Abstract Herein disclosed is a binder for dry toners which comprises a copolymer resin obtained by reacting 10 to 50% by weight of a polyester resin which has free carboxyl groups, whose acid value ranges from 10 to 100 and whose number-average molecular weight ranges from 1,000 to 5,000 and 90 to 50% by weight of a mixture of a vinyl compound having a glycidyl group and the an another vinyl compound, wherein the amount of the vinyl compound having a glycidyl group corresponds to the number of the glycidyl groups equal to 0.25 to 1.5 time that of the carboxyl groups present in the polyester resin. The binder for dry toners is used in the electrophotography technique.
A binder for dry toners comprising a copolymer resin obtained by reacting 10 to 50% by weight of a polyester resin which has free carboxyl groups, whose acid value ranges from 10 to 100 and whose number-average molecular weight ranges from 1,000 to 5,000 and 90 to 50% by weight of a mixture of a vinyl compound having a glycidyl group and an another vinyl compound, wherein the amount of the vinyl compound having a glycidyl group corresponds to the number of the glycidyl groups equal to 0.25 to 1.5 time that of the carboxyl groups present in the polyester resin.
Claim 2
Dependent Claim
101 words
A binder for dry toners comprising a copolymer resin obtained by reacting 10 to 50% by weight of a polyester resin which has free carboxyl groups, whose acid value ranges from 10 to 100 and whose number-average molecular weight ranges from 1,000 to 5,000 and 90 to 50% by weight of a mixture of a vinyl compound having a glycidyl group and an another vinyl compound, wherein the amount of the vinyl compound having a glycidyl group corresponds to the number of the glycidyl groups equal to 0.25 to 1.5 time that of the carboxyl groups present in the polyester resin.
Claim 3
Dependent Claim
24 words
The binder for dry toners as set forth in claim 1 wherein the acid value of the polyester resin ranges from 15 to 80.
Claim 4
Dependent Claim
36 words
The binder for dry toners as set forth in claim 1 wherein the vinyl compound having a glycidyl group is a member selected from the group consisting of allyl glycidyl ether, glycidyl acrylate and glycidyl methacrylate.
Claim 5
Dependent Claim
50 words
The binder for dry toners as set forth in claim 1 wherein the amount of the vinyl compound having a glycidyl group is used in an amount corresponding to the number of glycidyl groups equal to 0.5 to 1.0 time that of the carboxyl groups present in the polyester resin.
Claim 6
Dependent Claim
27 words
The binder for dry toners as set forth in claim 1 wherein the glass transition point of the copolymer resin ranges from 50 to 70 C .