Water borne metallic coating composition

• US 5,039,343 A
• Filed: 04/16/1990
• Issued: 08/13/1991
• Est. Priority Date: 04/17/1989
• Status: Expired due to Term

• Current Assignee: Nippon Paint Company Limited (Rainbow Light Limited)
• Original Assignee: Nippon Paint Company Limited (Rainbow Light Limited)
• Inventors: Nagahata, Satoru, Watanabe, Masakazu, Kuwajima, Teruaki, Okude, Yoshitaka, Konishi, Sakuichi, Umeda, Shinichiro
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): Wright, Alan
• Application Number:
  US07/509,508
• Time in Patent Office: 484 Days
• Field of Search: 106/404, 106/499, 106/403, 106/401
• US Class Current: 106/404
• CPC Class Codes: C08G 18/6254 Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• CPC Class Codes: C08G 18/6266 Polymers of amides or imides from alpha-beta ethylenically unsaturated carboxylic acids
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 61/20 Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen with aminophenols C08L61/04
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C09D 133/066 containing -OH groups
• CPC Class Codes: C09D 5/38 Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36

Abstract

The present invention provides a water borne metallic coating composition which stably disperses a metallic pigment and provides good metallic appearance independently of coating conditions. The water borne coating composition of the present invention comprises a specific film forming polymer (I), a specific fluorine containing compound (II), a metallic pigment (III), a crosslinking agent (IV), a compound (V) selected from the group consisting of a phosphorus containing titanate coupling agent and a phosphoric mono- or di-ester of a C_11- C₂₄ organic compound.

Claims

1. A water borne metallic coating composition comprising:

(I) a film forming polymer having a number average molecular weight of 6,000 to 50,000, prepared by copolymerizing a monomer mixture of 5 to 40% by weight of an amide group containing ethylenic monomer, 3 to 15% by weight of an acid group containing ethylenic monomer, 10 to 40% by weight of a hydroxyl group containing ethylenic monomer and the balance of other ethylenic monomer followed by neutralizing at least a portion of the acid group;

% by weight being based on the total monomer weight,

(II) a fluorine containing compound which has a C_n F_2n+1 -- or --C_n F_2n -- group wherein n is an integer of 1 to 20, and also at least one acid group or a salt of said acid group,

(III) a metallic pigment,

(IV) a crosslinking agent added to crosslink with said polymer (I), which crosslinking agent is selected from at least one group consisting of an amino compound, an isocyanate compound and an epoxy compound,

(V) a compound selected from the group consisting of a phosphorus containing titanate coupling agent and a phosphoric mono- or di-ester of a C₁₁ -C₂₄ organic compound;

wherein said compound (II) is present in an amount of 0.01 to 5 parts by weight, said pigment (III) is present in an amount of 2 to 30 parts by weight, said agent (IV) is present in an amount of 5 to 120 parts by weight and the compound (V) is present in an amount of 0.04 to 30 parts by weight, based on 100 parts by weight of the polymer (I).

2. The water borne metallic coating composition according to claim 1 wherein said amide group containing ethylenic monomer is acrylamide, N-methylolacrylamide, methacrylamide, N-methylolmethacrylamide or alkoxymethyl(meth)acrylamide.

3. The water borne metallic coating composition according to claim 1 wherein said acid group containing ethylenic monomer is acrylic acid, methacrylic acid, crotonic acid, ethacrylic acid, propylacrylic acid, isopropylacrylic acid or t-butylacrylamide sulfonic acid.

4. The water borne metallic coating composition according to claim 1 wherein a portion of said acid group containing ethylenic monomer of the film forming polymer is a half-ester, half-amide or half-thioester of a dibasic acid.

5. The water borne metallic coating composition according to claim 1 wherein said hydroxyl group containing ethylenic monomer is hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxymethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate or allyl alcohol.

6. The water borne metallic coating composition according to claim 1 wherein said fluorine containing compound (II) is CF₃ CO₂ H, C₃ F₇ CO₂ H, C₇ F₁₅ CO₂ H, C₈ F₁₇ CO₂ H, HO₂ C--(CF₂)₄ --CO₂ H, [C₈ F₁₇ SO₂ N(CH₃)C₂ H₄ O]₂ PO(OH), [C₈ F₁₇ SO₂ N(CH₃)C₂ H₄ O]₂ PO(ONH₄), C₈ F₁₇ SO₂ N(CH₃)C₂ H₄ OSO₃ H, C₈ F₁₇ SO₂ N(C₃ H₇)CH₂ CO₂ K, C₈ F₁₇ SO₃ Na, C₈ F₁₇ SO₃ NH₄ or C₈ F₁₇ SO₃ Li.

7. The water borne metallic coating composition according to claim 1 wherein said metallic pigment (III) is aluminum flakes.

8. The water borne metallic coating composition according to claim 1, wherein said metallic pigment (III) before added to said composition is preformulated in the form of a mixture of 100 parts by weight of the metallic pigment and 2 to 100 parts by weight of a reaction product prepared by reacting an organic phosphate (VI) represented by ##STR5## wherein R¹ represents a C₂ -C₂₄ alkyl group, a C₂ -C₂₄ alkenyl group or an aryl group having at least one C₂ -C₂₄ alkyl substituent, R² represents a C₂ -C₄ alkylene group, R³ represents a hydrogen atom, a C₂ -C₂₄ alkyl group, a C₂ -C₂₄ alkenyl group, a C₆ -C₂₄ aryl group, a C₆ -C₂₄ alkaryl group or a R¹ -(OR²)_m -group, and m is 0 or an integer of 1 to 20,

with a fluorine containing compound (VII) having a C_n F_2n+1 --or --C_n F_2n -- group wherein n is an integer of 1 to 20 and at least one primary hydroxyl group or epoxy group, in molar ratio (VI)/(VII) of 1/1 to 1/0.01.

9. The water borne metallic coating composition according to claim 1 wherein said crosslinking agents (IV) are a blocked polyisocyanate, an alkoxylated melamineformaldehyde condensate or an epoxy compound having at least two epoxy group.

10. The water borne metallic coating composition according to claim 1 which further contains a non-metallic pigment, a thickener or a filler.