COMPOSITION FOR PREPARING SOFT POLYURETHANE MATERIALS Russian patent published in 2006 - IPC C08L75/06 C08G18/34 C08G18/32 C08G18/65 

FIELD: chemistry of polymers.

SUBSTANCE: invention relates to formulations of polyurethane elastoplastics designating for preparing soft polyurethane materials with Shore hardness value 45-55 conditional units. Invention describes the composition comprising 74.8-78.4 wt.-% of urethane pre-polymer based on 1.8 mole of 2,4-toluylene diisocyanate and 1.0 mole of polyethylenebutylene glycoladipinate of molecular mass 2000 Da and liquid hardening agent based on aromatic amine 3,3'-dichloro-4,4'-diaminodiphenylmethane and a mixture of oligoesters - polyethylene glycoladipinate of molecular mass 800 Da and polyethylenebutylene glycoladipinate of molecular mass 2000 Da taken in the mole ratio 0.34; 0.33; 0.33 (up to 100 wt.-%). Polyurethane materials prepared on the basis of such composition show Shore hardness value at the level 45 units, rupture strength limit (at 23°C) at the level 31.2 MPa, relative elongation at rupture 1100%, and they can be exploited at temperature -10°C.

EFFECT: improved and valuable properties of composition.

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