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Introduction
Trimenthylol propane triacrylate (SR-351) has been the major
multifunctional acrylate monomer used in ultraviolet light cured
coatings and adhesives since the late 1950's. Multifunctional
acrylates are used to lower viscosity, increase rate of cure,
provide solvent resistance, and impact resistance in a wide variety
of coatings.
Trimethylol propane triacrylates' alkarie, sterically hindered
backbone provides the fast curing, heat stable, light resistant,
solvent resistant, 'highly brittle performance properties of the
multifunctional monomer. One to fifty percent trifunctional
monomer concentrations are used in coating, formulations which are
typically applied to a substrate at thickness of .0.0002 to 0.0040
inches.
Ethoxylated trilnethylol propane triacrylates (SR—454) and
propoxylated glycerol triacrylate(SR-9020) were introduced in the
middle 1970's to provide forinulators with trifunctionalinonomers
that are not brittle. The new generation alkoxylated monomers
reduced shrinkage and added polarity providing a wide range of
adhesion characteristics and a more resilient, flexible coating
than could be prepared with trimenthylol propane triacrylate.
