Lauryl Methacrylate (LMA) – CAS 142-90-5

Product Overview

Lauryl methacrylate (LMA) is a long‑chain methacrylate monomer. It produces soft, flexible, water‑repellent polymers.

  • CAS No.: 142-90-5

  • Appearance: Clear liquid

  • Main feature: Low glass transition temperature (Tg ≈ –65°C)

  • Stabilizer: MEHQ (150–250 ppm) prevents premature polymerization

Key Properties

  • Very low Tg – gives flexibility at room temperature

  • Hydrophobic – excellent water resistance

  • Good adhesion to low‑energy surfaces (plastics, oily substrates)

  • Compatible with acrylic, styrene, and vinyl monomers

Main Applications

Industry Use
Coatings Flexible, weather‑resistant acrylic resins
Adhesives Pressure‑sensitive adhesives (PSA), hot‑melt adhesives
Lubricants Pour point depressants, viscosity improvers
Plastics Impact modifier, internal plasticizer for PVC
Textiles Water‑repellent finishes
Personal care Film‑former in long‑wear cosmetics
3D printing Flexible resin component

Typical Technical Data

Parameter Value
Purity ≥ 98%
Density (25°C) 0.87–0.88 g/cm³
Viscosity (25°C) 4–8 mPa·s
Acid value ≤ 0.5 mg KOH/g
Tg (homopolymer) approx. –65°C
Flash point > 100°C

Frequently Asked Questions (FAQs)

1. What is the difference between LMA and lauryl acrylate?
LMA (methacrylate) gives slightly higher rigidity and better thermal stability than lauryl acrylate. Both are soft, but LMA is more common in durable coatings.

2. Is LMA soluble in water?
No. It is insoluble in water, soluble in organic solvents like toluene, acetone, and ethyl acetate.

3. Why does LMA contain MEHQ?
MEHQ is a stabilizer to prevent spontaneous polymerization during storage. To polymerize, use more initiator or remove MEHQ with alumina.

4. What is the glass transition temperature (Tg) of poly(LMA)?
About –65°C, making it a rubbery polymer at room temperature – ideal for pressure‑sensitive adhesives.

5. Can LMA be used in UV curing?
Yes. It works as a reactive diluent, reducing viscosity while adding flexibility and water repellency.

6. How should I store LMA?
Keep tightly sealed in a cool, dry place below 30°C, away from heat, sparks, and direct sunlight. Do not store with strong oxidizers.

7. Is LMA safe?
It is a skin and eye irritant. Use gloves and goggles. Avoid release into water – harmful to aquatic life.

8. What is a typical dosage in PSA formulations?
Usually 10–40% of total monomer weight, combined with soft acrylates like butyl acrylate or 2‑ethylhexyl acrylate.

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