Generally, there are no substitutes for a clean, well-prepared surface to allow coatings and adhesives to adhere well to their substrates. However, choosing the proper resin can help to extend the working life of acrylic coatings and adhesives by providing better adhesion to various material types.
Mitsubishi Chemical Group's Elvacite® acrylic resins have long been the leader in quality adhesive and coating resins for substrate materials such as plastics, metals, concrete, wood, and paper. Recently, Mitsubishi Chemical Group released new adhesive and coating resin options specifically targeted at improving adhesion to difficult substrates like metals and plastics.
Metals, including aluminum, steel, copper, and zinc, are frequently used in environments that require a protective coating to prevent corrosion and rust. Adhesives that bond metals are also gaining popularity as stress on joints can be distributed across the bond line rather than concentrated at fastening sites. Bonding to metal can be tricky, and light sanding and a primer are usually necessary. Elvacite® 4349 is an acrylic copolymer resin that provides outstanding adhesion to untreated and unprimed metals. It also has the flexibility, outdoor durability, and abrasion resistance needed for the most challenging applications and environments.
| Property | Typical Value |
|---|---|
| Appearance | White, spherical beads |
| Chemical Composition | Methyl Methacrylate / Butyl Methacrylate Copolymer |
| Molecular Weight | 60,000 |
| Tg (°C) | 65 |
| Acid Value (mg KOH/g) | 3.5 |
Sometimes, the initial adhesion of a coating or adhesive may be good. However, adhesion issues arise once high stress is applied to the bond. This type of adhesive failure is usually due to a lack of flexibility and is a common issue for packaging applications where flexible films are utilized. Elvacite® 4345 is a low Tg butyl methacrylate resin ideal for adhesives and coatings applied to smooth plastic and metallized films. This resin can also be used to plasticize other resins to improve flexibility and adhesion to flexible substrates.
Click here for a starting point formulation for a flexible laminating adhesive based on Elvacite® 4345 resin.
| Property | Typical Value |
|---|---|
| Appearance | White, free flowing bead |
| Chemical Composition | N-butyl Methacrylate |
| Tg (°C) | 20 |
| Molecular Weight | 211,000 |
| Acid Value (mg KOH/g) | 0 |
| Property | Typical Value |
|---|---|
| Appearance | Spherical beads |
| Chemical Composition | Methacrylate Copolymer |
| Molecular Weight | 60,000 |
| Tg (°C) | 50 |
| Acid Value (mg KOH/g) | 3.5 |
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