Aqueous preparations having soft-feel properties

Patent metadata

Field	Value
Publication number	US-9598596-B2
Application number	US-201113880400-A
Country	US
Kind code	B2
Filing date	Oct 17, 2011
Priority date	Oct 19, 2010
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

An aqueous preparation having soft-feel properties comprises: A) an aqueous polyurethane-polyurea dispersion, B) a hydroxy-functional polyacrylate copolymer dispersion and C) a polyisocyanate, which may have been hydrophilically modified. The copolymer dispersion B) further comprises a hydroxy-functional polycarbonate diol D) as a reactive diluent. The invention also concerns a process for producing coatings with such preparations, a substrate coated with such a preparation and the use of the preparation for the production of soft-feel coatings.

First claim

The invention claimed is:

1. An aqueous composition having soft-feel properties and comprising:
A) an aqueous polyurethane-polyurea dispersion wherein the polyurethane-polyurea consists of the following units:
a1) 20 to 94.5% by weight polyols selected from the group consisting of

linear polyester diols or polyester polyols made from acids or anhydrides selected from the group consisting of adipic, decanedicarboxylic, terephthalic, isophthalic, o-phthalic, tetrahydrophthalic, hexahydrophthalic and acid anhydrides, and alcohols selected from the group consisting of ethanediol, di-, tri-, tetraethylene glycol, 1,2-propanediol, di-, tri-, tetrapropylene glycol, butane-1,4-diol, hexane-1,6-diol, 2,2-dimethyl-1,3-propanediol, 1,4-dimethylolcyclohexane and mixtures thereof, with or without the use of polyols of higher functionality;
copolymers of hexane-1,6-diol, ε-caprolactone with diphenyl and/or dialkyl carbonates; and
hydroxyl-containing polycarbonates prepared by reacting diols selected from the group consisting of 1,4-butanediol, 1,6-hexanediol, and mixtures thereof, with diaryl carbonates;
a2) 0 to 30% by weight diols selected from the group consisting of 1,2-ethanediol, 1,4-butanediol, 1,6-hexanediol, 2,2-dimethylpropane-1,3-diol, and mixtures thereof;
a3) 0 to 10% by weight nonionic hydrophilicizer based on a copolymer of ethylene oxide and propylene oxide;
a4) 4.5 to 50% by weight di- or polyisocyanates selected from the group consisting of 1,6-diisocyanatohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (isophorone diisocyanate), 4,4′-diisocyanatodicyclohexylmethane, 1-isocyanato-1-methyl-4(3)isocyanatomethylcyclohexane, 1,3- and 1,4-bis(2-isocyanatoprop-2-yl)benzene, and mixtures thereof;
a5) 0.5 to 13% by weight aliphatic and/or alicyclic primary and/or secondary polyamines selected from the group consisting of 1,2-ethanediamine, 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane (isophoronediamine), piperazine, diethylenetriamine, hydrazine, hydrazine hydrate, and mixtures thereof; and
a6) 0.5 to 8% by weight diamines or polyamines containing alkali metal salts of N-(2-aminoethyl)-2-aminoethanesulphonic acid;

B) a hydroxy-functional polyacrylate copolymer dispersion prepared from 2-ethyl hexyl acrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, butyl acrylate, butyl methacrylate, isobornyl methacrylate, styrene, methyl methacrylate, acrylic acid or mixtures thereof, and
C) a polyisocyanate, which is optionally hydrophilically modified,
wherein the copolymer dispersion B) further comprises a hydroxy-functional polycarbonate diol D) as a reactive diluent,
wherein the composition has a haptic testing result of 1.

2. The composition according to claim 1 , wherein the hydroxy-functional polycarbonate polyol D) has an average hydroxyl functionality of ≧1.6 to ≦6 and a number average molecular weight of ≧240 g/mol to ≦5000 g/mol.

3. The composition according to claim 1 , wherein the hydroxy-functional polycarbonate polyol D) is prepared from 1,4-butane diol, 1,6-hexane diol, 3-methyl-1,5-pentane diol or mixtures thereof.

4. The composition according to claim 1 , wherein the hydroxy-functional polycarbonate polyol D) is prepared from 1,6-hexane diol and ε-caprolactone.

5. The composition according to claim 1 , wherein the hydroxy-functional polycarbonate polyol D) has an average hydroxyl functionality of ≧1.9 to ≦2.05.

6. The composition according to claim 1 , wherein the polycarbonate polyol D) is present in an amount of ≧40 weight-% to ≦80 weight-% with respect to the solid content of the copolymer dispersion B).

7. The composition according to claim 1 , wherein the polyisocyanate C) comprises hexamethylene diisocyanate.

8. The aqueous composition according to claim 1 , wherein the polyisocyanate C) is hydrophilically modified.

9. A process for producing coatings which comprises applying a coating composition comprising the composition of claim 1 to a substrate and subsequently curing the coating composition to form a coating.

10. A substrate coated with the composition of claim 1 .

11. The coated substrate of claim 10 , wherein the substrate is a flexible and/or stretchable substrate made of thermoplastic and/or thermoset polymers.

12. A process for the production of soft-feel coatings comprising applying a coating composition comprising the composition of claim 1 to a substrate and subsequently curing the coating composition to form a coating.

13. The process according to claim 12 , wherein the soft-feel coatings are automobile interior coatings.

Assignees

• Münzmay Thomas
• Münzmay Alice
• Covestro Deutschland Ag

Inventors

• Münzmay Thomas

Classifications

• C09D133/14 Primary

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• C08G18/706

  the liquid medium being water · CPC title

• C09D133/066

  containing -OH groups · CPC title

• C09D175/06

  from polyesters · CPC title

• Y10T428/31551

  Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] · CPC title