| http://www.w3.org/ns/prov#value | - In a process for forming a heat-activatable polyurethane powder composed of a mixture of two separate types of particles, one type having blocked --NCO groups, and the second having terminal active hydroxyl-containing groups, so that the said mixture provides chemically equivalent amounts of each type, the improvement comprising forming the first type of particles by the steps of1. mixing a polyme
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