发明名称 |
PROCESS FOR PREPARING EPOXY RESIN/PHOSPHORIC ACID REACTION PRODUCTS |
摘要 |
The invention is an improved process for preparing epoxy resin/phosphoric acid reaction products having high enough phosphomonoester contents to be water-dispersible (as base salts) and low enough free acid contents to yield water-resistant cured coatings. The phosphoric acid is provided as an acid source material deriveable by the reaction of a hydroxylic P-OH functionality-limiting agent (blocking agent) with phosphoric anhydride as such or as a reaction product thereof with less than six molecular proportions of water. A resin solvent, which may also function as the P-OH blocking agent but otherwise is inert and acceptable as part of the final coating resin formulation, is employed as the reaction medium. The epoxide/acid reaction is allowed to proceed, effectively in the absence of water, until the content in the reaction mixture of species indistinguishable from H3PO4 by base-titration has dropped to a minimum. Then enough water to hydrolyze the phosphopolyesters present is added and the hydrolysis is carried out, thereby cleaving the ester groups formed from the blocking agent and generating the P-OH groups needed for salification. The disclosed resin compositions are of particular utility for coating the interiors of beverage cans. |
申请公布号 |
AU549192(B2) |
申请公布日期 |
1986.01.16 |
申请号 |
AU19820087378 |
申请日期 |
1982.06.22 |
申请人 |
DOW CHEMICAL CO., THE |
发明人 |
CAMPBELL, K.D.,LANGER, H.G.,MARTIN, P.H.,KLEIN, D. |
分类号 |
C08G59/14;C08G59/40;C08L63/00 |
主分类号 |
C08G59/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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