METHOD OF SUSPENSION POLYMERIZATION OF DROPLETS DISTRIBUTED IN AN AQUEOUS MEDIUM

• US 20190002600A1
• Filed: 12/15/2016
• Published: 01/03/2019
• Est. Priority Date: 12/22/2015
• Status: Active Grant

• Current Assignee: DDP Specialty Electronic Materials US 8, LLC
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Savo, Andrew M., Reichert, Matthew D., Finch, John David, Mcintosh, III, Lester H., Johnson, Robert, Schultz, Alfred K.
• Granted Patent: US 10,640,580 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 16/06 Polyvinyl alcohol ; Vinyl alcohol
• CPC Class Codes: C08F 2/18 Suspension polymerisation
• CPC Class Codes: C08F 2/20 with the aid of macromolecular dispersing agents
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 212/34 Monomers containing two or more unsaturated aliphatic radicals
• CPC Class Codes: C08F 212/36 Divinylbenzene
• CPC Class Codes: C08F 230/06 containing boron
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08K 5/14 Peroxides

Abstract

Provided is a method of suspension polymerization comprising

• • (I) providing a composition comprising droplets distributed in an aqueous medium, wherein the droplets comprise one or more boronic acids, one or more monomers, and one or more initiators, and wherein the aqueous medium comprises polyvinyl alcohol; wherein the one or more boronic acids are present in an amount of 0.002% or more, by weight based on the weight of the droplets, and
  • (II) stressing the composition so that the initiator initiates polymerization of the monomer.

Claims

1. A method of suspension polymerization comprising

(I) providing a composition comprising droplets distributed in an aqueous medium, wherein the droplets comprise one or more boronic acids, one or more monomers, and one or more initiators, and wherein the aqueous medium comprises polyvinyl alcohol;

wherein the one or more boronic acids are present in an amount of 0.002% or more, by weight based on the weight of the droplets, and

(II) stressing the composition so that the initiator initiates polymerization of the monomer.

2. The method of claim 1, wherein the one or more initiators comprises an initiator selected from the group consisting of peroxide initiators and hydroperoxide initiators.

3. The method of claim 1, wherein the providing step is performed within a temperature range that falls between 15°

C. and 30°

C., and wherein the stressing step comprises raising the temperature to 65°

C. or higher.

4. The method of claim 1, wherein the one or more monomers comprise one or more vinyl aromatic monomers.