초록 ▼

A process for producing a polyether polyol with a content of 0.5 to 99.5% by weight of oxytetramethylene groups derived from tetrahydrofuran by copolymerizing tetrahydrofuran or a mixture of tetrahydrofuran and other cyclic ether copolymerizable therewith with a polyhydric alcohol having two or more

A process for producing a polyether polyol with a content of 0.5 to 99.5% by weight of oxytetramethylene groups derived from tetrahydrofuran by copolymerizing tetrahydrofuran or a mixture of tetrahydrofuran and other cyclic ether copolymerizable therewith with a polyhydric alcohol having two or more hydroxyl groups per one molecule with the use of a heteropoly-acid and/or its salt as a catalyst, which comprises allowing 0.1 to 15 molecules of water per one heteropoly-anion to exist in the catalyst phase. The above-described polyether polyol is an industrially useful polymer which is a starting material for polyurethane to be used for spandex or a synthetic leather, etc.

대표청구항 ▼

A polyether glycol comprising the constituent unit represented by the formula (I) shown below copolymerized randomly with the constituent unit (IV) shown below, with a molar ratio of the unit (I) to the unit (IV) being 99:1 to 5:1, having an average molecular weight of 500 to 10,000, with the molecu

A polyether glycol comprising the constituent unit represented by the formula (I) shown below copolymerized randomly with the constituent unit (IV) shown below, with a molar ratio of the unit (I) to the unit (IV) being 99:1 to 5:1, having an average molecular weight of 500 to 10,000, with the molecule being terminated at both ends with hydroxyl groups: [(CH2)4O] (I) [Figure] (IV) wherein R1 and R2 are selected from the group consisting of －(CH2)n－(wherein n is an integer of 2 to 4), －CH(CH3)CH2－and －CH2CH2－O－CH2－CH2－, and R3 is selected from the group consisting of a hydrogen atom, alkyl groups having 1 to 4 carbon atoms and －(CH2)2－OH. A process for producing a nitrogen containing polyether polyol which comprises copolymerizing tetrahydrofuran with a polyhydric alcohol having the structural formula [Figure] wherein R1 and R2 are selected from the group consisting of －(CH2)n－(wherein n is an integer of 2 to 4), －CH(CH3)CH2－and －CH2CH2－O－CH2－CH2－, and R3 is selected from the group consisting of a hydrogen atom, alkyl groups having 1 to 4 carbon atoms, and －(CH2)2－OH, with the use of a heteropoly-acid and/or its salt as a catalyst, the amount of said polyhydric alcohol being less than 4-fold moles of the heteropoly-anion, and allowing 0.1 to 15 molecules of water per one heteropoly-anion to exist in the catalyst phase.