The invention relates to a rheology additive, according to which:A) said additive consists of:a)at least one symmetrical fatty diamide of formula (I) below:(AGH)-CONH-(PMDA)-NHCO-(AGH) (I)with:- (AGH): hydroxylated fatty acid residue R1CO2H, without -CO2H group, with R1of C18to C20comprising a hydroxyl group,- NHCO- or -CONH-: amide group- (PMDA): residue without amine groups of 1,5-pentamethylenediamine, preferably of the diamine cadaverine which is the biobased diamine 1,5-pentamethylenediamineor alternatively according to which:B) said additive comprises:a) at least one symmetrical fatty diamide as defined above according to formula (I)and, in addition,b)at least one other symmetrical fatty diamide of formula (II) below:(AGH)-CONH-(R)-NHCO-(AGH) (II)with (AGH), -NHCO- and -CONH- having the same definition as that above in said formula (I) and(R) being the residue without amine groups of a diamine, other than (PMDA), chosen from a cycloaliphatic, aliphatic or aromatic diamine.It also relates to binder compositions comprising said additive for applications in coatings, adhesive-bonding agents or adhesives, moulding compositions, mastics or leaktightness agents or cosmetics, and to a finished product which results therefrom.本發明有關一流變添加劑， 根據該者A) 所述添加劑由下者所組成：a) 至少一種下式(I)的對稱脂肪二醯胺：(AGH)-CONH-(PMDA)-NHCO-(AGH) (I)其中：- (AGH)：羥基化脂肪酸R1CO2H之不具有CO2H基的殘基，其中C18至C20的R1包含一羥基，- NHCO-或-CONH-：醯胺基- (PMDA)：不具有胺基的1,5-戊二胺之殘基，較佳地為二胺屍胺(cadaverine)的殘基，其中屍胺係生物基底的二胺1,5-戊二胺，或者根據下者：B) 所述添加劑包含：a) 至少一種如上文界定根據式(I)的對稱脂肪二醯胺且此外，b) 至少另一種下式(II)的對稱脂肪二醯胺：(AGH)-CONH-(R)-NHCO-(AGH) (II)其中(AGH)、-NHCO-和-CONH-具有如上文該式(I)中之定義相同的定義，並且(R)是除(PMDA)之外，選自於脂環族、脂族或芳族二胺的不具胺基的二胺殘基。本發明亦有關包含所述添加劑的黏合劑組成物，用於塗料、膠合劑或黏著劑、模塑組成物、膠泥或防漏劑或化妝品應用中，並有關由此得到的成品。
