发明申请
- 专利标题: AQUEOUS POLYURETHANE RESIN DISPERSION AND PROCESS FOR PREPARING THE SAME
- 专利标题(中): 水性聚氨酯树脂分散体及其制备方法
-
申请号: US13203454申请日: 2010-02-23
-
公开(公告)号: US20110313101A1公开(公告)日: 2011-12-22
- 发明人: Atsushi Morikami , Masahiro Naiki , Fumio Adachi , Manabu Takahashi
- 申请人: Atsushi Morikami , Masahiro Naiki , Fumio Adachi , Manabu Takahashi
- 优先权: JP2009043483 20090626
- 国际申请: PCT/JP2010/052757 WO 20100223
- 主分类号: C09D175/04
- IPC分类号: C09D175/04 ; C08L75/04
摘要:
An aqueous polyurethane resin dispersion which can easily carry out repaint or removal of an extra coating film after coating on a substrate material is to be provided.It is an aqueous polyurethane resin dispersion which comprises a polyurethane resin obtained by reacting (A) a polyurethane prepolymer which is obtained by reacting (a) a polyisocyanate compound, (b) at least one polyol compound containing a poly-carbonate polyol having a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound, and (d) a blocking agent for an isocyanate group, which dissociates at 80 to 180° C., and (B) a chain elongating agent which has reactivity with the isocyanate group, being dispersed in an aqueous medium, a sum of a content of urethane bodings and a content of urea bondings is 7 to 18% by weight in terms of solid components, a content of carbonate bondings is 15 to 40% by weight in terms of solid components, and a content of an isocyanate group to which the above-mentioned blocking agent has bonded is 0.2 to 3% by weight in terms of solid components and calculated on the isocyanate group.