公开(公告)号：US11384216B2

公开(公告)日：2022-07-12

申请号：US16435716

申请日：2019-06-10

Applicant: Arkema Inc.

Inventor： Lily Liu ,  Wayne Devonport ,  Daniel Edward Stark, Sr. ,  Matthew F. Boudreaux

IPC: C08J9/24 ,  C08J9/28 ,  C08J9/16 ,  C08J9/224 ,  C08F285/00 ,  C08F6/00

Abstract: A process for forming voided latex particles is improved by combining swelling and polymerization of an outer shell into a single step. The process includes contacting multi-stage emulsion polymer particles comprising a core, at least one intermediate shell, with a swelling agent, and polymerizing an outer shell after said contacting with swelling agent wherein the core and the at least one intermediate shell are contacted with swelling agent in the presence of less than 0.5% monomer based on the weight of the multi-stage emulsion polymer particles, and substantially all of the swelling occurs during polymerization of the outer shell.

公开(公告)号：US11866605B2

公开(公告)日：2024-01-09

申请号：US17442346

申请日：2020-03-24

Applicant: Arkema Inc.

Inventor： Donovan K. Lujan ,  Wayne Devonport

IPC: C09D7/65 ,  C09D161/02

CPC classification number: C09D161/02

Abstract: Disclosed are voided latex particles, useful as opacifying agents for coating compositions containing organic solvents. The particles have a hollow interior, which substantially maintains its integrity after the particles are placed in contact with an organic solvent at 25° C. for 30 days. The particles also have a hydrophilic polymeric interior shell surrounding the hollow interior that is swellable with an aqueous swelling solution. The particles have first and second polymeric intermediate shells, surrounding the interior shell, formed from polymers that are different from each other and different from the interior shell polymer. Finally, the particles have an outer polymeric shell, surrounding the interior shells, which is formed from up to 100% by weight, as polymerized units, of methyl methacrylate. The interior shells and the outer shell each have a Tg greater than 60° C. Also disclosed is a multi-stage emulsion process for making the particles.

公开(公告)号：US11459438B2

公开(公告)日：2022-10-04

申请号：US16340183

申请日：2017-10-06

Applicant: Arkema Inc.

Inventor： Lily Liu ,  Daniel E. Stark ,  Wayne Devonport ,  Donovan K. Lujan

IPC: B32B5/16 ,  B29C70/66 ,  C08J9/32 ,  B29C44/34 ,  B29K105/00

Abstract: A thermal insulating additive, product formed therefrom, and method of making the same, wherein the thermal insulating additive comprises a plurality of hollow polymeric particles having an average particle size up to about 0.3 micrometers. The hollow polymeric particles exhibit a mechanical strength in a compression test up to about 420 psi and a thermal conductivity that is less than 0.150 W/m-k. The hollow polymeric particles are individually formed as an alkaline swellable core that is at least partially encapsulated with two or more shell layers; the alkaline swellable core prior to swelling exhibits an average particle size that is less than about 50 nanometers.

公开(公告)号：US20170130093A1

公开(公告)日：2017-05-11

申请号：US15319433

申请日：2015-06-12

Applicant: Arkema Inc.

Inventor： Wayne Devonport ,  Wu Wenjun ,  Kyu-Jun Kim

IPC: C09D175/04 ,  C08G18/67 ,  C08G18/75

Abstract: A latex comprising a urethane linkage and having a high solids content and a low viscosity is described herein. Also described is a process for making the urethane linkage-containing latex wherein urethane linkage formation and emulsion polymerization take place in the same processing step.