(METH)ACRYLATED MELAMINE FORMALDEHYDE RESINS

• US 20110230586A1
• Filed: 08/02/2010
• Published: 09/22/2011
• Est. Priority Date: 08/05/2009
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Roesch, Christine, Schwalm, Reinhold
• Granted Patent: US 8,415,437 B2
• Time in Patent Office: Days
• US Class Current: 522/149
• CPC Class Codes: C08F 299/065 from polyurethanes with side or terminal unsaturations
• CPC Class Codes: C08G 12/32 Melamines
• CPC Class Codes: C09D 161/28 with melamine
• CPC Class Codes: C09D 4/06 Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00

Abstract

The present invention relates to melamine-formaldehyde resins bearing (meth)acrylic groups, to processes for preparing them, to their use, and to coating compositions comprising them.

Claims

1. A radiation-curable compound obtained by a process comprising reacting at least one melamine-formaldehyde resin with at least one compound of the formula (I),

2. A compound according to claim 1, wherein Y is 1,2-ethylene, 1,2-propylene or 1,3-propylene.

3. A compound according to claim 1, wherein R³ and R⁴ are hydrogen.

4. A compound according to claim 1, wherein the melamine-formaldehyde resin is a compound of the formula

Mel-N₃ FA_fA R⁵_mA H_6-fA

in which

Mel-N₃ is a melamine radical formed by imaginary abstraction of the six hydrogen atoms attached to the amino groups in melamine,

FA is a group —

CH₂—

O—

,

R⁵ is a C₁-C₈ alkyl group,

f_A can adopt any desired values from 3.6 to a maximum of 6.0, and

m_A can be values from at least 2.0 to f_A.

5. A compound according to claim 4, wherein R⁵ is selected from the group consisting of methyl, ethyl, and butyl.

6. A coating composition comprising

at least one radiation-curable compound according to claim 1,

optionally, at least one reactive diluent,

optionally, at least one solvent,

optionally, further, typical coatings additives, and

at least one photoinitiator.

7. A primer, surfacer, pigmented topcoat material or clearcoat material in the field of automotive refinish, large-vehicle finishing or aircraft, comprising the coating material of claim 6.

8. A process for preparing a compound according to claim 1, which comprises reacting at least one melamine-formaldehyde resin with at least one (meth)acrylate bearing carbamate groups, at acidic pH.

9. The process according to claim 8, wherein the reaction is conducted in the presence of at least one reactive diluent.