公开(公告)号：EP0312599A4

公开(公告)日：1989-08-09

申请号：EP88902233

申请日：1988-03-02

申请人： NIPPON KOKAN KK

发明人： ADANIYA TAKESHI NIPPON KOKAN K ,  YAMASHITA MASAAKI NIPPON KOKAN ,  KUBOTA TAKAHIRO NIPPON KOKAN K ,  ENATSU AKIRA ,  NIKAIDO NORIO KANSAI PAINT KAB ,  MIYOSAWA YOSHIAKI KANSAI PAINT ,  NISHIMOTO TADASHI KANSAI PAINT ,  OZAWA KAZUHIKO KANSAI PAINT KA

IPC分类号： B32B15/08 ,  C08G18/64 ,  C08G59/40 ,  C09D5/08 ,  C09D163/00 ,  C09D175/12 ,  C23C22/83 ,  C25D13/00

CPC分类号： C23C22/83 ,  C08G18/643 ,  C08G59/4028 ,  C08K3/11 ,  C08K3/36 ,  C09D5/08 ,  C09D175/12 ,  C23C2222/20 ,  Y10T428/12549 ,  Y10T428/12569 ,  Y10T428/12611 ,  Y10T428/12799 ,  Y10T428/12972 ,  C08L2666/54 ,  C08L75/12

摘要： Steel sheet has three coatings: (1) a Zn or Zn alloy deposit as an under coating deposit, (2) a chromate coating and (3) a coating of resin compsn. (R) in this order. (R) comprises a base resin (A), polyisocyanate cpds., silica, and a chrome cpd. (B) having a low solubility. (A) is obtd. by combining at least one basic nitrogen atom and at least two prim. hydroxy gps. to the thermal of an epoxy resin. The wt. ratio of the base resin (A) to silica lies between 99:1 and 30:70 (pref. 90:10 and 50:50, best 80:20 and 60:40). The wt. ratio of (A) to (B) lies between 99:1 and 60:40 (pref. 97:3 and 65:35, best 75:25). The wt. ratio of (A) to the total wt. of silica and (B) is 75:25 to 50:50 (pref. 70:30-55:45). The wt. ratio of silica to (B) is 37:3-20:20 (pref. 35:5-25:15). The wt. ratio of (A) to the polyisocyanate cpds. lies between 100:5 and 100:80 (pref. 100:10 and 100:50). The silica is specified to be hydrophobic silica. The base resin (A) is specified to be a solvent type. The chrome cpd. (B) is specified to be BaCrO4.