Polyoxymethylene copolymers, their preparation and use
AssigneeTicona LLC
InventorsKarl-Friedrich Mück, Klaus Kurz, Michael Hoffmockel
Life of this patent
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Abstract
Copolymers are described containing blocks of the structural repeat units of the formula I and blocks containing structural units of the formula II [—O—CH2—]x, (I) [—O—R1—], (II) where R1 is a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which, where appropriate, has ether groups and/or carbonyloxy groups in the chain, and x is a whole number, at least 10. The copolymers may be used for producing moldings.
Claims15
A process for preparing a copolymer containing 70 to 99% by weight based on the copolymer of polyoxymethylene blocks of the structural repeat units of the formula I and from 1 to 30% by weight blocks containing structural units of the formula II
- [—O—CH2—]x (I),
- [—O—R1—] (II),
- where R1 is a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which optionally has ether groups and/or carbonyloxy groups in the chain, and
- x is a whole number, at least 10 encompassing the following measures:
- (i) forming an initial charge from monomers which form —O—CH2— units together with monomers of the formula V
- HO—R1—OH (V),
- where R1 is as defined above, together with a catalyst usually used for polymerizing the monomers forming the —O—CH2— units, and optionally together with a solvent, and/or with regulators, and
- (ii) carrying out the copolymerization at a temperature of from 120 to 300° C. and at a pressure of from 2 to 500 bar.
Dependencies are inferred from the claim text.