# US 5,344,874 A · Process for producing a condensed resin dispersion

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- Number: US 5,344,874 A
- Document ID: US5344874A
- Status: Granted
- Kind: A
- Application number: 07/726,763
- Filed: 1991-07-08
- Granted: 1994-09-06
- Earliest claimed: 1988-09-28
- Assignees: Asahi Glass Company, Limited
- Inventors: Takao Doi; Noriko Itaya; Masami Yamashita; Nobuaki Kunii
- Web page: https://patentgrep.com/patent/US5344874A

## CPC

- C08G 18/40: High-molecular-weight compounds {(C08G18/2805 takes precedence)}
- C08G 18/0876: {the dispersing or dispersed phase being a polyol}
- C08G 18/409: {Dispersions of polymers of C08G in organic compounds having active hydrogen}
- C08G 18/54: Polycondensates of aldehydes
- C08G 2101/00: Manufacture of cellular products
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A process for producing a condensed resin dispersion, which comprises subjecting an aldehyde and a compound condensable with the aldehyde, or their precondensate, to a condensation reaction in a dispersion medium consisting essentially of water and/or an organic solvent, to precipitate fine condensed resin particles which hardly settle in said dispersion medium, and then replacing the water and/or the organic solvent by an active hydrogen-containing compound having at least two active hydrogen-containing groups reactive with isocyanate groups.

## Claims

### Claim 1

A process for producing a condensed resin dispersion, which comprises subjecting an aldehyde and a compound having two sites reactive with the aldehyde, or their precondensate, to a condensation reaction in a dispersion medium consisting essentially of water and/or an organic solvent, to precipitate a condensed aldehyde resin as fine condensed resin particles with a particle size of from 0.01 to 5 .mu.m in said dispersion medium, then adding an active hydrogen-containing compound having at least two active hydrogen-containing groups reactive with isocyanate groups, and then removing the water and/or organic solvent by vaporization.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the removal of the water and/or the organic solvent is conducted by vaporization under heating and/or under reduced pressure.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the active hydrogen-containing compound has a boiling point or decomposition point higher than the boiling point of the water and/or the organic solvent used.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the active hydrogen-containing compound has from 2 to 8 hydroxyl groups and/or amino groups and has a molecular weight of from 100 to 10,000 per active hydrogen-containing group.

### Claim 5 (depends on 4)

The process according to claim 4, wherein the active hydrogen-containing compound is a polyether polyol having from 2 to 8 hydroxyl groups and polyoxyalkylene chains and having a molecular weight of from 600 to 10,000 per hydroxyl group.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the dispersion medium consisting essentially of water and/or an organic solvent, contains a particle dispersion stabilizer.

### Claim 7 (depends on 6)

The process according to claim 6, wherein the particle dispersion stabilizer is a surfactant.

### Claim 8 (depends on 6)

The process according to claim 6, wherein the particle dispersion stabilizer is a polyisocyanate compound.

### Claim 9 (depends on 6)

The process according to claim 6, wherein the particle dispersion stabilizer is a active hydrogen-containing compound.

### Claim 10 (depends on 9)

The process according to claim 9, wherein the active hydrogen-containing compound has a bond formed by the reaction of an active hydrogen-containing group with an isocyanate group.

### Claim 11 (depends on 10)

The process according to claim 10, wherein the bond formed by the reaction with the isocyanate group is a urethane bond or a urea bond.

### Claim 12 (depends on 9)

The process according to claim 9, wherein the active hydrogen-containing compound is an active hydrogen-containing compound containing fine particles of polyurea, polyurethane or polyurethaneurea formed by the reaction of an active hydrogen-containing group with an isocyanate group.

### Claim 13 (depends on 9)

The process according to claim 9, wherein the active hydrogen-containing compound is a polyether polyol having a hydroxyl value of not higher than 28.