METHOD OF PREPARING THERMOPLASTIC COMPOSITIONS BASED ON PLASTICISED STARCH AND RESULTING COMPOSITIONS Russian patent published in 2014 - IPC C08L3/02 C08L75/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a starch-based thermoplastic composition which includes the following steps: (a) selection of at least one granular starch (component 1) and at least one organic plasticiser (component 2) of said starch; (b) preparation of a plasticised composition by thermo-mechanical mixing of said starch and said organic plasticiser; (c) optional incorporation, into the plasticised composition obtained in step (b), of at least one functional substance (optional component 4), other than granular starch, bearing functional groups having an active hydrogen and/or functional groups which give, via hydrolysis, such functional groups having an active hydrogen; and (d) incorporation, into the plasticised composition obtained, of at least one coupling agent (component 3) having a molecular weight of less than 5000, chosen from organic diacids and compounds bearing at least two identical or different, free or masked functional groups chosen from isocyanate, carbamoylcaprolactam, epoxide, halogen, acid anhydride, acyl halide, oxychloride, trimetaphosphate and alkoxysilane functional groups, wherein said granular starch is native starch, and said plasticiser is chosen from diols, triols and polyols. The invention also relates to starch-based thermoplastic compositions for use in plastic processing, which can be obtained using said method.

EFFECT: use of the invention improves mechanical properties and water resistance of the compositions.

19 cl, 7 tbl