a substrate and a specific polyurethane urea coating on said substrate, as well as footwear, a process for producing the article and a use of a polyurethane urea dispersion/solution. It has been found that a polyurethane urea coating comprising polycarbonate structural units strongly binds to expanded TPU substrates and maintains the intrinsic properties of the expanded TPU.

First claim

The invention claimed is:

1. An article comprising expanded thermoplastic polyurethane as a substrate and a coating on at least a part of said substrate, wherein the coating is obtained by curing a water-based polyurethane urea solution and/or dispersion, wherein the polyurethane urea comprises polycarbonate structural units and is obtained by a reaction of educts, comprising:
a) at least one macrodiol having a number average molecular weight of from 600 g/mol to 4000 g/mol, wherein the at least one macrodiol comprises a polycarbonatediol,
b) from 0.5 mol to 2 mol of an aliphatic diamine, a cycloaliphatic diamine, or hydrazine per mol of the at least one macrodiol, and
c) from 1.5 mol to 3 mol of an aliphatic, cycloaliphatic, or aromatic diisocyanate per mol of the at least one macrodiol.

2. The article according to claim 1 , wherein the expanded thermoplastic polyurethane comprises at least one polyether.

3. The article according to claim 1 , wherein the expanded thermoplastic polyurethane additionally comprises at least one lubricant.

4. The article according to claim 3 , wherein the at least one lubricant comprises talc, a metal compound, silica, a salt of a C10 to C22 carboxylic acid, an ester of a C10 to C22 carboxylic acid, a silicone oil, polytetrafluoroethylene, or a combination of at least two thereof.

5. The article according to claim 1 , wherein the polyurethane urea comprises alkoxysilane structural units.

6. The article according to claim 1 , wherein the solid content of the water-based polyurethane urea solution and/or dispersion is in a range of from 35 to 60 wt.-%, based on the total weight of the polyurethane urea solution and/or dispersion.

7. The article according to claim 1 , wherein the polyurethane urea solution and/or dispersion additionally comprises at least one colorant.

8. The article according to claim 1 , wherein the polyurethane urea solution and/or dispersion additionally comprises at least one polyisocyanate.

9. The article according to claim 1 , wherein the article is comprises a shoe sole, a seat, a car seat, a child's seat, a tube, a bicycle tube, a roll, a cabin roll, a bumper, an auto bumper, a cushion, a mattress, or a combination of at least two thereof.

10. Footwear comprising the article according to claim 1 .

11. A process for the production of the article according to claim 1 comprising the steps of:
1) providing a substrate comprising expanded thermoplastic polyurethane,
2) applying a water-based polyurethane urea solution and/or dispersion on at least a part of said substrate of step 1), wherein the polyurethane urea comprises polycarbonate structural units and is obtained by a reaction of educts, comprising:
a) at least one macrodiol having a number average molecular weight of from 600 g/mol to 4000 g/mol, wherein the at least one macrodiol comprises a polycarbonatediol,
b) from 0.5 mol to 2 mol of an aliphatic diamine, a cycloaliphatic diamine, or hydrazine per mol of the at least one macrodiol, and
c) from 1.5 mol to 3 mol of an aliphatic, cycloaliphatic, or aromatic diisocyanate per mol of the at least one macrodiol,

3) curing said water-based polyurethane urea solution and/or dispersion of step 2) in order to obtain a coating, and
4) optionally repeating steps 2) and 3) at least one time, wherein, when repeating step 2) the water-based polyurethane urea solution and/or dispersion is applied to the cured coating obtained in step 3) or in repeated step 3).

12. The process of claim 11 , wherein in step 2) the water-based polyurethane urea solution and/or dispersion is applied to the substrate by brushing, spraying, rolling, roll coating, slot coating, dipping, printing, or a combination thereof.

13. The process according to claim 11 , wherein the water-based polyurethane urea solution and/or dispersion has a viscosity of 10 to 30 seconds according to DIN EN ISO 2431.

14. A decorative coating of a substrate comprising an expanded thermoplastic polyurethane substrate coated at least in part with a water-based polyurethane urea solution and/or dispersion, wherein the polyurethane urea comprises polycarbonate structural units and at least one colorant.

Assignees

• Covestro Deutschland Ag

Inventors

• Irnich Rolf
• Michaelis Thomas

Classifications

• C09D175/04 Primary

  Polyurethanes · CPC title

• C09D169/00

  Coating compositions based on polycarbonates; Coating compositions based on derivatives of polycarbonates · CPC title

• C08G18/48

  Polyethers · CPC title

• C08G18/3225

  Polyamines · CPC title

• C08G18/0819

  containing anionic or anionogenic groups · CPC title