Process for spinning amino-formaldehyde fibers
AssigneeImperial Chemical Industries PLC
InventorGraham E. Martin
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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).
Claims8
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.
Dependencies are inferred from the claim text.