Patent US4774271A successfully refreshed from Google Patents.
US4774271A
Expired / Lapsed
US
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Processing of polymer dispersions by spray drying
Assignee: Bayer AG
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Filing: 1987-02-09
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Granted: 1988-09-27
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Expires: 2007-02-09
Abstract
Abstract The invention relates to a process for the recovery of thermoplastic polymers from aqueous dispersions by spray-drying after treatment with carboxylic acid of formula I ##STR1## wherein X is a single bond, --CH 2 -- or --C 2 H 4 --, and R is --H, --OH or ##STR2##
Inventors
- 👤 Christian Lindner
- 👤 Pol Bamelis
- 👤 Jurgen Hinz
- 👤 Dieter Wittmann
- 👤 Otto Koch
- 👤 Burkhard Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:31
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08F; C08F6/00; C08F6/14; C08F8/00; C08J; C08J3/00; C08J3/12; C08J3/122; C08K5/04; C08K5/09; C08K5/092; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A process for the processing of a thermoplastic graft co-polymer of olefinically unsaturated monomers grafted onto a rubber by spray-drying, in which a dispersion of a thermoplastic graft polymer is treated with at least one carboxylic acid of the general formula ##STR5## in which X denotes a single bond, --CH 2 -- or --C 2 H 4 --, and R denotes --H, OH or OH ##STR6## said dispersion prepared by means of a mixture of an alkali metal salt of a carboxylic acid and an alkali metal salt of an organic sulphonic acid as emulsifier, and the pH of the dispersion being adjusted, if required, to a value less than 7, the resulting dispersion is then subjected to spray-drying and the thermoplastic graft co-polymer, is recovered in powder form.
Claim 2
Dependent Claim
129 words
A process for the processing of a thermoplastic graft co-polymer of olefinically unsaturated monomers grafted onto a rubber by spray-drying, in which a dispersion of a thermoplastic graft polymer is treated with at least one carboxylic acid of the general formula ##STR5## in which X denotes a single bond, --CH 2 -- or --C 2 H 4 --, and R denotes --H, OH or OH ##STR6## said dispersion prepared by means of a mixture of an alkali metal salt of a carboxylic acid and an alkali metal salt of an organic sulphonic acid as emulsifier, and the pH of the dispersion being adjusted, if required, to a value less than 7, the resulting dispersion is then subjected to spray-drying and the thermoplastic graft co-polymer, is recovered in powder form.
Claim 3
Dependent Claim
60 words
A process according to claim 1 wherein olefinically unsaturated monomers are styrenes, alpha-methyl styrenes, acrylonitrile, methacrylonitrile, alkyl methacrylates having 1 to 8 carbon atoms in the alkyl group, alkyl acrylates having 1 to 8 carbon atoms in the alkyl group, vinyl chloride, vinyl acetate and vinylidene chloride, and the rubber is a diene rubber, alkyl acrylate rubber or olefin rubber.
Claim 4
Dependent Claim
24 words
A process according to claim 1, in which the carboxylic acid of formula (I) is a propanetricarboxylic acid, a butanetricarboxylic acid or citric acid.
Claim 5
Dependent Claim
17 words
A process according to claim 1, in which the carboxylic acid of formula (I) is 2-phosphono-1,2,4-butanetricarboxylic acid.
Claim 6
Dependent Claim
19 words
A process according to claim 1, in which the pH of the dispersion is adjusted to 3 to 4.
Claim 7
Dependent Claim
10 words
A polymer whenever produced by the process of claim 1.
Claim 8
Dependent Claim
11 words
A thermoplastic moulding material containing a polymer according to claim 6.
Claim 9
Dependent Claim
17 words
A process according to claim 3 in which the pH of the dispersion is adjusted to 3-4.
Claim 10
Dependent Claim
17 words
A process according to claim 4 in which the pH of the dispersion is adjusted to 3-4.
References Cited (Backward Citations)
US4133947A
Cited
US4263426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |