(C9H4O5.C6H10O4.C5H12O2)x CAS No. 28407-73-0

Uses/Applications

• High-Performance Coatings: Used as a film-forming agent for industrial and consumer coatings requiring durability, chemical resistance, and weatherability; includes coil coatings (for pre-painted metal sheets in buildings and appliances), can coatings (interior/exterior of food/beverage cans), automotive topcoats (especially clear coats for high gloss), and powder coatings (applied as powder and cured by heat).
• Cosmetics/Personal Care: Film-forming agent in nail polishes, nail strengtheners (e.g., OPI Nail Envy Nail Strengthener - Magenta Pink), and other products for creating durable, flexible coatings; evaluated as safe for use in nail formulations by safety panels.
• Other Applications: Adhesives, engineering plastics, and high-performance materials where thermal stability and chemical resistance are needed.

Properties/Characteristics

• Type: Thermosetting polyester resin (a type of alkyd resin); aromatic-aliphatic copolymer with balanced flexibility (from adipic acid) and rigidity (from trimellitic anhydride).
• Durability: Excellent resistance to scratching, chemicals, solvents, and hydrolysis (water); high hardness and rigidity due to crosslinks.
• Weatherability/Stability: Good UV resistance, thermal stability, and resistance to yellowing/degradation; enhanced by neopentyl glycol's sterically hindered structure.
• Adhesion: Strong adhesion to metals and other substrates.
• Other Physical Properties: Forms durable, flexible coatings; thermosetting (cannot be re-melted once cured); provides toughness, impact resistance, gloss, and clarity.
• Hazard Properties: Generally not classified under GHS (Globally Harmonized System) for most criteria (97.4% of reports indicate no hazards); reported as not meeting GHS hazard criteria by 37 of 38 companies. However, in mixtures (e.g., nail products), it may contribute to skin sensitization (allergic skin reaction).

Components/Monomers

Hexanedioic acid, polymer with 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid and 2,2-dimethyl-1,3-propanediol is a synthetic copolymer (polyester resin) formed from the following monomers:

• Hexanedioic acid (common name: Adipic Acid; formula: C6H10O4 or HOOC-(CH₂)₄-COOH) – Provides linear, flexible segments for toughness and impact resistance.
• 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid (common name: Trimellitic Anhydride or TMA; formula: C9H4O5) – A tri-functional molecule that creates branching points and crosslinks for rigidity, hardness, heat resistance, and chemical resistance (typically reacts in anhydride form).
• 2,2-dimethyl-1,3-propanediol (common name: Neopentyl Glycol or NPG; formula: C5H12O2 or HO-CH₂-C(CH₃)₂-CH₂-OH) – A symmetrical, branched diol that enhances hydrolytic stability (water resistance), UV resistance, weatherability, flexibility, and clarity by preventing close chain packing.

Hazards/Safety Information

• GHS Classification: Not classified (aggregated from 38 reports; only 2.6% provided GHS information, with no hazards in most cases). One notification indicates potential hazards, but details vary by impurities/additives.
• Primary Hazards: In pure form, low hazard profile; does not meet GHS criteria for most reports. In mixtures (e.g., nail products), may cause allergic skin reaction, serious eye irritation, or drowsiness/dizziness (as part of flammable liquid mixtures).
• First Aid: After skin contact, wash with water and soap; after eye contact, rinse with water; after inhalation, supply fresh air; after swallowing, consult a doctor if symptoms persist.
• Fire-Fighting: Use CO2, powder, or water spray; protect against electrostatic charges.
• Accidental Release: Ensure ventilation; absorb with liquid-binding material; avoid sewers/groundwater.
• Handling/Storage: Store in cool, well-ventilated, tightly closed containers; avoid ignition sources; use non-sparking tools.
• Exposure Controls: Use protective gloves (impermeable material), eye protection, and respiratory filters in high-exposure scenarios; wash hands after handling.
• Other: EPA TSCA Commercial Activity Status: ACTIVE; exempt from certain reporting under Chemical Data Reporting Rule.

Regulatory Information

• Australian Inventory of Industrial Chemicals (AICIS): Listed; IMAP assessments available for human health (Tier I) and environment (Tier I).
• EPA TSCA (US): Listed; regulatory flag XU (exempt from reporting under Chemical Data Reporting Rule, 40 CFR 711).
• New Zealand EPA Inventory: Does not have individual approval but may be used as a component in group-standard products; not approved for standalone use.
• European Chemicals Agency (ECHA): Aggregated notifications show low hazard; C&L Inventory details available.
• Other: For cosmetics, safe for nail use per relevant panels; no PBT/vPvB assessment indicated.

Product Documents

• Safety Data Sheet (SDS)
• Certificate of Analysis
• Product Brochure
• Technical Data Sheet