Patent ID: 8765881

Claim:
A method of making a polydiorganosiloxane block copolymer, the method comprising: providing an oxalylamino-containing compound of Formula (I) wherein each R 1 is independently an alkyl, haloalkyl, aralkyl, substituted aralkyl, alkenyl, aryl, substituted aryl, or imino of formula —N═CR 4 R 5 ; each R 2 is independently hydrogen, alkyl, aralkyl, aryl, or part of a heterocyclic group that includes Q and a nitrogen to which R 2 is attached; R 4 is hydrogen, alkyl, aralkyl, substituted aralkyl, aryl, or substituted aryl; R 5 is an alkyl, aralkyl, substituted aralkyl, aryl, or substituted aryl; Q is (a) an alkylene, (b) arylene, (c) a carbonylamino group linking a first group to a second group, wherein the first group and the second group are each independently an alkylene, arylene, or a combination thereof, (d) part of a heterocyclic group that includes R 2 and the nitrogen to which R 2 is attached, or (e) a combination thereof; p is an integer equal to at least 1 and wherein at least 90 weight percent of the compound of Formula (I) has p equal to 1; and reacting the oxalylamino-containing compound of Formula (I) with a silicone-based amine, wherein the silicone-based amine has a polydiorganosiloxane segment and at least two primary amino groups, at least two secondary amino groups, or at least one primary amino group plus at least one secondary amino group.