Physical property improvement of polyurethanes

Patent metadata

Field	Value
Publication number	US-11267929-B2
Application number	US-201816472443-A
Country	US
Kind code	B2
Filing date	Jan 12, 2018
Priority date	Jan 12, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

100% solids polyurethanes having improved physical properties in terms of Shore hardness, tear strength, elongation at break and/or tensile strength are realized through the introduction of 100% solids hydroxyl-functional acrylics in combination with the hydroxyl-functional polyether and 100% solids isocyanate-functional compounds. When an aromatic isocyanate is used, the isocyanate-reactive component includes from 5 to 70% by weight of a hydroxyl-functional polyether having a weight average molecular weight ranging from 180 to 6,500 g/mol, and 30 to 95% by weight of a hydroxyl-functional acrylic. When an aliphatic isocyanate is used, the isocyanate-reactive component includes from 40 to 70% by weight of a hydroxyl-functional polyether having a weight average molecular weight ranging from 180 to 6,500 g/mol, and 30 to 60% by weight of a hydroxyl-functional acrylic.

First claim

What is claimed is:

1. A polyurethane comprising the reaction product of reactants comprising:
a 100% solids isocyanate-reactive component having hydroxyl-functional groups, said isocyanate-reactive component comprising:
30 to 95% by weight of a hydroxyl-functional polyether having a weight average molecular weight ranging from 180 to 6,500 g/mol, and
5 to 70% by weight of a hydroxyl-functional acrylic,
wherein said % by weight is based on the total weight of said hydroxyl-functional polyether and said hydroxyl-functional acrylic; and

a 100% solids aromatic isocyanate component having isocyanate-functional groups reactive with said hydroxyl-functional groups,
wherein the molar ratio of said isocyanate-functional groups in said aromatic isocyanate component to said hydroxyl-functional groups in said isocyanate-reactive component ranges from 0.95:1 to 1.05:1.

2. The polyurethane of claim 1 , wherein said hydroxyl-functional polyether has weight average molecular weight ranging from 400 to 3,000 g/mol.

3. The polyurethane of claim 1 , wherein said aromatic isocyanate component comprises methylene diphenyl diisocyanate (MDI) or toluene diisocyanate (TDI).

4. The polyurethane of claim 1 , wherein the hydroxyl-functional polyether comprises a copolymer formed as a polymeric reaction product of an organic oxide and an initiator compound containing two or more active hydrogen atoms.

5. The polyurethane of claim 1 as a coating.

6. The polyurethane of claim 1 as an adhesive.

7. The polyurethane of claim 1 as a sealant.

8. The polyurethane of claim 1 as an elastomer.

9. A method for improving the physical properties of polyurethanes formed as the reaction product of a 100% solids hydroxyl-functional polyether and a 100% solids isocyanate component having isocyanate-functional groups, said method comprising;
mixing 100% solids hydroxyl-functional acrylic and the 100% solids hydroxyl-functional polyether to form a 100% solids isocyanate-reactive component having hydroxyl-functional groups; and
reacting the hydroxyl-functional groups of the 100% solids isocyanate-reactive component with the isocyanate-functional groups of the 100% solids isocyanate component to form the polyurethane,
wherein the 100% solids isocyanate component having isocyanate-functional groups comprises an aromatic isocyanate component and wherein the isocyanate-reactive component comprises:
30 to 95% by weight of a hydroxyl-functional polyether having a weight average molecular weight ranging from 180 to 6,500 g/mol, and
5 to 70% by weight of an hydroxyl-functional acrylic,
wherein the % by weight is based on the total weight of the hydroxyl-functional polyether and the hydroxyl-functional acrylic, and
wherein the molar ratio of isocyanate-functional groups in the aromatic isocyanate component to hydroxyl-functional groups in the isocyanate-reactive component ranges from 0.95:1 to 1.05:1.

10. The method of claim 9 , further comprising:
forming a 100% solids hydroxyl-functional acrylic using a solid grade oligomer process.

Assignees

• Basf Se

Inventors

• Praw Michael
• May Micheal Colin

Classifications

• C08G2190/00

  Compositions for sealing or packing joints · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C08L75/08

  from polyethers · CPC title

• C08G18/485

  containing mixed oxyethylene-oxypropylene or oxyethylene-higher oxyalkylene end groups · CPC title

• C08G18/4816 Primary

  mixtures of two or more polyetherpolyols having at least three hydroxy groups · CPC title