The present invention was investigated for the purpose of providing a
binder resin for toner which is excellent in the low temperature fixing
property which can cope with the development of high-speed copier
machines, and is excellent in the offset resistance, blocking resistance,
pulverizability and development durability.As a result, it was found that
the purpose could be achieved by using, as a binder resin for toner, a
resin that can be obtained from at least three different vinyl polymers
with different molecular weight, contents of functional groups, and
preferably from a crosslinking agent having the vinyl polymer structure,
and that contains a specific gel component. This resin has excellent
melting property at low temperatures, and has suitable performance as a
material for toner and a toner in high-speed copier machines.