WATER-BASED WATER REPELLANT FOR TREATMENT OF SUBSTRATES

摘要

An aqueous water repellent useful in the treatment of substrates of lignocellulose-origin materials or the like is characterized by comprising the product of co-hydrolytic condensation of (A) 100 parts by weight of an organosilicon compound having the formula: (R<1>)a(OR<2>)bSiO(4-a-b)/2 wherein R<1> is alkyl, R<2> is alkyl, 0.75≤a≤1.5, 0.2≤b≤3 and 0.9 < a+b≤4, and (B) 0.5-49 parts by weight of an amino-containing alkoxysilane having the formula: R<3>R<4>NR<5>-SiR<6> n(OR<2>)3-n wherein R<3> and R<4> are H or alkyl or aminoalkyl, R<5> is a divalent hydrocarbon group, R<6> is alkyl, and n is 0 or 1, or a partial hydrolyzate thereof in the presence of an organic acid or inorganic acid.