Thermoplastic polyurethanes prepared from 4,4'-methylenebis (phenyl isocyanate) |
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| 申请号 | US49246474 | 申请日 | 1974-07-29 | 公开(公告)号 | US3901852A | 公开(公告)日 | 1975-08-26 |
| 申请人 | UPJOHN CO; | 发明人 | SHAH TILAK M; | ||||
| 摘要 | Thermoplastic elastomers having excellent physical properties which are retained at low temperatures are prepared from 4,4''methylenebis(phenyl isocyanate), polyethylene glycol (M.W. 600 - 3000) and an extender which is an aliphatic straight chain diol from 3 to 6 carbon atoms or a hydroxyalkylated aromatic compound of the formula WHERE A represents HOCH2-, HOCH2CH20-, and HOCH2CH2OCH2-. The proportion in which the reactants are employed is critical and must satisfy each of the following equations: D R A W I N G |
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| 权利要求 | 1. A THERMOPLASTIC POLYURETHANE ELASTOMER HAVING A HARDNESS WITHIN THE RANGE OF ABOUT SHORE A 70 TO SHORE D 80 WHICH ELASTOMER COMPRISES THE REACTION PRODUCT OF I. 4,4'' -METHYLENEBIS(PHENYL ISOCYANATE), II. A PPOLYETHYLENE GLYCOL HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF ABOUT 600 TO ABOUT 3000, AND III. AN EXTENDER SELECTED FROM THE CLASS CONSISTING OF (1) ALIPHATIC STRAIGHT CHAIN DIOLS FROM 3 TO 6 CARBON ATOMS, INCLUSIVE, (2) DIHYDROXYALKYLATED AROMATIC COMPOUNDS HAVING THE FORMULA 2. A polyurethane elastomer according to claim 1 wherein the extender is the bis(2-hydroxyethyl ether) of hydroquinione. 3. A polyurethane elastomer according to claim 1 wherein the extender is 1,4-butanediol. 4. A polyurethane elastomer according to claim 1 wherein the polyethylene glycol has a molecular weight in the range of about 1000 to about 2500. |
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