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US 6,720,402 B2Granted
Shape memory polymers
AssigneeMnemoscience GmbH
InventorsRobert S. Langer, Andreas Lendlein
Life of this patent
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AssigneeMnemoscience GmbH
InventorsRobert S. Langer, Andreas Lendlein
Estimating the term…
Shape memory polymer compositions, articles of manufacture thereof, and methods of preparation and use thereof are described. The shape memory polymer compositions can hold more than one shape in memory. Suitable compositions include at least one hard segment and at least one soft segment. At least one of the hard or soft segments can contain a crosslinkable group, and the segments can be linked by formation of an interpenetrating network or a semi-interpenetrating network, or by physical interactions of the blocks. Objects can be formed into a given shape at a temperature above the Ttrans of the hard segment, and cooled to a temperature below to Ttrans of the soft segment. If the object is subsequently formed into a second shape, the object can return to its original shape by heating the object above the Ttrans of the soft segment and below the Ttrans of the hard segment.
A method of using a shape memory polymer composition having at least two shapes in memory to form an article.
A method of using a shape memory polymer composition wherein the composition comprises:
A method of using a shape memory polymer composition wherein the composition comprises at least a hard segment and a soft segment wherein at least one of the bard and soft segments undergoing solid to solid state transitions, and/or ionic interactions involving polyelectrolyte segments or supramolecular effects based on highly organized hydrogen bonds to form an article.
Dependencies are inferred from the claim text.