发明名称 |
A process for making poly(urethane-urea)/addition polymer composite particles |
摘要 |
<p>A process for making poly(urethane-urea)/addition polymer composite particles which avoids the need to use a highly viscous solution of a prepolymer for the poly(urethane-urea). The process comprises dissolving diol and diisocyanate in addition polymerisable monomers and allowing them to co-react but for only long enough to form a precursor for the prepolymer which is of a lower molecular weight than the prepolymer so that the precursor forms a solution of much lower viscosity. This lower viscosity solution is then dispersed in water to give droplets in which the co-reaction continues and completes the formation of the prepolymer whilst water diffuses into the droplets and causes chain extension to create the poly(urethane-urea) particles. The addition polymerisable monomers in the dispersed droplets spontaneously diffuse into the poly(urethane-urea) particles where they are subjected to a conventional free radical addition polymerisation process whereupon composite the poly(urethane-urea)/addition polymer particles are formed. The composite particles can be obtained as stable aqueous dispersions optionally containing less than 3wt% organic solvent and over 40wt% of the composite particles.</p> |
申请公布号 |
EP1164150(A1) |
申请公布日期 |
2001.12.19 |
申请号 |
EP20010202309 |
申请日期 |
2001.06.15 |
申请人 |
IMPERIAL CHEMICAL INDUSTRIES PLC |
发明人 |
WILLIAMS,, NEAL ST. JOHN |
分类号 |
C08F283/00;C08G18/08;C08G18/66;C09D175/06;(IPC1-7):C08G18/08;C09J175/06;C08G18/63;C08G18/12 |
主分类号 |
C08F283/00 |
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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