| 摘要 |
PURPOSE:To obtain the subject composition, containing a water-soluble alkali salt of a fatty acid as a principal component and further a specific active component blended therewith and capable of preventing or suppressing the stress crack of a polyalkylene terephthalate container while maintaining the lubricity. CONSTITUTION:This composition is obtained by blending (A) a water-soluble alkali salt of a fatty acid (e.g. sodium oleate or triethanolamine salt of coconut oil fatty acid) as a principal component with further (B) an alkali salt of rosin and/or an alkali salt of a disproportionated rosin in an amount of preferably 0.1-1.5 pts.wt. based on 1 pt.wt. component (A). The alkali salt of the rosin which is the component (B) is usually preferably obtained by neutralizing a resin acid such as gum rosin with an alkali. The alkali salt of the disproportionated rosin is preferably prepared by heating the gum rosin, etc., in the presence of a catalyst and then neutralizing the resultant substance with an alkali. The composition is preferably used by a method for regulating the pH to 6-10, as necessary, adding a chelating agent, a germicide, etc., thereto, subsequently diluting the obtained mixture with water and coating the surface of a bottle conveyor with the diluted mixture. |
