Thermosetting catonic acrylic latices and their use in coating compositions

• US 4,380,601 A
• Filed: 09/25/1981
• Issued: 04/19/1983
• Est. Priority Date: 09/25/1981
• Status: Expired due to Fees

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Kania, Charles M., Das, Suryya K., Dowbenko, Rostyslaw, Christenson, Roger M., Welsh, David A.
• Primary Examiner(s): Pertilla, Theodore E.
• Application Number:
  US06/305,585
• Time in Patent Office: 571 Days
• Field of Search: 260/29.2 TN, 260/29.6 NR, 260/29.6 MP, 524/555, 524/591, 524/560, 524/141, 524/145, 524/251, 524/566
• US Class Current: 524/555
• CPC Class Codes: C08F 2/28 cationic
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C09D 133/066 containing -OH groups
• CPC Class Codes: Y10T 428/31605 Next to free metal

Abstract

A cationic thermosetting latex, coating compositions prepared therefrom, and the process for providing a protective coating are disclosed. The thermosetting latex comprises a blocked isocyanate curing agent and a cationic acrylic latex which is prepared by copolymerizing ethylenically unsaturated monomers, at least one of which contains an active hydrogen group, in an acidic medium in the presence of a cationic surfactant, of which the gegen-ion is derived from certain phosphorous-containing acids. Such latices, when formulated into coating compositions, provide corrosion-resistant coatings.

Claims

1. A stable thermosetting cationic acrylic latex composition, comprising a blocked isocyanate curing agent and a cationic acrylic latex;

the cationic acrylic latex being prepared by a process which comprises copolymerizing ethylenically unsaturated monomers, at least one of which contains an active hydrogen group, in an acidic medium in the presence of water, a polymerization initiator and a cationic surfactant which has a gegen-ion derived from an acid selected from the group consisting of phosphoric acid, phosphorous acid, hypophosphorous and alkyl or aryl hydrogen phosphate.

2. A thermosetting latex of claim 1, wherein the acid is hypophosphorous acid.

3. A thermosetting latex of claim 1, wherein the latex contains an amino group.

4. A thermosetting latex of claim 3, wherein the amino group is derived from an ethylenically unsaturated monomer containing an amino group.

5. A coating composition comprising the acrylic latex composition as in claim 1.