SHRINKING MATERIALS FROM THERMOPLASTIC POLYURETHANES Russian patent published in 2020 - IPC C08G18/48 C08G18/66 C08G18/76 

FIELD: moulding.

SUBSTANCE: present invention relates to a method of producing a molded article (FK), thermoplastic polyurethane, a molded article and use of thermoplastic polyurethane to produce a molded article. Said method involves producing thermoplastic polyurethane, obtaining a molded article (FK*) from thermoplastic polyurethane, heating molded article (FK*) to temperature below temperature, at which constant deformability of molded article (FK*) is realized, but above temperature of actuation of thermoplastic polyurethane, stretching heated molded article (FK*) to produce molded article (FK) and cooling molded article (FK) to temperature lower than that of thermoplastic polyurethane. Obtaining thermoplastic polyurethane involves reacting at least one polyisocyanate composition, at least one chain extension agent and at least one polyol composition. Polyol composition contains at least one polyol (P1) having at least one aromatic polyester unit (B1). Aromatic polyester unit (B1) is a polyethylene terephthalate block. Polyisocyanate is an aromatic diisocyanate.

EFFECT: invention enables to obtain molded articles with shape memory effect in the temperature range from 0 °C to 130 °C, which come into contact with food products.

15 cl, 3 tbl, 4 ex