Shape memory film

Details Shape memory film Shape memory film

1989-10-12

1992-08-18

Sluby, P. C.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

4284231, 428913, 264230, 528 44, B32B 2700, B29C 4100

Patent

active

051398320

ABSTRACT:
A shape memory film formed from a shape memory transparent polymer, said shape memory film being capable of remembering a basic shape such as plane configuration and dead folds, taking on a second shape when the basic shape is modified (by changing the plane configuration and adding dead folds, twists, three-dimensional configurations, etc.) at a temperature higher than the glass transition point of the polymer and lower than the molding temperature of the polymer, and having the second shape set when cooled to a temperature lower than the glass transition point while being kept in the second shape; and a method of using said shape memory film by setting the second shape and subsequently heating the film to a temperature higher than the glass transition point, thereby causing the film to restore its basic shape.

REFERENCES:
patent: 2468731 (1949-05-01), Borkland
patent: 3562973 (1971-02-01), Arditti et al.
"Development of Polymeric Elasticity Memory Material", Mitsubishi Juko GIHO vol. 25, No. 3 (1988) pp. 236-240).

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