2,2-Bis(3-amino-4-hydroxylphenyl)propane (BAP) CAS 1220-78-6

Synonyms: BHAPP; 4,4'-(Propane-2,2-diyl)bis(2-aminophenol); 4,4'-Isopropylidenebis(2-aminophenol); Phenol, 4,4'-(1-methylethylidene)bis[2-amino-; 2,2-Bis(3-amino-4-hydroxyphenyl)propane; 2-amino-4-[2-(3-amino-4-hydroxyphenyl)propan-2-yl]phenol

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Product Details

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2,2-Bis(3-amino-4-hydroxyphenyl)propane (BAP), CAS 1220-78-6, also known as APA or 4,4'-Isopropylidenebis(2-aminophenol), is a diamino dihydroxy monomer featuring a propane core, enabling the synthesis of advanced polymers with excellent thermal stability, chemical resistance, mechanical properties, and flame retardancy.

Basic Information of BAP

Product Name	2,2-Bis(3-amino-4-hydroxylphenyl)propane
Abbreviation	BAP
CAS Number	1220-78-6
Molecular Formula	C15H18N2O2
Molecular Weight	258.32 g/mol
Appearance	White to yellow to orange powder to crystal
Purity	≥99.5%
Package	1kg/bottle, 20kg/drum, or customized
Molecular formula

Key Properties

High thermal stability (high melting point)
Dual amine + hydroxyl functional groups for crosslinking / reactive modifications
Aromatic backbone ensures mechanical strength and rigidity
Good solubility in polar aprotic solvents (e.g. DMF) for polymerization
Moderate polarity and hydrogen bonding capability enhance adhesion / interface compatibility

Key Applications of BAP

High-Performance Polymers: Serves as a monomer for synthesizing polyimides, polyamides, and polybenzoxazoles (PBOs), used in aerospace composites, engineering plastics, and structural materials requiring heat resistance and durability.

Gas Separation Membranes: Incorporated into thermally rearranged polybenzoxazoles (TR-PBOs) derived from o-hydroxy polyimides, offering high gas permeability and selectivity (e.g., for CO₂/CH₄ separation, H₂ purification), ideal for natural gas processing and biogas treatment.

Electronics and Optoelectronics: Utilized in insulating materials for semiconductors, optical films, OLED/LCD displays, and electronic components, leveraging its low dielectric constant and electrical insulation properties.

Flame-Retardant Materials: Employed in epoxies, polyurethanes, composites, textiles, and coatings for fire safety applications, providing inherent flame resistance without additional retardants.
Energy Applications: Applied in high-temperature fuel cells and related components, benefiting from its stability in harsh environments.

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