Process for preparing polyoxymethylene
AssigneeBASF SE
InventorsLaurence Pottie, Juergen Demeter, Marie-Claire Hermant
Life of this patent
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Abstract
The patent application relates to a process for preparing polyoxymethylene by polymerization of a reaction mixture (RG) which comprises at least one formaldehyde source and at least one initiator mixture (IG), wherein the initiator mixture (IG) comprises at least one polymerization initiator and at least one solvent of the general formula (I) R1—O—[—R3—O—]m—R2 (I), where m is 1, 2, 3 or 4; R1 and R2 are each, independently of one another, C3-C6-alkyl; R3 is C1-C5-alkylene.
Claims18
A process for preparing polyoxymethylene, comprising polymerizing a reaction mixture (RG) which comprises a formaldehyde source and an initiator mixture (IG), wherein the initiator mixture (IG) comprises a polymerization initiator and a solvent of formula (I):
- R1—O—[—R3—O—]m—R2 (I),
- wherein
- m is 1, 2, 3 or 4;
- R1 and R2 are each, independently of one another, C3-C6-alkyl;
- and
- R3 is ethylene.
A process for preparing polyoxymethylene, comprising polymerizing a reaction mixture (RG) which comprises a formaldehyde source and an initiator mixture (IG), wherein the initiator mixture (IG) comprises a polymerization initiator and a solvent of formula (I):
- R1—O—[—R3—O—]m—R2 (I),
- wherein
- m is 1, 2, 3 or 4;
- R1 and R2 are each, independently of one another, C3-C6-alkyl;
- and
- R3 is ethylene, and
- wherein a degree of solvent migration is less than 10 μg/kg.
Dependencies are inferred from the claim text.