Process for the stabilization of polyacetal reins

Abstract

Process for the stabilization of polyacetal resins having terminal hydroxyl groups, which comprises reacting a reagent capable of etherifying the hydroxyl groups with the polyacetal resins suspended in a reaction medium that is liquid under the conditions used, the said reaction medium consisting of at least one substance that is a solvent for the polymer and at least one substance that is a non-solvent for the polymer, the said solvent and non-solvent substances being completely miscible at the reaction temperatures but immiscible or partly miscible at temperature substantially lower than the reaction temperatures, and carrying out the operation in the presence of catalytic quantities of one or more compounds selected from the groups consisting of A. strong or medium-strong mineral acids whose acid dissociation constant or first acid dissociation constant is higher than 10.sup..sup.-7 ; B. strong or medium-strong oganic acids whose acid dissociation constant is higher than 10.sup..sup.-6 ; C. alkyl, cycloalkyl, or alkylaromatic esters of strong or medium-strong mineral acids; D. alkyl, cycloalkyl or alkylaromatic esters of strong or medium-strong organic acids.

Dependencies are inferred from the claim text.