CPC C08G 2/10 (2013.01) [B01J 27/12 (2013.01); C08G 2/06 (2013.01)] | 9 Claims |
1. A process for making an oxymethylene polymer comprising polymerizing at least one compound capable of forming —CH2O— repeat units (monomer) and at least one comonomer which is a cyclic ether or cyclic formal in the presence of at least one ester of the formula I (ester)
R1—CO—O—R2 (I)
wherein
R1 can be hydrogen, with the proviso that R2 is C2 alkyl or linear C3 to C4 alkyl,
wherein R1 and R2 are independently of each other
linear or branched C1 to C4 alkyl
and in the presence of at least one Lewis acid, wherein the Lewis acid is an halogenide of boron, tin, titanium, phosphorus, antimony or arsenic, wherein the at least one Lewis acid is premixed with the at least one ester (premixture) and the weight ratio of the at least one ester to the at least one Lewis acid being of from 10:1 to 300:1.
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