2Mu Thomas, Hassel, Tillmann. Modified polyureas containing N-cyanaminocarbonyl urea groups and a process for their preparation[P] US:5284928,1994-2-8.
3Waiters, Gunters, J urgen R, et al. Imparting water-repellency with polysiloxanes Containing carboxyl groups[P]. US: 6379751,2002-4-30.
4Kleban, Martin, Kaplan, et al. Chrome-free, water-proof of leather[P]. US: 7060363,2006-6-13.
5克莱班,卡普兰,赖纳斯,等.不含铬的防水皮革[P].CN:1498973A,2004-5-26.
6Harro T, Thomas M, Tillmann H, et al. Polyisocyanate addition compounds containing cyananmide groups and their use[P]. US.. 5554711,1996-9-10.