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US 6,388,043 B1Granted
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. The Ttrans of the hard segment is preferably between −30 and 270° C. 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 the 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. The compositions can also include two soft segments which are linked via functional groups which are cleaved in response to application of light, electric field, magnetic field or ultrasound. The cleavage of these groups causes the object to return to its original shape.
A shape memory polymer composition having at least two shapes in memory.
A shape memory polymer composition comprising:
A shape memory polymer composition comprising hard and soft segments wherein at least one of the hard and soft segments undergoing solid to solid state transitions wherein the polymer has two or more shapes in memory.
A shape memory polymer composition wherein the polymer has a physical crosslink on the basis of ionic interactions involving polyelectrolyte segments or supramolecular effects based on highly organized hydrogen bonds and wherein the polymer has two or more shapes in memory.
A method for forming a shape memory article with two or more shapes in memory comprising:
A method of forming a composition with a shape in memory comprising:
Dependencies are inferred from the claim text.