Polyurethane elastomers from polycaprol- - actones using hydrazine initiator
- 申请公布号：
- DE1936402(A1)
- 申请号：
- DE19691936402
- 申请日期：
- 1969.07.17
- 申请公布日期：
- 1971.02.04
- 申请人：
- FARBENFABRIKEN BAYER AG
- 发明人：
- DIETER WIRTH,DR. WOLF;CORNELIUS MUEHLHAUSEN,DR.
- 分类号：
- C08G18/42;C08G18/46;C08G18/66
- 主分类号：
- C08G18/42
- 摘要：
- Polyurethane elastomers are prepd. from organic polyisocyanates with chain extenders of law mol. wt. donating at least 2 active H atoms and polyesters of m.wt. 1000-5000 which donate at lest 2 OH grps are prepd. by polymerising lactones of formula (where R1 and R2 are 1-4C alkyl, 6-12C cycloalkyl, 1-4C alkoxy, or 6-12C aryl opt. substd. R3 is H or 1-4C alkyl; n is 4,5 or 6) in presence of a hydrazine of formula R4-HN-NH-R5 (where R4 and R5 are H, 1-4C alkyl, 1-4C hydroxyalkyl, allyl, cyanoethyl, 6-12C aryl opt. substd. or heterocyclics) as initiators. Used as bandages etc.
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