A method for producing a polyoxymethylene polyoxyalkylene copolymer, comprising reacting a polymer formaldehyde compound with an alkylene oxide in the presence of a double metal cyanide (DMC) catalyst, wherein the polymer formaldehyde compound comprises at least one terminal hydroxyl group and wherein the method comprises the steps of placing a suspending agent in a reactor and subsequently incrementally or continuously metering in the polymer formaldehyde compound into the reactor during the reaction is provided.

A method for producing a polyoxymethylene polyoxyalkylene copolymer, comprising reacting a polymer formaldehyde compound with an alkylene oxide in the presence of a double metal cyanide (DMC) catalyst, wherein the polymer formaldehyde compound comprises at least one terminal hydroxyl group and wherein the method comprises the steps of placing a suspending agent in a reactor and subsequently incrementally or continuously metering in the polymer formaldehyde compound into the reactor during the reaction is provided.

The present disclosure is directed to a process for producing a polyoxymethylene polymer or paraformaldehyde in an environmentally friendly and sustainable manner. The polyoxymethylene polymer or paraformaldehyde can be produced so as to be carbon neutral or even carbon negative. In one aspect, the polyoxymethylene polymer or paraformaldehyde is formed from a biogas or from a recycled gas. The biogas and the recycled gas are used to produce the components needed to form the polymer.

The present disclosure is directed to a process for producing a polyoxymethylene polymer or paraformaldehyde in an environmentally friendly and sustainable manner. The polyoxymethylene polymer or paraformaldehyde can be produced so as to be carbon neutral or even carbon negative. In one aspect, the polyoxymethylene polymer or paraformaldehyde is formed from a biogas or from a recycled gas. The biogas and the recycled gas are used to produce the components needed to form the polymer.

A process for forming stabilizing paraformaldehyde can include heating a formaldehyde solution comprising 30 wt % or more formaldehyde to a temperature ranging from about 70° C. to about 130° C.; aging the formaldehyde solution for a sufficient amount of time to polymerize the formaldehyde and form paraformaldehyde; solidifying the paraformaldehyde; and contacting the formaldehyde solution before and/or during heating, the formaldehyde solution during aging, the paraformaldehyde, and/or the solidified paraformaldehyde with an ammonia and/or ammonia hydroxide stabilizer.

A process for forming stabilizing paraformaldehyde can include heating a formaldehyde solution comprising 30 wt % or more formaldehyde to a temperature ranging from about 70° C. to about 130° C.; aging the formaldehyde solution for a sufficient amount of time to polymerize the formaldehyde and form paraformaldehyde; solidifying the paraformaldehyde; and contacting the formaldehyde solution before and/or during heating, the formaldehyde solution during aging, the paraformaldehyde, and/or the solidified paraformaldehyde with an ammonia and/or ammonia hydroxide stabilizer.

The patent application relates to a process for preparing polyoxymethylene by polymerization of a reaction mixture (R.sub.G) which comprises at least one formaldehyde source and at least one initiator mixture (I.sub.G), wherein the initiator mixture (I.sub.G) comprises at least one polymerization initiator and at least one solvent of the general formula (I)
R.sup.1—O—[—R.sup.3—O—].sub.m—R.sup.2  (I), where m is 1, 2, 3 or 4; R.sup.1 and R.sup.2 are each, independently of one another, C.sub.3-C.sub.6-alkyl; R.sup.3 is C.sub.1-C.sub.5-alkylene.

The patent application relates to a process for preparing polyoxymethylene by polymerization of a reaction mixture (R.sub.G) which comprises at least one formaldehyde source and at least one initiator mixture (I.sub.G), wherein the initiator mixture (I.sub.G) comprises at least one polymerization initiator and at least one solvent of the general formula (I)
R.sup.1—O—[—R.sup.3—O—].sub.m—R.sup.2  (I), where m is 1, 2, 3 or 4; R.sup.1 and R.sup.2 are each, independently of one another, C.sub.3-C.sub.6-alkyl; R.sup.3 is C.sub.1-C.sub.5-alkylene.

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.

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.