EP0203724A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing polymeric particles
Assignee: Rohm and Haas Co
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Filing: 1986-04-28
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Granted: —
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Expires: 2006-04-28
Abstract
Abstract @ The present invention concerns a process for preparing an aqueous dispersion of water-soluble core/shell particles by emulsifiying a mixture comprising at least one hydrophobic solvent and/or organic target material, at least one hydrophobic solvent, 3, 4, 5 and 6. The emulsified mixture is heated to polymerise the initial monomer, and then at least one base selected from ammonia and the organic amines is added to neutralise the polymerised carboxylic acid to form core/shell particles. Optionally, additional monomer is added whereby said addition monomer is polymerised on or in the previously found shell of said core/shell polymer. Compositions comprising said core/shell particles are useful as or in coating composition, herbicidal compositions or biocidal compositions.
Inventors
- 👤 George Harvey Redlich
- 👤 Ronald William Novak
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 13:58
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; A; A01; A01N; A01N25/00; A01N25/26; A01N25/28; C08F285/00; C08F291/00; C08F8/00; C08F8/30; C08F8/32; C08F8/44; C08J3/126; C09; C09D; C09D5/00; C09D5/02; C09D5/024; C09D5/028; C09D7/00; C09D7/40; C09D7/45; C09D7/65; C09D7/70; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12; Y; Y10; Y10S; Y10S525/00; Y10S525/902; Y10S525/911; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
170 words
A process for preparing an aqueous dispersion of water-insoluble core/shell particles comprising (a) preparing core emulsion by emulsifying in water at high shear a mixture comprising (1) at least one hydrophobic solvent and/or organic target material, (2) at least one hydrophilic solvent, (3) initial monomer comprising at least two polymerizable mono-ethylenically unsaturated compounds wherein said initial monomer includes from 2 to 4 percent by weight, based on total weight of said initial monomer, of alpha, beta-ethylenically unsaturated carboxylic acid monomer, (4) anionic surfactant, (5) water-insoluble emulsion stabilizer, and (6) water-insoluble thermal polymerization initiator, wherein said hydrophobic solvent and said hydrophilic solvent are non-solvents for polymer prepared by polymerizing said initial monomer, (b) heating said core emulsion to polymerize said initial monomer, thereby forming core particles, (c) adding at least one base selected from ammonia and the organic amines thereby neutralizing polymerized carboxylic acid and forming core/shell particles, and optionally (d) adding additional monomer whereby said additional monomer is polymerized on or in the previously formed shell of said core/shell particles.
Claim 2
Dependent Claim
170 words
A process for preparing an aqueous dispersion of water-insoluble core/shell particles comprising (a) preparing core emulsion by emulsifying in water at high shear a mixture comprising (1) at least one hydrophobic solvent and/or organic target material, (2) at least one hydrophilic solvent, (3) initial monomer comprising at least two polymerizable mono-ethylenically unsaturated compounds wherein said initial monomer includes from 2 to 4 percent by weight, based on total weight of said initial monomer, of alpha, beta-ethylenically unsaturated carboxylic acid monomer, (4) anionic surfactant, (5) water-insoluble emulsion stabilizer, and (6) water-insoluble thermal polymerization initiator, wherein said hydrophobic solvent and said hydrophilic solvent are non-solvents for polymer prepared by polymerizing said initial monomer, (b) heating said core emulsion to polymerize said initial monomer, thereby forming core particles, (c) adding at least one base selected from ammonia and the organic amines thereby neutralizing polymerized carboxylic acid and forming core/shell particles, and optionally (d) adding additional monomer whereby said additional monomer is polymerized on or in the previously formed shell of said core/shell particles.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 wherein additional polymerization initiator is added subsequent to neutralization of core particle polymerized carboxylic acid.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 or claim 2, wherein the weight ratio of components 1 and 2 : component 3 of the core emulsion is from 1:0.8 to 1:3.
Claim 5
Dependent Claim
30 words
A process as claimed in any one of the preceding claims, wherein said hydrophobic solvent has a 50% distillation temperature of from 150°C to 200°C, preferably from 160°C to 180°C.
Claim 6
Dependent Claim
65 words
A process as claimed in any one of the preceding claims wherein the hydrophobic solvent is selected from the acyclic paraffinic hydrocarbons, mixtures of the acyclic paraffinic hydrocarbons and cyclic paraffinic hydrocarbons, and mixtures of acyclic paraffinic hydrocarbons, cyclic paraffinic hydrocarbons and aromatic hydrocarbons wherein said mixtures contain no more than 10% by weight, based on the total weight of the mixture, of aromatic hydrocarbon.
Claim 7
Dependent Claim
44 words
A process as claimed in any one of the preceding claims, wherein the hydrophilic solvent is a hydroxyl compound and wherein there are from 0.28 to 0.42 moles of hydroxyl functional groups per 100 g. of the total weight of hydrophilic and hydrophobic solvent.
Claim 8
Dependent Claim
30 words
A process as claimed in any one of claims 1 to 5 wherein the weight ratio of the hydrophilic solvent to hydrophobic solvent is from about 1:3 to about 9:11.
Claim 9
Dependent Claim
31 words
A process as claimed in any one of the preceding claims wherein the hydrophilic solvent is selected from the isomers of butanol, pentanol, hexanol, and methyl isobutyl carbinol, and mixtures thereof.
Claim 10
Dependent Claim
29 words
A process as claimed in any one of the preceding claims, wherein said initial monomer is selected to yield polymer having a calculated glass transition temperature at least 70°C.
Claim 11
Dependent Claim
37 words
A process as claimed in any one of the preceding claims wherein said aqueous dispersion is at least partially dried to yield particles which contain single voids and cause opacity in compositions in which they are contained.
Claim 12
Dependent Claim
31 words
A process as claimed in any one of the preceding claims wherein the target organic compound has biocidal or herbicidal activity and is preferably selected from 2-n-octyl-3-isothiazolone, oxyfluorfen and mixtures thereof.
Claim 13
Dependent Claim
34 words
A process as claimed in any one of claims 1 to 10 wherein the organic target compound contains at least one chemically reactive functional group, preferably selected from isocyanate functional group or epoxy group.
Claim 14
Dependent Claim
33 words
Use of a composition comprising core/shell particles prepared by the process as claimed in any one of the preceding claims as or in a coating composition, a herbicidal composition or a biocidal composition.
Claim 15
Dependent Claim
81 words
Core/shell particles having a core, comprising a mixture of at least one hydrophilic solvent and at least one hydrophobic solvent and/or organic target material, encapsulated within a shell of polymer comprising mers of at least two polymerisable mono-ethylenically unsaturated monomers wherein said mers include from 2 to 4 per cent by weight, based on total weight of said mers, of mers of alpha beta-ethylenically unsaturated carboxylic acid, wherein said particles have an average particle size of from 0.22 to 0.55 micrometers.
Claim 16
Dependent Claim
81 words
Core/shell particles having a core, comprising a mixture of at least one hydrophilic solvent and at least one hydrophobic solvent and/or organic target material, encapsulated within a shell of polymer comprising mers of at least two polymerisable mono-ethylenically unsaturated monomers wherein said mers include from 2 to 4 per cent by weight, based on total weight of said mers, of mers of alpha beta-ethylenically unsaturated carboxylic acid, wherein said particles have an average particle size of from 0.22 to 0.55 micrometers.
References Cited (Backward Citations)
No citation records indexed.
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