Process for the preparation of acetal polymers
AssigneeTicona LLC
InventorsMichael Haubs, Stanislaw Penczek
Life of this patent
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Abstract
The present invention relates to a process for the preparation of acetal polymers, in particular of polyoxymethylene (POM) by cationic polymerization where organophosphonic and/or organophosphinic acids and/or their derivatives and/or their precursors are used as the initiator.
Claims21
A process for the formation of acetal homopolymers or copolymers by cationic polymerization of monomers characterized in that organophosphonic acid, and/or organophosphonic acid and/or their derivatives, and/or their precursors are used as the polymerisation initiator and
- wherein organophosphonic acid and its derivatives have a structure according to the general formula (I), and organophosphonic acid and its derivatives have a structure according to the general formula II,
- where R1 and R2 are CF3—(CF2)n—, with n=0–10,
- R3 and R4 are H, an alkyl group or an aryl group and
- X is O, NH or NR, with R representing an alkyl group or an aryl group.
A process for the cationic polymerization or copolymerisation of monomers which comprises polymerizing using an initiator which is
- (1) an organophosphonic acid and its derivative and its precursor of the general formula (I)
- where R1 and R2 are CF3—(CF2)n—, with n=0–10,
- R3 and R4 are H, an alkyl group or an aryl group and
- X is O, NH or NR, with R representing an alkyl group or an aryl group
- or
- (2) an organophosphonic acid and its derivative and its precursor of the general formula (II)
- where R1 is CF3—(CF2)n—, with n=0–10,
- R3 and R4 are H, an alkyl group or an aryl group and
- X is O, NB or NR, with the R representing an alkyl group or an aryl group.
Dependencies are inferred from the claim text.