US4528315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polymer dispersions and their application
Assignee: Wacker Chemie AG
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Filing: 1983-06-09
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Granted: 1985-07-09
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Expires: 2003-06-09
Abstract
Abstract A process for the preparation of aqueous dispersions, also emulsion (co)polymerization of vinyl halides and/or vinyl esters and, if needed, additional monomers in the absence of emulsifying agents are described. Protective colloid is added after the initiation of the polymerization to stabilize the forming dispersion. The dispersions are characterized by low viscosity, even with high solids contents, and low structural viscosity, and they are suitable a.o. especially for the preparation of redispersible powders.
Inventors
- 👤 Herbert Eck
- 👤 Manfred Hannebaum
- 👤 Christof Kemenater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:34
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08F2/20
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
136 words
In a process for the preparation of aqueous polymer dispersions with solids contents of 20 to 75 wt%., calculated with respect to the total weight, which are stabilized by a protective colloid, by single-step polymerization of vinyl halides and/or vinyl alkanoates, together with 0 to 50 wt%., calculated with respect to the total weight of the monomers that are liquid under the reaction conditions, of other copolymerizable compounds containing unsaturated ethylene bonds, at temperatures of 0° to 120° C. and pressure of up to 200 bar, with the aid of at least partly water-soluble radical initiator systems, the improvement comprising the metering of protective colloid as first dispersing agent begins only after a conversion of 1 to 60 wt%., calculated with respect to the total weight of the monomers that are liquid under the reaction conditions.
Claim 2
Dependent Claim
136 words
In a process for the preparation of aqueous polymer dispersions with solids contents of 20 to 75 wt%., calculated with respect to the total weight, which are stabilized by a protective colloid, by single-step polymerization of vinyl halides and/or vinyl alkanoates, together with 0 to 50 wt%., calculated with respect to the total weight of the monomers that are liquid under the reaction conditions, of other copolymerizable compounds containing unsaturated ethylene bonds, at temperatures of 0° to 120° C. and pressure of up to 200 bar, with the aid of at least partly water-soluble radical initiator systems, the improvement comprising the metering of protective colloid as first dispersing agent begins only after a conversion of 1 to 60 wt%., calculated with respect to the total weight of the monomers that are liquid under the reaction conditions.
Claim 3
Dependent Claim
40 words
Process according to claim 1, characterized by the fact that at least one polyvinyl alcohol with a degree of hydrolysis of 70 to 99.8 mol% and a mean degree of polymerization of 200 to 3,000 is used as protective colloid.
Claim 4
Dependent Claim
34 words
Process according to claim 1, characterized by the fact that protective colloid is used in amounts of 0.5 to 15 wt%, calculated with respect to the monomers that are liquid under the reaction conditions.
Claim 5
Dependent Claim
39 words
Process according to claim 1, characterized by the fact that 1 to 40 wt% of the monomers that are liquid under the reaction conditions are initially placed in the reaction vessel and that the rest is added by metering.
Claim 6
Dependent Claim
28 words
Process according to claim 1, chaaracterized by the fact that not more than 20 wt% of additional comonomers that are liquid under the reaction conditions are also used.
Claim 7
Dependent Claim
26 words
Process according to claim 1, characterized by the fact that ethylene is used in addition as comonomer, preferably at partial pressures of up to 80 bar.
Claim 8
Dependent Claim
34 words
Process according to claim 2, characterized by the fact that protective colloid is used in amounts of 0.5 to 15 wt%, calculated with respect to the monomers that are liquid under the reaction conditions.
Claim 9
Dependent Claim
39 words
Process according to claim 2, characterized by the fact that 1 to 40 wt% of the monomers that are liquid under the reaction conditions are initially placed in the reaction vessel and that the rest is added by metering.
Claim 10
Dependent Claim
39 words
Process according to claim 3, characterized by the fact that 1 to 40 wt% of the monomers that are liquid under the reaction conditions are initially placed in the reaction vessel and that the rest is added by metering.
Claim 11
Dependent Claim
28 words
Process according to claim 2, characterized by the fact that not more than 20 wt% of additional comonomers that are liquid under the reaction conditions are also used.
Claim 12
Dependent Claim
28 words
Process according to claim 3, characterized by the fact that not more than 20 wt% of additional comonomers that are liquid under the reaction conditions are also used.
Claim 13
Dependent Claim
28 words
Process according to claim 4, characterized by the fact that not more than 20 wt% of additional comonomers that are liquid under the reaction conditions are also used.
Claim 14
Dependent Claim
26 words
Process according to claim 2, characterized by the fact that ethylene is used in addition as comonomer, preferably at partial pressures of up to 80 bar.
Claim 15
Dependent Claim
26 words
Process according to claim 3, characterized by the fact that ethylene is used in addition as comonomer, preferably at partial pressures of up to 80 bar.
Claim 16
Dependent Claim
26 words
Process according to claim 4, characterized by the fact that ethylene is used in addition as comonomer, preferably at partial pressures of up to 80 bar.
Claim 17
Dependent Claim
26 words
Process according to claim 5, characterized by the fact that ethylene is used in addition as comonomer, preferably at partial pressures of up to 80 bar.
Claim 18
Dependent Claim
14 words
An adhesive containing an aqueous polymer dispersion prepared by the process of claim 1.
Claim 19
Dependent Claim
11 words
The process of claim 1 wherein the dispersions contain conventional additives.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |