Polyester prepolymer showing shape-memory effect

Details Polyester prepolymer showing shape-memory effect Polyester prepolymer showing shape-memory effect

1994-09-07

1995-08-15

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 5282953, 528297, 528301, 528306, 528307, 528308, 5283086, C08G 6366

Patent

active

054420377

ABSTRACT:
A shape-memory polyester prepolymer is prepared with at least one kind of dicarboxylic acid component and at least one kind of diol, triol or polyol component in such a way to have unsaturated end group, wherein the dicarboxylic acid component comprises aromatic dicarboxylic acid in an amount of not less than 80% by mole based on the total mole of the dicarboxylic acid component; the diol component comprises a diol containing 2-10 carbon atoms in an amount of not less than 80% by mole based on the total mole of the diol component; a repeating unit of the ester bond ranging in number from 2 to 50; and the end group has crosslinkable, ethylenically unsaturated bond. The prepolymer shows particularly excellent heat resistance and excellent chemical resistance and also exhibits excellent transparency. The prepolymer can be used in a variety of reversible or irreversible purposes, such as pipe coupling, external laminate of pipe, protection ring, O-ring, gap stopper, orthodontic wire, artificial muscles and the like.

REFERENCES:
patent: 3997627 (1976-12-01), Ichimura et al.
patent: 4520161 (1985-05-01), Sassano
patent: 4959451 (1990-09-01), Uchida et al.
patent: 5178951 (1993-01-01), Kono et al.

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