Radiation-curable formulations with high adhesion

Patent metadata

Field	Value
Publication number	US-9809724-B2
Application number	US-201314420071-A
Country	US
Kind code	B2
Filing date	Aug 1, 2013
Priority date	Aug 9, 2012
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Described are radiation-curable formulations which produce coatings having high adhesion to sheets and low contraction. Also described is use of the radiation-curable formulations, and processes for coating sheets by means of these formulations.

First claim

What is claimed is:

1. A radiation-curable formulation comprising
(A) 20 to 50 weight % of at least one condensation resin synthesized from urea or urea derivatives a1) and ketones or aldehydes a2) selected from C—H acidic aldehydes and ketones or mixtures thereof with formaldehyde,
(B) 20 to 40 weight % of at least one radiation-curable compound having at least 2 acryloyl or methacryloyl groups,
(C) 2 to 10 weight % of at least one radiation-curable compound having free acid groups,
(D) 10 to 30 weight % of at least one (meth)acrylic acid alkyl ester whose alkyl radical has at least 8 carbon atoms,
(E) 1 to 10 weight % of at least one coating auxiliary and/or additive, and
(F) 0.5 to 5 weight % at least one photoinitiator,
wherein:
amounts for components (A), (B), (C), (D), (E), and (F) sum to 100 weight %, and
the formulation has an acid number of 10 to 100 mg KOH/g, based on the sum of components (A) to (F).

2. The formulation of claim 1 , wherein component (a1) is urea.

3. The formulation of claim 1 , wherein component (a2) comprises CH-acidic aldehydes or mixtures thereof with formaldehyde.

4. The formulation of claim 1 , wherein component (B) comprises an ester of (meth)acrylic acid with a compound according to one of formula (IVa) to (IVd),

wherein
R 5 and R 6 independently of one another are hydrogen or are C 1 -C 18 -alkyl optionally substituted with aryl, alkyl, aryloxy, alkyloxy, heteroatoms and/or heterocycles,
k, l, m and q independently of one another are each an integer from 1 to 10, and
i is 1 to k, 1 to I, 1 to m, and 1 to q, independently of one another, and
X is selected from the group —CH 2 —CH 2 —O—, —CH 2 —CH(CH 3 )—O—, —CH(CH 3 )—CH 2 —O—, —CH 2 —C(CH 3 ) 2 —O—, —C(CH 3 ) 2 —CH 2 —O—, —CH 2 —CHVin-O—, —CHVin-CH 2 —O—, —CH 2 —CHPh-O—, and —CHPh-CH 2 —O—,
wherein Ph is phenyl and Vin is vinyl.

5. The formulation of claim 1 , wherein component (C) comprises compounds of formulae (Va) or (Vb), and mixtures thereof,

wherein
R 7 is C 2 to C 6 alkylene and
R 8 is hydrogen or methyl.

6. The formulation of claim 1 , wherein component (D) is selected from the group consisting of n-octyl acrylate, 2-ethylhexyl acrylate, 3-propylheptyl acrylate, n-decyl acrylate, lauryl acrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, 3-propylheptyl methacrylate, n-decyl methacrylate, and lauryl methacrylate.

7. A process for coating sheets, the process comprising applying the formulation of claim 1 to a sheet of paper and/or nonwovens which have been impregnated with melamine-formaldehyde resins, carrying out at least partial radiation curing, optionally, applying a decorative print, subsequently applying at least one further radiation-curable coating material, and, finally, carrying out complete curing by radiation.

8. A coated sheet of paper and/or a coated nonwoven comprising a sheet of paper and/or a nonwoven impregnated with a melamine-formaldehyde resin that has been coated with the formulation of claim 1 .

9. A coating process comprising applying the sheet of claim 8 to a substrate selected from wood, woodbase material, wood containing, and combinations thereof.

Assignees

• Basf Se

Inventors

• Becker Axel
• Beck Erich
• Biehler Manfred

Classifications

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• B05D3/067

  Curing or cross-linking the coating · CPC title

• D21H19/20

  comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08L61/24

  with urea or thiourea · CPC title

• C09D133/00

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title