US4419496A
Expired / Lapsed
US
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Particle agglomeration in rubber latices
Assignee: DIAMOND TECHNOLOGY PARTNERSHIP Co
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Filing: 1982-02-22
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Granted: 1983-12-06
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Expires: 2002-02-22
Abstract
Abstract Particle size distribution in elastomeric latex preparations is advantageously controlled and improved by treatment of the prepared latex with an agglomerating agent (AgAg) copolymer having an elastomeric "core" and grafted thereto a "shell" of interpolymer comprising polymerized acid and ester comonomers. The grafted interpolymer can beneficially be a polymerized mixture of ethyl acrylate and methacrylic acid. Agglomerated latex product can be recovered for direct utilization of its favorably particle size-distributed elastomeric component or for other purposes such as grafted polymer blends, ABS and similar products.
Inventors
- 👤 David E. Henton
- 👤 Teresa M. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:57
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08C; C08C1/00; C08C1/02; C08C1/065; C08C1/07; C08F291/00; C08F291/02; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
175 words
An agglomerating agent (AgAg) suitable for agglomerating the particles of a latex of an elastomeric material which AgAg is a dispersion of particles having core material and shell material, said AgAg comprising: (a) as shell material substantially grafted to the core material, from about 5 to about 50 weight percent, based on the total weight of the AgAg of a polymerized mixture of: (i) from about 80 to about 99.5 weight percent based on the total weight of component (a) of ester monomer of the formula: ##STR7## wherein R 1 is a lower alkyl radical containing up to about 4 carbon atoms; and (ii) from about 0.5 to about 20 weight percent based on weight component (a) of an ethylenically unsaturated mono- or difunctional carboxylic acid having from about 3 to about 8 carbons; (b) as core material, from about 50 to about 95 weight percent, based on the total weight of the AgAg, of an elastomeric material, such core material having polymerized therein essentially no ester monomer which is polymerized in the shell material.
Claim 2
Dependent Claim
175 words
An agglomerating agent (AgAg) suitable for agglomerating the particles of a latex of an elastomeric material which AgAg is a dispersion of particles having core material and shell material, said AgAg comprising: (a) as shell material substantially grafted to the core material, from about 5 to about 50 weight percent, based on the total weight of the AgAg of a polymerized mixture of: (i) from about 80 to about 99.5 weight percent based on the total weight of component (a) of ester monomer of the formula: ##STR7## wherein R 1 is a lower alkyl radical containing up to about 4 carbon atoms; and (ii) from about 0.5 to about 20 weight percent based on weight component (a) of an ethylenically unsaturated mono- or difunctional carboxylic acid having from about 3 to about 8 carbons; (b) as core material, from about 50 to about 95 weight percent, based on the total weight of the AgAg, of an elastomeric material, such core material having polymerized therein essentially no ester monomer which is polymerized in the shell material.
Claim 3
Dependent Claim
56 words
The AgAg according to claim 1 wherein subcomponent (ii), the acid monomer has the formula: ##STR8## wherein R 2 and R 3 are independently selected from the group consisting of --H and --COOH and R 4 is selected from the group consisting of --H, --COOH and lower alkyl radicals containing up to about 4 carbon atoms.
Claim 4
Dependent Claim
26 words
The AgAg according to claim 2 which is suitable for agglomerating the particles of a latex of an elastomeric material which is at least 95% polymerized.
Claim 5
Dependent Claim
38 words
The AgAg according to claim 3 wherein component (b), the core material, is at least about 65 weight percent of the AgAg, and component (a), the shell material, is less than about 35 weight percent of the AgAg.
Claim 6
Dependent Claim
38 words
The AgAg according to claim 3 wherein component (b), the core material, is at least about 80 weight percent of the AgAg, and component (a), the shell material, is less than about 20 weight percent of the AgAg.
Claim 7
Dependent Claim
46 words
The AgAg according to claim 3, wherein component (a), the shell material, is a polymerized mixture of from about 90 to about 95 weight percent of subcomponent (i), the ester monomer, and from about 5 to about 10 weight percent of subcomponent (ii), the acid monomer.
Claim 8
Dependent Claim
30 words
The AgAg according to claim 6 wherein subcomponent (i), the ester monomer, consists essentially of ethyl acrylate (EA) and subcomponent (ii), the acid monomer, consists essentially of methacrylic acid (MAA).
Claim 9
Dependent Claim
36 words
The AgAg according to claim 7 wherein component (b), the core material, consists essentially of the polymerization product of butadiene and one or more of the monomers selected from the group consisting of styrene and acrylonitrile.
Claim 10
Dependent Claim
57 words
A method of agglomerating the particles of a latex of an elastomeric material, said process comprising: (a) maintaining the pH of the latex from about 7 to about 11; (b) treating the latex with an effective amount of an AgAg, which AgAg is defined in claim 2; and (c) allowing the particles of the latex to agglomerate.
Claim 11
Dependent Claim
26 words
The method according to claim 9 wherein the latex of elastomeric material, the particles of which are desired to be agglomerated, is at least 95% polymerized.
Claim 12
Dependent Claim
35 words
The method according to claim 10 wherein from about 0.4 to about 3 weight percent AgAg based on the weight of the elastomeric material to be agglomerated (wt. % based on wt. rubber) is used.
Claim 13
Dependent Claim
35 words
The method according to claim 10 wherein from about 0.5 to about 1.5 weight percent AgAg based on the weight of the elastomeric material to be agglomerated (wt. % based on wt. rubber) is used.
Claim 14
Dependent Claim
43 words
The method according to claim 12 wherein the elastomeric material, the particles of which are desired to be agglomerated consists essentially of the polymerization product of butadiene and one or more of the monomers selected from the group consisting of styrene and acrylonitrile.
Claim 15
Dependent Claim
29 words
The method according to claim 13 wherein component (b) the core material has the same composition as the elastomeric material, the particles of which are desired to be agglomerated.
Claim 16
Dependent Claim
74 words
A method of producing a grafted rubber concentrate (GRC) having included therein at least about 30% by weight elastomeric material which method consists of: (a) agglomerating the particles of a latex of an elastomeric material according to claim 9; (b) adding an effective amount of graftable, polymerizable monomer component; and (c) causing such added monomer to interpolymerize and also causing the grafting of an effective amount of interpolymer onto the particles of elastomeric material.
Claim 17
Dependent Claim
26 words
The method according to claim 15 wherein the latex of elastomeric material, the particles of which are desired to be agglomerated, is at least 95% polymerized.
Claim 18
Dependent Claim
25 words
The method according to claim 16 wherein at least a portion of the graftable, polymerizable monomer component is added while the AgAg is being added.
Claim 19
Dependent Claim
22 words
The method according to claim 16 wherein the elastomeric material is in the form of particles having a polydispersed particle size distribution.
Claim 20
Dependent Claim
19 words
The method according to claim 16 wherein the graftable, polymerizable monomer component is a combination of styrene and acrylonitrile.
Claim 21
Dependent Claim
36 words
A method of producing a rubber-modified polymer composition which method comprises (a) agglomerating the particles of a latex of an elastomeric material according to claim 9; and (b) polymerizing in the presence thereof a monomer mixture.
Claim 22
Dependent Claim
30 words
A method of producing a rubber-modified polymer composition which method comprises combining with a GRC obtained in accordance with claim 18, an additional amount of a rigid polymer compatible therewith.
Claim 23
Dependent Claim
11 words
An elastomeric material agglomerated according to the process of claim 9.
Claim 24
Dependent Claim
11 words
An elastomeric material agglomerated according to the process of claim 11.
Claim 25
Dependent Claim
22 words
A rubber-modified polymer composition comprising a polydispersed particle size elastomer, said composition achieved according to the process of claim 20 or 21.
Claim 26
Dependent Claim
10 words
A GRC produced according to the process of claim 15.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |