US4668738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for promoting syneresis in high rubber ABS latex
Assignee: Dow Chemical Co
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Filing: 1985-12-24
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Granted: 1987-05-26
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Expires: 2005-12-24
Abstract
Abstract A process, and the well-dispersed product thereof, for recovering solids from a latex of a grafted rubber concentrate having a rubber substrate and a glassy superstrate by: (a) adding a latex of said superstrate to said grafted rubber concentrate latex; (b) coagulating said latex with high shear to form a paste; (c) heating said paste to cause syneresis of said paste into polymeric particles; and (d) dewatering said particles.
Inventors
- 👤 John W. Lee
- 👤 Eugene R. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08F; C08F279/00; C08F279/02; C08F279/04; C08F6/00; C08F6/14; C08J3/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
101 words
A process for recovering solids from a first latex comprising a grafted polymer having a rubber substrate and a glassy superstrate, said polymer comprising greater than about 50% rubber substrate, said process comprising the steps of: (A) adding a second latex consists essentially of said superstrate to said first latex to form a blend of said first and second latexes said second latex being added in an amount effective to promote syneresis: (B) coagulating said blend with high shear to form a paste; (C) heating said paste to cause syneresis of said paste into polymeric particles; and (D) dewatering said particles.
Claim 2
Dependent Claim
101 words
A process for recovering solids from a first latex comprising a grafted polymer having a rubber substrate and a glassy superstrate, said polymer comprising greater than about 50% rubber substrate, said process comprising the steps of: (A) adding a second latex consists essentially of said superstrate to said first latex to form a blend of said first and second latexes said second latex being added in an amount effective to promote syneresis: (B) coagulating said blend with high shear to form a paste; (C) heating said paste to cause syneresis of said paste into polymeric particles; and (D) dewatering said particles.
Claim 3
Dependent Claim
60 words
The process of claim 1 wherein said first latex comprises a grafted polymer having a substrate containing a diene moiety and a superstrate of an interpolymer comprising a monovinyl aromatic hydrocarbon and an ethylenically unsaturated nitrile and wherein said second latex also consists essentially of the superstrate of an interpolymer of a monovinyl aromatic hydrocarbon and an ethylenically unsaturated nitrile.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein step (D) is carried out by mechanically dewatering said particles.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein said first latex is unfinishable and said second latex is added in an amount effective to provide finishability to a mixture of said first and second latexes.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said grafted polymer comprises an acrylonitrile-butadiene-styrene polymer.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said superstrate of said second latex consists essentially of a styrene-acrylonitrile copolymer.
Claim 8
Dependent Claim
16 words
The process of claim 2 wherein step (D) is carried out by mechanically dewatering said particles.
Claim 9
Dependent Claim
33 words
The process of claim 7 wherein said first latex is unfinishable and said second latex is added in an amount effective to provide finishability to a mixture of said first and second latexes.
Claim 10
Dependent Claim
12 words
The process of claim 8 wherein said grafted polymer comprises acrylonitrile-butadiene-styrene polymer.
Claim 11
Dependent Claim
18 words
The process of claim 9 wherein said superstrate of said second latex consists essentially of a styrene-acrylonitrile copolymer.
Claim 12
Dependent Claim
79 words
A process for recovering solids from an unfinishable latex of acrylonitrile-butadiene-styrene graft polymer, said graft polymer comprising greater than about 50% butadiene, said process comprising the steps of: (A) adding an emulsion of a copolymer of acrylonitrile and styrene to said latex in an amount effective to promote syneresis; (B) coagulating the product of step (a) with high shear to form a paste; (C) subjecting said paste to syneresis to form a crumb; and (D) mechanically dewatering said crumb.
Claim 13
Dependent Claim
79 words
A process for recovering solids from an unfinishable latex of acrylonitrile-butadiene-styrene graft polymer, said graft polymer comprising greater than about 50% butadiene, said process comprising the steps of: (A) adding an emulsion of a copolymer of acrylonitrile and styrene to said latex in an amount effective to promote syneresis; (B) coagulating the product of step (a) with high shear to form a paste; (C) subjecting said paste to syneresis to form a crumb; and (D) mechanically dewatering said crumb.
Claim 14
Dependent Claim
11 words
A product made in accordance with the process of claim 1.
Claim 15
Dependent Claim
11 words
A product made in accordance with the process of claim 11.
Claim 16
Dependent Claim
28 words
A formed product from a product made in accordance with the process of claim 1, then dry blended and thermoformed into a useful formed article without intermediate compounding.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |