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Specific examples of the urea-modified polyester resins include (1) a mixture of a urea-modified polyester prepolymer with isophoronediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid, (2) a mixture of a urea-modified polyester prepolymer with isophoronediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and a terephthalic acid, (3) a mixture of a urea-modified polyester prepolymer with isophoronediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and an terephthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and a terephthalic acid, (4) a mixture of a urea-modified polyester prepolymer with isophoronediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and an terephthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of propyleneoxide and a terephthalic acid, (5) a mixture of aurea-modified polyester prepolymer with hexamethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an terephthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and a terephthalic acid, (6) a mixture of a urea-modified polyester prepolymer with hexamethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an terephthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and a terephthalic acid, (7) a mixture of a urea-modified polyester prepolymer with ethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an terephthalic acid with isophoronediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and a terephthalic acid, (8) a mixture of a urea-modified polyester prepolymer with hexamethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid with diphenylmethanediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid, (9) a mixture of a urea-modified polyester prepolymer with hexamethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and an terephthalic acid/dodecenylsuccinic acid anhydride with diphenylmethanediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide/an adduct of bisphenol A with 2 moles of propyleneoxide and a terephthalic acid, and (10) a mixture of a urea-modified polyester prepolymer with hexamethylenediamine, which is formed from a reacting a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid with toluenediisocyanate; and a polycondensate of an adduct of bisphenol A with 2 moles of ethyleneoxide and an isophthalic acid.