Polyurea composition

Patent metadata

Field	Value
Publication number	US-10189938-B2
Application number	US-201515518057-A
Country	US
Kind code	B2
Filing date	Oct 13, 2015
Priority date	Oct 13, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The invention relates to compositions comprising at least one first and one second component; —the first component K1 comprising at least one di(aminobenzoate) ester A1 of formula (I) with an average molecular weight of 500 g/mol to 2000 g/mol, preferably 600 g/mol to 1500 g/mol and particularly preferred between 650 g/mol and 1300 g/mol, G being a divalent group derived from poly(tetramethylene oxide) diol, and —the second component K2 comprising at least one aromatic polyisocyanate B1 with an average molecular weight of 160 g/mol to 1100 g/mol, preferably 500 g/mol to 800 g/mol.

First claim

What is claimed is:

1. A method comprising treating a substrate comprising an elastomeric material having unsaturated units with a curable composition, said treating selected from the group consisting of patching a defect in the substrate, coating the substrate, and adhesively bonding the substrate to another substrate, and said composition comprising at least, a first component and a second component, wherein
the first component K1 comprises
one or more than one di(aminobenzoate) ester A1 of formula (I)

with an average molecular weight of 500 g/mol to 2000 g/mol, where G is a divalent moiety deriving from poly(tetramethylene oxide) diol, and
the second component K2 comprises
one or more than one aromatic polyisocyanate B1 with an average molecular weight of 160 g/mol to 1100 g/mol, wherein the molar ratio between the isocyanate groups of the second component K2 and the isocyanate-reactive groups of the first component K1 is in the range from 1.3 to 1.0.

2. The method as claimed in claim 1 , wherein the polyisocyanate B1 has an NCO functionality of 2.0-4.

3. The method as claimed in claim 1 , wherein the aromatic polyisocyanate B1 comprises MDI and/or TDI.

4. The method as claimed in claim 1 , wherein the aromatic polyisocyanate B1 comprises carbodiimides or uretoneimines or urethanes of these polyisocyanates.

5. The method as claimed in claim 1 , wherein the second component contains 60 to 100 wt % of the aromatic polyisocyanate B1.

6. The method as claimed in claim 1 , wherein the aromatic polyisocyanate B1 comprises 95-100 mol % of all the isocyanate groups of the second component K2.

7. The method as claimed in claim 1 , wherein the second component K2 further contains at least one isocyanate-functional polyurethane polymer B2.

8. The method as claimed in claim 1 , wherein the di(aminobenzoate) ester A1 comprises a compound of formula (II)

where n is 9-14.

9. The method as claimed in claim 1 , wherein the di(aminobenzoate) ester A1 comprises a mixture of di(aminobenzoate) esters A1-1 having an average molecular weight of 700-1000 g/mol and di(aminobenzoate) esters A1-2 having an average molecular weight of 1100-1300 g/mol, wherein the mole ratio of A1-1/A1-2 is from 0.01-100.

10. The method as claimed in claim 1 , wherein the first component K1 further comprises an aliphatic polyetherdiamine A2 with an average molecular weight of 900 g/mol to 2100 g/mol, wherein the polyetherdiamine A2 comprises from 1-15 mole percent of the isocyanate-reactive groups of the first component K1.

11. The method as claimed in claim 1 , wherein the first component K1 further comprises an aliphatic polyetherdiol A3 with an average molecular weight of 600 g/mol to 1200 g/mol, wherein the polyetherdiol A3 represents 1-40 mole percent of the isocyanate-reactive groups of the first component K1.

12. The method as claimed in claim 1 , comprising patching a defect in the substrate and curing the composition.

13. The method as claimed in claim 1 , comprising coating the substrate and curing the composition.

14. The method as claimed in claim 1 , comprising adhesively bonding the substrate to another substrate and curing the composition.

15. The method as claimed in claim 1 , wherein the elastomeric material comprising unsaturated units comprises a polar, rubber-like material selected from the group consisting of rubber, EPDM, NBR, SBR, SBS and SIS.

16. The method as claimed in claim 1 , wherein the substrate is a transportation belt, a cushioning element or a tire.

17. The method as claimed in claim 1 , wherein the composition contains from 0 to less than 3 wt % of an aromatic polyamine having a molecular weight in the range of 60 to 500 g/mol.

18. The method as claimed in claim 17 , wherein the aromatic polyamine is selected from the group consisting of m-phenylenediamine, p-phenylenediamine, 4,4′-, 2,4′- and/or 2,2′-diaminodiphenylmethane, 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA), 2,4- and/or 2,6-tolylenediamine, mixtures of 3,5-dimethylthio-2,4- and -2,6-tolylenediamine, mixtures of 3,5-diethyl-2,4- and -2,6-tolylenediamine (DETDA), 3,3′,5,5′-tetraethyl-4,4′-diaminodiphenylmethane (M-DEA), 3,3′,5,5′-tetraethyl-2,2′-dichloro-4,4′-diaminodiphenylmethane (M-CDEA), 3,3′-diisopropyl-5,5′-dimethyl-4,4′-diaminodiphenylmethane (M-MIPA), 3,3′,5,5′-tetraisopropyl-4,4′-diaminodiphenylmethane (M-DIPA), 4,4′-diaminodiphenyl sulfone (DDS), 4-amino-N-(4-aminophenyl)benzene-sulfonamide, 5,5′-methylenedianthranilic acid, dimethyl (5,5′-methylenedianthranilate), 1,3-propylene-bis(4-aminobenzoate), 1,4-butylene-bis(4-aminobenzoate), 1,2-bis(2-aminophenyl-thio)ethane, and 2-methylpropyl 4-chloro-3,5-diaminobenzoate and tert-butyl 4-chloro-3,5-diaminobenzoate.

19. The method as claimed in claim 17 , wherein the composition contains 0-1 wt % of the aromatic polyamine.

20. The method as claimed in claim 17 , wherein the composition contains no aromatic polyamine.

Assignees

• Sika Tech Ag

Inventors

• Maier Steffen
• Huber Dominik
• Kelch Steffen

Classifications

• C09J175/02

  Polyureas · CPC title

• C08G18/6681

  with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 · CPC title

• C08G18/797

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

• C09D175/02

  Polyureas · CPC title

• C08G18/12

  using two or more compounds having active hydrogen in the first polymerisation step · CPC title