Oxymethylene copolymers and process for their preparation
AssigneeSolvay & Cie (Societe Anonyme)
InventorsAndre Collart, Fredy Declerck
Life of this patent
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Abstract
Copolymers containing oxymethylene and 2-fluoromethoxyethylene repeat units. These copolymers, of improved heat stability, may be prepared by copolymerizing trioxane with a derivative of a cyclic ether whose molecule contains at least two adjacent carbon atoms and in which an oxymethylene group carries a fluoromethyl substituent, especially epifluorohydrin.
Claims20
Copolymers containing oxymethylene repeating units having the formula ##STR2## and 2-fluoromethoxyethylene repeating units having the formula ##STR3##
Process for the preparation of copolymers containing oxymethylene repeating units having the formula ##STR4## and 2-fluoromethoxyethylene repeating units having the formula ##STR5## characterized in that trioxane is copolymerized with at least one comonomer chosen from derivatives of cyclic ethers whose molecule contains at least two adjacent carbon atoms and in which an oxymethylene group carries a fluoromethyl substituent.
A copolymer containing oxymethylene repeating units having the formula ##STR6## and 2-fluoromethoxyethylene repeating units having the formula ##STR7## and prepared by a process comprising:
- providing trioxane as the source of the oxymethylene repeating units and at least one comonomer as the source of the 2-fluoromethoxyethylene repeating units and chosen from derivatives of cyclic ethers whose molecule contains at least two adjacent carbon atoms and in which an oxymethylene group carries a fluoromethyl substituent;
- mixing the trioxane and the at least one comonomer under conditions of temperature and pressure effective to cause copolymerization thereof;
- and
- recovering the copolymer.
Dependencies are inferred from the claim text.