| 摘要 |
<p>Process for preparation of toner particles for electrostatic imaging comprising
<UnorderedLists id="ula01" listStyle="none"><ListItem>A. dispersing at an elevated temperature in a vessel a thermoplastic resin, a dispersant nonpolar liquid having a Kauri-butanol value of less than 30 and optionally a colorant, the temperature being maintained to plasticize and liquify the resin and below that at which the nonpolar liquid degrades and any component decomposes;</ListItem><ListItem>B. cooling the dispersion, either
<UnorderedLists id="ula02" listStyle="none"><ListItem>(1) with or without stirring to form a gel or solid mass, the shredding and grinding the mass by means of particulate media in the presence of additional liquid:</ListItem><ListItem>(2) with stirring to form a viscous mixture and grinding by means of particulate media in the presence of additional liquid; or</ListItem><ListItem>(3) while grinding with particulate media thereby preventing formation of a gel or solid mass in the presence of additional liquid, and</ListItem></UnorderedLists></ListItem><ListItem>C. separating the dispersion of toner particles, average by area particle size less than 10 µm,from particulate media, the improvement whereby there is present, at least during the grinding in step B, 0.5 to 99% by weight of a polar additive having a Kauri-butanol value of at least 30, the percentage based on the total weight of liquid.</ListItem></UnorderedLists></p><p>The dispersion having a concentration of toner particles is useful for the preparation of copies and proofs of various colors.</p> |
