TPU pneumatic tubes made with mono ethyleneglycol as chain extender for high temperature use

Patent metadata

Field	Value
Publication number	US-11168175-B2
Application number	US-201615763146-A
Country	US
Kind code	B2
Filing date	Sep 20, 2016
Priority date	Sep 24, 2015
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

The present invention relates to a thermoplastic polyurethane obtainable or obtained by the conversion of at least a polyisocyanate composition, ethane-1,2-diol as chain extender and a polyol composition, wherein no further chain extender is used aside from ethane-1,2-diol, to a process for preparing such a thermoplastic polyurethane, and to the use of such a polyurethane for production of injection molded products, extrusion products, films and shaped bodies.

First claim

The invention claimed is:

1. A thermoplastic polyurethane obtained by conversion of at least components (i) to (iii):
(i) a polyisocyanate composition comprising methylene diphenyl diisocyanate (MDI);
(ii) ethane-1,2-diol as chain extender; and
(iii) a polyol composition comprising two or more polyols at least comprising polytetrahydrofuran (PTHF) and a further polyol selected from polyethers, polyesters, block copolymers and hybrid polyols,
wherein no further chain extender is present aside from the ethane-1,2-diol,
wherein the polyol used has a molecular weight Mn ranging from 500 g/mol to 1500 g/mol, and
wherein a molar ratio of sum total of functionalities of the polyol composition and the chain extender to sum total of functionalities of the polyisocyanate composition ranges from 1:08 to 1:1.3.

2. The thermoplastic polyurethane according to claim 1 , wherein said further polyol is at least one polyether selected from the group consisting of a polyethylene glycol and a polypropylene glycol.

3. The thermoplastic polyurethane according to claim 1 , wherein the polyol composition comprises a polytetrahydrofuran having a molecular weight Mn ranging from 650 g/mol to 1400 g/mol.

4. The thermoplastic polyurethane according to claim 1 , wherein the polyisocyanate composition further comprises at least one polyisocyanate selected from the group consisting of hexamethylene 1,6-diisocyanate (HDI), 4,4′-methylene dicyclohexyl diisocyante, 2,4′-methylene dicyclohexyl diisocyanate and 2,2′-methylene dicyclohexyl diisocyanate (H12MDI).

5. The thermoplastic polyurethane according to claim 1 , wherein said further polyol is at least one polyester selected from the group consisting of a polyadipate and a polycaprolactone.

6. The thermoplastic polyurethane according to claim 1 , wherein an isocyanate index in the conversion ranges from 965 to 1100.

7. The thermoplastic polyurethane according to claim 1 , wherein the thermoplastic polyurethane has a Shore hardness ranging from 60 A to 80 D, determined according to DIN 53505.

8. A process for preparing a thermoplastic polyurethane, the process comprising converting components (i) to (iii)
(i) a polyisocyanate composition comprising methylene diphenyl diisocyanate (MDI);
(ii) ethane-1,2-diol as chain extender; and
(iii) a polyol composition comprising two or more polyols at least comprising polytetrahydrofuran (PTHF) and a further polyol selected from polyethers, polyesters, block copolymers and hybrid polyols,
wherein no further chain extender is present aside from the ethane-1,2-diol,
wherein the polyol used has a molecular weight Mn ranging from 500 g/mol to 1500 g/mol, and
wherein a molar ratio of sum total of functionalities of the polyol composition and the chain extender to sum total of functionalities of the polyisocyanate composition ranges from 1:0.8 to 1:1.3.

9. A product formed from the thermoplastic polyurethane of claim 1 , the product being selected from the group consisting of a molded product, an extrusion product, a film and a shaped body.

10. The product according to claim 9 , which is a shaped body in the form of a hose.

11. A hose, comprising the thermoplastic polyurethane according to claim 1 .

12. The thermoplastic polyurethane according to claim 1 , wherein the polyisocyanate composition further comprises at least one aromatic diisocyanate.

13. The thermoplastic polyurethane according to claim 1 , wherein:
the polyisocyanate composition further comprises an aromatic diisocyanate selected from the group consisting of naphthylene 1,5-diisocyanate (NDI), tolylene 2,4-diisocyanate, 2,6-diisocyanate, 3,3′-dimethyl-4,4′-diisocyanatodiphenyl (TODI), p-phenylene diisocyanate (PDI), diphenylethane 4,4′-diisocyanate (EDI), diphenylmethane diisocyanate, dimethyl diphenyl 3,3′-diisocyanate, diphenylethane 1,2-diisocyanate and phenylene diisocyanate.

14. The thermoplastic polyurethane according to claim 1 , wherein the polyisocyanate composition consists of methylene diphenyl diisocyanate (MDI).

15. The process according to claim 8 , wherein:
the polyisocyanate composition further comprises an aromatic diisocyanate selected from the group consisting of naphthylene 1,5-diisocyanate (NDI), tolylene 2,4-diisocyanate, 2,6-diisocyanate, 3,3′-dimethyl-4,4′-diisocyanatodiphenyl (TODI), p-phenylene diisocyanate (PDI), diphenylethane 4,4′-diisocyanate (EDI), diphenylmethane diisocyanate, dimethyl diphenyl 3,3′-diisocyanate, diphenylethane 1,2-diisocyanate and phenylene diisocyanate.

16. The thermoplastic polyurethane according to claim 1 , wherein said further polyol is polyester polyol which is a polycarbonate (diol).

Assignees

• Basf Se

Inventors

• Poeselt Elmar
• Kempfert Dirk

Classifications

• C08G18/244

  tin salts of carboxylic acids · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C08G18/664

  with compounds of group C08G18/3203 · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08G18/4854 Primary

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title