US3855355A
Expired / Lapsed
US
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Process for preparing graft copolymers in aqueous emulsion
Assignee: International Synthetic Rubber Co Ltd
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Filing: 1972-05-11
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Granted: 1974-12-17
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Expires: 1992-05-11
Abstract
Abstract In the preparation of ABS from a rubbery polybutadiene latex improved physical properties, in particular, improved impact strenght, are obtained by: 1. ADMIXING SOME OR ALL OF THE STYRENE TO BE GRAFTED WITH THE LATEX IN THE ABSENCE OF ACRYLONITRILE 2. CONTACTING THE MIXTURE SO FORMED, AFTER AN IMBIBING TIME OF FROM 5 MINUTES TO 20 HOURS, WITH ACRYLONITRILE AND THE BALANCE, IF ANY, OF THE STYRENE, AND 3. GRAFTING THE STYRENE AND ACRYLONITRILE ONTO THE POLYBUTADIENE. The process is particularly applicable to a latex having a number average particle diameter of at least 1,500A, a weight average particle diameter of 2500-3000 A, a gel content of 60 to 90 percent and swelling index to 10 to 30. Such a latex may be obtained by the process of U.S. Patent application No. of Bennett and Duck entitled ''''LATEX PREPARATION'''' filed May 5, 1972.
Inventors
- 👤 J Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:30
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F279/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
19 words
A PROCESS FOR PREPARING AN ACRYLONITRILE-BUTADIENESTYRENE (ABS) GRAFT COPOLYMER FROM A RUBBERY POLYBUTADIENE LATEX CHARACTERIZED BY THE STEPS OF:
Claim 2
Dependent Claim
19 words
A PROCESS FOR PREPARING AN ACRYLONITRILE-BUTADIENESTYRENE (ABS) GRAFT COPOLYMER FROM A RUBBERY POLYBUTADIENE LATEX CHARACTERIZED BY THE STEPS OF:
Claim 3
Dependent Claim
33 words
ADMIXING SOME OR ALL OF THE STYRENE TO BE GRAFTED, WITH THE LATEX IN THE ABSENCE OF ACRYLONITRILE, THE AMOUNT OF STYRENE BEING AT LEAST 30 PARTS BY WEIGHT PER 100 PARTS OF
Claim 4
Dependent Claim
33 words
ADMIXING SOME OR ALL OF THE STYRENE TO BE GRAFTED, WITH THE LATEX IN THE ABSENCE OF ACRYLONITRILE, THE AMOUNT OF STYRENE BEING AT LEAST 30 PARTS BY WEIGHT PER 100 PARTS OF
Claim 5
Dependent Claim
31 words
CONTACTING THE MIXTURE SO FORMED AFTER AN IMBIBING TIME OF FROM 5 MINUTES TO 20 HOURS BEFORE REACTION IS INITIATED WITH ACRYLONITRILE AND THE BALANCE. IF ANY, OF THE STYRENE, AND
Claim 6
Dependent Claim
31 words
CONTACTING THE MIXTURE SO FORMED AFTER AN IMBIBING TIME OF FROM 5 MINUTES TO 20 HOURS BEFORE REACTION IS INITIATED WITH ACRYLONITRILE AND THE BALANCE. IF ANY, OF THE STYRENE, AND
Claim 7
Dependent Claim
31 words
contacting the mixture so formed after an imbibing time of from 5 minutes to 20 hours before reaction is initiated with acrylonitrile and the balance, if any, of the styrene, and
Claim 8
Dependent Claim
31 words
contacting the mixture so formed after an imbibing time of from 5 minutes to 20 hours before reaction is initiated with acrylonitrile and the balance, if any, of the styrene, and
Claim 9
Dependent Claim
27 words
A process according to claim 1 characterised in that the total amount of styrene used does not exceed 300 parts by weight per hundred parts of polybutadiene.
Claim 10
Dependent Claim
32 words
A process according to claim 1 characterised in that the amount of styrene admixed in step (1) of the process is 30 to 100 parts by weight per hundred parts of polybutadiene.
Claim 11
Dependent Claim
35 words
THEN INITIATING AND CONTINUING AQUEOUS EMULSION GRAFT POLYMERIZATION OF THE STYRENE AND ACRYLONITRILE IN SAID MIXTURE ON TO THE POLYBUTADIENE STEPS (1) AND (2) TAKING PLACE BEFORE THE INITIATION OF GRAFT POLYMERIZATION IN STEP (3).
Claim 12
Dependent Claim
35 words
THEN INITIATING AND CONTINUING AQUEOUS EMULSION GRAFT POLYMERIZATION OF THE STYRENE AND ACRYLONITRILE IN SAID MIXTURE ON TO THE POLYBUTADIENE STEPS (1) AND (2) TAKING PLACE BEFORE THE INITIATION OF GRAFT POLYMERIZATION IN STEP (3).
Claim 13
Dependent Claim
35 words
then initiating and continuing aqueous emulsion graft polymerization of the styrene and acrylonitrile in said mixture on to the polybutadiene steps (1) and (2) taking place before the initiation of graft polymerization in step (3).
Claim 14
Dependent Claim
35 words
then initiating and continuing aqueous emulsion graft polymerization of the styrene and acrylonitrile in said mixture on to the polybutadiene steps (1) and (2) taking place before the initiation of graft polymerization in step (3).
Claim 15
Dependent Claim
23 words
A process according to claim 3 characterised in that the imbibing time in step (2) of the process is 1 to 5 hours.
Claim 16
Dependent Claim
32 words
A process according to claim 1 characterised in that the amount of styrene admixed in step (1) of the process is 100 to 300 parts by weight per hundred parts of polybutadiene.
Claim 17
Dependent Claim
23 words
A process according to claim 5 characterised i that the imbibing time in step (2) of the process is 5 to 40 minutes.
Claim 18
Dependent Claim
25 words
A process according to claim 1 characterised in that the amount of acrylonitrile does not exceed 200 parts by weight per hundred parts of polybutadiene.
Claim 19
Dependent Claim
24 words
A process according to claim 1 characterised in that during the imbibing time, the mixture is maintained at a temperature of 40* to 80*C.
Claim 20
Dependent Claim
33 words
A process according to claim 5 wherein the graft copolymer product oF step (3) is thermoplastic and contains 5 to 40% polybutadiene, 40 to 80 percent styrene and 15 to 25 percent acrylonitrile.
Claim 21
Dependent Claim
49 words
A process according to claim 1 wherein the graft copolymer product of step (3) is rubbery and contains 40 to 60 parts by weight of polybutadiene grafted with 60 to 40 parts by weight of acrylonitrile and styrene, the ratio of styrene to acrylonitrile being from 4:1 to 1:1.
Claim 22
Dependent Claim
19 words
A process according to claim 1 wherein the grafting is accomplished in an emulsion employing a free radical initiator.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |