Patent ID: 7150960

Claim:
A developer composition comprising: (a) 0.1 to 10 parts by weight of alkali metal carbonate salt, the amount of said alkali metal carbonate salt is calculated by comparing with 100 parts by weight of water; (b) 0.1 to 10 parts by weight of alkali metal bicarbonate salt, the amount of said alkali metal bicarbonate salt is calculated by comparing with 100 parts by weight of water; (c) 0.1 to 20 parts by weight of nonionic surfactant of the formula (I) below: wherein R 1 is hydrogen or methyl; R 2 is hydrogen or methyl; n is an integer of 0 to 10; m is an integer of 4 to 20; the amount of said nonionic surfactant of the formula (I) is calculated by comparing with 100 parts by weight of water; and (d) 0.1 to 20 parts by weight of nonionic surfactant of the formula (II) below: wherein R 3 is C 1 –C 12 alkyl; p is an integer of 0 to 10; q is an integer of 4 to 20; the amount of said nonionic surfactant of the formula (II) is calculated by comparing with 100 parts or water.