To obtain a hardenable polyurethane polymer capable of providing an unhardened and dried coating film hardenable by radiation and having a good pendulum hardness, a high hardness and scratch resistance, and further capable of providing a hardened film having a high hardness and good flexibility by including a specific hydroxy-containing prepolymer in a specified proportion in a copolymerized state.
This hardenable polyurethane polymer comprises (A) 40-80 wt.% one or more kinds of OH group-containing prepolymers having one or more radically or photochemically polymerizable α,β-ethylenically unsaturated double bonds (based on the whole weight), (B) 0.1-20 wt.% one or more kinds of compounds having one or more isocyanate-reactive OH groups and/or primary or secondary amino groups, and further one or more polar functional groups, (C) 0.1-10 wt.% compound selected from a diamine, a polyamine and a mixture thereof, and (D) 10-50 wt.% one or more kinds of polyisocyanates in a copolymerized state. The OH value of the components A to C is 121-300 mg- KOH/g.
LEBKUECHER WERNER (DE)
KOENIGER RAINER (DE)
REICH WOLFGANG (DE)
MENZEL KLAUS (DE)
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