# US 5,345,001 A · Aqueous resol solutions and preparation thereof

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- Number: US 5,345,001 A
- Document ID: US5345001A
- Status: Granted
- Kind: A
- Application number: 08/110,574
- Filed: 1993-08-23
- Granted: 1994-09-06
- Earliest claimed: 1992-09-17
- Assignees: Rutgerswerke Aktiengesellschaft
- Inventors: Stephan Schroter; Achim Hansen; Arno Gardziella; Peter Adolphs
- Web page: https://patentgrep.com/patent/US5345001A

## CPC

- C09D 161/06: of aldehydes with phenols
- B24D 3/28: Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)}
- C08G 8/10: with phenol
- C08G 14/08: Ureas; Thioureas
- 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)
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

An aqueous resol solution produced by an alkaline condensation of a phenolic compound with an aldehyde in a molar ratio of 1:1.5 to 2.5 with an alkali metal content of 1 to 5.0% by weight of the reaction solution, neutralizing the solution after the end of condensation at least partially with an aromatic hydroxy carboxylic acid at a temperature not greater than 50.degree. C. and then concentrating the reaction mixture which is readily dilutable with water.

## Claims

### Claim 1

An aqueous resol solutions produced by an alkaline condensation of a phenolic compound with an aldehyde in a molar ratio of 1:1.5 to 2.5 with an alkali metal content of 1 to 5.0% by weight of the reaction solution, neutralizing the solution after the end of condensation at least partially with an aromatic hydroxy carboxylic acid at a temperature not greater than 50.degree. C. and then concentrating the reaction mixture.

### Claim 2 (depends on 1)

The process of claim 1 wherein phenol is condensed with formaldehyde.

### Claim 3 (depends on 1)

The process of claim 1 wherein the aromatic hydroxy carboxylic acid is salicylic acid.

### Claim 4 (depends on 1)

The process of claim 1 wherein the condensation product is modified with urea before neutralization.

### Claim 5 (depends on 1)

A process for the preparation of an aqueous resol solution of claim 1 comprising condensing an aqueous mixture of a phenol with an aldehyde in a molar ratio of 1:1.5 to 2.5 in the presence of 1 to 5% by weight of an alkali metal, neutralizing the condensation product at least partially with an aromatic hydroxy carboxylic acid at a temperature not greater than 50.degree. C. and concentrating the reaction mixture.

### Claim 6 (depends on 5)

The process of claim 5 wherein phenol and formaldehyde are condensed.

### Claim 7 (depends on 5)

The process of claim 5 wherein before neutralization urea is added to the condensation product which is held at 50.degree. to 60.degree. C. for 30 to 120 minutes.

### Claim 8 (depends on 5)

The process of claim 5 wherein the aromatic hydroxy carboxylic acid is salicylic acid.

### Claim 9 (depends on 5)

The process of claim 5 wherein 50 to 100% of the alkali metal is neutralized with the aromatic hydroxy carboxylic acid.

### Claim 10 (depends on 5)

The process of claim 5 wherein the neutralization is effected stepwise.

### Claim 11 (depends on 1)

A water-dilutable lacquer or varnish containing an aqueous resol solution of claim 1.

### Claim 12 (depends on 1)

A bonding resin for abradants on a substrate containing an aqueous resol solution of claim 1.