Patent US4401806A successfully refreshed from Google Patents.
US4401806A
Expired / Lapsed
US
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Process for producing graft copolymer
Assignee: Kureha Corp
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Filing: 1982-01-22
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Granted: 1983-08-30
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Expires: 2002-01-22
Abstract
Abstract A powdery graft copolymer is obtained by a process characterized in that a graft copolymer latex obtained by graft-polymerizing hard-polymer-giving monomers to an elastic trunk polymer is mixed, after the coagulation of the latex or in the presence of a coagulant, with an organic liquid which is hardly soluble in water and does not dissolve but can wet the graft copolymer, in such a volume ratio that a dispersion wherein water forms a continuous dispersion medium phase and the volume ratio of the organic liquid to the graft polymer is 0.9 to 7.5 is formed, whereby the coagulated graft copolymer is impregnated with the organic liquid and dispersed in water, and then the dispersed copolymer particles are recovered from the water medium. According to this process, a graft copolymer having excellent powder characteristics such as fluidity and particle size distribution can be obtained by the use of a small quantity of an organic liquid.
Inventors
- 👤 Hiroshi Hagiwara
- 👤 Takao Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:21
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02; C08F6/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
A process for producing a graft copolymer, which comprises mixing a graft copolymer latex obtained by graft-polymerizing hard-polymer-giving monomers onto an elastic trunk polymer with an organic liquid, either after the coagulation of the latex or in the presence of a coagulant, said organic liquid being substantially insoluble in water and does not dissolve but can wet the graft copolymer, said mixture being effected in the presence of water to form dispersion wherein water forms a continuous dispersion medium phase and wherein the volume ratio of the organic liquid to the graft copolymer is 0.9 to 7.5 and the total volume of the graft copolymer and the organic liquid is less than 40% of the volume of the dispersion, whereby the coagulated graft copolymer is impregnated with the organic liquid and dispersed in water, and subsequently recovering the dispersed copolymer particles from the dispersion.
Claim 2
Dependent Claim
144 words
A process for producing a graft copolymer, which comprises mixing a graft copolymer latex obtained by graft-polymerizing hard-polymer-giving monomers onto an elastic trunk polymer with an organic liquid, either after the coagulation of the latex or in the presence of a coagulant, said organic liquid being substantially insoluble in water and does not dissolve but can wet the graft copolymer, said mixture being effected in the presence of water to form dispersion wherein water forms a continuous dispersion medium phase and wherein the volume ratio of the organic liquid to the graft copolymer is 0.9 to 7.5 and the total volume of the graft copolymer and the organic liquid is less than 40% of the volume of the dispersion, whereby the coagulated graft copolymer is impregnated with the organic liquid and dispersed in water, and subsequently recovering the dispersed copolymer particles from the dispersion.
Claim 3
Dependent Claim
28 words
A process for producing a graft copolymer according to claim 1, wherein the volume ratio of the orlganic liquid to the graft copolymer is from 1 to 5.
Claim 4
Dependent Claim
25 words
A process for producing a graft copolymer according to claim 1 or 2, wherein the latex is mixed, after its coagulation, with the organic liquid.
Claim 5
Dependent Claim
35 words
A process of producing a graft copolymer according to claim 1 or 2, wherein the latex is added to and mixed with a mixture of an aqueous solution of a coagulant and the organic liquid.
Claim 6
Dependent Claim
35 words
A process for producing a graft copolymer according to claim 1 or 2, wherein a mixture of the organic liquid and the latex is added to and mixed with an aqueous solution of a coagulant.
Claim 7
Dependent Claim
33 words
A process for producing a graft copolymer according to claim 1 or 2, wherein the organic liquid and the latex are simultaneously added to and mixed with an aqueous solution of a coagulant.
Claim 8
Dependent Claim
35 words
A process for producing a graft copolymer according to claim 1 or 2, wherein an aqueous solution of a coagulant is added to and mixed with a mixture of the organic liquid and the latex.
Claim 9
Dependent Claim
41 words
A process for producing a graft copolymer according to claim 1 or 2, wherein the latex, the organic liquid and an aqueous solution of a coagulant are simultaneously and continuously charged into a mixing vessel and are mixed with each other.
Claim 10
Dependent Claim
30 words
A process for producing a graft copolymer according to claim 8, wherein the dispersion liquid obtained is continuously withdrawn in order to carry out coagulation and mixing simultaneously and continuousy.
Claim 11
Dependent Claim
27 words
A process for producing a graft copolymer according to claim 1, wherein the surface tension of the organic liquid is 35 dyne/cm or lower at room temperature.
Claim 12
Dependent Claim
33 words
A process for producing a graft copolymer according to claim 1, wherein the organic liquid impregnating the graft copolymer particles is removed prior to the recovery of the copolymer particles from the dispersion.
Claim 13
Dependent Claim
30 words
A process for producing a graft copolymer according to claim 11, wherein the removal of the organic liquid is carried out by heating the dispersion to 40° to 100° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |