# US 11,441,026 B2 · Three-stage polymer particle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,441,026 B2
- Document ID: US11441026B2
- Status: Granted
- Kind: B2
- Application number: 16/980,586
- Filed: 2019-03-04
- Published: 2021-02-25
- Granted: 2022-09-13
- Earliest claimed: 2018-03-29
- Assignees: Rohm and Haas Company
- Applicants: Rohm and Haas Company
- Inventors: Hailan Guo; Pu Luo; Morris Wills
- Web page: https://patentgrep.com/patent/US11441026B2

## CPC

- C08F 285/00: Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
- C08L 25/12: with unsaturated nitriles
- C08L 2205/03: containing three or more polymers in a blend
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided is polymer particle comprising (a) 40% to 85% by weight, based on the dry weight of the polymer particle, a core polymer having Tg of −35° C. or lower; (b) 15% to 50% by weight, based on the dry weight of the polymer particle, an intermediate polymer having Tg that is 20° C. or lower and that is higher than the Tg of the core polymer by 10° C. or more; (c) 5% to 30% by weight, based on the dry weight of the polymer particle, a shell polymer having Tg of 50° C. or higher; wherein the shell polymer comprises polymerized units of all vinyl aromatic monomers in an amount of 1% or less, by weight based on the weight of the shell polymer.

## Claims

### Claim 1

A polymer particle comprising
(a) 40% to 85% by weight, based on the dry weight of the polymer particle, a core polymer having Tg of −35° C. or lower;
(b) 15% to 50% by weight, based on the dry weight of the polymer particle, an intermediate polymer having Tg that is 20° C. or lower and that is higher than the Tg of the core polymer by 10° C. or more;
(c) 5% to 30% by weight, based on the dry weight of the polymer particle, a shell polymer having Tg of 50° C. or higher;
wherein the shell polymer comprises polymerized units of all vinyl aromatic monomers in an amount of 1% or less, by weight based on the weight of the shell polymer.

### Claim 2 (depends on 1)

The polymer particle of claim 1, wherein the shell polymer comprises polymerized units of a monomer having Tg of −30° C. or lower.

### Claim 3 (depends on 1)

The polymer particle of claim 1, wherein the core polymer comprises polymerized units of one or more graftlinkers.

### Claim 4 (depends on 1)

The polymer particle claim 1, wherein the polymer particle has volume-average diameter of 500 nm or smaller.