Page 114 - Handbook of Adhesion Promoters

7.7 Crosslinkers 107

7.7 CROSSLINKERS

GENERAL INFORMATION
Name: Visiomer CAS #: 109-16-0; 3290-92-4 EC #: 203-652-6, 221-950-4
Common synonym: triethyleneglycol dimethacrylate; propylidynetrimethyl trimethacrylate
Molecular mass: 286-338 Active matter, wt%: 98 Purity, %: 95
PHYSICAL PROPERTIES
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Boiling point, C: 200-250 (1013 hPa) Freezing point, C: -25
Color: clear, colorless to yellowish Color, Pt-Co scale: 50-100
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Density, at 20 C, kg/m : 1075-1090
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Refractive index, n D : 1.46-1.473
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Solubility in water at 25 C, wt%: 0.3-3.1
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Vapor pressure at 100 C, kPa: 13
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Viscosity at 25 C, mPa s: 10-64
HEALTH AND SAFETY
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Autoignition temp., C: 255 Flash point, C: 150-167
USE
Manufacturer: Evonik
Outstanding properties: low volatility, high reactivity
Recommended for resins: PVC plastisols
Recommended for products: reactive systems, adhesives, sealants, rubber, elastomers,
composites

Polyurethane-based pressure-sensitive adhesives containing monofunctional ure-
thane acrylate and difunctional urethane acrylate have been cured using electron beam
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irradiation. With increased radiation dose and concentration of crosslinker (isophorone
diisocyanate, methylene diphenyl isocyanate, or triaryl isocyanurate), peel adhesion,
shear adhesion strength, and initial tack were increased, reached a plateau, and then
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declined. Similar observations were made for waterborne polyurethane ink binders cross-
linked with trimethylolpropane where finding the optimum concentration of the cross-
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linker was the goal of the research.