Rheological additive for coating compositions

• US 5,034,444 A
• Filed: 06/18/1990
• Issued: 07/23/1991
• Est. Priority Date: 08/26/1988
• Status: Expired due to Term

• Current Assignee: Rheox, Inc. (Elementis PLC)
• Original Assignee: Rheox, Inc. (Elementis PLC)
• Inventors: Smith, Alan, Yun, Han B.
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Sweet, Mark D.
• Application Number:
  US07/539,545
• Time in Patent Office: 400 Days
• Field of Search: 524/223, 524/241, 524/244, 524/245, 524/251, 524/252
• US Class Current: 524/223
• CPC Class Codes: C08L 71/00 Compositions of polyethers obtained by reactions forming an ether link in the main chain of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06; Compositions of derivatives of such polymers
• CPC Class Codes: C09D 7/43 Thickening agents
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence

Abstract

A rheological additive for non-aqueous coating compositions is disclosed. The additive may be the reaction product of an alkoxylated aliphatic nitrogen-containing compound, an aliphatic diamine or mixtures thereof, and an organic polycarboxylic anhydride or acid, an alkanediol polyepoxide ether, or mixtures thereof. The additive provides excellent anti-sag and storage stability properties, particularly for high solids coating compositions, without causing a significant increase in viscosity. Also disclosed are coating compositions containing the additive.

Claims

1. A non-aqueous coating composition comprising;

(a) a non-aqueous coating material selected from the group consisting of polyester-melamine, alkyd-melamine, acrylic-melamine, polyester-urea/formaldehyde, alkyl-urea/formaldehyde, acrylic-urea/formaldehyde, alkyd, epoxy, acrylic, urethane, acrylic urethane and vinyl based oleoresinous coating materials; and

(b) a rheological additive comprising at least one reaction product wherein the reactants comprise;

(i) alkoxylated aliphatic nitrogen-containing compound and organic polycarboxylic anhydride or acid;

(ii) aliphatic diamine and organic polycarboxylic anhydride or acid;

(iii) alkoxylated aliphatic nitrogen-containing compound and alkane diol polyepoxide ether; and

(iv) aliphatic diamine and alkane diol polyepoxide ether;

wherein the alkoxylated aliphatic nitrogen-containing compound has the formula represented by at least one of (I) and (II) ##STR7## wherein R₁ is a straight or branched chain aliphatic alkyl group having 6 to 30 carbon atoms, R is independently selected from hydrogen, methyl and ethyl, q and r are each at least 1, s is 0 or 1 and the sum of q+r is from 2 to 50, ##STR8## wherein R₂ is a straight or branched chain aliphatic alkyl group having 6 to 30 carbon atoms, p is from 1 to 20, R is independently selected from hydrogen, methyl and ethyl, x, y and z are independently selected and can be zero or an integer and the sum of x+y+z is from 1 to 50, and wherein the aliphatic diamine has the formula represented by (III) ##STR9## wherein R₃ is a straight or branched chain aliphatic alkyl group having 6 to 30 carbon atoms and p is from 1 to 20.

2. The non-aqueous coating composition of claim 1 wherein the coating composition contains an organic solvent and from about 15 to about 45 percent by weight of nonvolatile solids.

3. The non-aqueous coating composition of claim 1 wherein the coating composition contains from about 60 to about 100 percent by weight of nonvolatile solids.

4. The non-aqueous coating composition of claim 3 wherein the coating composition contains from about 65 to about 100 percent by weight of nonvolatile solids.

5. The non-aqueous coating composition of claim 4 wherein the coating composition contains from about 75 to about 100 percent by weight of nonvolatile solids.

6. The non-aqueous coating composition of claim 3 wherein the coating material is selected from polyester-melamine, polyester-urea/formaldehyde, alkyd-melamine, acrylic-melamine, acrylic-urea/formaldehyde, epoxy, and polyurethane-based baking enamels and alkyd, acrylic, epoxy, oleoresin, polyurethane, polyvinyl acetate and vinyl acrylic-based air dry paints.