US5079125A — Three layered toner for electrophotography

Claim 1

Independent Claim 83 words

Toner for developing electrostatic latent images comprising: a core particle comprising resin with 1000-100000 in number average molecular weight (Mn 1 ), an intermediate layer coating the core particle and comprising resin with 5000-300000 in number average molecular weight (Mn 2 ) and, an outermost surface layer coating the intermediate and comprising resin with 10,000-1,000,000 in number average molecular weight (Mn 3 ); the number average molecular weights Mn 1 , Mn 2 and Mn 3 satisfies the relationship of; Mn.sub.1 <Mn.sub.2 <Mn.sub.3

Claim 2

Dependent Claim 83 words

Toner for developing electrostatic latent images comprising: a core particle comprising resin with 1000-100000 in number average molecular weight (Mn 1 ), an intermediate layer coating the core particle and comprising resin with 5000-300000 in number average molecular weight (Mn 2 ) and, an outermost surface layer coating the intermediate and comprising resin with 10,000-1,000,000 in number average molecular weight (Mn 3 ); the number average molecular weights Mn 1 , Mn 2 and Mn 3 satisfies the relationship of; Mn.sub.1 <Mn.sub.2 <Mn.sub.3

Claim 3

Dependent Claim 20 words

Toner of claim 1, in which the core particle comprising a styrene-acrylic copolymer with 2,500-100,000 in number average molecular weight.

Claim 4

Dependent Claim 24 words

Toner of claim 1, in which the core particle is a light-transmittable resin particle comprising styrene-acrylic copolymer with 2,500-12,000 in number average molecular weight.

Claim 5

Dependent Claim 20 words

Toner of claim 1, in which the core particle comprises a polyester resin with 1,000-20,000 in number average molecular weight.

Claim 6

Dependent Claim 16 words

Toner of claim 1, in which the core particles are 1-20 μm in mean particle size.

Claim 7

Dependent Claim 14 words

Toner of claim 1, in which the intermediate layer comprises a styrene-acrylic copolymer resin.

Claim 8

Dependent Claim 24 words

Toner of claim 1, in which the intermediate layer has thickness of about one fifth or less of mean particle size of core particles.

Claim 9

Dependent Claim 45 words

Toner of claim 1, in which fine resin particles with particle size of about one fifth of the mean particle size or less are adhered to the surface of the core particle, and being softened by heat or mechanical impact to form the intermediate layer.

Claim 10

Dependent Claim 17 words

Toner of claim 8, in which the fine resin particles are 0.05-3 μm in mean particle size.

Claim 11

Dependent Claim 35 words

Toner of claim 8, in which the usage of the fine resin particles is 5-50 parts by weight on the basis of 100 parts by weight of the core particles to form the intermediate layer.

Claim 12

Dependent Claim 13 words

Toner of claim 1, in which the outermost surface layer comprises styrene-acrylic copolymer.

Claim 13

Dependent Claim 32 words

Toner of claim 1, in which fine resin particles are adhered to the surface of the intermediate layer, and being softened by heat or mechanical impact to form the outermost surface layer.

Claim 14

Dependent Claim 17 words

Toner of claim 12, in which the fine resin particles are 0.05-3 μm in mean particle size.

Claim 15

Dependent Claim 15 words

Toner of claim 1, in which the outermost surface layer comprises a charge controlling agent.

Claim 16

Dependent Claim 39 words

Toner of claim 14, in which the addition amount of the charge controlling agent is 0.1-10 parts by weight on the basis of 100 parts by weight of the resin fine particles used for forming the outermost surface layer.

Claim 17

Dependent Claim 24 words

Toner of claim 11, in which the acrylic monomer component of the styrene-acrylic copolymer used for forming the outermost surface layer comprises fluorine atoms.

Claim 18

Dependent Claim 74 words

Toner of claim 11, in which the acrylic monomer component of the styrene-acrylic copolymer used for forming the outermost surface layer is amino(metha)acrylic monomer represented by the following general formula: ##STR2## in which R 1 is hydrogen or a methyl group, R 2 and R 3 are respectively hydrogen or an alkyl group having 1 to 20 carbon atoms, X is oxygen or nitrogen, and Q is an alkylene group or an allylene group.

Claim 19

Dependent Claim 68 words

Toner for developing electrostatic latent images comprising: a core particle comprising resin with 1,000-100,000 in number average molecular weight (Mn 1 ), an intermediate layer coating the core particle and comprising styrene-acrylic copolymer resin with 5,000-300,000 in number average molecular weight (Mn 2 ) and, an outermost surface layer coating the intermediate layer and comprising styrene-acrylic copolymer resin with 10,000-1,000,000 in number average molecular weight (Mn 3 )

Claim 20

Dependent Claim 68 words

Toner for developing electrostatic latent images comprising: a core particle comprising resin with 1,000-100,000 in number average molecular weight (Mn 1 ), an intermediate layer coating the core particle and comprising styrene-acrylic copolymer resin with 5,000-300,000 in number average molecular weight (Mn 2 ) and, an outermost surface layer coating the intermediate layer and comprising styrene-acrylic copolymer resin with 10,000-1,000,000 in number average molecular weight (Mn 3 )

Claim 21

Dependent Claim 47 words

Toner of claim 18, having less than 20 % or less in coefficient of variation of the toner represented by: ##EQU4## in which X 1 , X 2 -X n represent respective particle sizes of sample particles, X represents the mean value of the n particle sizes.

Claim 22

Dependent Claim 42 words

Toner of claim 18, having 110-140 in shape coefficient represented by; ##EQU5## in which "area" means an average value of the projected area of particles and "maximum length" means an average value of the longest length in the projected image of particles.

Claim 23

Dependent Claim 73 words

Toner for developing electrostatic latent images comprising: a core particle comprising thermoplastic resin, an intermediate layer coating the core particle and comprising styrene-acrylic copolymer resin with higher number average molecular weight than that of the thermoplastic resin of the core particle, an outermost surface layer coating the intermediate layer and comprising styrene-acrylic copolymer resin with higher number average molecular weight than that of the styrene-acrylic copolymer resin used for forming the intermediate layer.

Claim 24

Dependent Claim 73 words

Toner for developing electrostatic latent images comprising: a core particle comprising thermoplastic resin, an intermediate layer coating the core particle and comprising styrene-acrylic copolymer resin with higher number average molecular weight than that of the thermoplastic resin of the core particle, an outermost surface layer coating the intermediate layer and comprising styrene-acrylic copolymer resin with higher number average molecular weight than that of the styrene-acrylic copolymer resin used for forming the intermediate layer.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-01-06	1995-07-08	1996-01-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-01-06	1999-07-08	2000-01-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-01-06	2003-07-08	2004-01-07	$7700.00	Window Closed / Lapsed

Three layered toner for electrophotography

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag