Title:
SHAPE MEMORY POLYMERS
Document Type and Number:
WIPO Patent Application WO1999042528
Kind Code:
A3
Abstract:
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 DEG C. At least one of the hard or soft segments can contain a cross-linkable 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.
Inventors:
LANGER ROBERT S (US)
LENDLEIN ANDREAS
LENDLEIN ANDREAS
Application Number:
PCT/US1999/003923
Publication Date:
November 04, 1999
Filing Date:
February 23, 1999
Export Citation:
Assignee:
MNEMOSCIENCE GMBH (DE)
LANGER ROBERT S (US)
LANGER ROBERT S (US)
International Classes:
B29C61/00; C08F299/04; A61L27/00; C08G81/00; C08L101/00; C08L101/16; (IPC1-7): C08L101/00; B29C61/00
Foreign References:
| EP0422693A2 | 1991-04-17 | |||
| EP0385443A2 | 1990-09-05 | |||
| EP0374961A2 | 1990-06-27 |
Other References:
LI YONG ET AL: "Shape Memory Gels Made by the Modulated Gel Technology", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 63, no. 9, 28 February 1997 (1997-02-28), New York, USA, pages 1173 - 1178, XP002111074
HU ZHIBING ET AL: "Sythesis and Application of Modulated Polymer Gels", SCIENCE, vol. 269, no. 5223, 28 July 1995 (1995-07-28), Washington, USA, pages 525 - 527, XP002111075
PATENT ABSTRACTS OF JAPAN vol. 015, no. 227 (C - 0839) 10 June 1991 (1991-06-10)
HU ZHIBING ET AL: "Sythesis and Application of Modulated Polymer Gels", SCIENCE, vol. 269, no. 5223, 28 July 1995 (1995-07-28), Washington, USA, pages 525 - 527, XP002111075
PATENT ABSTRACTS OF JAPAN vol. 015, no. 227 (C - 0839) 10 June 1991 (1991-06-10)
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