Storage stable polyol composition for polyurethane elastomers

Patent metadata

Field	Value
Publication number	US-9873758-B2
Application number	US-201415029082-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Dec 2, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A polyurethane reaction system includes an isocyanate component having at least one polyisocyanate and an isocyanate-reactive component having a storage stable polyol component that is a single phase liquid mixture at 23° C. including a first polyether polyol and a second polyether polyol. The first polyether polyol is included in an amount from 20 wt % to 90 wt %, based on total weight of the polyol component, is a glycol based polyoxypropylene-polyoxyethylene polyether polyol having number average molecular weight from 1500 g/mol to 1975 g/mol, and has a polyoxyethylene content from 26 wt % and 34 wt % based on a total weight of the first polyether polyol. The second polyether polyol is included in an amount from 10 wt % to 80 wt %, based on total weight of the polyol component, has a number average molecular weight from 750 g/mol to 4000 g/mol, and has a melting point higher than 23° C.

First claim

The invention claaimed is:

1. A polyurethane reaction system, comprising
an isocyanate component that includes at least one polyisocyanate
an isocyanate-reactive component that includes a storage stable polyol component having a single phase liquid mixture at 23° C. including:
a first polyether polyol in an amount from 20 wt % to 90 wt %, based on total weight of the polyol component, the first polyether polyol being a glycol based polyoxypropylene-polyoxyethylene polyether polyol having number average molecular weight from 1500 g/mol to 1975 g/mol and a polyoxyethylene content from 26 wt % to 34 wt % based on a total weight of the first polyether polyol, and
a second polyether polyol in an amount from 10 wt % to 80 wt %, based on total weight of the polyol component, the second polyether polyol having a number average molecular weight from 750 g/mol to 4000 g/mol and a melting point higher than 23° C.,

wherein a cured reaction product of the isocyanate component and the isocyanate-reactive component has a Shore A hardness greater than 60 as measured according to ASTM D-2240, an ultimate tensile strength greater than 4500 psi as measured according to ASTM D-638, and a compression set at 23° C. of less than 15% as measured according to ASTM D-395B.

2. The polyurethane reaction system as claimed in claim 1 , wherein the first polyether polyol and the second polyether polyol account for a 100 wt % of a total amount of polyols in the isocyanate-reactive component.

3. The polyurethane reaction system as claimed in claim 1 , wherein the second polyether polyol is a poly(tetramethylene ether) glycol.

4. The polyurethane reaction system as claimed in claim 1 , wherein the second polyether polyol consists essentially of a poly(tetramethylene ether) glycol having a number average molecular weight from 980 g/mol to 2020 g/mol.

5. The polyurethane reaction system as claimed in claim 1 , wherein the melting point of the second polyether polyol is between 24° C. and 34 ° C.

6. The polyurethane reaction system as claimed in claim 1 , wherein the cured reaction product has a 300% tensile strength of at least 800 psi as measured according to ASTM D-638, a percent elongation at break @ 23° C. of at least 1500% as measured according to ASTM D-638, and a glass transition temperature that is below 0° C.

7. The polyurethane reaction system as claimed in claim 1 , wherein the first polyether polyol has a monol content of less than 0.0200 meq/g.

8. The polyurethane reaction system as claimed in claim 1 , wherein the isocyanate component is mixed with the isocyanate-reactive component without pre-heating the isocyanate-reactive component.

9. A polyurethane product having the Shore A hardness greater than 60 as measured according to ASTM D-2240, the ultimate tensile strength greater than 4500 psi as measured according to ASTM D-638, and the compression set at 23° C. of less than 15% as measured according to ASTM D-395B, the polyurethane product being prepared with the polyurethane reaction system as claimed in claim 1 .

10. A method of manufacturing a polyurethane product having the Shore A hardness greater than 60 as measured according to ASTM D-2240, the ultimate tensile strength greater than 4500 psi as measured according to ASTM D-638, and the compression set at 23° C. of less than 15% as measured according to ASTM D-395B, the method comprising preparing the polyurethane reaction system as claimed in claim 1 , without pre-heating the isocyanate-component prior to mixing the isocyanate component and the isocyanate-reactive component.

Assignees

• Dow Global Technologies Llc

Inventors

• Claessens Sven
• Virgili Justin M
• De Smet Antoon
• Braaksma Yme
• Sonnenschein Mark F
• Wendt Benjamin L

Classifications

• C08G18/797

  containing carbodiimide and/or uretone-imine groups · CPC title

• C08G18/2063

  having two nitrogen atoms in the condensed ring system · CPC title

• C08G18/4808 Primary

  Mixtures of two or more polyetherdiols · CPC title

• C08G18/4854

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

• C08G18/7657

  containing two or more aromatic rings · CPC title