发明名称 |
PROCESS FOR THE PREPARATION OF COMPOUNDS CONTAINING HYDROXYLGROUPS AND THEIR USE IN THE PRODUCTION OF POLYURETHANE RESINS |
摘要 |
<p>Compounds containing alcoholic hydroxyl groups suitable as a starting material for the isocyanate polyaddition process by the alcoholysis of polyisocyanate polyaddition products are produced. Polyurethane urea or polyurea waste products having a molar ratio of urea groups to urethane groups of from 1:20 to 1:0 are heated in size reduced form to temperatures of from 120 to 250.degree.C together with B) polyhyhdric alcohols in the molecular weight range of from 62 to 250 in a ratio by weight of A:B of from 3:1 to 1:10. At least 10% of the polyhydric alcohol B put into the process is subsequently removed by distillation under reduced pressure. A total of up to 1000% by weight, based on the weight of polyurethane urea or polyurea waste A, of one or more polyhydroxy compounds having a molecular weight above 250 which is (are) not volatile under the distillation conditions may optionally be added to the mixture before and/or after removal of the excess alcohol B by distillation. The resulting compounds containing hydroxyl groups may be used as starting material for the production of polyurethane resins by the isocyanate polyaddition process.</p> |
申请公布号 |
CA2084922(A1) |
申请公布日期 |
1993.06.13 |
申请号 |
CA19922084922 |
申请日期 |
1992.12.09 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
MUENZMAY, THOMAS;RASSHOFER, WERNER;DOERNER, KARL-HEINZ;LIMAN, ULRICH |
分类号 |
C08G18/00;C08G18/83;C08J11/24;C08L75/04;(IPC1-7):C08J11/04;C08G18/08 |
主分类号 |
C08G18/00 |
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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