Coating agent compositions, coatings made therefrom and exhibiting high scratch resistance and good polishability, and use thereof

Patent metadata

Field	Value
Publication number	US-9371469-B2
Application number	US-201214124972-A
Country	US
Kind code	B2
Filing date	May 23, 2012
Priority date	Jun 9, 2011
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

Compositions comprising (B1) at least one polyisocyanate-group-containing compound (B1) having free or blocked isocyanate groups and a cycloaliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, and (B2) at least one polyisocyanate-group-containing compound (B2) having free or blocked isocyanate groups and an acyclic, aliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, where at least one of component (B1) and component (B2) comprise at least one structural unit selected from the group of structural unit (I)

—NR—(X—SiR″ x (OR′)3- x )  (I),

structural unit (II)

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

and mixtures of two or more of the foregoing, wherein the compound (B1) is in an amount such that the binder fraction of the compound (B1) is between 5% and 45% by weight, based on the sum of the binder fraction of the compound (B1) and of the compound (B2), and the mixture of components (B1) and (B2) includes structural units (I) and structural units (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 has free or blocked isocyanate groups and 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 component (B1), having free or blocked isocyanate groups and having an acyclic, aliphatic polyisocyanate parent structure and/or a polyisocyanate parent structure that has free or blocked isocyanate groups and that is derived from one such acyclic aliphatic polyisocyanate by trimerization, dimerization, urethane formation, biuret formation, uretdione formation and/or allophanate formation,
and

(D) at least one catalyst (D) for the crosslinking of silane groups,
where one or both of component (B1) and component (B2) comprise at least one structural unit selected from the group consisting of the structural unit of the formula (I),
—NR—(X—SiR″ x (OR′) 3-x )  (I),

the structural unit of the formula (II)
—N(X—SiR″ x (OR′) 3-x ) n (X′—SiR″ y (OR′) 3-y ) m   (II),

and mixtures of two or more of the foregoing,
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) the amount of component (B1) is between 5 and 45% by weight, based on the sum of the amount of component (B1) and the amount of component (B2), (ii) the mixture of components (B1) and (B2) includes structural units (I) and structural units (II), and (iii) the coating material composition comprises from 20% to 80% by weight, based on solids content of the coating material composition, of at least one hydroxyl-containing polyacrylate (A) and/or at least one hydroxyl-containing polymethacrylate (A).

2. The coating material composition of claim 1 , characterized in that the amount of component (B1) is between 10% and 40% by weight of the sum of the amount of component (B1) plus the amount of component (B2).

3. The coating material composition claim 1 , characterized in that the amount of the isocyanate-group-containing parent structure of component (B1) is between 5% and 45% by weight of the sum of the amount of the isocyanate-group-containing parent structure of component (B1) plus the amount of the isocyanate-group-containing parent structure of component (B2).

4. The coating material composition of claim 1 , characterized in that the total amount of structural units (I) in the mixture of component (B1) plus component (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 component (B1) plus component (B2) is between 97 and 10 mol %, based on the entirety of the structural units (I) plus (II).

5. The coating material composition of claim 1 , characterized in that the polyisocyanate parent structure of the compound (B1) is the biuret dimer and/or the allophanate dimer and/or the isocyanurate trimer of a cycloaliphatic polyisocyanate and/or the polyisocyanate parent structure of the compound (B2) is the biuret dimer and/or the allophanate dimer and/or the isocyanurate trimer of an acyclic aliphatic polyisocyanate.

6. The coating material composition of claim 1 , characterized in that the polyisocyanate parent structure of the compound (B1) is selected from the group consisting of isophorone diisocyanate, 4,4′-methylenedicyclohexyl diisocyanate, the isocyanurate trimer thereof, the allophanate dimer thereof, the biuret dimer thereof, and mixtures of two or more of the foreogoing, and/or the polyisocyanate parent structure of the compound (B2) is selected from the group consisting of 1,6-hexamethylene diisocyanate, the isocyanurate trimer thereof, the allophanate dimer thereof, the biuret dimer thereof, and mixtures of two or more of the foregoing.

7. The coating material composition of claim 1 , characterized in that the component (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),

the substituents having the definition stated in claim 1 .

8. The coating material composition of claim 1 , characterized in that in component (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 that in the mixture of polyisocyanate component (B1) plus polyisocyanate component (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).

9. The coating material composition of claim 1 , characterized in that component (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 , and where in component (B1) 0 to 34 mol % of the isocyanate groups originally present have undergone reaction to form structural units (I) and/or (II).

10. The coating material composition of claim 1 , characterized in that in the mixture of component (B1) plus component (B2)
the total amount of structural units (I) is between 10 and 50 mol %
and
the total amount of structural units (II) in the mixture of component (B1) plus component (B2) is between 90 and 50 mol %, based in each case 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
the amount of component (B1) is between 15% and 35% by weight of the sum of the amount of component (B1) plus the amount of component (B2).

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

12. A multicoat effect and/or color paint system comprising at least one pigmented basecoat and at least one clearcoat disposed thereon, the clearcoat comprising a film produced from a coating material composition according to claim 1 .

13. A multistage coating process comprising applying a pigmented basecoat film to an optionally precoated substrate, and applying

Assignees

• Groenewolt Matthijs
• Klein Guenter
• Hilge Oliver
• Austrup Berthold
• Huebner Katharina
• Basf Coatings Gmbh

Inventors

• Groenewolt Matthijs
• Klein Guenter
• Hilge Oliver
• Austrup Berthold
• Huebner Katharina

Classifications

• B05D7/56

  Three layers or more · CPC title

• B05D7/53

  Base coat plus clear coat type · CPC title

• C08G18/791

  containing isocyanurate groups · CPC title

• Y10T428/31551

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

• C08G18/6229

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