Coating material compositions and coatings produced therefrom combining high scratch resistance and good polishability and good optical properties, and use thereof

Patent metadata

Field	Value
Publication number	US-10100222-B2
Application number	US-201314649473-A
Country	US
Kind code	B2
Filing date	Oct 18, 2013
Priority date	Dec 3, 2012
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

The present invention provides nonaqueous coating material compositions, multistage coating processes and also the use of the coating material compositions, comprising
(A) at least one polyhydroxyl-group-containing compound, (B1) at least one polyisocyanate-group-containing compound (B1) having free or blocked isocyanate groups and having a cycloaliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, (B2) at least one polyisocyanate-group-containing compound (B2) having free or blocked isocyanate groups and having an acyclic, aliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, (D) at least one catalyst for the crosslinking of silane groups, and (R) at least one rheological assistant (R) based on fumed silica,
where component (B1) and/or component (B2) comprise at least one structural unit

—NR—(X—SiR″ x (OR′)3- x )  (I),

and/or at least one structural unit

—N(X—SiR″ x (OR′)3- x ) n (X′—SiR″ y (OR′)3- y ) m   (II).

First claim

The invention claimed is:

1. A nonaqueous coating material composition comprising
(A) at least one polyhydroxyl-group-containing compound (A),
(B1) at least one polyisocyanate-group-containing compound (B1) having free or blocked isocyanate groups and having a cycloaliphatic polyisocyanate parent structure and/or a polyisocyanate parent structure that is derived from one such cycloaliphatic polyisocyanate by trimerization, dimerization, urethane formation, biuret formation, uretdione formation and/or allophanate formation,
(B2) at least one polyisocyanate-group-containing compound (B2), different from compound (B1), having free or blocked isocyanate groups and having an acyclic, aliphatic polyisocyanate parent structure and/or a polyisocyanate parent structure that is derived from one such acyclic aliphatic polyisocyanate by trimerization, dimerization, urethane formation, biuret formation, uretdione formation and/or allophanate formation,
(D) at least one catalyst (D) for the crosslinking of silane groups,
and
(R) at least one rheological assistant (R) based on fumed silica,
where compound (B1) and/or compound (B2) comprise at least one structural unit of the formula (I)
—NR—(X—SiR″ x (OR′)3- x )  (I),

and/or at least one structural unit of the formula (II)
—N(X—SiR″ x (OR′)3- x ) n (X′—SiR″ y (OR′)3- y ) m   (II),

where
R=hydrogen, alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, where Ra=alkyl, cycloalkyl, aryl or aralkyl,
R′=hydrogen, alkyl or cycloalkyl it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups,
X, X′=linear and/or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms,
R″=alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups,
n=0 to 2, m=0 to 2, m+n=2, and x, y=0 to 2,
with the provisos that
(i) compound (B1) is used in an amount such that the solids content of the binder fraction of the isocyanate-group containing parent structure of compound (B1) is between 5% and 45% by weight of the sum of the solids content of the binder fractions of the isocyanate-group containing parent structures of compound (B1) and compound (B2), and
(ii) the mixture of compounds (B1) plus (B2) includes structural units (I) and structural units (II).

2. The coating material composition of claim 1 , wherein the total amount of structural units (I) in the mixture of compound (B1) plus compound (B2) is between 3 and 90 mol %, based on the entirety of the structural units (I) plus (II), and the total amount of structural units (II) in the mixture of compound (B1) plus compound (B2) is between 10 and 97 mol %, based on the entirety of the structural units (I) plus (II).

3. The coating material composition of claim 1 , wherein the polyisocyanate parent structure of the compound (B1) is isophorone diisocyanate and/or 4,4′-methylene-dicyclohexyl diisocyanate and/or the isocyanurate trimer and/or allophanate dimer and/or biuret dimer thereof, and/or the polyisocyanate parent structure of the compound (B2) is 1,6-hexamethylene diisocyanate and/or the isocyanurate trimer and/or allophanate dimer and/or biuret dimer thereof.

4. The coating material composition of claim 1 , wherein the compound (B2) has been prepared by reacting acyclic aliphatic polyisocyanates and/or a polyisocyanate derived from one such acyclic aliphatic polyisocyanate by trimerization, dimerization, urethane formation, biuret formation, uretdione formation and/or allophanate formation with at least one compound of the formula (Ia)
H—NR—(X—SiR″ x (OR′)3- x )  (Ia)

and/or with at least one compound of the formula (IIa)
HN(X—SiR″ x (OR′)3- x ) n (X′—SiR″ y (OR′)3- y ) m   (IIa),

and/or that
compound (B1) has been prepared by reacting cycloaliphatic polyisocyanates and/or polyisocyanates derived from cycloaliphatic polyisocyanates by trimerization, dimerization, urethane formation, biuret formation, uretdione formation or allophanate formation with at least one compound of formula (Ia) and/or with at least one compound of formula (IIa), the substituents having the definition stated in claim 1 .

5. The coating material composition of claim 1 , wherein
in compound (B1) 0 to 34 mol % of the isocyanate groups originally present have undergone reaction to form structural units (I) and/or (II), and/or
in compound (B2) between 10 and 90 mol % of the isocyanate groups originally present have undergone reaction to form structural units (I) and/or (II), and/or
in the mixture of polyisocyanate compound (B1) plus polyisocyanate compound (B2) between 10 and 80 mol % of the isocyanate groups originally present in (B1) plus (B2) have undergone reaction to form structural units (I) and/or (II).

6. The coating material composition of claim 1 , wherein in the mixture of compound (B1) plus compound (B2)
the total amount of structural units (I) is between 10 and 50 mol %
and
the total amount of structural units (II) is between 50 and 90 mol %, based on the entirety of the structural units (I) plus (II),
and
between 25 and less than 50 mol % of the isocyanate groups originally present in (B1) plus (B2) have undergone reaction to form structural units (I) and (II)
and
compound (B1) is used in an amount such that the binder fraction of the isocyanate-group-containing parent structure of compound (B1) based on solids content is between 15% and 35% by weight, based on the sum of the binder fraction of the isocyanate-group-containing parent structure of compound (B1) based on solids content plus the binder fraction of the isocyanate-group-containing parent structure of compound (B2) based on solids content.

7. The coating material composition of claim 1 , wherein the coating material composition comprises as rheological assistant (R) a mixture of at least one rheological assistant (R1) based on hydrophilic silicas and at least one rheological assistant (R2) based on hydrophobic silicas.

8. The coating material composition of claim 1 , wherein the rheological assistant (R) is used in a total amount of 0.01% to 10% by weight, based on the binder fraction of the coating material composition.

9. The coating material composition of claim 1 , wherein the rheological assistant (R) based on fumed silica has a primary particle size of <50 nm.

10. The coating material composition of claim 1 , wherein the coating material comprises from 20% to 79.98% by weight, based on the binder fraction of the coating material, of at least one hydroxyl-containing polyacrylate (A) and/or at least one hydroxyl-containing polymethacrylate (A).

11. The coating material composition of claim 1 , wherein the coating material composition comprises at least one phosphorus- and nitrogen-containing catalyst (D).

12. A multistage coating process, the process comprising applying a pigmented basecoat film and thereafter a film of the coating material composition according to claim 1 atop an optionally precoated substrate.

13. The multistage coating process of claim 12 , wherein after application of the pigmented basecoat film, the applied basecoat is initially dried at temperatures from room temperature to 80° C., and after the application of the coating material composition, curing takes place at temperatures from 20 to 200° C. for a time of one minute up to 10 hours.

14. A method of producing a clearcoat, the method comprising applying a clearcoat comprising the coating material composition of claim 1 as part of automotive OEM finishing, finishing of part

Assignees

• Basf Coatings Gmbh

Inventors

• Groenewolt Matthijs
• Austrup Berthold
• Hübner Katharina
• Müller Jörg
• Hanning Silke
• Frank Andrea

Classifications

• B05D5/00

  Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures · CPC title

• C08G18/722

  Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates · CPC title

• C08G18/6229 Primary

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title

• C09D175/04

  Polyurethanes · CPC title

• B05D5/061

  Special surface effect · CPC title