发明名称 |
REDUCED SOLVENT PROCESS FOR PREPARATION OF AQUEOUS POLYURETHANE DISPERSIONS WITH IMPROVED HEAT AND SOLVENT RESISTANCE |
摘要 |
A process for preparing poly(urethane/urea) prepolymers and aqueous poly(urethane/urea) dispersions (PUDs) therefrom, the poly(urethane/urea) polymers having high heat resistance and good water resistance. The method employs a water-soluble volatile organic solvent, such as acetone, at a level of 0.1-5 %, based on final dispersion weight, a level which does not require removal for purposes of flash point considerations. The method includes the steps of: reacting in the presence of a water-soluble volatile organic solvent at a level corresponding to no more than 5 % by weight of the final dispersion, a polyisocyanate component comprising a diisocyanate, with a polyol component to produce an isocyanate terminated polyurethane prepolymer, the polyol component providing both carboxylate groups and sulfonate groups; dispersing the isocyanate terminated prepolymer in aqueous media; reacting said dispersed isocyanate terminated polyurethane prepolymer with at least one amine functional chain extender or chain terminator compound to thereby form said poly(urethane/urea) polymer; neutralizing the carboxylate and sulfonate groups of said isocyanate terminated prepolymer with an alkali hydroxide or a tertiary amine prior to, or simultaneous with, said reaction of said prepolymer and said amine functional chain extender or terminator; wherein the method is performed without a solvent distillation step. |
申请公布号 |
CA2202245(A1) |
申请公布日期 |
1997.03.20 |
申请号 |
CA19962202245 |
申请日期 |
1996.09.11 |
申请人 |
H.B. FULLER LICENSING & FINANCING, INC. |
发明人 |
DUAN, YOULU;STAMMLER,SONJA |
分类号 |
C08L75/06;B01L3/00;B32B27/00;B32B27/40;C08G18/00;C08G18/08;C08G18/10;C08G18/12;C08G18/42;C08G18/46;C08G18/65;C08G18/66;C08G18/72;C08G18/83;C08L75/04;C09J175/04;C09J175/06;C12Q1/00;G01N33/48;G01N33/53;G01N33/543;G01N37/00 |
主分类号 |
C08L75/06 |
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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