US4206293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing ABS type resin
Assignee: Bayer Antwerpen NV
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Filing: 1978-07-14
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Granted: 1980-06-03
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Expires: 1998-07-14
Abstract
Abstract This invention relates to an improved process for preparing ABS resins wherein a alkadiene rubber is grafted in aqueous emulsion with styrene and nitrile type monomers, forming a grafted rubber, extracting said grafted rubber into a monomer phase and separating said monomer-grafted rubber phase from said aqueous phase followed by mass polymerizing said grafted rubber-monomer phase to form an ABS polyblend, wherein the improvement comprises, carrying out the mass polymerization of said monomers in the presence of sufficient carbon dioxide to provide an ABS resin having a substantially white color.
Inventors
- 👤 Robert L. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:48
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F279/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
248 words
An improved process for production of ABS resins wherein particles of an alkadiene rubber grafted with monovinylidene aromatic and alkenenitrile monomers are dispersed in a matrix copolymer of a monovinylidene aromatic monomer and an alkenenitrile monomer which comprises: a. grafting by aqueous emulsion graft polymerization an alkadiene rubber with a monovinylidene aromatic monomer and an alkenenitrile monomer to produce grafted rubber particles in an aqueous latex, b. mixing with said latex from 30 to 400 parts per hundred parts of latex solids by weight of at least one monoethylenically unsaturated monomer selected from the group consisting of monovinylidene aromatic monomers and alkenenitrile monomers, c. extracting said grafted rubber latex particles from said aqueous latex into the monomer forming a dispersion of said particles in the monomer phase, said aqueous latex forming a separate free water phase, d. separating said free water phase from said monomer phase, e. subjecting said grafted rubber particles dispersed in said monomer phase to mass polymerization conditions to produce an ABS resin composition comprising said alkadiene grafted rubber particles dispersed in said matrix copolymer and unreacted monomers as a melt, and f. devolatilizing said ABS resin composition melt so as to remove said unreacted monomers providing an ABS resin product comprising said matrix copolymer having said grafted rubber particles dispersed therein, the improvement comprising carrying out the mass polymerization of said monomer phase in step (e) in the presence of sufficient carbon dioxide to provide an ABS resin product having a substantially white color.
Claim 2
Dependent Claim
248 words
An improved process for production of ABS resins wherein particles of an alkadiene rubber grafted with monovinylidene aromatic and alkenenitrile monomers are dispersed in a matrix copolymer of a monovinylidene aromatic monomer and an alkenenitrile monomer which comprises: a. grafting by aqueous emulsion graft polymerization an alkadiene rubber with a monovinylidene aromatic monomer and an alkenenitrile monomer to produce grafted rubber particles in an aqueous latex, b. mixing with said latex from 30 to 400 parts per hundred parts of latex solids by weight of at least one monoethylenically unsaturated monomer selected from the group consisting of monovinylidene aromatic monomers and alkenenitrile monomers, c. extracting said grafted rubber latex particles from said aqueous latex into the monomer forming a dispersion of said particles in the monomer phase, said aqueous latex forming a separate free water phase, d. separating said free water phase from said monomer phase, e. subjecting said grafted rubber particles dispersed in said monomer phase to mass polymerization conditions to produce an ABS resin composition comprising said alkadiene grafted rubber particles dispersed in said matrix copolymer and unreacted monomers as a melt, and f. devolatilizing said ABS resin composition melt so as to remove said unreacted monomers providing an ABS resin product comprising said matrix copolymer having said grafted rubber particles dispersed therein, the improvement comprising carrying out the mass polymerization of said monomer phase in step (e) in the presence of sufficient carbon dioxide to provide an ABS resin product having a substantially white color.
Claim 3
Dependent Claim
23 words
A process of claim 1 wherein said monovinylidene aromatic monomer is selected from the group consisting of styrene, alphamethyl styrene, chlorostyrene and bromostyrene.
Claim 4
Dependent Claim
19 words
A process of claim 1 wherein said alkenenitrile monomer is selected from the group consisting of acrylinitrile and methacrylonitrile.
Claim 5
Dependent Claim
33 words
A process of claim 1 wherein said monoethylenically saturated monomers used in step (b) are a mixture of styrene and acrylonitrile, said mixture containing not more than about 50% by weight of styrene.
Claim 6
Dependent Claim
14 words
A process of claim 1 wherein said monomer used in step (b) is styrene.
Claim 7
Dependent Claim
14 words
A process of claim 1 wherein said monomer used in step (b) is acrylonitrile.
Claim 8
Dependent Claim
37 words
A process of claim 1 wherein said monomer phase is adjusted in step (e) with additional monoethylenically unsaturated monomer such that the weight ratio of monoethylenically unsaturated aromatic to alkenyl nitrile monomer is about 80:20 to 20:80.
Claim 9
Dependent Claim
55 words
A process of claim 7 wherein said monomer phases is adjusted in step (e) with said aromatic and nitrile monomers such that the rubber moiety of the dispersed rubber particles is present in the ABS resin product formed in step (f) in an amount of 3 to 50% by weight of said ABS resin product.
Claim 10
Dependent Claim
19 words
A process of claim 1 wherein said monomer phase is saturated with carbon dioxide under the conditions of polymerization.
Claim 11
Dependent Claim
24 words
A process of claim 9 wherein said mass polymerization is carried out at 130° to 200° C. at pressures of 40 to 100 psi.
Claim 12
Dependent Claim
31 words
A process of claim 10 wherein said mass polymerization is carried out under continuous mass polymerization conditions in a horizontal stirred flow through reaction being cooled by evaporation of said monomers.
Claim 13
Dependent Claim
18 words
A process of claim 1 wherein said grafted rubber latex is coagulated prior to extraction into said monomer.
Claim 14
Dependent Claim
32 words
A process of claim 12 wherein said coagulation is carried out by mixing said latex with a sufficient amount of a coagulant selected from the group consisting of acids, salts and polyelectrolytes.
Claim 15
Dependent Claim
16 words
A process of claim 13 wherein said salt is aluminum sulfate, sodium chloride or magnesium sulfate.
Claim 16
Dependent Claim
30 words
A process of claim 1 wherein said monomers used in step (b) contain at least one saturated solvent for a graft copolymers of said monovinylidene aromatic and alkenyl nitrile monomers.
Claim 17
Dependent Claim
38 words
A process of claim 15 wherein said solvent has a boiling point between 25° to 250° C. as is present in said monomers in an amount of about 10 to 40% by weight of said monomers and solvent.
Claim 18
Dependent Claim
27 words
A process of claim 16 wherein said solvent is selected from the group consisting of nitriles, hydrocarbons, halogenated hydrocarbons, lower carboxylic esters, cyclic ethers, formamides and acetamides.
Claim 19
Dependent Claim
10 words
A process of claim 17 wherein said solvent is propionitrile.
Claim 20
Dependent Claim
11 words
A process of claim 15 wherein the graft copolymer is styrene-acrylonitrile.
Claim 21
Dependent Claim
180 words
An improved process for production of ABS resins wherein particles of an alkadiene rubber grafted with monovinylidene aromatic and alkenenitrile monomers are dispersed in a matrix copolymer of a monovinylidene aromatic monomer and an alkenenitrile monomer which comprises: a. grafting by aqueous emulsion graft polymerization an alkadiene rubber with styrene and acrylonitrile to produce grafted rubber particles in an aqueous latex, b. mixing said latex with about 40 to 400 parts of at least one monomer selected from the group consisting of styrene and acrylonitrile, c. extracting said graft rubber particles from said latex into said monomer forming a dispersion of said particles in said monomer as a monomer phase, said aqueous latex forming a free water phase, d. separating said free water phase from said monomer phase, e. subjecting said monomer phase to mass polymerization conditions to produce an ABS resin, and f. devolatilizing said ABS resin so as to remove residual monomer, said improvement comprising, carrying out such mass polymerization in the presence of sufficient carbon dioxide to provide an ABS resin product having a substantially white color.
Claim 22
Dependent Claim
180 words
An improved process for production of ABS resins wherein particles of an alkadiene rubber grafted with monovinylidene aromatic and alkenenitrile monomers are dispersed in a matrix copolymer of a monovinylidene aromatic monomer and an alkenenitrile monomer which comprises: a. grafting by aqueous emulsion graft polymerization an alkadiene rubber with styrene and acrylonitrile to produce grafted rubber particles in an aqueous latex, b. mixing said latex with about 40 to 400 parts of at least one monomer selected from the group consisting of styrene and acrylonitrile, c. extracting said graft rubber particles from said latex into said monomer forming a dispersion of said particles in said monomer as a monomer phase, said aqueous latex forming a free water phase, d. separating said free water phase from said monomer phase, e. subjecting said monomer phase to mass polymerization conditions to produce an ABS resin, and f. devolatilizing said ABS resin so as to remove residual monomer, said improvement comprising, carrying out such mass polymerization in the presence of sufficient carbon dioxide to provide an ABS resin product having a substantially white color.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |