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Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Acrylate Monomer Synthetic Rubber in a Water Emulsion (x=537.29, y=664.03, z=223.59)

This notice of filing announces that a petition has been filed requesting that acrylate monomer synthetic rubber in a water emulsion ((C<INF>5</INF>H<INF>8</INF>O<INF>2</INF>)<I...

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Department of the Treasury

Internal Revenue Service

AGENCY:

Internal Revenue Service (IRS), Treasury.

ACTION:

Notice of filing and request for comments.

SUMMARY:

This notice of filing announces that a petition has been filed requesting that acrylate monomer synthetic rubber in a water emulsion ((C₅ H₈ O₂)_x -(C₇ H₁₂ O₂)_y -(C₆ H₁₀ O₃)_z; x=537.29, y=664.03, z=223.59), also known as ACM Latex, be added to the list of taxable substances. This notice of filing also requests comments on the petition. This notice of filing is not a determination that the list of taxable substances is modified.

DATES:

Written comments and requests for a public hearing must be received on or before March 16, 2026.

ADDRESSES:

Commenters are encouraged to submit public comments or requests for a public hearing relating to this petition electronically via the Federal eRulemaking Portal at https://www.regulations.gov (indicate public docket number IRS-2025-0602 or ACM Latex ((C₅ H₈ O₂)_x -(C₇ H₁₂ O₂)_y -(C₆ H₁₀ O₃)_z; x=537.29, y=664.03, z=223.59) by following the online instructions for submitting comments. Comments cannot be edited or withdrawn once submitted to the Federal eRulemaking Portal. Alternatively, comments and requests for a public hearing may be mailed to: Internal Revenue Service, Attn: CC:PA:01:PR (Notice of Filing for ACM Latex ((C₅ H₈ O₂)_x -(C₇ H₁₂ O₂)_y -(C₆ H₁₀ O₃)_z; x=537.29, y=664.03, z=223.59)), Room 5203, P.O. Box 7604, Ben Franklin Station, Washington, DC 20044. All comments received are part of the public record and subject to public disclosure. All comments received will be posted without change to https://www.regulations.gov, ( printed page 1605) including any personal information provided. You should submit only information that you wish to make publicly available. If a public hearing is scheduled, notice of the time and place for the hearing will be published in the Federal Register .

FOR FURTHER INFORMATION CONTACT:

Jacob W. Peeples or Andrew J. Clark at (202) 317-6855 (not a toll-free number).

SUPPLEMENTARY INFORMATION:

Request To Add Substance to the List

(a) Overview. A petition was filed pursuant to Rev. Proc. 2022-26 (2022-29 I.R.B. 90), as modified by Rev. Proc. 2023-20 (2023-15 I.R.B. 636), requesting that ACM Latex be added to the list of taxable substances under section 4672(a) of the Internal Revenue Code (List). The petition requesting the addition of ACM Latex to the List is based on weight and contains the information detailed in paragraph (b) of this document. The information is provided for public notice and comment pursuant to section 9 of Rev. Proc. 2022-26. The publication of petition information in this notice of filing is not a determination and does not constitute Treasury Department or IRS confirmation of the accuracy of the information published.

(b) Petition Content.

(1) Substance name: Acrylate monomer synthetic rubber in a water emulsion ((C₅ H₈ O₂)_x -(C₇ H₁₂ O₂)_y -(C₆ H₁₀ O₃)_z; x=537.29, y=664.03, z=223.59).

The substance is also known as ACM Latex.

(2) Petitioner: Zeon Chemicals L.P. is an importer of ACM Latex.

(3) Proposed classification numbers:

(i) HTSUS number: 4002.91.0000

(ii) Schedule B number: 4002.91.0000

(iii) CAS number: 93410-24-3

(4) Petition filing dates:

(i) Petition filing date for purposes of making a determination: August 12, 2025.

(ii) Petition filing date for purposes of section 11.02 of Rev. Proc. 2022-26, as modified by section 3 of Rev. Proc. 2023-20: April 1, 2023.

(5) Description from petition: ACM Latex is a water emulsion of acrylate monomer synthetic rubber (“ACM Rubber”). Often, the ACM Rubber has small quantities of cure site monomers which affect physical properties and performance. ACM Latex and ACM Rubber are used in electric vehicle battery manufacture.

ACM Latex is made from propylene, methane, and ethylene. Taxable chemicals constitute 45.45 percent by weight of the materials used to produce this substance.

(6) Process identified in petition as predominant method of production of substance: The predominant method of producing ACM Latex is by emulsion polymerization of ethyl acrylate, butyl acrylate, and methoxy ethyl acrylate in the presence of an emulsifier and a free-radical initiator. Ethyl acrylate monomer is produced by acid-catalyzed esterification of acrylic acid with ethanol. Acrylic acid is produced by the oxidation of propylene. Ethanol is produced by biological processes (fermentation of sugars with yeast). Butyl acrylate monomer is produced by the acid-catalyzed esterification of acrylic acid with butanol. Butanol is produced by the hydroformylation of propylene to butanal, which is then reduced with hydrogen. Hydrogen is produced from steam-methane reforming. Methoxyethyl acrylate monomer is produced by acid-catalyzed esterification of acrylic acid with methoxyethanol. Methoxyethanol is produced from methanol and ethylene glycol. Methanol is produced from carbon monoxide and hydrogen. Ethylene glycol is produced from ethylene oxide and water. Ethylene oxide is produced by the oxidation of ethylene.

(7) Stoichiometric material consumption equation, based on process identified as predominant method of production:

(x+2y+z) C₃ H₆ (propylene) + ((1/2)y+z) CH₄ (methane) + z C₂ H₄ (ethylene) + x C₂ H₅ OH (ethanol) + (3/2(x+y)+2z) O₂ (oxygen) + (y+z) CO (carbon monoxide) → (C₅ H₈ O₂)_x -(C₇ H₁₂ O₂)_y -(C₆ H₁₀ O₃)_z (ACM Latex) + (2x+y+z) H₂ O (water) + (1/2(y+z)) CO₂ (carbon dioxide)

(8) Tax rate calculated by Petitioner, based on Petitioner's conversion factors for taxable chemicals used in production of substance:

(i) Tax rate: $5.73 per ton.

(ii) Conversion factors: 0.52 for propylene, 0.04 for methane, and 0.04 for ethylene.

(9) Public docket number: IRS-2025-0602.

Michael H. Beker,

Senior Counsel (Energy, Credits, and Excise Tax), IRS Office of Chief Counsel.

[FR Doc. 2026-00506 Filed 1-13-26; 8:45 am]

BILLING CODE 4831-GV-P

Legal Citation

Federal Register Citation

Use this for formal legal and research references to the published document.

91 FR 1604

Web Citation

Suggested Web Citation

Use this when citing the archival web version of the document.

“Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Acrylate Monomer Synthetic Rubber in a Water Emulsion (x=537.29, y=664.03, z=223.59),” thefederalregister.org (January 14, 2026), https://thefederalregister.org/documents/2026-00506/superfund-tax-on-chemical-substances-request-to-modify-list-of-taxable-substances-notice-of-filing-for-acrylate-monomer-.