The present invention provides for a personal care composition suitable for treating hair comprising a composition comprising the reaction product of a) an oxirane or oxetane compound comprising at least two oxirane or oxetane groups and b) an amino silane having the formula: N(H)(R1)R2Si(OR3)3-a-b-c(OR4)a(R5Si(OR6)d(R7)e) b R8C with R1 is chosen from the group consisting of H or a monovalent hydrocarbon radical containing one to 20 carbon atoms R2 is selected from a group consisting of a divalent linear or branched hydrocarbon radical consisting of 1-60 carbons R4 is a hydrocarbon radical that contains 3 to 200 carbon atoms R5 is selected from a group consisting of oxygen or a divalent linear or branched hydrocarbon radical consisting of 1-60 carbons R3, R6, R7, and R8 and are each independently selected from the group of monovalent linear or branched hydrocarbon radicals having from 1 to 200 carbon atoms the subscript b is zero or a positive number and has a value ranging from 0 to 3 the subscripts a is zero or appositive number less than 3, the subscripts b and c are zero or positive and have a value ranging from 0 to 3 subject to the limitation that (a + b + c) < 3 the subscripts d and e are zero or positive and have a value ranging from 0 to 3 subject to the limitation that (d + e) = 3, wherein when hair is treated with said personal care composition said hair has a hydrophobic response to water.Linvention concerne une composition de soins personnels, appropriée pour traiter les cheveux, comprenant un produit de réaction constitué : a) dun composé oxirane ou dun composé oxétane comprenant au moins deux groupes oxirane ou oxétane et b) un amino silane représenté par la formule : N(H)(R1)R2Si(OR3)3-a-b-c(OR4)a(R5Si(OR6)d(R7)e) b R8C dans laquelle R1 est sélectionné dans le groupe constitué par H ou un radical hydrocarboné monovalent contenant 1-20 atomes de carbone R2 est sélectionné dans le groupe constitué par un radical hydrocarboné linéaire ou ramifié divalen
