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US 10,689,483 B2Granted
Process for preparing polyalkenamers for packaging applications
AssigneeEvonik Operations GmbH
InventorsRoland Wursche, Juergen Herwig
Life of this patent
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Abstract
The present invention relates to a process for producing cycloalkenamer-containing compositions and to such cycloalkenamer-containing compositions. The invention further relates to the use of these cycloalkenamer-containing compositions in the field of packaging materials, especially for food and drink.
Claims18
A process for producing a polyalkenamer-containing composition, comprising the steps of:
- a) converting at least one cycloalkene by ring-opening metathetic polymerization, in the presence of a chain transfer agent, to obtain a polyalkenamer-containing product-mixture,
- b) converting the product-mixture into solid form,
- c) granulating or pulverizing the product-mixture in solid form to particles prior to step d), and
- d) working up the product-mixture to remove the at least one cycloalkene monomer and/or an oligomer of the at least one cycloalkene to obtain the polyalkenamer-containing composition, wherein
- step d) is effected by extraction in a solvent mixture comprising at least one solvent 1 and at least one solvent 2, where the solubility parameter δ of the solvents 1 is not more than 20.07 MPa1/2 and the solubility parameter δ of the solvents 2 is at least 20.27 MPa1/2.
2 more elements
A polyalkenamer-containing composition containing at least 95% by weight of polyalkenamer, wherein
- less than 20,000 ppm of a monomer of a cycloalkane and/or an oligomer of a cycloalkene are present, based on the polyalkenamer-containing composition.
Dependencies are inferred from the claim text.