Thermoplastic, elastic polyurethanes which are soluble in ethers and/or ketones
AssigneeBASF SE
InventorsGuenter Vaeth, Rudolf Bachmann, Heinrich Hartmann, Herbert Spoor, August Lehner
Life of this patent
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Abstract
Thermoplastic, elastic polyurethanes which are soluble in ethers and/or ketones and have a high surface hardness and high modulus of elasticity are manufactured from a polyester-ol and/or a polyether-ol, a substituted or unsubstituted diisocyanato-diphenylmethane or diisocyanato-diphenylsulfone, an aliphatic, branched-chain diol of the formula HOCH.sub.2 --CR.sup.1 R.sup.2 --CO.sub.2 OH, in which R.sup.1 is alkyl and R.sup.2 is alkyl or hydrogen, and, optionally, a triol.
Claims9
Thermoplastic, elastic polyurethanes which are soluble in ethers and/or ketones and have a high surface hardness and high modulus of elasticity, which are obtained by reaction of
- A. one mole of a lineaar polyester-ol and/or polyether-ol of molecular weight from 600 to 4,000,
- B. from 4 to 16 moles of a branched-chain diol of the formula ##STR6## in which R.sup.1 is alkyl of 1 to 4 carbon atoms and R.sup.2 is hydrogen or alkyl of 1 to 4 carbon atoms and optionally
- C. from 0.001 to 1 mole of an aliphatic triol, with
- D. from 5 to 18.5 moles of an aromatic diisocyanate of the formula ##STR7## in which X is methylene or a SO.sub.2 group and R and R' are hydrogen, chlorine and/or methyl, the ratio of the number of hydroxyl groups employed to the number of isocyanate groups being from about 1:0.98 to 1:1.08.
A process for the manufacture of thermoplastic and elastic polyurethanes which are soluble in ethers and/or ketones and have a high surface hardness and high modulus of elasticity, from a polyester-ol and/or polyether-ol, an aromatic diiscyanate, an aliphatic branched-chain diol and, optionally, a triol, which comprises:
- reacting
- A. 1 mole of one or more linear polyester-ols and/or polyether-ols and molecular weight from 600 to 4,000,
- B. from 4 to 16 moles of a branched-chain diol of the formula ##STR8## in which R.sup.1 is alkyl of 1 to 4 carbon atoms and R.sup.2 is hydrogen or alkyl of 1 to 4 carbon atoms and optionally
- C. from 0.001 to 1 mole of an aliphatic triol, with
- D. from 5 to 18.5 moles of an aromatic diisocyanate of the formula ##STR9## in which X is methylene or a SO.sub.2 group and R and R' are hydrogen, chlorine and/or methyl, the ratio of the number of hydroxyl groups employed to the number of isocyanate groups being from about 1:1 to 1:108.
Dependencies are inferred from the claim text.