# US 4,395,444 A · Thermosetting cationic acrylic latex compositions containing blocked isocyanates

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- Number: US 4,395,444 A
- Document ID: US4395444A
- Status: Granted
- Kind: A
- Application number: 06/305,566
- Filed: 1981-09-25
- Granted: 1983-07-26
- Earliest claimed: 1981-09-25
- Assignees: PPG Industries, Inc.
- Inventors: Suryya K. Das; Charles M. Kania
- Web page: https://patentgrep.com/patent/US4395444A

## CPC

- C08F 2/28: cationic
- C09D 133/066: {containing -OH groups}
- C08L 75/04: Polyurethanes
- Y10T 428/31692: Next to addition polymer from unsaturated monomers
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An improved cationic thermosetting latex, coating compositions prepared therefrom, articles coated therewith, and the process for preparing the same are disclosed. Compositions of the instant latices formulated with isocyanate curing agents display improved cure; the improvement residing in selection of surfactants, with particular reference to their gegen-ions, which are used therein.

## Claims

### Claim 1

A stable thermosetting cationic acrylic latex composition, comprising a blocked isocyanate curing agent and a cationic acrylic latex; the cationic acrylic latex is prepared by a process which comprises copolymerizing in an acidic medium, in the presence of a cationic surfactant, ethylenically unsaturated monomers, at least one of which contains an active hydrogen group; the cationic surfactant comprises a gegen-ion derived from an aliphatic or aromatic sulfonic acid selected from the group consisting of methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, phenolsulfonic acid and cresolsulfonic acid.

### Claim 2 (depends on 1)

A thermosetting latex of claim 1, wherein the acid is an aliphatic sulfonic acid wherein the aliphatic moiety is a lower alkyl group containing from 1 to 4 carbon atoms.

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 4)

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

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 6)

A process for providing a protective coating for a substrate, said process comprising:
(i) applying a coating composition as set forth in claim 6 to the surface of the substrate; and
(ii) heating the coated substrate at a temperature sufficient to effect cure.