EP0198089A1
Expired / Lapsed
EP
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Encapsulated polymer particles and process for their production
Assignee: JSR Corp
•
Filing: 1985-10-02
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Granted: —
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Expires: 2005-10-02
Abstract
Abstract Encapsulated polymer particles containing therein an oily substance as core are obtained by finely dispersing a polymerizable monomer component containing a crosslinkable monomer and a hydrophilic monomer and an oily substance to form an oil-in-water emulsion, and polymerizing the polymerizable monomer component. Hollow capsule polymer particles can be obtained by removing the oily substance contained in the capsules. The polymer particles have excellent mechanical strengths and heat resistance, thus being usable in various uses.
Inventors
- 👤 Kiyoshi Kasai
- 👤 Masayuki Hattori
- 👤 Hiromi Takeuchi
- 👤 Nobuo Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J13/185; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
54 words
A process for producing capsule-shaped polymer particles which comprises finely dispersing a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water emulsion and then polymerizing the polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 2
Dependent Claim
54 words
A process for producing capsule-shaped polymer particles which comprises finely dispersing a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water emulsion and then polymerizing the polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 3
Dependent Claim
78 words
A process for producing capsule-shaped polymer particles which comprises finely dispersing a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water emulsion, polymerizing the polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof, and then removing the oily substance from the capsule-shaped polymer particles to produce capsule-shaped polymer particles either containing nothing or containing water in the inside thereof.
Claim 4
Dependent Claim
78 words
A process for producing capsule-shaped polymer particles which comprises finely dispersing a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water emulsion, polymerizing the polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof, and then removing the oily substance from the capsule-shaped polymer particles to produce capsule-shaped polymer particles either containing nothing or containing water in the inside thereof.
Claim 5
Dependent Claim
56 words
The process for producing capsule-shaped polymer particles or hollow polymer particles as claimed in Claim 1 or 2, wherein the polymerizable monomer component comprises 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer.
Claim 6
Dependent Claim
80 words
A process for producing capsule-shaped polymer particles which comprises adding a polymer to a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer and an oily substance, said polymer being different from that resulting from polymerization of the monomer component, to prepare an oily solution, finely dispersing the oily solution in water to prepare an oil-in-water emulsion, and then polymerizing the above polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 7
Dependent Claim
80 words
A process for producing capsule-shaped polymer particles which comprises adding a polymer to a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer and an oily substance, said polymer being different from that resulting from polymerization of the monomer component, to prepare an oily solution, finely dispersing the oily solution in water to prepare an oil-in-water emulsion, and then polymerizing the above polymerizable monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 8
Dependent Claim
36 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4, further including a step of removing the oily substance to produce capsule-shaped polymer particles either containing nothing or containing water in the inside thereof.
Claim 9
Dependent Claim
87 words
A process for producing capsule-shaped polymer particles which comprises dispersing finely divided particles of a polymer in water, said polymer being different from that resulting from polymerization of a polymerizable monomer component as described below, adding a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance to make the monomer component and the oily substance absorbed in the finely divided polymer particles, and then polymerizing the monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 10
Dependent Claim
87 words
A process for producing capsule-shaped polymer particles which comprises dispersing finely divided particles of a polymer in water, said polymer being different from that resulting from polymerization of a polymerizable monomer component as described below, adding a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance to make the monomer component and the oily substance absorbed in the finely divided polymer particles, and then polymerizing the monomer component to produce capsule-shaped polymer particles containing the oily substance in the inside thereof.
Claim 11
Dependent Claim
37 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, further including . a step of removing the oily substance to produce capsule-shaped polymer particles either containing nothing or containing water in the inside thereof.
Claim 12
Dependent Claim
89 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the monomer component comprises 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and the amount of the polymer different from that resulting from polymerization of the monomer component being used is 1 to 100 parts by weight per 100 parts by weight of the total weight of the monomer component.
Claim 13
Dependent Claim
61 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, wherein prior to addition of the monomer component and the oily substance to the finely divided polymer particles, a substance having a solubility in water of not more than 10- 3 wt% is added to the finely divided polymer particles so as to make it absorbed in the particles.
Claim 14
Dependent Claim
38 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein a number average molecular weight of the polymer different from that resulting from polymerization of the monomer component is not more than 20,000.
Claim 15
Dependent Claim
38 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein a number average molecular weight of the polymer different from that resulting from polymerization of the monomer component is not more than 7,000.
Claim 16
Dependent Claim
40 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, wherein the polymer different from that resulting from polymerization of the above polymerizable monomer component is a particle having an average particle diameter of 0.1 to 0.4 µm.
Claim 17
Dependent Claim
46 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4, wherein in adding the polymer different from that resulting from polymerization of the monomer component to the monomer component and the oily substance, it is dissolved in the monomer component and/or the oily substance.
Claim 18
Dependent Claim
67 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the above oily substance is the same as at least one monomer of the above polymerizable monomer component, and the above polymerizable monomer component is polymerized insufficiently so that the polymerizable monomer component remaining unpolymerized in the inside of the polymer particle functions as an oily substance.
Claim 19
Dependent Claim
70 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the cross-linkable monomer is at least one monomer selected from the group consisting of divinylbenzene, ethylene glycol dimethacrylate, and trimethylolpropane trimethacrylate, and the hydrophilic monomer is at least one monomer selected from the group consisting of methyl methacrylate, vinylpyridine, 2-hydroxyethyl methacrylate, methacrylic acid, acrylic acid, glycidyl methacrylate, and dimethylaminoethyl methacrylate.
Claim 20
Dependent Claim
100 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the cross-linkable monomer is divinylbenzene, the hydrophilic monomer is at least one monomer selected from the group consisting of methyl methacrylate, 2-hydroxyethyl methacrylate, and methacrylic acid, and the polymer different from that resulting from polymerization of the monomer component is at least one polymer selected from the group consisting of polystyrene, carboxy-modified polystyrene, a styrene-butadiene copolymer, a styrene-acrylate copolymer, a styrene-methacrylate copolymer, an acrylate copolymer, a methacrylate copolymer, a carboxy-modified styrene-acrylate copolymer, a carboxy-modified styrene-methacrylate copolymer, a carboxy-modified acrylate copolymer, and a carboxy-modified methacrylate copolymer.
Claim 21
Dependent Claim
40 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the oily substance is at least one substance selected from the group consisting of toluene, benzene, xylene, cyclohexane, and n-hexane.
Claim 22
Dependent Claim
49 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 2, 5 and 7, wherein the step of removing the oily substance is at least one treatment selected from steam stripping, gas blowing, and pressure reduction to an aqueous medium containing the capsule-shaped polymer particles.
Claim 23
Dependent Claim
37 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 2, 5 and 7, wherein the step of removing the oily substance is treatment to dry the recovered capsule-shaped polymer particles after polymerization.
Claim 24
Dependent Claim
41 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the aqueous dispersion containing the above cross-linkable monomer and the hydrophilic monomer is introduced in a polymerization reactor continuously or batchwise.
Claim 25
Dependent Claim
74 words
A capsule-shaped polymer particle having a shell which is made of a copolymer of a polymerizable monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and which has an outer diameter of 0.2 to 0.6 µm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 26
Dependent Claim
74 words
A capsule-shaped polymer particle having a shell which is made of a copolymer of a polymerizable monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and which has an outer diameter of 0.2 to 0.6 µm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 27
Dependent Claim
97 words
A capsule-shaped polymer particle having a shell which is made of a mixture of 100 parts by weight of a copolymer of a polymerizable monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and 1 to 100 parts by weight of a polymer different from the above copolymer, and which has an outer diameter of 0.2 to 0.6 pm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 28
Dependent Claim
97 words
A capsule-shaped polymer particle having a shell which is made of a mixture of 100 parts by weight of a copolymer of a polymerizable monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer, and 0 to 85 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and 1 to 100 parts by weight of a polymer different from the above copolymer, and which has an outer diameter of 0.2 to 0.6 pm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 29
Dependent Claim
48 words
The polymer particle as claimed in Claim 21 or 22, wherein the polymerizable monomer component comprises 2 to 20 wt% of a cross-linkable monomer, 50 to 95 wt% of a hydrophilic monomer, and 0 to 48 wt% of a monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer.
Claim 30
Dependent Claim
59 words
The polymer particle as claimed in Claim 21 or 22, wherein the cross-linkable monomer is divinylbenzene, the hydrophilic monomer is at least one monomer selected from the group consisting of methyl methacrylate, vinylpyridine, 2-hydroxyethyl methacrylate, and not more than 20 wt% of an unsaturated carboxylic acid, and the monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer is styrene.
Claim 31
Dependent Claim
44 words
The polymer particle as claimed in Claim 21 or 22, containing in the inside thereof 2 to 50 parts by weight of the monomer component containing not less than 50 wt% of styrene, per 100 parts by weight of the polymer constituting the shell.
Claim 32
Dependent Claim
54 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises finely dispersing a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer, and the oily substance in water to prepare an oil-in-water type emulsion and then polymerizing the radical polymerizable vinyl monomer component.
Claim 33
Dependent Claim
54 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises finely dispersing a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer, and the oily substance in water to prepare an oil-in-water type emulsion and then polymerizing the radical polymerizable vinyl monomer component.
Claim 34
Dependent Claim
72 words
A process for producing capsule-shaped hollow or water containing polymer particles which comprises finely dispersing a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water type emulsion, polymerizing the radical polymerizable vinyl monomer component to prepare capsule-shaped polymer particles containing the oily substance in the inside thereof, and then removing the oily substance from the capsule-shaped polymer particles..
Claim 35
Dependent Claim
72 words
A process for producing capsule-shaped hollow or water containing polymer particles which comprises finely dispersing a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance in water to prepare an oil-in-water type emulsion, polymerizing the radical polymerizable vinyl monomer component to prepare capsule-shaped polymer particles containing the oily substance in the inside thereof, and then removing the oily substance from the capsule-shaped polymer particles..
Claim 36
Dependent Claim
59 words
The process for producing capsule-shaped polymer particles or hollow polymer particles as claimed in Claim 1 or 2, wherein the radical polymerizable vinyl monomer component comprises 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer.
Claim 37
Dependent Claim
81 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises adding a polymer to a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer and the oily substance, said polymer being different from that resulting from polymerization of the radical polymerizable vinyl monomer component, to prepare an oily solution, finely dispersing the oily solution in water to prepare an oil-in-water emulsion, and then polymerizing the radical polymerizable vinyl monomer component.
Claim 38
Dependent Claim
81 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises adding a polymer to a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer and the oily substance, said polymer being different from that resulting from polymerization of the radical polymerizable vinyl monomer component, to prepare an oily solution, finely dispersing the oily solution in water to prepare an oil-in-water emulsion, and then polymerizing the radical polymerizable vinyl monomer component.
Claim 39
Dependent Claim
30 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4, further including a step of removing the oily substance to produce capsule-shaped hollow or water containing polymer particles.
Claim 40
Dependent Claim
92 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises adding a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer and the oily substance to a dispersion as nrepared by dispersing fine particles of a polymer in water, said polymer being different from that resulting from polymerization of the radical polymerizable vinyl monomer component, to thereby make the radical polymerizable vinyl monomer component and the oily substance absorbed on the particles, and then polymerizing the radical polymerizable vinyl monomer component.
Claim 41
Dependent Claim
92 words
A process for producing capsule-shaped polymer particles containing an oily substance in the inside thereof which comprises adding a radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer and the oily substance to a dispersion as nrepared by dispersing fine particles of a polymer in water, said polymer being different from that resulting from polymerization of the radical polymerizable vinyl monomer component, to thereby make the radical polymerizable vinyl monomer component and the oily substance absorbed on the particles, and then polymerizing the radical polymerizable vinyl monomer component.
Claim 42
Dependent Claim
30 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, further including a step of removing the oily substance to produce capsule-shaped hollow or water containing polymer particles.
Claim 43
Dependent Claim
81 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the radical polymerizable vinyl monomer component comprises 1 to 50 wt%, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other radical polymerizable vinyl monomer component copolymerizable with the cross-linkable monomer or hydrophilic monomer, and the amount of the different polymer used is 1 to 100 parts by weight per 100 parts by weight of the weight of all monomer components.
Claim 44
Dependent Claim
56 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, wherein prior to absorption of the radical polymerizable vinyl monomer component and the oily substance onto the finely divided polymer particles, a substance having a solubility in water of not more than 10 -3 wt% is made absorbed on the finely divided polymer particles.
Claim 45
Dependent Claim
41 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the number average molecular weight of the polymer different from that resulting from polymerization of the radical polymerizable vinyl monomer component is not more than 20,000.
Claim 46
Dependent Claim
41 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the number average molecular weight of the polymer different from that resulting from polymerization of the radical polymerizable vinyl monomer component is not more than 7,000.
Claim 47
Dependent Claim
38 words
The process for producing capsule-shaped polymer particles as claimed in Claim 6, wherein the polymer different from that resulting from polymerization of the radical polymerizable vinyl monomer component has an average particle diameter of 0.1 to 0.4 jnm.
Claim 48
Dependent Claim
46 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4, wherein the polymer different from that resulting from polymerization of the radical polymerizable vinyl monomer component is in the state that is dissolved in the radical polymerizable vinyl monomer component and/or the oily substance.
Claim 49
Dependent Claim
70 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the oily substance is the same as at least one monomer of the radical polymerizable vinyl monomer component, and the radical polymerizable vinyl monomer component is polymerized incompletely so that the radical polymerizable vinyl monomer component remaining unpolymerized in the inside of the polymer particles functions as an oily substance.
Claim 50
Dependent Claim
60 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the cross-linkable monomer is at least one selected from divinylbenzene, ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate, and the hydrophilic monomer is at least one selected from methyl methacrylate, vinylpyridine, 2-hydroxyethyl methacrylate, methacrylic acid, acrylic acid, glycidyl methacrylate and dimethylaminoethyl methacrylate.
Claim 51
Dependent Claim
88 words
The process for producing capsule-shaped polymer particles as claimed in Claim 4 or 6, wherein the cross-linkable monomer is at least one selected from methyl methacrylate, 2-hydroxyethyl methacrylate and methacrylic acid, and the polymer different from that resulting from polymerization of the radical polymerizable vinyl monomer component is at least one selected from polystyrene, carboxy-modified polystyrene, a styrene-butadiene copolymer, a styrene-acrylate copolymer, a styrene-methacrylate copolymer, an acrylate copolymer, a methacrylate copolymer, a carboxy-modified styrene-acrylate copolymer, a carboxy-modified styrene-methacrylate copolymer, a carboxy-modified acrylate copolymer and a carboxy-modified methacrylate copolymer.
Claim 52
Dependent Claim
35 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the oily substance is at least one selected from toluene, benzene, xylene, cyclohexane and n-hexane.
Claim 53
Dependent Claim
57 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 2, 5 and 7, wherein the step of removing the oily substance is at least one treatment selected from steam stripping treatment, gas blowing treatment, and pressure reduction treatment which are applied to an aqueous dispersion of the capsule-shaped polymer particles after polymerization.
Claim 54
Dependent Claim
37 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 2, 5 and 7, wherein the step of removing the oily substance is drying treatment of the recovered capsule-shaped polymer particles after polymerization.
Claim 55
Dependent Claim
47 words
The process for producing capsule-shaped polymer particles as claimed in any one of Claims 1, 2, 4 and 6, wherein the aqueous dispersion containing the radical polymerizable vinyl monomer component containing a cross-linkable monomer and a hydrophilic monomer is continuously or batchwise introduced in a polymerization reactor.
Claim 56
Dependent Claim
77 words
A capsule-shaped polymer particle having a shell which is made of a copolymer of a radical polymerizable vinyl monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and which has an outer diameter of 0.2 to 0.6 jzm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 57
Dependent Claim
77 words
A capsule-shaped polymer particle having a shell which is made of a copolymer of a radical polymerizable vinyl monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and which has an outer diameter of 0.2 to 0.6 jzm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 58
Dependent Claim
97 words
A capsule-shaped polymer particle having a shell which is made of 100 parts by weight of a copolymer of a radical polymerizable vinyl monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and 1 to 100 parts by weight of a polymer different from the above copolymer, and which has an outer diameter of 0.2 to 0.6 µm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 59
Dependent Claim
97 words
A capsule-shaped polymer particle having a shell which is made of 100 parts by weight of a copolymer of a radical polymerizable vinyl monomer component comprising 1 to 50 wt% of a cross-linkable monomer, 3 to 99 wt% of a hydrophilic monomer and 0 to 85 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer, and 1 to 100 parts by weight of a polymer different from the above copolymer, and which has an outer diameter of 0.2 to 0.6 µm and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 60
Dependent Claim
52 words
The capsule-shaped polymer particle as claimed in Claim 21 or 22, wherein the radical polymerizable vinyl monomer component comprises 2 to 20 wt% of a cross-linkable monomer, 50 to 95 wt% of a hydrophilic monomer and 0 to 48 wt% of other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer.
Claim 61
Dependent Claim
58 words
The capsule-shaped polymer particle as claimed in Claim 21 or 22, wherein the cross-linkable monomer is divinylbenzene, the hydrophilic monomer is at least one monomer selected from methyl methacrylate, vinylpyridine, 2-hydroxyethyl methacrylate, and not more than 20 wt% of an unsaturated carboxylic acid, and the other polymerizable monomer copolymerizable with the cross-linkable monomer or hydrophilic monomer is styrene.
Claim 62
Dependent Claim
48 words
The capsule-shaped polymer particle as claimed in Claim 21 or 22, containing in the inside thereof 2 to 50 parts by weight of a polymer of a monomer component containing not less than 50 wt% of styrene, per 100 parts by weight of the polymer constituting the shell.
References Cited (Backward Citations)
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