US4456726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making aqueous dispersions of a synthetic resin
Assignee: Roehm GmbH Darmstadt
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Filing: 1982-10-18
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Granted: 1984-06-26
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Expires: 2002-10-18
Abstract
Abstract What is disclosed is making highly concentrated, bimodal, aqueous synthetic resin dispersions by the emulsion polymerization of ethylenically unsaturated monomers, in the presence of emulsifiers and free radical-forming initiators, by adding to a first latex containing a first dispersed synthetic resin and an aqueous phase, a second latex containing a second dispersed synthetic resin and an aqueous phase and a monomer phase containing a free-radically polymerizable monomer, and then polymerizing the monomer, the average size of the particles of said first resin differing by a factor between 2 and 15 from that of the particles of second resin, the total weight of the resins and monomers representing 100 parts by weight, and the total weight of the aqueous phases representing not more than 70 parts by weight.
Inventors
- 👤 Werner Siol
- 👤 Herbert Fink
- 👤 Wolfgang Klesse
- 👤 Hubert Rauch
- 👤 Norbert Suetterlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; C08F291/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A method for making an aqueous, highly concentrated, bimodal, synthetic resin dispersion, which method comprises adding, to a first aqueous dispersion of particles of a first synthetic resin, a second aqueous dispersion of particles of a second synthetic resin and a monomer phase comprising at least one free radically polymerizable unsaturated monomer, at least one such monomer being sparingly soluble in water, and then polymerizing said monomer phase in the presence of an emulsifier and of a water soluble free radical forming initiator, the average size of said particles of said first synthetic resin differing by a factor between 2 and 15 from the average size of said particles of said second synthetic resin, the total weight of said first and second synthetic resin and of said monomer representing 100 parts by weight and the total weight of water present as the aqueous phase of said bimodal resin dispersion representing not more than 70 parts by weight.
Claim 2
Independent Claim
157 words
A method for making an aqueous, highly concentrated, bimodal, synthetic resin dispersion, which method comprises adding, to a first aqueous dispersion of particles of a first synthetic resin, a second aqueous dispersion of particles of a second synthetic resin and a monomer phase comprising at least one free radically polymerizable unsaturated monomer, at least one such monomer being sparingly soluble in water, and then polymerizing said monomer phase in the presence of an emulsifier and of a water soluble free radical forming initiator, the average size of said particles of said first synthetic resin differing by a factor between 2 and 15 from the average size of said particles of said second synthetic resin, the total weight of said first and second synthetic resin and of said monomer representing 100 parts by weight and the total weight of water present as the aqueous phase of said bimodal resin dispersion representing not more than 70 parts by weight.
Claim 3
Dependent Claim
44 words
A method as in claim 1 wherein the weight of the particles present either in said first or in said second aqueous dispersions, whichever has the larger particles, is at least 60 percent of the total weight of said first and second synthetic resins.
Claim 4
Dependent Claim
16 words
A method as in claim 1 wherein said monomer phase additionally contains a water soluble emulsifier.
Claim 5
Dependent Claim
17 words
A method as in claim 3 wherein said monomer phase additionally contains a small amount of water.
Claim 6
Dependent Claim
30 words
A method as in claim 1 wherein the total weight of water present as the aqueous phase of said bimodal resin dispersion represents not more than 60 parts by weight.
Claim 7
Dependent Claim
30 words
A method as in claim 1 wherein the total weight of water present as the aqueous phase of said bimodal resin dispersion represents not more than 50 parts by weight.
Claim 8
Dependent Claim
30 words
A method as in claim 1 wherein said monomer phase, comprising at least 90 percent by weight of monomers, is gradually fed into said first aqueous dispersion under polymerizing conditions.
Claim 9
Dependent Claim
26 words
A method as in claim 1 wherein said monomers are added to a mixture of said first and second aqueous dispersions in one or more portions.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |