1,3-Isobenzofurandione, 5,5'-[(1-methylethylidene)bis(4,1-phenyleneoxy)]bis-, polymer with 1,3-benzenediamine

CAS 61128-46-9

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$516M

Import volumeZero

Top sourceGermany 22%

At least one company claimed its 2019 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 391190 · basket

EPA reports by year

2019: US production Confidential · Imports Zero

These shares come from HS customs code 391190, which covers 36 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

DE 22%GermanyJP 17%JapanCA 15%CanadaGB 14%United KingdomCN 9%China

Malaysia
Sweden
Poland
Netherlands
Hungary
Denmark
Saudi Arabia
Brazil
Hong Kong
Trinidad and Tobago
Ireland
Australia
Lithuania
Israel
Slovenia
Turkey
Ecuador
Honduras
Peru
Philippines
Chile
Luxembourg
Dominican Republic
Vietnam
Czech Republic
Finland
Greece
United Arab Emirates

EPA-registered manufacturers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Weylchem Us

Why It Matters

Sectors

Plastics & Rubber

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Intermediate in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS61128-46-9

PubChem CIDNot recorded

DTXSIDDTXSID90976644

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID90976644Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

1,3-Isobenzofurandione, 5,5'-[(1-methylethylidene)bis(4,1-phenyleneoxy)]bis-, polymer with 1,3-benzenediamine (CAS 61128-46-9) https://chemicalindependence.com/chemical/61128-46-9/ EPA CompTox (DSSTox): DTXSID90976644. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID90976644 EPA Chemical Data Reporting: 61128-46-9. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 61128-46-9. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 391190 for CAS 61128-46-9. Reporting year: 2024. https://usatrade.census.gov/