Silane-based coating composition

Patent metadata

Field	Value
Publication number	US-2022213346-A1
Application number	US-202017608337-A
Country	US
Kind code	A1
Filing date	May 6, 2020
Priority date	May 6, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

Described herein is a coating composition including one or more resins of formula R—[NH—CO—NR 1 —R 2 —Si(R a ) 3-x (R b ) x ] y one or more catalysts of formula [H 3 C—C(R c )(R d )—C(═O)—O − ] z M z+ and one or more aprotic organic solvents. Also described herein are a method of coating a substrate with the above coating composition, a thus coated substrate, and a multilayer coating and a substrate coated with such multilayer coating.

First claim

1 . A coating composition comprising
(A) one or more resins of formula (I)
R—[NH—CO—NR 1 —R 2 —Si(R a ) 3-x (R b ) x ] y   (I)

wherein
R is an aliphatic hydrocarbyl group, optionally containing one or more moieties selected from the group consisting of isocyanurate groups, uretdione groups, iminooxadiazinedione groups, allophanate groups and biuret groups;
R 1 is an alkyl group containing 1 to 10 carbon atoms,
R 2 is an alkylene group containing 1 to 6 carbon atoms,
R a is an alkoxy group containing 1 to 4 carbon atoms,
R b is an alkyl group containing 1 to 4 carbon atoms or an alkoxy group containing 1 to 4 carbon atoms,
x being 0 or 1, and
y being 2 to 5;
(B) one or more catalysts of formula (II)
z [H 3 C—C(R c )(R d )—C(═O)—O − ]M z+   (II)

wherein
R c and R d independently are hydrogen or alkyl groups containing 1 to 6 carbon atoms, with the proviso that the sum of the number of carbon atoms in residues R c and R d ranges from 2 to 7; and z=1 to 4; with the proviso that,
if z=1, then M is selected from the group consisting of Li, K and Na;
if z=2, then M is selected from the group consisting of Zn and Zr;
if z=3, then M is selected from the group consisting of Bi and Al;
if z=4, then M is selected from the group consisting of Zr and Ti; and
(C) one or more aprotic organic solvents.

2 . The coating composition according to claim 1 , characterized in that in formula (I)
R is selected from the group consisting of a diisocyanate from which the isocyanate groups were formally subtracted or its oligomers from which the isocyanate groups were formally subtracted, and/or R 1 is an alkyl group containing 2 to 8 carbon atoms, and/or R 2 is an alkylene group containing 1 to 3 carbon atoms, and/or R a is an alkoxy group containing 1 to 3 carbon atoms, and/or R b is a methyl group or an alkoxy group having 1 or 2 carbon atoms, and/or x=0, and/or y=2 to 4.

3 . The coating composition according to claim 1 , characterized in that in formula (II) the sum of the number of carbon atoms in residues R c and R d ranges from 5 to 7 and/or z=1 or 3.

4 . The coating composition according to claim 1 , characterized in that the one or more catalysts of formula (II) are the neodecanoates and/or ethylhexanoates of potassium or lithium.

5 . The coating composition according to claim 1 , characterized in that the one or more aprotic organic solvents (C) are selected from the group consisting of aliphatic and/or aromatic hydrocarbons, ketones, esters, and mixtures of the afore-mentioned solvents.

6 . The coating composition according to claim 1 , characterized in that it further comprises one or more catalysts (B2) selected from the group consisting of bicyclic tertiary amines.

7 . The coating composition according to claim 6 , characterized in that it further comprises one or more carboxylic acids (D) of formula (III)
H 3 C—C(R e )(R f )—C(═O)—OH  (III)
wherein R e and R f independently are hydrogen or alkyl groups containing 1 to 6 carbon atoms, with the proviso that the sum of the number of carbon atoms in residues R c and R d ranges from 2 to 7.

8 . The coating composition according to claim 7 , characterized in that it further comprises one or more epoxy functional compounds (E) of formula (IV)
(X) n —R 3 —Ox  (IV)

wherein Ox is an oxirane group; R 3 is an aliphatic hydrocarbyl group containing 2 to 15 carbon atoms and optionally comprising ether groups and/or ester groups; n=1 to 5; and the n X groups are independently of each other Ox or —Si(R g ) 3-v (R h ) v , wherein v=0 or 1, R g is an alkoxy group containing 1 to 4 carbon atoms, and R h is an alkyl group containing 1 to 4 carbon atoms or an alkoxy group containing 1 to 4 carbon atoms.

9 . The coating composition according to claim 8 , characterized in that it further contains one or more coating additives (F).

10 . The coating composition according to claim 9 , comprising
25 to 95 wt.-% of the (A) one or more resins of formula (I), based on the total weight of the coating composition; 1 to 50 mmol of the (B) one or more catalysts of formula (II) per 100 g of (A); 1 to 70 wt.-% of the (C) one or more aprotic solvents, based on the total weight of the coating composition; 0 to 80 wt.-% of the (D) one or more carboxylic acids of formula (III), based on the total weight of (B); 0 to 20 wt.-% of the (E) one or more epoxy functional compounds of formula (IV), based on the solids content of the coating composition; 0 to 20 wt.-% of the (F) one or more coating additives; and, if present, catalyst (B2) in a ratio of (B) to (B2) being from 1:1 to 1:8.

11 . The coating composition of claim 1 , characterized in that it is a clearcoat composition.

12 . A method of coating a substrate with a coating composition, the method comprising
a. applying a coating composition as defined in claim 1 onto a substrate to form a coating layer; and b. curing the coating layer at a temperature in the range from 10° C. to 180° C.

13 . A coated substrate obtained according to the method of claim 12 .

14 . The coated substrate according to claim 13 , characterized in that the substrate is selected from the group consisting of bodies of means of transportation or parts thereof; interior or exterior constructions; furniture; windows; doors; plastics moldings; small industrial parts; coils; containers; packaging; white goods; sheets; optical, electrical and mechanical components; glassware; and articles of everyday use.

15 . A multilayer coating comprising at least two coating layers, wherein at least one of the coating layers is formed from a coating composition according to claim 1 .

16 . A substrate coated with a multilayer coating as defined in claim 15 .

Assignees

• Basf Coatings Gmbh

Inventors

• Winsberg Jan
• Klein Guenter
• Wessling Elisabeth
• Homann Karin
• Schroeder Stefanie
• Wenking Ulrike
• Hilge Oliver
• Zaminer Jan
• Michel Kristin
• Hoffmann Peter

Classifications

• C08G18/792 Primary

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C08G18/798

  containing urethdione groups · CPC title

• C08G77/26

  nitrogen-containing groups · CPC title

• C08G77/18

  to alkoxy or aryloxy groups · CPC title

• C09D175/04 Primary

  Polyurethanes · CPC title