# US 4,391,770 A · Process for spinning amino-formaldehyde fibers

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- Number: US 4,391,770 A
- Document ID: US4391770A
- Status: Granted
- Kind: A
- Application number: 06/322,291
- Filed: 1981-11-17
- Granted: 1983-07-05
- Earliest claimed: 1980-12-01
- Assignees: Imperial Chemical Industries PLC
- Inventors: Graham E. Martin
- Web page: https://patentgrep.com/patent/US4391770A

## CPC

- C08L 61/20: Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen (with aminophenols C08L61/04)
- C08K 3/28: Nitrogen-containing compounds
- C08K 5/098: Metal salts of carboxylic acids
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Shaped articles of amino-formaldehyde resins having reduced released formaldehyde emission are made using a curing catalyst mixture of a volatile acid (or salt thereof) and a small amount of a non-volatile acid (or salt thereof).

## Claims

### Claim 1

A process for the production of fibers from amino-formaldehyde resins in which the fibers are formed from a solution of the resin and cured by heating to a temperature between 100.degree. C. and 300.degree. C., characterised in that the resin solution contains a catalyst mixture comprising 0.2 to 5% by weight, based on the resin solids, of ammonium formate and from 10 to 50% by weight, based on the weight of the ammonium formate, of a salt of a non-volatile acid selected from
(i) an ammonium salt of an acid selected from sulphuric, phosphoric, and nitric acids, and
(ii) a water soluble salt of a metal selected from zinc, magnesium, calcium, and aluminum and an acid selected from nitric, sulphuric, and phosphoric acids.

### Claim 2 (depends on 1)

A process according to claim 1 wherein the amount of said ammonium formate is less than 2% by weight, based on the resin solids.

### Claim 3 (depends on 1, 2)

A process according to claim 1 or claim 2 wherein the amount of said salt of the non-volatile acid is at least 0.2% by weight of the resin solids.

### Claim 4 (depends on 1)

A process according to claim 1 wherein said amino-formaldenhyde resin solution containing the catalysts is obtained by mixing a solution containing the amino-formaldehyde resin with a solution containing at least one of said catalysts and a water soluble thermoplastic polymer selected from polyvinyl alcohol and polyethylene oxide.

### Claim 5 (depends on 4)

A process according to claim 4 wherein the salt of the non-volatile acid is a water soluble metal salt and is incorporated into the solution of the amino-formaldehyde resin prior to mixing the latter with the solution of the ammonium formate and water soluble polymer.

### Claim 6 (depends on 1)

A process according to claim 1 wherein the amino-formaldehyde resin is cured by heating to temperatures in the range of 130.degree. to 220.degree. C.

### Claim 7 (depends on 1)

A process according to claim 1 wherein the salt of the non-volatile acid is zinc nitrate.

### Claim 8 (depends on 1)

A process according to claim 1 wherein the salt of the non-volatile acid is ammonium nitrate.