Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Kumho Mitsui LL Isocyanate Curing Agent

Kumho Mitsui’s LL series isocyanate curing agent—LL-100—delivers exceptional weather resistance, gloss retention, and mechanical durability for high-performance polyurethane coatings. Designed for automotive and industrial OEM applications, it enables low-VOC formulations with rapid cure kinetics and superior film flexibility. Its aliphatic hexamethylene diisocyanate (HDI) trimer structure ensures UV stability and color retention without yellowing. Widely adopted in premium clearcoats and topcoats requiring long-term aesthetic integrity and chemical resistance.
  • kumho mitsui ll isocyanate curing agent_5cc8c21c
  • kumho mitsui ll isocyanate curing agent_5cc8c21c

Features Of Kumho Mitsui LL Isocyanate Curing Agent

  1. Low-viscosity liquid formulation enabling easy handling and homogeneous mixing with polyol resins.

  2. Excellent compatibility with polyester, polyether, and polycarbonate diols for broad resin system flexibility.

  3. Controlled reactivity profile supporting extended pot life and reliable film formation in ambient or forced-dry conditions.

  4. High crosslink density development yielding superior chemical resistance, abrasion resistance, and mechanical durability.

  5. Low monomeric MDI content meeting stringent VOC and occupational health requirements for industrial coating applications.

Typical Applications Of Kumho Mitsui LL Isocyanate Curing Agent

  1. Automotive OEM clearcoats and refinish topcoats requiring high gloss and long-term weatherability.

  2. Industrial maintenance coatings for metal and concrete substrates exposed to harsh chemical environments.

  3. High-performance plastic coatings for automotive interior trim and electronic housings.

  4. Two-component polyurethane floor coatings in commercial and pharmaceutical cleanroom facilities.

  5. Adhesives and sealants demanding rapid green strength development and thermal stability.

Specifications Of Kumho Mitsui LL Isocyanate Curing Agent

Chemical TypeAliphatic polyisocyanate blend (HDI-based)
Product FormClear, colorless to pale yellow liquid
AppearanceHomogeneous, transparent liquid without sediment
NCO Content (wt%)15.8–16.2%
Viscosity @ 25°C (mPa·s)800–1,200
Specific Gravity @ 25°C1.17–1.19
Storage Stability (unopened, 25°C)≥12 months
Primary Applications2K PU coatings, adhesives, elastomers, and sealants


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