Exhibit 31.1 CERTIFICATION I, Stephen D. Newlin Exhibit 31.2 CERTIFICATION I, Robert M. Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

Exhibit 31.1 CERTIFICATION I, Robert M. Patterson Exhibit 31.2 CERTIFICATION I, Jamie A. Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

Exhibit 31.1 CERTIFICATION I, Robert M. Patterson Exhibit 31.2 CERTIFICATION I, Jamie A. Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

AVNT-2021.06.30-News Release 1 NEWS RELEASE FOR IMMEDIATE RELEASE Avient Announces Registration Details for December 9th Investor Day CLEVELAND – November 3, 2021 – Avient Corporation (NYSE: AVNT), a leading provider of specialized and sustainable material solutions, will host an Investor Day for investment professionals on Thursday, December 9, 2021, from 8:00 a.m. to 1:00 p.m., at the New York Marriott Marquis hotel.

Through this data, we create safety data sheets (SDS), customer certification statements for appropriate use and recommend product safety improvements Global Chemical Control Laws - The current and future focus is on continued Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) assessments and communication on the safe handling of these substances. Global ISO Certificate Library

Exhibit 31.1 CERTIFICATION I, Stephen D. Newlin Exhibit 31.2 CERTIFICATION I, Richard J. Exhibit 32.1 CERTIFICATION PURSUANT TO 18 U.S.C.

Through this data, we create safety data sheets (SDS), customer certification statements for appropriate use and recommend product safety improvements Global Chemical Control Laws - The current and future focus is on continued Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) assessments and communication on the safe handling of these substances.

Wulfsohn      POLYONE CORPORATION68 Exhibit 31.1 CERTIFICATION I, Robert M. Richardson   POLYONE CORPORATION Exhibit 32.1 CERTIFICATION PURSUANT TO 18 U.S.C. POLYONE CORPORATION Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

Are printing/marking solutions available that meet Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) legislative standards?