| 摘要 |
The invention proposes the following method of producing reactive melts which are especially useful as hot-melt adhesives: a) suitable meltable hydroxy or amino-functional polymers or polymer mixes (A) which become liquid at temperatures of above 40 DEG C are inhomogenously mixed with b) powdered, solid, surface-desactivated polyisocyanates (B) or a suspension of such polyisocyanates (B) in a low-volatility vehicle fluid, c) in approximately stoichiometric proportions, at a temperature of at least 40 DEG C in a static mixer so that the resultant mixture of substances exhibits partial regions in which the ratio (1) of polymer (A) to (2) solid isocyanate (B) and desactivating agent (C) is different from the average ratio of these substances or mixtures thereof in the entire mix; d) the inhomogenous mixture is extracted in a form suitable for the intended use and solidified by cooling to below the mixture's softening point. These preformed or possibly non-shaped solid reactive melts are storable at room temperature and retain their latent thermo-reactivity. |
