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Dianal BR-73
Dianal BR-73 is an acrylic resin used in coatings for PVC and PVC leather processing. It is also used in automotive refinish and wallpaper coatings.
Dianal BR-73 is a methyl methacrylate bead resin with a relatively high glass transition temperature (Tg) of 97°C. It is among the hardest of Dianal resins and forms films with superior toughness characteristics. Despite this, it has a modest solubility range, contributes a moderate degree of flexibility in coating films, and offers good adhesion and pigment dispersion capabilities.
BR-73 dissolves in solvents such as toluene, MEK, acetone, and ethyl acetate, forming clear solutions with high viscosity. While BR-73 is used as a binder in applications with rigid substrates, as in the case of automotive refinish coatings and PVC parts, it is also used as a binder in coatings applied to wallpaper. Additionally, it may be used as a processing aid for PVC leathers.
Specifications
Nonvolatiles, min %: 99.0 Clarity in toluene at 30% solids: Clear Gardner color, max: 2 Gardner viscosity at 25°C and 30% solids in toluene: Q–U Glass transition temp, calculated onset °C: 97 Molecular weight: 75,000 Acid number, mg KOH/g resin: 3.3 MFI, g/10 min at 230°C: 3.9
Primary Chemistry: Acrylic
Features & Benefits
High hardness while offering a moderate degree of flexibility Highly resistant to chemical attack, weathering, abrasion, and discoloration Good plasticizer barrier performance
Problems Solved
Low durability of coatings exposed to physical or environmental stress Difficulty finding resins that offer a modest degree of flexibility while exhibiting maximum toughness
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