Shape memory hollow body and method of working the same

Details Shape memory hollow body and method of working the same Shape memory hollow body and method of working the same

C - Chemistry, Metallurgy

08

G

402/147, 18/978

C08G 18/28 (2006.01) B29C 61/00 (2006.01) B29C 65/66 (2006.01) C08G 18/10 (2006.01) C08G 18/32 (2006.01) C08G 18/72 (2006.01) B29C 63/00 (2006.01)

Patent

CA 2000201

A shape memory hollow body which is molded from a polyurethane elastomer produced by prepolymer process from a raw material composed of a difunctional diisocyanate, difunctional polyol, and difunctional chain extender containing active hydrogen in a molar ratio of 2.00-1.10 : 1.00 : 1.00-0.10, said polyurethane elastomer containing NCO groups and OH groups in almost equal amounts at the terminals of the polymer chains and having a glass transition point in the range of -50 to 60°C and a crystallinity of 3 to 50 wt%, said hollow body remembering its as- molded basic shape but taking on a deformed shape which is given when it is deformed at a temperature higher than the glass transition point of the polymer and lower than the molding temperature and then set when it is cooled in the deformed state to a temperature lower than the glass transition point. A method of working the above-mentioned shape memory hollow body remembering its basic shape, said method comprising the steps of deforming the hollow body at a temperature higher than the glass transition point and lower than the molding temperature and then cooling it in the deformed state to a temperature lower than the glass transition point, thereby setting it in the deformed state, combining the deformed hollow body with another member, and heating the combination to a temperature higher than the glass transition point, thereby causing it to restore its basic shape and achieving firm bonding of the hollow body to the member.

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