초록 ▼

Formaldehyde-free resins of the formula (I): [Figure] (I) where n is an integer greater than or equal to 2, the phenolic units of the resin are directly bonded to one another through positions ortho or para to the hydroxyl group, Y is present at a position meta or para to the hydroxy group and is se

Formaldehyde-free resins of the formula (I): [Figure] (I) where n is an integer greater than or equal to 2, the phenolic units of the resin are directly bonded to one another through positions ortho or para to the hydroxyl group, Y is present at a position meta or para to the hydroxy group and is selected from the group consisting of an alkyl group, a halogen atom, an aryl group, a phenylalkyl group, an allyl group, a carboxyl group of the formula －COOR, where R is a hydrogen atom, an alkyl group or a phenylalkyl group, an amino group of the formula －NR1R2 where R1 and R2 are the same or different and represent a hydrogen atom or an alkyl group, and Z is a hydrogen atom, an alkyl group, a halogen atom, an aryl group, a phenylalkyl group, or a －COOR group, or Z in conjunction with the adjacent meta position forms a condensed benzene ring; or a metal-modified, formaldehyde-free phenolic developer resin obtained by reacting said developer resin with a metal salt; the resins are useful as developers in forming colored images by reaction with substantially colorless electron-donating compounds.

대표청구항 ▼

A developer sheet comprising a support having a color developer on one surface thereof, said developer being capable of reacting with an electron-donating color precursor and producing a visible image and being formaldehyde-free phenolic developer resin represented by the formula (I): [Figure] (I) w

A developer sheet comprising a support having a color developer on one surface thereof, said developer being capable of reacting with an electron-donating color precursor and producing a visible image and being formaldehyde-free phenolic developer resin represented by the formula (I): [Figure] (I) where n is greater than or equal to 2, the phenolic units of the resin are directly bonded to one another through positions ortho or para to the hydroxyl group, Y is present at a position meta or para to the hydroxy group and is selected from the group consisting of an alkyl group, a halogen atom, an aryl group, a phenylalkyl group, an allyl group, a group of the formula －COOR, where R is a hydrogen atom a phenylalkyl group or an alkyl group, an amino group of the formula －NR1R2 where R1 and R2 are the same or different and represent a hydrogen atom or an alkyl group, and Z is a hydrogen atom, an alkyl group, a phenylalkyl group, a halogen atom, an aryl group, or a －COOR group, or Z in conjunction with the adjacent meta position forms a condensed benzene ring; or a metal-modified, formaldehyde-free phenolic developer resin obtained by reacting said developer resin with a metal salt.