Low-solvent coating systems for textiles

Patent metadata

Field	Value
Publication number	US-10787765-B2
Application number	US-201516064861-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Dec 22, 2015
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

Provided is a coating composition for the elastic coating of textile materials, comprising at least one blocked, isocyanate-terminated prepolymer (component A), the isocyanate-terminated prepolymer A) being prepared from a polyol component a) IN and an isocyanate component b), and the terminal isocyanate groups being blocked with dialkyl malonate and/or 3,5-dimethylpyrazole, and the isocyanate component b) containing ≥70 wt % of at least one aliphatic polyisocyanate and ≤30 wt % of at least one N aromatic polyisocyanate, based on the total weight of component b), at least one polyamine (component B) and ≤30 wt %, based on the total mass of the coating composition, of at least one organic solvent. Further provided are a method for coating substrates with the coating composition, and also the substrate obtainable in such a method, and, further, the use of the coating composition for producing elastic coatings or elastic films.

First claim

The invention claimed is:

1. A coating composition for the elastic coating of textile materials, comprising
at least one blocked, isocyanate-terminated prepolymer (component A), the isocyanate-terminated prepolymer A) being prepared from a polyol component a) and an isocyanate component b), and the terminal isocyanate groups being blocked with dialkyl malonate and/or 3,5-dimethylpyrazole, and the isocyanate component b) containing ≥70 wt % of at least one aliphatic polyisocyanate and ≤30 wt % of at least one aromatic polyisocyanate, based on the total weight of component b), the polyol component a) comprises a mixture comprising at least one polyol having a number-average molecular weight Mn of 2500 to 7000 g/mol, determined by means of GPC in tetrahydrofuran at 23° C., and having an average OH functionality of 1.8 to 3.0, and at least one polyol having a number-average molecular weight Mn of 300 to 1000 g/mol, determined by means of GPC in tetrahydrofuran at 23° C., and having an average OH functionality of 2.8 to 3.5;
at least one polyamine (component B) and
≤30 wt %, based on the total mass of the coating composition, of at least one organic solvent, and wherein the composition forms an elastic coating having an elongation at break of ≥200%, a tensile strength of ≥2 MPa and a 100% modulus of ≥0.2 MPa according to DIN 53504.

2. The coating composition according to claim 1 , wherein the terminal isocyanate groups of the isocyanate-terminated prepolymer A) come exclusively from the aliphatic polyisocyanates.

3. The coating composition according to claim 1 , wherein the coating composition comprises ≤10 wt %, based on the total mass of coating composition, of at least one organic solvent.

4. The coating composition according to claim 1 , wherein the terminal isocyanate groups of the prepolymer A) are blocked with dialkyl malonate.

5. The coating composition according to claim 1 , wherein component B) comprises at least one diamine or consists exclusively of one or more diamines.

6. The coating composition according to claim 1 , wherein component b) comprises ≥80 wt % of at least one aliphatic polyisocyanate and ≤20 wt % of at least one aromatic polyisocyanate, based on the total weight of component b).

7. The coating composition according to claim 1 , wherein the ratio of the isocyanate groups in component b) to hydroxyl groups in component a) is ≥1.5:1.

8. The coating composition according to claim 1 , wherein component b) has an average NCO functionality of 1.5 to 4.0.

9. The coating composition according to claim 1 , wherein the weight ratio of component A) to component B) is ≤10:4.

10. A method for coating substrates, comprising applying the coating composition according to claim 1 to a substrate and crosslinking at 90 to 200° C.

11. The method according to claim 10 , wherein the substrate is a textile material.

12. Coated substrate obtained by a method according to claim 10 .

13. A method comprising applying to a textile substrate the coating composition according to claim 1 in order to produce elastic coatings or elastic films.

Assignees

• Covestro Deutschland Ag
• Covestro Deutschalnd AG

Inventors

• Irnich Rolf
• Köcher Jürgen
• Langer Rafael

Classifications

• D06N2211/106

  Footwear · CPC title

• C08G18/485

  containing mixed oxyethylene-oxypropylene or oxyethylene-higher oxyalkylene end groups · CPC title

• C08G18/78

  Nitrogen {(C08G18/775, C08G18/776 take precedence)} · CPC title

• C08G18/8093

  Compounds containing active methylene groups · CPC title

• C08G18/4804

  Two or more polyethers of different physical or chemical nature · CPC title