Method of making a resin
View Patent ↗A method of making a resin, includes forming an aqueous monomer droplet suspension, and colloidally stabilizing the suspension with a solid particulate material as the first stabilizer and poly(2-ethyl-2-oxazoline) as a second stabilizer. The method further includes heating the colloidally stabilized suspension to polymerize the monomer droplets, thereby forming the resin.
1. A method for making a resin, comprising:
forming an aqueous suspension of droplets of one or more monomers in an aqueous medium that further comprises a polymerization initiator or catalyst, a promoter species, and a first stabilizer that is a solid particulate inorganic compound,
providing a second stabilizer in the aqueous suspension to provide a colloidally stabilized suspension, which second stabilizer is a poly(2-ethyl-2-oxazoline) homopolymer, and
heating the colloidally stabilized suspension to polymerize the one or more monomers in the droplets, thereby forming particles of the resin.
2. The method of claim 1 , where the first stabilizer comprises colloidal silica particles.
3. The method of claim 1 , wherein the one or more monomers comprise one or more of styrene, vinyl toluene, o-, p- or m-chlorostyrene, chloromethyl styrene, divinylbenzene, ethylene glycol dimethacrylate, vinyl chloride, vinylidene chloride, vinyl acetate, alpha olefins, butadiene, isobutylene, methyl acrylate, methyl methacrylate, butyl acrylate, and butyl methacrylate.
4. The method of claim 1 , wherein the one or more monomers comprises divinylbenzene or ethylene glycol dimethacrylate.
5. The method of claim 1 , wherein the promoter species comprises poly(adipic acid-co-methylaminoethanol).
6. The method of claim 1 , wherein the polymerization initiator or catalyst is a peroxide or azo compound.
7. The method of claim 1 , wherein the second stabilizer is provided in the aqueous suspension with the first stabilizer.
8. The method of claim 1 , wherein the first stabilizer comprises colloidal silica particles; the one or more monomers comprise styrene, divinylbenzene, and butyl acrylate, the promoter species is poly(adipic acid-co-methylaminoethanol); and the polymerization initiator or catalyst is a peroxide.
9. The method of claim 1 , wherein the amount of second stabilizer is at least 0.11 weight % and up to and including 0.21 weight %, based on the total weight of the one or more monomers.