| 摘要 |
<p>There is provided a thermoplastic adhesive which consists of a reaction product of tall oil pitch with an organic anhydride, such as maleic anhydride, saponified with a multivalent metal hydroxide, such as calcium hydroxide. The reaction between tall oil pitch and the anhydride is preferably carried out by heating in the range of 120.degree.C to 200.degree.C for one to eight hours. The saponification is either complete or partial and is carried out by reacting the adduct obtained from the reaction of the tall oil pitch with the anhydride, with a suitable amount of the multivalent metal hydroxide at about 200.degree.C for ten to thirty minutes. The produced adhesive is solid at room temperature and can possess, depending on the formulation, either high binding strength or prolonged pressure-sensitive character.</p> |
