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1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic Dianhydride (CAS: 64198-16-9) - 99% Purity, Kilogram-Scale Supply

2026-07-21 09:42:16
Product Overview

1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic Dianhydride (CAS: 64198-16-9) is a highly sophisticated alicyclic dianhydride monomer of immense commercial value in modern optoelectronics. It is primarily used as a critical monomer for manufacturing Colorless Polyimide (CPI) films, LCD/OLED liquid crystal alignment layers, high-transmittance optical matrices, and low-dielectric (Low-k) insulation materials for 5G/6G high-frequency communications.

1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic Dianhydride

Featuring a unique, rigid cyclobutane ring symmetrically substituted with four methyl groups, this monomer empowers downstream polymers with exceptional thermal stability, enhanced optical transparency, and ultra-low dielectric loss, distinctly outperforming traditional unsubstituted cyclobutane dianhydrides (CBDA). Breaking through the technical limitations of poor synthetic yield and extreme purification difficulties, we proudly offer 99% ultra-high purity, electronic-grade ready stock on a kilogram-scale (kg-scale) for global semiconductor and optoelectronic material leaders.
Core Advantages

  • Electronic-Grade Purity (≥ 99.0%): Purified through advanced directional synthesis, spatial isomer resolution, and multi-stage vacuum recrystallization. Trace metal ions and free carboxylic acids are strictly controlled to satisfy the defect-free film-forming criteria required by semiconductor and next-generation display panels.

  • Stable Kilogram-Scale Capacity: Supported by a fully operational pilot-scale production facility, we completely bypass the single-gram limitations of traditional reagent catalogs. We provide robust, continuous supply capacities from kilograms to hundreds of kilograms to secure your industrial manufacturing pipeline.

  • Exceptional Material Performance Enhancement: The four bulky methyl groups effectively disrupt the formation of intra- and inter-chain Charge Transfer Complexes (CTC). This allows the resulting CPI films to maintain superior heat resistance while achieving an industry-leading near-zero Yellowness Index (Y.I.) and maximum optical clarity.

  • Rigorous Batch Control (QbD): Produced under rigid quality management structures. Every single dispatch is accompanied by a thorough testing booklet comprising a COA (Certificate of Analysis), HPLC (Purity), H-NMR, and Trace Metal Content reports (via ICP-MS).

Technical Specifications

  • Chemical Name: 1,2,3,4-Tetramethyl-1,2,3,4-cyclobutanetetracarboxylic Dianhydride

  • CAS Registry Number: 64198-16-9

  • Molecular Formula: C₁₂H₁₂O₆

  • Molecular Weight: 252.22

  • Melting Point: Approx. 380 °C

  • Appearance: White to off-white crystalline powder.

  • Assay / Purity: ≥ 99.0% (HPLC)

  • Standard Packaging: 100g/bottle, 500g/light-proof bag, 1kg/aluminum foil bag (Customized double-layer vacuum-sealed dark packaging available).

Disclaimer
All chemical products sold by our company are intended solely for laboratory research, export, polymer process engineering, or industrial manufacturing R&D. They are not intended for use as food additives, cosmetic raw materials, or clinical drugs in humans.


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