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Introduction
A long held belief in the coatings industry is that the film
properties of two resins blended together usually fall short
of those of the tow components taken individually. On the
other hand, formulators recognize that use of a single resin
is rarely if ever, possible to achieve the required
performance requirements. Typically, in a solvent or
waterborne coating two or more "modifiers" are added to a
base resin to achieve the desired coating performance.
In formulating radiation cured coatings, to a large extent,
the role of the "modifying" resins has been given to the
reactive diluents. Monoiners are used to try and balance
properties such as flexibility, surface hardness, cure speed,
viscosity and adhesion. This is a role for which monomers are
well suited.
However, as radiation cure coatings,gain acceptance in the
coatings marketplace, offsetting existing coatings with UV/EB
cure coatings can make conventional UV/EB formulating
strategy hard pressed to succeed. The concept of blending one
or more acrylated oligoiners to achieve the required
performance of a.coating is certainly neither novel, nor new
to the industry. Yet, blending of oligomers usually consists
of modifying a formulation containing a sole oligomer and one
or more monomers with 25% or less of a particular oligomer to
overcome deficiencies in properties such as pigment
dispersibility, cure speed, viscosity, adhesion, etc.
Additionally, there are applications where use of monomers is
not desirable, such as spray applied coatings or coating
substrates where absorption of monomers is a problem.
