Low gloss, low melt cross-linked toner resins
AssigneeXerox Corporation
InventorsHadi K. Mahabadi, Enno E. Agur, Edul N. Dalal
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Abstract
A low melt, low gloss toner resin with low minimum fix temperature and wide fusing latitude contains a linear portion and 20-45% by weight of a cross-linked portion containing high density, cross-linked microgel particles, but substantially free of low density, cross-linked polymer. The resin is particularly suitable for low gloss applications such as black only and highlighting and for high speed fusing, shows excellent offset resistance and wide fusing latitude and superior vinyl offset properties. The resin may be formed by reactive melt mixing.
Claims33
A low melt, low gloss toner resin substantially free of sol comprising uncross-linked portions and cross-linked portions, said cross-linked portions consisting essentially of high density cross-linked microgel particles, wherein said microgel particles are present in an amount from about 20 to 45 percent by weight of said toner resin.
A low fix temperature, low gloss toner substantially free of sol comprising colorant and toner resin, said toner resin consisting essentially of an uncross-linked phase and highly cross-linked microgel particles present in an amount from about 20 to about 45 percent by weight of said toner resin.
A reactive melt mixing process for preparing low fix temperature, low gloss toner resin substantially free of sol comprising linear and cross-linked portions, said cross-linked portions consisting essentially of high density, cross-linked microgel particles, comprising the steps of:
- (a) melting a reactive base resin, thereby forming a polymer melt;
- and
- (b) cross-linking a portion of said polymer melt under high shear to form uniformly dispersed microgel particles in an amount of from about 20 to about 45 percent by weight of said toner resin.
Dependencies are inferred from the claim text.