The process of obtaining a plant extract containing condensed tannins, with caracteru00ecsticas astringent, modified by copolimerizau00e7u00e3o, for use in tanning and retanning of leather.Plant extract with properties adstrigentes, modified by copolimerizau00e7u00e3o, and use of a plant extract containing tannin modified

摘要

"The process of obtaining a plant extract containing condensed tannins, with caracteru00ecsticas astringent, modified by copolimerizau00e7u00e3o, for use in tanning and retanning of leather.Plant extract with astringent properties, modified by copolimerizau00e7u00e3o, and use of a modified plant extract containing tannins.The present invention relates to a process for obtaining a plant extract containing condensed tannins, with astringent characteristics modified by copolimerizau00e7u00e3o,For use in tanning and retanning of leather; the plant extract thus obtained; and also to their use in the treatment of skin.The process of this invention comprises the following steps: (a) adding a reactor water in a ratio of 2.0 to 5.8% by weight relative to the weight of the load desired; (b) add to the reactor 1.2 to 2.5% by weight of a copolimerizau00e7u00e3o agent, selected from among acrylic acid, methacrylic acid,Mixtures of acrylic acid and methacrylic acid or their esters; stirring; (c) adding acid to glycollic uncle at a proportion of 0.1 to 1.7% by weight, with refrigeration,Leaving react to occur the exothermic reaction and the temperature reaches 95 198 C, after said reaction product leaving the reactional obtained cooling; (d) to adjust the pH to values in the range of 3.5 to 7.0 with the addition of alkali; (E) mixing an extract in powder extracted from a vegetable with water in a ratio of about 0.5 to 2.0 kg / 1 water; or alternatively.Mix a solution of tannin in liquid form at a concentration of 25% to 60%; (f) to elevate the temperature of the mixture to a range between 67 and 98 198C, to occur in the reaction.For a period of 2 hours to 7 hours, preferably 5 hours; (g) adding sodium bisulfite in a proportion of from 0.5 to 4.0% by weight,On the amount of tannin; (H) to elevate the temperature of the mixture while being heated the reactional system at a temperature between 45 and 127 198 C, the pressure is between 0.2 and 7 kgf / cm ^ 2 ^; and (I) maintain a reaction time of about 4 hours.