# US 5,705,559 A · Crosslinked resin particles and production thereof

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- Number: US 5,705,559 A
- Document ID: US5705559A
- Status: Granted
- Kind: A
- Application number: 08/391,091
- Filed: 1995-02-21
- Granted: 1998-01-06
- Earliest claimed: 1988-07-08
- Assignees: Nippon Paint Co., Ltd.
- Inventors: Hiroyuki Sakamoto; Kenshiro Tobinaga; Yasuyuki Tsuchiya; Hisaichi Muramoto; Yusuke Ninomiya; Keizou Ishii; Shinichi Ishikura
- Web page: https://patentgrep.com/patent/US5705559A

## CPC

- C08C 19/36: with carboxy radicals
- C08J 3/26: of latex
- C09D 5/4492: {containing special additives, e.g. grinding agents}
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)

## Abstract

Disclosed is a process for preparing crosslinked resin particles which comprises dispersing a resin having both a water-dispersible function and a self-crosslinkable function in one molecule in an aqueous medium and then three-dimensionally crosslinking.

## Claims

### Claim 1

A process for preparing crosslinked resin particles which comprises dispersing in an aqueous medium a water-dispersible resin having both water-dispersible groups and self-crosslinkable groups in one molecule and then three-dimensionally crosslinking said resin, wherein said water-dispersible groups are selected from the group consisting of nonionic groups, ionic groups, and amphoteric groups, and said self-crosslinkable groups are selected from the group consisting of methacryloyl groups, acryloyl groups, 2-(1-carboxypropenoyl) groups and a combination of groups reactive with each other selected from a combination of oxirane and carboxyl groups or a combination of hydroxyl and alkoxy groups.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the cross-linked resin particles thus-produced are subsequently separated from the aqueous medium.

### Claim 3 (depends on 1)

The process according to claim 1 wherein said water-dispersible resin is an adduct of aminated polybutadiene and methacrylic acid, or a half ester of maleic polybutadiene and 2-hydroxyethyl methacrylate.

### Claim 4 (depends on 1)

The process according to claim 1 wherein said three-dimensionally crosslinking is assisted by a crosslinking catalyst or a polymerization initiator.

### Claim 5 (depends on 1)

The process according to claim 1 wherein said resin particles have a particle size of 0.01 to 50 micron.

### Claim 6 (depends on 1)

The process according to claim 1 wherein said resin particles have a particle size of 0.01 to 10 micron.

### Claim 7 (depends on 1)

The process according to claim 1 wherein said water-dispersible resin having both water-dispersible groups and self-crosslinkable groups has an average molecular weight of 500 to 1,000,000.

### Claim 8 (depends on 7)

The process according to claim 7 wherein said resin has an average molecular weight of 1,000 to 100,000.

### Claim 9 (depends on 7)

The process according to claim 7 wherein said water-dispersible resin is selected from the group consisting of acryl resin, a polyester and an elastomer.

### Claim 10 (depends on 1)

An aqueous emulsion containing the crosslinked resin particles produced according to the process of claim 1.

### Claim 11 (depends on 2)

A process for preparing an aqueous emulsion containing crosslinked resin particles, comprising redispersing the resin particles prepared by the process according to claim 2 in an aqueous medium.

### Claim 12 (depends on 2)

Crosslinked resin particles prepared by the process according to claim 2.

### Claim 13 (depends on 2)

A cationically electrocoating composition containing the crosslinked resin particles prepared by the process according to claim 2.