Patent ID: 7858074

Claim:
A rheological additive in the form of a preactivated paste, wherein it consists of: A) at least one fatty acid diamide in a powder form, said powder optionally comprising in addition to said diamide, hydrogenated castor oil, the weight of said fatty acid diamide varying from 10 to 40%, with respect to the mixture A)+B) and said fatty acid diamide being obtained by polycondensation between at least one C 2 to C 12 primary diamine and at least one monocarboxylic acid with a chain length of C 3 to C 22 , the reaction product optionally being diluted in hydrogenated castor oil to a level from 10 to 100% by weight based on the diamide +hydrogenated castor oil total weight; and B) at least one organic plasticizer, said plasticizer being liquid at room temperature and being a polar organic plasticizer bearing at least one of an ether group, ester group, epoxy group or a combination thereof; wherein the dynamic elastic modulus G′ of said rheological additive in the form of a preactivated paste, measured on the mixture A)+B), at a temperature of 23° C. and under a frequency of 1 Hz, is greater than or equal to 10 4 Pa, and the maximum penetration value of the final preactivated paste is less than 15 mm, measured according to standard ASTM D 217.