PROCESS FOR PRODUCTION OF URETHANE RESIN AND ADHESIVE AGENT
摘要
<p>Disclosed is a process for production of an urethane resin, which enables to control the molecular weight of an urethane resin in a simple manner independently of the type of a polyisocyanate compound used and also enables to produce an urethane resin that can be used as a removable adhesive agent for use in various application parts ranging from a strongly adhesive region to a slightly adhesive region. The process comprises: reacting a polyol with a first polyisocyanate compound at such a ratio that the amount of the isocyanate group becomes excessive, thereby yielding an isocyanate-terminated prepolymer; and reacting the isocyanate-terminated prepolymer with a chain extender and then further reacted with an end-stopping agent. The chain extender comprises a polyfunctional compound (X) having at least three functional groups that are reactive with an isocyanate group, wherein two of the functional groups are independently a primary hydroxyl group and the remaining functional group(s) is(are) independently a secondary or tertiary hydroxyl group.</p>
