Abstract

A process for producing polyoxymethylene polymers comprises the reaction of aqueous formaldehyde solution with an aqueous solution of a base, wherein A) a starter solution comprising formaldehyde is initially charged and B) an aqueous formaldehyde solution and a base are added to the starter solution to obtain a reaction mixture. The starter solution in step A) has a temperature of ≥ 40°C to ≤ 46°C and the additions of the solutions in step B) are performed at a temperature of the reaction mixture of ≥ 40°C to ≤ 46°C. The base is an alkali metal hydroxide and/or an alkaline earth metal hydroxide and the molar ratio of formaldehyde to base is ≥ 55:1 to ≤ 90:1 based on the total amounts of formaldehyde and base employed in the process. The base in step B) is added in aqueous solution.

IPC Classes  ?

• C08G 2/08 - Polymerisation of formaldehyde
• C08G 2/18 - Copolymerisation of aldehydes or ketones
• C08G 2/06 - Catalysts

Goods & Services

Chemicals used in industry, science and photography, as well as in agriculture, horticulture and forestry.

Goods & Services

Chemicals, namely, solvents, used in the adhesive, chemical, cosmetical, paper, petrochemical, pharmaceutical and paint industries

Goods & Services

PARAFORMALDEHYDE USED AS AN INTERMEDIATE IN MANUFACTURING, SOLD PRINCIPALLY TO THE PLASTICS, CHEMICAL, PHARMACEUTICAL, TEXTILE AND PAINT AND VARNISH INDUSTRIES

Goods & Services

Formaldéhydes et ses modifications oligomères et polymères comme produits chimiques pour l'industrie.