Polyether polyol, method for producing polyether polyol, polyester elastomer and polyurethane
AssigneeMitsubishi Chemical Corporation
InventorsTakanori Taniguchi, Yoko Nakagawa, Ryo Yamashita, Nobuyuki Kobayashi
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Abstract
The present invention provides a high-molecular-weight polyether polyol ensuring that when used as a polyurethane raw material, a polyurethane having excellent flexibility and elastic recovery can be obtained; and a method for producing, with high productivity, a polyether polyol having a higher number average molecular weight and a narrower molecular weight distribution than those of the raw material polyether polyol, and the polyether polyol of the present invention has a number average molecular weight of 3,500 to 5,500 and a molecular weight distribution of 1.7 to 3.0.
Claims16
A polyether polyol, which is a polytetramethylene ether glycol, wherein:
- repeating units in a main framework of the polytetramethylene ether glycol consist of only 1,4-butanediol units;
- the polytetramethylene ether glycol has a number average molecular weight of 3,500 to 5,500;
- the polytetramethylene ether glycol has a molecular weight distribution of 1.8 to 2.2;
- and
- a viscosity of the polytetramethylene ether glycol is 5,500 mPa·s or less, as measured at 40° C. by means of an E-type rotary viscometer.
A method for producing a polyether polyol, which is a polytetramethylene ether glycol, the method comprising:
- subjecting a mixed solution comprising a raw material polytetramethylene ether glycol having a number average molecular weight of 2,500 or more, water and an alcohol to a layer separation, to obtain a product polytetramethylene ether glycol,
- wherein:
- repeating units in a main framework of the product polytetramethylene ether glycol consist of only 1,4-butanediol units;
- the product polytetramethylene ether glycol has a number average molecular weight of 3,500 to 5,500, which is 300 or more higher than a number average molecular weight of the raw material polytetramethylene ether glycol;
- the product polytetraymethylene ether glycol has a molecular weight distribution of 1.8 to 2.2;
- and
- a viscosity of the product polytetramethylene ether glycol is 5,500 mP·s or less, as measured at 40° C. by means of an E-type rotary viscometer.
A polyurethane, comprising, as constituent units:
- a polytetramethylene ether glycol having a number average molecular weight of 3,500 to 5,500, a molecular weight distribution of 1.8 to 2.2, and a viscosity of 5,500 mPa·s or less as measured at 40° C. by means of an E-type rotary viscometer;
- and
- an isocyanate compound,
- wherein repeating units in a main framework of the polytetramethylene ether glycol consist of only 1,4-butanediol units.
A polyether polyol, which is a polytetramethylene ether glycol, wherein:
- repeating units in a main framework of the polytetramethylene ether glycol consist of only 1,4-butanediol units;
- the polytetramethylene ether glycol has a number average molecular weight of 3,500 to 5,500;
- the polytetramethylene ether glycol has a molecular weight distribution of 1.8 to 3.0;
- and
- a viscosity of the polytetramethylene ether glycol is 5,500 mPa·s or less, as measured at 40° C. by means of an E-type rotary viscometer.
A method for producing a polyether polyol, which is a polytetramethylene ether glycol, the method comprising:
- subjecting a mixed solution comprising a raw material polytetramethylene ether glycol having a number average molecular weight of 2,500 or more, water and an alcohol to a layer separation, to obtain a product polytetramethylene ether glycol,
- wherein:
- repeating units in a main framework of the product polytetramethylene ether glycol consist of only 1,4-butanediol units;
- the product polytetramethylene ether glycol has a number average molecular weight of 3,500 to 5,500, which is 300 or more higher than a number average molecular weight of the raw material polytetramethylene ether glycol;
- the product polytetraymethylene ether glycol has a molecular weight distribution of 1.8 to 3.0;
- and
- a viscosity of the product polytetramethylene ether glycol is 5,500 mPa·s or less, as measured at 40° C. by means of an E-type rotary viscometer.
A polyurethane, comprising, as constituent units:
- a polytetramethylene ether glycol having a number average molecular weight of 3,000 to 5,500, a molecular weight distribution of 1.8 to 3.0, and a viscosity of 5,500 mPa·s or less, as measured at 40° C. by means of an E-type rotary viscometer;
- and
- an isocyanate compound,
- wherein repeating units in a main framework of the polytetramethylene ether glycol consist of only 1,4-butanediol units.
Dependencies are inferred from the claim text.