US4141932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined emulsion and suspension process for producing graft ABS bead-like particles
Assignee: GE Chemicals Inc
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Filing: 1977-10-03
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Granted: 1979-02-27
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Expires: 1997-10-03
Abstract
Abstract A method of preparing a graft ABS polymer comprising first preparing a rubbery graft ABS polymer by emulsion polymerizing acrylonitrile and styrene in the presence of a rubber, coagulating the emulsion and then polymerizing a mixture of acrylonitrile and styrene in the presence of the coagulant and an organic or inorganic suspending agent to form bead-like particles of ABS.
Inventors
- 👤 James M. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:47
CPC Classifications
C; C08; C08F; C08F285/00; C08F279/00; C08F279/02; C08F279/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A method of preparing an ABS polymer which comprises (1) polymerizing a vinyl aromatic hydrocarbon and an alkenyl cyanide in the presence of a diene rubber present in the form of an aqueous emulsion to form a graft ABS polymer emulsion latex; (2) completely coagulating the graft ABS polymer emulsion latex with a coagulant to form a slurry; (3) adding a vinyl aromatic hydrocarbon, an alkenyl cyanide and a suspending agent to said slurry; (4) heating said slurry to polymerize said added vinyl aromatic hydrocarbon and alkenyl cyanide in the presence of said graft ABS polymer; and (5) recovering the thus produced ABS polymer in bead-like form.
Claim 2
Independent Claim
107 words
A method of preparing an ABS polymer which comprises (1) polymerizing a vinyl aromatic hydrocarbon and an alkenyl cyanide in the presence of a diene rubber present in the form of an aqueous emulsion to form a graft ABS polymer emulsion latex; (2) completely coagulating the graft ABS polymer emulsion latex with a coagulant to form a slurry; (3) adding a vinyl aromatic hydrocarbon, an alkenyl cyanide and a suspending agent to said slurry; (4) heating said slurry to polymerize said added vinyl aromatic hydrocarbon and alkenyl cyanide in the presence of said graft ABS polymer; and (5) recovering the thus produced ABS polymer in bead-like form.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1 wherein the vinyl aromatic hydrocarbon and the alkenyl cyanide of Steps 1 and 3 are styrene and acrylonitrile, respectively.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1 wherein the suspending agent is calcium phosphate.
Claim 5
Dependent Claim
20 words
A method in accordance with claim 1 wherein calcium chloride is the coagulant and calcium phosphate is the suspending agent.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 1 wherein calcium chloride is the coagulant and polyvinyl alcohol is the suspending agent.
Claim 7
Dependent Claim
16 words
A method in accordance with claim 1 wherein the diene rubber of Step 1 is polybutadiene.
Claim 8
Dependent Claim
18 words
A method in accordance with claim 1 wherein the diene rubber is a copolymer of butadiene and styrene.
Claim 9
Dependent Claim
18 words
A method in accordance with claim 1 wherein the diene rubber is a copolymer of butadiene and acrylonitrile.
Claim 10
Dependent Claim
51 words
A method in accordance with claim 1 wherein the vinyl aromatic hydrocarbonand the alkenyl cyanide of Steps 1 and 3 are styrene and acrylonitrile, respectively, the diene rubber of Step 1 is polybutadiene, the coagulant of Step 2 is calcium chloride and the suspending agent of Step 3 is calcium phosphate.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |