Low-solvent coating systems for textiles

Patent metadata

Field	Value
Publication number	US-2019017221-A1
Application number	US-201516064861-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Dec 22, 2015
Publication date	Jan 17, 2019
Grant date	—

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

1 .- 15 . (canceled)

16 . 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), at least one polyamine (component B) and ≤30 wt %, based on the total mass of the coating composition, of at least one organic solvent.

17 . The coating composition according to claim 16 , wherein the terminal isocyanate groups of the isocyanate-terminated prepolymer A) come exclusively from the aliphatic polyisocyanates.

18 . The coating composition according to claim 16 , wherein the coating composition comprises ≤10 wt %, based on the total mass of coating composition, of at least one organic solvent.

19 . The coating composition according to claim 16 , wherein the terminal isocyanate groups of the prepolymer A) are blocked with dialkyl malonate.

20 . The coating composition according to claim 16 , wherein component B) comprises at least one diamine or consists exclusively of one or more diamines.

21 . The coating composition according to claim 16 , 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).

22 . The coating composition according to claim 16 , wherein the ratio of the isocyanate groups in component b) to hydroxyl groups in component a) is ≥1.5:1.

23 . The coating composition according to claim 16 , wherein the polyol component a) comprises 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 an average functionality of hydroxyl groups of 1.8 to 3.5.

24 . The coating composition according to claim 16 , wherein the polyol component a) comprises or consists of 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 3.5, 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 1.8 to 3.5.

25 . The coating composition according to claim 16 , wherein component b) has an average NCO functionality of 1.5 to 4.0.

26 . The coating composition according to claim 16 , wherein the weight ratio of component A) to component B) is ≤10:4.

27 . A method for coating substrates, comprising applying the coating composition according to claim 16 to a substrate and crosslinking at 90 to 200° C.

28 . The method according to claim 27 , wherein the substrate is a textile material.

29 . Coated substrate obtained by a method according to claim 27 .

30 . A method comprising utilizing the coating composition according to claim 16 for producing elastic coatings or elastic films.

Assignees

• Covestro Deutschland Ag

Inventors

• Irnich Rolf
• Köcher Jürgen
• Langer Rafael

Classifications

• C08G18/76

  aromatic · CPC title

• C09D175/00 Primary

  Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers · CPC title

• C08G18/78

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

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title

• D06N2211/14

  Furniture, upholstery · CPC title