Shear resistant printing ink vehicles

Details Shear resistant printing ink vehicles Shear resistant printing ink vehicles

2011-03-22

2011-03-22

Niland, Patrick D (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C523S161000, C525S290000, C525S374000, C525S375000, C525S379000, C525S380000, C525S381000, C525S382000, C525S540000, C527S600000, C527S603000, C530S210000, C530S211000, C530S214000, C530S221000

Reexamination Certificate

active

07910635

ABSTRACT:
The specification describes a process for making gelled ink resins which exhibit improved properties such as lower viscosity under low shear and less viscosity decrease with increasing shear. In a preferred embodiment, a rosin-based or hydrocarbon-based resin is mixed with an organic solvent and reacted with a polyamine reactant, such as melamine-formaldehyde resin or hexamethylene diamine, under conditions sufficient to produce a substantially covalently cross-link gelled resin. The resulting gelled resin resists viscosity breakdown under high shear conditions and may be used directly for making ink compositions, obviating the need for further gelation and avoiding the use of conventional organo-metallic gelling agents.

REFERENCES:
patent: 5021538 (1991-06-01), Crews
patent: 5208319 (1993-05-01), Schilling
patent: 5763565 (1998-06-01), Williams et al.
patent: 1028131 (2000-08-01), None
patent: 1395587 (1975-05-01), None
patent: 5171089 (1993-07-01), None

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