OBTAINING AND APPLYING NEW THERMOPLASTIC POLYURETHANE ELASTOMERS ON BASIS OF SIMPLE POLYEFIRCARBONATPOLIOLS Russian patent published in 2018 - IPC C08G18/10 C08G18/12 C08G18/44 C08G18/66 C08G18/32 

FIELD: technological processes.

SUBSTANCE: method includes a first step in which at least one organic diisocyanate A) and at least one polyol B) with a number average molecular weight M_n≥500 and ≤5000 g/mol react with each other to form an isocyanate-terminated prepolymer. In a second step, the prepolymer is reacted with one or more chain extension agents C) of molecular weight ≥60 and ≤490 g/mol and optionally with a monofunctional chain breaker D) or an organic diisocyanate E). Where necessary, at least one catalyst F) is used in the first and/or second step. The reaction of the components is carried out in a reaction extruder or in a tape process with a mixing head. Molar ratio between the sum of isocyanate groups of A)) and, if necessary, E) and the sum of capable of reacting with isocyanate groups B), C) and if necessary D) is ≥0.9:1 and ≤1.2:1. Component B) contains at least one simple polyester carbon polyol that is received by attaching carbon dioxide and alkylene oxides to H-functional substances-initiators. The content of carbonate groups of simple polyester carbon polyol is ≥3 and ≤35 wt %. The number-average molecular weight of the polyester carbon polyol is ≥500 and ≤10000 g/mol and the average functionality for OH is 1.85 to ≤2.5.

EFFECT: received thermoplastic polyurethane elastomers have good mechanical properties, in particular high tensile strength, low abrasion and superior thermal resistance.

13 cl, 4 tbl, 21 ex