Encapsulated lyophilic magnetic particle and resin toner

Claim 2

A magnetic toner comprising a nuclear particle which comprises lyophilic magnetic particles and a resin having a low softening point, said particles being encapsulated within a resin wall, wherein said magnetic particles are made lyophilic by treatment with a titanate coupling agent and/or a silane coupling agent.

Claim 3

A magnetic toner according to claim 1, wherein said resin having a low softening point comprises a polymer which contain as a structural unit an α,β-unsatulated ethylenic monomer.

Claim 4

A magnetic toner according to claim 2, wherein said α,β-unsaturated ethylenic monomer is selected from the group consisting of a styrenes and an esters of α-methylene aliphatic monocarboxylic acid.

Claim 5

A magnetic toner according to claim 2, wherein said polymer is a copolymer of a styrenes and an esters of α-methylene aliphatic monocarboxylic acid.

Claim 6

A magnetic toner according to claim 3 or 4, wherein said styrenes is a styrene.

Claim 7

A magnetic toner according to claim 3 or 4, wherein said esters of α-methylene aliphatic monocarboxylic acid is an acrylate or a methacrylate.

Claim 8

A magnetic toner according to claim 2, wherein said resin has softening point not exceeding 100° C.

Claim 9

A magnetic toner according to claim 1, wherein said magnetic particles is a magnetite.

Claim 10

A magnetic toner according to claim 1, wherein said resin wall comprises a polystyrenes, a styrene-butadiene copolymer, a styrene-acrylic acid copolymer, a styrene-maleic anhydride copolymer, a polyester resins, an acrylic resins, a xylene resins, a polyamide resins, an ionomer resins, a furan resins, a ketone resins, a terpene resins, a phenol modified terpene resins, a rosins, a rosin modified pentaerythritol esters, a natural resin modified phenolic resins, a natural resin modified maleic resins, a cumaroneindene resins, a maleic acid modified phenolic resins, an alicyclic hydrocarbon resins, a petroleum resins, a cellulose phthalate acetate, a methyl vinyl ether-maleic anhydride copolymers, a graft polymers of starch, a polyvinyl butyral, a polyvinyl alcohol, a polyvinyl pyrrolidone, a chlorinated paraffin, a wax or a aliphatic acids.

Claim 11

A magnetic toner according to claim 1, wherein said resin wall further comprises a releasing agent.

Claim 12

A magnetic toner according to claim 10, wherein said releasing agent is a low-molecular polyolefine.

Claim 13

A magnetic toner according to claim 11, wherein said low-molecular polyolefine has a softening point of 80°-180° C.

Claim 14

A magnetic toner according to claim 12, wherein said low-molecular polyolefine has a softening point of 100°-160° C.

Claim 15

A magnetic toner according to claim 1, wherein said toner further comprises a coloring agent.

Claim 16

A magnetic toner according to claim 14, wherein said coloring agent is included in the nuclear particles.

Claim 17

A magnetic toner according to claim 14, wherein said coloring agent is included in the resin wall.

Claim 18

The toner of claim 1 wherein said coupling agent is a titanate coupling agent.

Claim 19

A method of fixing a toner image on a sheet bearing said toner image by passing said sheet between a fixing roller and a pressure roller being pressure contacted with said fixing roller, the toner image consiting essentially of the magnetic toner of claim 1.

Claim 20

A method of fixing according to claim 18, wherein said linear pressure between rollers is at least 10 kg/cm.

Claim 21

A magnetic toner comprising a nuclear particle which comprises lyophilic magentic particles and a resin having a low softening point, said particle being encapsulated within a resin wall, wherein said magnetic particles are made lyophilic by treatment with a titanate coupling agent selected from the class consisting of formulas I, II, III, IV and V ##STR5## wherein R 1 represents an alkyl group having 1 to 18 carbon atoms or an aralkyl group; R 2 represents --OR 1 or --OOCR 1 , R 3 represents --OOCR 1 , --O 3 SR 4 or ##STR6## R 4 represents R 1 or an aryl group, R 5 represents R 1 or R 3 , R 6 represents R 1 or an aryl group; n represents an integer of from 2 to 20, w represents 1, 2 or 3, x represents 0 or 1, and y represents an integer of from 1 to 3.

Claim 22

A magnetic toner comprising a nuclear particle which comprises lyophilic magentic particles and a resin having a low softening point, said particle being encapsulated within a resin wall, wherein said magnetic particles are made lyophilic by treatment with a titanate coupling agent selected from the class consisting of formulas I, II, III, IV and V ##STR5## wherein R 1 represents an alkyl group having 1 to 18 carbon atoms or an aralkyl group; R 2 represents --OR 1 or --OOCR 1 , R 3 represents --OOCR 1 , --O 3 SR 4 or ##STR6## R 4 represents R 1 or an aryl group, R 5 represents R 1 or R 3 , R 6 represents R 1 or an aryl group; n represents an integer of from 2 to 20, w represents 1, 2 or 3, x represents 0 or 1, and y represents an integer of from 1 to 3.

Claim 23

A magnetic toner comprising a nuclear particle which comprises lyophilic magnetic particles and the resin having a low softening point, wherein said nuclear particles are encapsulated by a resin wall and said magnetic particles are made lyophilic by treatment with a silane coupling agent selected from the group consisting of Formulas B-1 to B-8 ##STR7##

Claim 24

A magnetic toner comprising a nuclear particle which comprises lyophilic magnetic particles and the resin having a low softening point, wherein said nuclear particles are encapsulated by a resin wall and said magnetic particles are made lyophilic by treatment with a silane coupling agent selected from the group consisting of Formulas B-1 to B-8 ##STR7##