Patent JPS5981258A successfully refreshed from Google Patents.
US4828955A
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US
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Microencapsulated particles and process for production thereof
Assignee: JSR Corp
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Filing: 1987-10-20
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Granted: 1989-05-09
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Expires: 2007-10-20
Abstract
Abstract Microencapsulated particles each consisting of a mother particle of a core substance and a coating layer of daughter particles formed on the surface of said mother particle, which are obtained by stirring mother particles of a core substance having a number average particle diameter of 1 to 200 μm and either or both of daughter particles (1) of a coating layer-forming material having a number average particle diameter of 1/5 of less of that of the mother particles and fragile daughter particles (2) of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined in the specification of 5 or more, at a high speed in an air stream. Said microencapsulated particles can be used in various application fields such as coatings, electronic components and electronograph. In the electronograph filed, in particular, the microencapsulated particles can effectively be used as a toner capable of providing an image of high resolution and good quality.
Inventors
- 👤 Kiyoshi Kasai
- 👤 Masayuki Hattori
- 👤 Tatsuya Shimizu
- 👤 Hiroshi Tadenuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F291/00; C08J3/126; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2433/00; C08J2433/04; C08J2433/06; C08J2433/10; C08J2433/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2989
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
128 words
Microencapsulated particles each consisting of a mother particle of a core substance and a coating layer of a coating layer-forming material formed on the surface of said mother particle, which are obtained by stirring the mother particles of a core substance having a number average particle diameter of 1 to 200 μm and either or both of (1) daughter particles of a coating layer-forming material having a number average particle diameter of 1/5 or less of that of the mother particles and (2) fragile daughter particles of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined herein of 5 or more, at a high speed in an air stream.
Claim 2
Dependent Claim
128 words
Microencapsulated particles each consisting of a mother particle of a core substance and a coating layer of a coating layer-forming material formed on the surface of said mother particle, which are obtained by stirring the mother particles of a core substance having a number average particle diameter of 1 to 200 μm and either or both of (1) daughter particles of a coating layer-forming material having a number average particle diameter of 1/5 or less of that of the mother particles and (2) fragile daughter particles of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined herein of 5 or more, at a high speed in an air stream.
Claim 3
Dependent Claim
49 words
Microencapsulated particles according to claim 1, wherein the mother particles have a number average particle diameter (Sn) of 1 to 100 μm and such a particle diameter distribution that at least 70% by weight of the mother particles have particle diameters falling within a range of 0.8Sn to 1.2Sn.
Claim 4
Dependent Claim
41 words
Microencapsulated particles according to claim 1 or 2, wherein the mother particles are particles obtained by allowing seed particles in an aqueous dispersion to absorb a highly oleophilic substance, then adding a monomer to the dispersion and thereafter polymerizing the monomer.
Claim 5
Dependent Claim
23 words
Microencapsulated particles according to claim 1 or 2, wherein the mother particles are fine particles of at least one organic or inorganic substance.
Claim 6
Dependent Claim
29 words
Microencapsulated particles according to claim 1 or 2, wherein the mother particles are porous particles having absorbed thereinto or absorbed thereon a liquid substance or a solid substance powder.
Claim 7
Dependent Claim
41 words
Microencapsulated particles according to any one of claims 1 to 5, wherein the daughter particles (1) and (2) are mixed particles of at least two types of coating layer-forming materials and at least one of these materials is a thermoplastic resin.
Claim 8
Dependent Claim
25 words
Microencapsulated particles according to any one of claims 1 to 6, wherein the coating layer has a multilayer structure consisting of at least two layers.
Claim 9
Dependent Claim
117 words
A process for producing microencapsulated particles, which comprises stirring mother particles of a core substance having a number average particle diameter of 1 to 200 μm and either or both of (1) daughter particles of a coating layer-forming material having a number average particle diameter of 1/5 or less of that of the mother particles and (2) fragile daughter particles of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined herein of 5 or more, at a high speed in an air stream, thereby forming a coating layer of said daughter particles on each of said mother particles.
Claim 10
Dependent Claim
117 words
A process for producing microencapsulated particles, which comprises stirring mother particles of a core substance having a number average particle diameter of 1 to 200 μm and either or both of (1) daughter particles of a coating layer-forming material having a number average particle diameter of 1/5 or less of that of the mother particles and (2) fragile daughter particles of a coating layer-forming material having a number average particle diameter of more than 1/5 of that of the mother particles but having a fragility index (Fr) as defined herein of 5 or more, at a high speed in an air stream, thereby forming a coating layer of said daughter particles on each of said mother particles.
Claim 11
Dependent Claim
53 words
A process for producing microencapsulated particles according to claim 8, wherein the mother particles have a number average particle diameter (Sn) of 1 to 100 μm and such a particle diameter distribution that at least 70% by weight of the mother particles have particle diameters falling within a range of 0.8Sn to 1.1Sn.
Claim 12
Dependent Claim
45 words
A process for producing microencapsulated particles according to claim 8 or 9, wherein the mother particles are particles obtained by allowing seed particles in an aqueous dispersion to absorb a highly oleophilic substance, then adding a monomer to the dispersion and thereafter polymerizing the monomer.
Claim 13
Dependent Claim
27 words
A process for producing microencapsulated particles according to claim 8 or 9, wherein the mother particles are fine particles of at least one organic or inorganic substance.
Claim 14
Dependent Claim
33 words
A process for producing microencapsulated particles according to claim 8 or 9, wherein the mother particles are porous particles having absorbed thereinto or adsorbed thereon a liquid substance or a solid substance powder.
Claim 15
Dependent Claim
45 words
A process for producing microencapsulated particles according to any one of claims 8 to 12 wherein the daughter particles (1) and (2) are mixed particles of at least two types of coating layer-forming materials and at least one of these materials is a thermoplastic resin.
Claim 16
Dependent Claim
41 words
A process for producing microencapsulated particles according to any one of claims 8 to 12, wherein the daughter particles (1) and (2) each consist of at least one substance or composition different from that constituting the surfaces of the mother particles.
Claim 17
Dependent Claim
60 words
A process for producing microencapsulated particles according to any one of claims 8 to 14, wherein the stirring of the mother particles and either or both of the daughter particles (1) and (2) at at high speed in an air stream is conducted in a container equipped with agitating blades at a blade peripheral speed of at least 15 m/sec.
Claim 18
Dependent Claim
20 words
A process for producing microencapsulated particles according to claim 15, wherein the blade peripheral speed is 40 to 150 m/sec.
Claim 19
Dependent Claim
80 words
A process for producing microencapsulated particles according to any one of claims 8 to 16, wherein the stirring of the mother particles and either or both of the daughter particles (1) and (2) at a high speed in an air stream is conducted in a container equipped with agitating blades at such a concentration that the total weight of the mother particles and the daughter particles is 10 to 100 g per liter of the internal volume of the container.
Claim 20
Dependent Claim
39 words
A process for producing microencapsulated particles according to claim 17, wherein the concentration is 20 to 70 g of the total weight of the mother particles and the daughter particles per liter of the internal volume of the container.
Claim 21
Dependent Claim
36 words
A process for producing microencapsulated particles according to any one of claims 8 to 18, wherein the number average particle diameter of the daughter particles (1) is 1/10 or less of that of the mother particles.
Claim 22
Dependent Claim
63 words
A toner for electronograph obtained by stirring (a) mother particles consisting of thermoplastic polymer particles having a number average particle diameter of 1 to 30 μm and (b) daughter particles consisting of color pigment particles and thermoplastic polymer particles having a number average particle diameter of 1/10 or less of that of the mother particles at a high speed in an air stream.
Claim 23
Dependent Claim
63 words
A toner for electronograph obtained by stirring (a) mother particles consisting of thermoplastic polymer particles having a number average particle diameter of 1 to 30 μm and (b) daughter particles consisting of color pigment particles and thermoplastic polymer particles having a number average particle diameter of 1/10 or less of that of the mother particles at a high speed in an air stream.
Claim 24
Dependent Claim
26 words
A toner according to claim 20, wherein the thermoplastic polymer of the mother particles is different in composition from the thermoplastic polymer of the daughter particles.
Claim 25
Dependent Claim
24 words
A toner according to claim 20 or 21, wherein the daughter particles consist of a mixture of the thermoplastic resin and a charge-controlling agent.
Claim 26
Dependent Claim
125 words
A toner for electronograph obtained by the first step of stirring (a) mother particles consisting of thermoplastic polymer particles having a number average particle diameter of 1 to 30 μm and (b) daughter particles consisting of color pigment particles and thermoplastic polymer particles having a number average particle diameter of 1/10 or less of that of the mother particles, at a high speed in an air stream and the second step of stirring the microencapsulated particles obtained in the first step, which are used as mother particles in the second step, and daughter particles (1) consisting of thermoplastic polymer particles and having a number average particle diameter of 1/10 or less of that of the mother particles, at a high speed in an air stream.
Claim 27
Dependent Claim
125 words
A toner for electronograph obtained by the first step of stirring (a) mother particles consisting of thermoplastic polymer particles having a number average particle diameter of 1 to 30 μm and (b) daughter particles consisting of color pigment particles and thermoplastic polymer particles having a number average particle diameter of 1/10 or less of that of the mother particles, at a high speed in an air stream and the second step of stirring the microencapsulated particles obtained in the first step, which are used as mother particles in the second step, and daughter particles (1) consisting of thermoplastic polymer particles and having a number average particle diameter of 1/10 or less of that of the mother particles, at a high speed in an air stream.
Claim 28
Dependent Claim
42 words
A toner according to claim 23, wherein the thermoplastic polymer of the first step is different in composition from the thermoplastic polymer of the mother particles in the first step and the thermoplastic polymer of the daughter particles in the second step.
Claim 29
Dependent Claim
28 words
A toner according to claim 23 or 24 wherein the daughter particles in the second step consists of a mixture of the thermoplastic polymers and a charge-controlling agent.
References Cited (Backward Citations)
US4016099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |