Process Of Making A Stable Aqueous Dispersion Of Concentrated, Finely Divided Particles Of A Biocide
This invention provides a process of making a stable aqueous dispersion including concentrated, finely divided particles of a water insoluble biocide active, which comprises grinding the biocide in water in the presence of a non-ionic polymeric dispersant and optionally a co-dispersant, and compositions prepared by this process.
1 . A process of making a stable aqueous dispersion including concentrated, finely divided particles of a water insoluble biocide active, which comprises: grinding the biocide in water in the presence of a non-ionic polymeric dispersant and optionally a co-dispersant.
2 . A process according to claim 1 wherein said co-dispersant is an anionic polymeric co-dispersant.
3 . A process to the claim 2 wherein said co-dispersant is the partially neutralized butyl half ester of a copolymer of poly(methylvinyl ether/maleic acid) and polyvinyl pyrrolidone.
4 . A process according to claim 1 wherein said particles have a particle size of less than 500 nm.
5 . A process according to claim 1 wherein said aqueous dispersion has a viscosity of 100-6000 mPa.
6 . A process according to claim 4 wherein said particle size is without 100-30 nm.
7 . A process according to claim 1 wherein said dispersion is pumpable.
8 . A process according to claim 1 wherein said biocide is iodopropynyl butyl carbamate (IPBC).
9 . A process according to claim 1 wherein said biocide is present in said aqueous dispersion in a concentration of about 20-60% by weight.
10 . A process according to claim 1 wherein said grinding step is carried out in the presence of a grinding aid.
11 . A process according to claim 1 which includes adding a thickening agent to said dispersion.
12 . A process according to claim 1 wherein said dispersant is an EO/PO copolymer.
13 . A process according to claim 1 wherein said co-dispersant is present.
14 . A stable aqueous dispersion composition comprising concentrated, finely divided particles of a biocide, and a dispersant which is a nonionic polymeric dispersant, optionally including a co-dispersant which is a partially neutralized butyl half-ester of a copolymer of poly(methylvinyl ether/maleic acid) and polyvinyl pyrrolidone.
15 . A composition according to claim 14 wherein said dispersant is an EO/PO polymer.
16 . A composition according to claim 14 which has a viscosity of 100-6000 mPa.
17 . A composition according to claim 14 wherein said biocide is IPBC.
18 . A composition according to claim 14 wherein biocide is present in a concentration of 20-60% by weight.
19 . A composition according to claim 14 wherein said dispersant is an EO/PO block polymer having a molecular weight of at least 5000 amu.
20 . A composition according to claim 14 wherein the particle size of said particles is less than 500 nm.
21 . A composition according to claim 20 wherein said particle size is about 100-300 nm.
22 . A composition according to claim 14 which is a paint, a building material, a polymer, a metal working fluid or a wood treatment composition.
23 . A composition according to claim 22 which includes a clay, a stabilizer and/or a UV block or absorber.