US4254004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion process for polymer particles
Assignee: Akzo Nobel Paints LLC
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Filing: 1979-05-09
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Granted: 1981-03-03
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Expires: 1999-05-09
Abstract
Abstract An improved two-step process for producing bimodal emulsion polymer particles includes the steps of first providing uniform size polymer particles in the first stage by feeding monomers to the reaction mixture at a rate faster than the rate the monomers polymerize, and followed by a controlled second stage monomer polymerization by feeding monomers to the reaction mixture at a rate slower than the rate of polymerization of the monomers. The polymer particles are bimodal and are particularly useful in coatings, adhesives, and plastics.
Inventors
- 👤 Kirk J. Abbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:45
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
In an emulsion process for polymerizing ethylenically unsaturated monomers in an aqueous reaction medium to provide stabilized latex polymer particles having an average number weight particle size between about 0.05 and 1 micron, the improvement comprising: polymerizing an initial charge of said monomers of between 2% and 20% by weight of the total monomers in said aqueous reaction medium to provide pre-reacted polymer seed particles; reacting a first monomer feed of between about 10% and 40% by weight of the total monomers by feeding said first monomers to the aqueous reaction medium at a feed rate faster than the monomer polymerization rate of said first monomers until the onset of the Trommsdorff gel exotherm effect; reacting the remaining weight of said total monomers by feeding said remaining monomers to the aqueous reaction mixture at a feed rate slower than the polymerization rate of said monomers to provide a bimodal in-situ blend of polymer particles wherein the larger modal of polymer particles is between about 1.1 and 6 times the size of the smaller modal of polymer particles.
Claim 2
Dependent Claim
177 words
In an emulsion process for polymerizing ethylenically unsaturated monomers in an aqueous reaction medium to provide stabilized latex polymer particles having an average number weight particle size between about 0.05 and 1 micron, the improvement comprising: polymerizing an initial charge of said monomers of between 2% and 20% by weight of the total monomers in said aqueous reaction medium to provide pre-reacted polymer seed particles; reacting a first monomer feed of between about 10% and 40% by weight of the total monomers by feeding said first monomers to the aqueous reaction medium at a feed rate faster than the monomer polymerization rate of said first monomers until the onset of the Trommsdorff gel exotherm effect; reacting the remaining weight of said total monomers by feeding said remaining monomers to the aqueous reaction mixture at a feed rate slower than the polymerization rate of said monomers to provide a bimodal in-situ blend of polymer particles wherein the larger modal of polymer particles is between about 1.1 and 6 times the size of the smaller modal of polymer particles.
Claim 3
Dependent Claim
26 words
The process in claim 1 wherein the in-situ bimodal blend comrises larger modal particles between about 1.5 and 3 times larger than the smaller modal particles.
Claim 4
Dependent Claim
16 words
The process in claim 1 wherein one of the modals of polymer particles is essentially monodispersed.
Claim 5
Dependent Claim
24 words
The process in claim 1 wherein both the larger modal and the smaller modal of the bimodal blend are monodispersed modals of polymer particles.
References Cited (Backward Citations)
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |