Aqueous polyacrylate systems for varnishing plastic surfaces

• US 5,139,882 A
• Filed: 01/23/1990
• Issued: 08/18/1992
• Est. Priority Date: 01/28/1989
• Status: Expired due to Fees

• Current Assignee: Rohm GmbH Chemische Fabrik
• Original Assignee: Rohm GmbH Chemische Fabrik
• Inventors: Langerbeins, Klaus, Tessmer, Dieter, Rausch, Ursula, Elser, Wilhelm, Folsch, Karl-Josef
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): Merriam, Andrew E. C.
• Application Number:
  US07/468,942
• Time in Patent Office: 938 Days
• Field of Search: 428/522, 523/201, 524/561, 526/326, 526/318.44
• US Class Current: 428/522
• CPC Class Codes: C08F 2/22 Emulsion polymerisation
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/1806 C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08J 2433/00 Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C09D 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09D151/04, C09D151/06 take precedence
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

Varnishing plastic surfaces with a clear or pigmented aqueous dispersion of a (meth)acrylate copolymer of (a) 20 to 90% by weight of acrylic and/or methacrylic acid alkyl or cycloalkyl esters with 1 to 10 carbon atoms in the ester group; (b) 80 to 10% by weight of acrylic and/or methacrylic acid esters with aromatic groups as the ester group or containing aromatic groups in the ester group; and (c) optionally, small quantities of other monomers, results in the formation of a firmly adhering, water and alcohol resistant finish. The copolymers are preferably emulsion polymers and are synthesized as multiple-phase polymers according to the core-shell model.

Claims

1. A method for preparing a coated plastic article, comprising coating a plastic article with an aqueous dispersion, comprising a (meth)acrylate polymer, wherein said (meth)acrylate polymer is a copolymer comprising:

(a) 20 to 90% by weight of an acrylic acid and/or methacrylic acid alkyl or cycloalkyl ester having 1 to 10 carbon atoms in the ester group;

(b) 80 to 10% by weight of an acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group;

(c) 0 to 5% by weight of a copolymerizable carboxylic acid;

(d) 0 to 10% by weight of a copolymerizable ureido compound; and

(e) 0 to 20% by weight of another copolymerizable monomer.

2. The method of claim 1, wherein said acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group is a compound with the general formula (I):

##STR2## wherein R is H or CH₃ ;

X is CH₂ ;

a is 0, 1, 2, 3, or 4;

or X is a branched C₃ H₆ - or C₄ H₈ - group when X is 1;

Y is 0 or NH;

b is 0 or 1; and

A is a C₆ to C₁₀ aryl radical or C₁ to C₄ alkyl phenyl or naphthyl.

3. The method of claim 1, wherein said copolymer is produced by emulsion polymerization and is a multiple-phase polymer.

4. The method of claim 3, wherein said multiple-phase polymer is a core-shell polymer.

5. The method of claim 1, wherein said acrylic and/or methacrylic acid alkyl or cycloalkyl ester is one or more members selected from the group consisting of methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate.

6. The method of claim 1, wherein said acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group is one or more members selected from the group consisting of phenyl acrylate, p-methylphenyl acrylate, phenyl methacrylate, p-methylphenyl methacrylate, benzyl acrylate, 1-naphthyl methacrylate, benzyl methacrylate, 2-phenylethyl methacrylate, 3-phenyl-n-propyl acrylate, 2-phenoxyethyl methacrylate, 2-(phenylamino)ethyl methacrylate.

7. A coated plastic article, prepared by a process comprising coating a plastic article with an aqueous dispersion comprising a (meth)acrylate polymer, wherein said (meth)acrylate polymer is a copolymer comprising:

(a) 20 to 90% by weight of an acrylic and/or methacrylic acid alkyl or cycloalkyl ester having 1 to 10 carbon atoms in the ester group;

(b) 80 to 10% by weight of an acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group;

(c) 0 to 5% by weight of a copolymerizable carboxylic acid;

(d) 0 to 10% by weight of a copolymerizable ureido compound; and

(e) 0 to 20% by weight of another copolymerizable monomer.

8. The article of claim 7, wherein said acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group is a compound with the general formula (I):

##STR3## wherein R is H or CH₃ ;

X is CH₂ ;

a is 0, 1, 2, 3, or 4;

or X is a branched C₃ H₆ - or C₄ H₈ - group, when X is 1;

Y is 0 or NH;

b is 0 or 1; and

A is a C₆ to C₁₀ aryl radical or C₁ to C₄ alkyl phenyl or naphthyl.

9. The article of claim 7, wherein said copolymer is produced by emulsion polymerization and is a multiple-phase polymer.

10. The article of claim 9, wherein said multiple-phase polymer is a core-shell polymer.

11. The article of claim 7, wherein said acrylic and/or methacrylic acid alkyl or cycloalkyl ester is one or more members selected from the group consisting of methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate.

12. The article of claim 7, wherein said acrylic and/or methacrylic acid ester with an aromatic group as the ester group or containing an aromatic group in the ester group is one or more members selected from the group consisting of phenyl acrylate, p-methylphenyl acrylate, phenyl methacrylate, p-methylphenyl methacrylate, 1-naphthyl methacrylate, benzyl methacrylate, benzyl acrylate, 2-phenylethyl methacrylate, 3-phenyl-n-propyl acrylate, 2-phenoxyethyl methacrylate, 2-(phenylamino)ethyl methacrylate.

13. The article of claim 7, wherein said plastic article comprises a polymer selected from the group consisting of polystyrene, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, poly(methyl methacrylate), polyphenylene oxide, polyvinyl chloride and a blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer.