US4908392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing crosslinked polymer particles
Assignee: Mitsubishi Chemical Corp
•
Filing: 1989-03-27
•
Granted: 1990-03-13
•
Expires: 2009-03-27
Abstract
Abstract A process for producing crosslinked polymer particles which comprises a first step of polymerizing a polymerizable monomer containing from 0.1 to 2.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 μm, and a second step of letting the crosslinked polymer particles absorb from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 μm and a crosslinking degree of from 1.0 to 98%.
Inventors
- 👤 Hiroshi Kusano
- 👤 Hideaki Kiniwa
- 👤 Akihiro Shimura
- 👤 Masahiko Annaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:30
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02; C08F291/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
145 words
A process for producing porous crosslinked polymer particles which comprises a first step of polymerizing a polymerizable monomer containing from 0.1 to 2.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 μm, and a second step of letting the crosslinked polymer particles absorb a pore-forming solvent to impregnate the crosslinked particles and from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 μm and a crosslinking degree of from 1.0 to 98%.
Claim 2
Dependent Claim
145 words
A process for producing porous crosslinked polymer particles which comprises a first step of polymerizing a polymerizable monomer containing from 0.1 to 2.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 μm, and a second step of letting the crosslinked polymer particles absorb a pore-forming solvent to impregnate the crosslinked particles and from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 μm and a crosslinking degree of from 1.0 to 98%.
Claim 3
Dependent Claim
148 words
A process for producing porous crosslinked polymer particles which comprises a first step of polymerizing a glycidyl acrylate or glycidyl methacrylate and from 0 to 1.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 μm, and a second step of letting the crosslinked polymer particles absorb a pore-forming solvent to impregnate the crosslinked particles and from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 μm and a crosslinking degree of from 1.0 to 98%.
Claim 4
Dependent Claim
148 words
A process for producing porous crosslinked polymer particles which comprises a first step of polymerizing a glycidyl acrylate or glycidyl methacrylate and from 0 to 1.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 μm, and a second step of letting the crosslinked polymer particles absorb a pore-forming solvent to impregnate the crosslinked particles and from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 μm and a crosslinking degree of from 1.0 to 98%.
Claim 5
Dependent Claim
31 words
The process according to claim 1, wherein in the first step, as the polymerizable monomer other than the crosslikable monomer, an aromatic vinyl monomer or an ethylenically unsaturated carboxylate is used.
Claim 6
Dependent Claim
26 words
The process according to claim 1, wherein in the first step, as the crosslinkable monomer, an aromatic divinyl compound or a diethylenically unsaturated carboxylate is used.
Claim 7
Dependent Claim
26 words
The process according to claim 1, wherein the crosslinked polymer particles produced in the first step have a particle size of from 1 to 5 μm.
Claim 8
Dependent Claim
31 words
The process according to claim 1, wherein in the second step, as the polymerizable monomer other than the crosslikable monomer, an aromatic vinyl monomer or an ethylenically unsaturated carboxylate is used.
Claim 9
Dependent Claim
26 words
The process according to claim 1, wherein in the second step, as the crosslinkable monomer, an aromatic divinyl monomer or a diethylenically unsaturated carboxylate is used.
Claim 10
Dependent Claim
39 words
The process according to claim 1, wherein the amount of the polymerizable monomer containing the crosslinkable monomer absorbed by the crosslinked polymer particles in the second step is from 1 to 30 times by weight relative to the particles.
Claim 11
Dependent Claim
39 words
The process according to claim 1, wherein the amount of the polymerizable monomer containing the crosslinkable monomer abosorbed by the crosslinked polymer particles in the second step is from 1 to 15 times by weight relative to the particles.
Claim 12
Dependent Claim
34 words
The process according to claim 1 or 2, wherein the solubility parameter of the medium used in the first step is within a range of from 10.0 to 20.0 (cal/cm 3 ) 1/2 .
Claim 13
Dependent Claim
65 words
The process according to claim 1 or 2, wherein as the medium, a medium having an alcoholic hydroxyl group, a medium having an ether linkage, a medium having an alcoholic hydroxyl group and an ether linkage, a medium belonging to an aliphatic hydrocarbon, a medium belonging to an alicyclic hydrocarbon, a mixture of these media or a mixture of these media with water, is used.
Claim 14
Dependent Claim
41 words
The process according to claim 1 or 2, wherein the medium used in the first step contains from 1/10 to 1/3 time by weight of a diluent having a solubility parameter of from 8.0 to 9.0 (cal/cm 3 ) 1/2 .
Claim 15
Dependent Claim
25 words
The process according to claim 12, wherein the diluent is an aliphatic hydrocarbon, an alicyclic hydrocarbon, an aromatic hydrocarbon or a mixture of these diluents.
Claim 16
Dependent Claim
32 words
The process according to claim 1 or 2, wherein in the second step, the crosslinked polymer particles obtained in the first step are used in the form of an emulsion or suspension.
Claim 17
Dependent Claim
38 words
The process according to claim 1 or 2, wherein in the second step, a solvent having a polymerization initiator dissolved therein is impregnated to the crosslinked polymer particles, and then the polymerizable monomer is impregrenated to the particles.
Claim 18
Dependent Claim
29 words
The process according to claim 1 or 2, wherein in the second step, a polymerizable monomer having a polymerization initiator dissolved therein is impregnated to the crosslinked polymer particles.
Claim 19
Dependent Claim
28 words
The process according to claim 15, wherein the solvent for the polymerization initiator is a solvent which is substantially insoluble in the dispersing medium for the polymer particles.
Claim 20
Dependent Claim
26 words
The process according to claim 15, wherein in the second step, the solvent for the polymerization initiator is a halogenated aliphatic compound or an aromatic hydrocarbon.
Claim 21
Dependent Claim
35 words
The process according to claim 1, wherein in the second step, as the pore-forming solvent to be added in the monomer phase, an aromatic hydrocarbon, an aliphatic hydrocarbon or a halogenated aliphatic hydrocarbon is used.
Claim 22
Dependent Claim
37 words
The process according to claim 1 or 2, wherein the crosslinked polymer particles produced in the second step have a crosslinking degree of from 1.0 to 95% and a particle size of from 1 to 20 μm.
Claim 23
Dependent Claim
37 words
The process according to claim 1 or 2, wherein the crosslinked polymer particles produced in the second step have a crosslinking degree of from 1.0 to 95% and a particle size of from 1 to 10 μm.
Claim 24
Dependent Claim
32 words
The process according to claim 1 or 2, wherein the standard deviation of the particle size distribution of the crosslinked polymer particles produced in the second step is from 0 to 10%.
Claim 25
Dependent Claim
32 words
The process according to claim 1 or 2, wherein the standard deviation of the particle size distribution of the crosslinked polymer particles produced in the second step is from 1 to 5%.
References Cited (Backward Citations)
US3743611A
Cited
US4368218A
Cited
US4433029A
Cited
US4622346A
Cited
US4626554A
Cited
US4652609A
Cited
US4659745A
Cited
US4659600A
Cited
US4661564A
Cited
US4661386A
Cited
US4663357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |