Printing fluid

Claim 2

A low-viscosity printing fluid as claimed in claim 2 which is free from tinetorial particulate matter and which has a viscosity of less than 15 cps at 77*F., a stability of from about 1 hour to in excess of 4 months, and a transference value of from about 0 to about 4 as measured against standardized solutions of a standard thermosetting resin and a standard dye.

Claim 3

A low-viscosity printing fluid as claimed in claim 3 which has a transference value of from 0 to 2.

Claim 4

A low-viscosity printing fluid as claimed in claim 1 wherein the resin is a water-soluble, cationic, thermosetting polyhydroxypolyalkylenepolyurea-formaldehyde resin condensate prepared by a process which comprises reacting between about 0* and 100*C., in the presence of an inert volatile solvent, epichlorohydrin and an alkylene polyamine having two to three carbon atoms in the alkylene portion thereof in a mole ratio of 1:1 to 1.4:1 yielding soluble reaction products, continuing this reaction until an aqueous solution of the resulting polyhydroxypolyalkylenepolyamine hydrochloride at a polyamine concentration of about 46% has a viscosity of J to Z7 at 25*C. on the Gardner-Holdt scale, neutralizing the hydrochloride portion thereof, reacting the polyhydroxypolyalkylenepolyamine with urea between 100* and 200*C. with evolution of ammonia, the ratio of moles of urea per -NH- group of said polyhydroxypolyalkylenepolyamine being from 0.5:1 to 1.8:1, continuing this reaction until an aqueous 45% solution of the resulting polyhydroxypolyalkylenepolyurea has a Gardner-Holdt viscosity at 25*C. of B to Z3, and reacting said polyhydroxypolyalkylenepolyurea with 0.5 to 3 moles of formaldehyde per -NH- group of said polyhydroxypolyalkylenepolyurea.

Claim 5

A low-viscosity printing fluid as claimed in claim 4 which is free from pigmented particulate matter and which has a viscosity of less than 15 cps at 77*F., a stability of from about one week to in excess of four months, and a transference value of from about 0 to about 3 as measured against standardized solutions of a standard thermosetting resin and a standard dye.

Claim 6

A low-viscosity printing fluid as claimed in claim 1 wherein the resin is a water-soluble, cationic, thermosetting polyhydroxypolyalkylenepolyurea-formaldehyde resin condensate prepared by a process which comprises reacting between about 0* and 100*C. in the presence of water epichlorohydrin and a polyethylenepolyamine in a mole ratio from 1:1 to 1.4:1 yielding soluble polyhydroxypolyalkylenepolyamines, continuing this reaction until an aqueous solution of the resulting polyhydroxypolyalkylenepolyamine hydrochloride at a polyamine content of about 46% has a viscosity from T to Z4 at 25*C. on the Gardner-Holdt scale, neutralizing the hydrochloride portion thereof, reacting the polyhydroxypolyalkylenepolyamine with urea between 100* and 200*C. with evolution of ammonia until an aqueous solution containing about 45% of the resulting polyhydroxypolyalkylenepolyurea has a Gardner-Holdt viscosity at 25*C. of F to Z, the ratio of urea to -NH- group of said polyhydroxypolyalkylenepolyamine in the reaction mixture being between 0.5:1 and 1.8:1, and reacting in aqueous solution at a pH between 7 and 9.5 formaldehyde and said polyhydroxypolyalkylenepolyurea in a ratio of 1 to 2 moles of formaldehyde per -NH- group of said polyurea.

Claim 7

A low-viscosity printing fluid as claimed in claim 7 which is substantially free from volatile solvents having a vapor pressure less than that of water and which has a stability of from about one week to in excess of four months, a transference value of from about 0 to about 2 as measured against atandardized solutions of a standard thermosetting resin and a standard dye, a viscosity in the range of from about 3.0 cps to about 7.0 cps, and a surface tension of from about 30 dynes/cm. to about 60 dynes per centimeter.

Claim 8

A fibrous web product having a permanent print thereon which is derived from a fluid as claimed in claim 1.