Patent ID: 8853354

Claim:
A polyion complex (PIC) comprising a hydrophobized poly(acidic amino acid) and a basic polypeptide, wherein the hydrophobized poly(acidic amino acid) is comprised of a unit (A) represented by a general formula (I): and a unit (B) represented by a general formula (II): wherein, R 1 is a non-substituted or substituted phenyl or indolyl group, R 2 is a linear or branched alkyl, alkenyl or alkynyl group having a carbon atom number of 1 to 5; 1 is an integer of 1 or 2; the sum of m and n is 40 to 40,000, and wherein a molar ratio of the unit (A) and the unit (B) ((m):(n)) is 10:90 to 90:10.