Processes for the preparation of an aqueous dispersion of polyurethane / polyurea stable based on a partially cross-linked polyester adhesive and to the first and second substrates.Aqueous dispersion

摘要

Process for the preparation of a stable aqueous dispersion of polyurethane / polyurea based on a partially cross-linked polyester adhesive and to the first and second substrates.Aqueous dispersion of an adhesive ativu00e1vel stable heat and adhesive.A stable aqueous dispersion of a polyurethane / polyurea partially cross-linked and which is made by insertion of an emulsifier in full and a stabilizer internal dispersion in a polyUrethane having a backbone of polyester or poly - caprolactone diol and chain stretching and cross-linked with a mixture of diamine and triamina which has a feature of 2.05 to 2.18.A solution of high concentration of acid di - hydroxy - carboxylic acid in a solvent such as N-methyl - pyrrolidone allows the hydroxyl groups react fully and quickly with a polyurethane termInado in isocyanate and, consequently, a minimum quantity of the solvent is present in the adhesive after water is removed from the aqueous dispersion.The adhesive is heat resistant to 70 u00b0 C, despite their small degree of cross-linking.