Polyurethaneurea system

• US 8,261,798 B2
• Filed: 04/30/2008
• Issued: 09/11/2012
• Est. Priority Date: 10/30/2006
• Status: Active Grant

• Current Assignee: Compagnie Generale DES Etablissements Michelin SCA
• Original Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Inventors: Laubry, Philippe, Proner, Pete, Battocchio, Claudio, Hightower, Brian B., Martin, S. Todd
• Primary Examiner(s): Del Sole, Joseph
• Assistant Examiner(s): Brown, II, David N
• Application Number:
  US12/112,915
• Publication Number:
  US 20080264541A1
• Time in Patent Office: 1,595 Days
• Field of Search: 152/565, 152/367, 156/97
• US Class Current: 152/565
• CPC Class Codes: B29D 30/54 Retreading
• CPC Class Codes: B60C 1/0008 Compositions of the inner liner
• CPC Class Codes: B60C 11/02 Replaceable treads
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 5/14 with impervious liner or coating on the inner wall of the tyre
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/3865 containing groups having one sulfur atom between two carbon atoms
• CPC Class Codes: C08G 18/6685 with compounds of group C08G18/3225 or polyamines of C08G18/38
• CPC Class Codes: C08G 18/797 containing carbodiimide and/or uretone-imine groups
• CPC Class Codes: Y10T 152/10882 Patches

Abstract

A polyurethaneurea system that includes in some embodiments Parts A and B reaction components for a polyurethaneurea, wherein an exemplary embodiment provides a Part A that comprises between 55 and 75 wt. % of an oligomeric polyol, between 3 and 7 wt. % of an aromatic diamine chain extender, and between 0.1 and 1.5% of a reactivity catalyst; Part B includes between 1 and 15 wt. % of a short aromatic diisocyanate and between 5 and 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol. The polyurethaneurea system may further comprise an elastomer-surface activator comprising a second short aromatic diisocyanate and a second aromatic diisocyanate prepolymer, wherein at least one of the second diisocyanates may be the same as at least one of the diisocyanates of Part B.

Claims

1. A tire for a vehicle, comprising:

an inner liner having an elastomer content that is in majority a butyl based rubber;

a patch bonded to the inner liner, the patch having a bonding surface having an elastomer content that is in majority a diene rubber;

a polyurethaneurea adhesive bonding the bonding surface of the patch to the inner liner, the polyurethaneurea adhesive is the reaction product of reaction components, the reaction components comprising;

part A, wherein part A is a mixture comprising;

between about 55 and about 75 wt. % of an oligomeric polyol having an average molecular weight greater than about 1000 wherein greater than 75 wt. % of the oligomeric polyols is primary oligomeric polyol;

between about 3 and about 7 wt. % of an aromatic diamine chain extender; and

between about 0.1 and about 1.5 wt. % of a reactivity catalyst; and

part B, wherein part B is a mixture comprising;

between about 1 and about 15 wt. % of a short aromatic diisocyanate; and

between about 5 and about 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol, wherein the mass fraction of each of the reaction components is based upon the total mass of the part A and part B reaction components.

2. The tire of claim 1, wherein the oligomeric polyol comprises greater than about 95 wt. % primary oligomeric polyol.

3. The tire of claim 1, wherein one or both of the inner liner surface and the mounting surface of the patch are treated surfaces, the treated surfaces treated with an elastomer-surface activator comprising a second short aromatic diisocyanate and a second aromatic diisocyanate prepolymer.

4. The tire of claim 3, wherein at least one of the second diisocyanates of claim 3 is the same as at least one of the diisocyanates of claim 1.

5. The tire of claim 3, wherein the elastomer-surface activator includes between 0 and 90 wt. % of the short aromatic diisocyanate, wherein the mass fraction is based upon the total mass of the diisocyanates in the elastomer-surface activator.

6. The tire of claim 5, wherein the elastomer-surface activator includes between 5 and 80 wt. % of the short aromatic diisocyanate.

7. The tire of claim 1, wherein the short aromatic diisocyanate is a polycarbodiimide-modified diphenylmethane diisocyanate.

8. The tire of claim 1, wherein the short aromatic diisocyanate is selected from 2, 4 and/or 2,6 toluene diisocyanate (TDI), 4,4′

-diphenyl-methane diisocyanate (MDI), polymeric MDI, modified MDI compounds, naphthalene diisocyanate (NDI) or combinations thereof.

9. The tire of claim 1, wherein the aromatic diisocyanate prepolymer is an MDI-terminated polyether diisocyanate.

10. The tire of claim 1, wherein the aromatic diisocyanate prepolymer is the reaction product of the diol that is selected from a polyether-based diol, a polyester-based diol or combinations thereof.

11. The tire of claim 1, wherein the oligomeric polyol is a polytetramethyleneglycol having an average molecular weight between about 1500 and about 4000.

12. The tire of claim 1, wherein the aromatic diamine chain extender is a mixture of 2,4 and 2,6 isomers of dimethylthiotoluenediamine.

13. The tire of claim 1, wherein a ratio of isocyanate functionalities to a total of the amine and hydroxyl functionalities in a mixture of part A and part B is between 0.8 and 2.

14. The tire of claim 13, wherein the ratio of isocyanate functionalities to the total of the amine and hydroxyl functionalities in the mixture of part A and part B is between 1.0 and 1.07.

15. The tire of claim 1, wherein the elastomer content of the patch bonding surface and the inner liner of the tire is between 90 and 100 wt. % bromobutyl rubber.

16. The tire of claim 1, wherein the patch further comprises:

an electronic component.

17. The tire of claim 16, wherein the electronic component is a piezoelectric device.

18. The tire of claim 16, wherein the component comprises an RFID chip.

19. The tire of claim 16, wherein the article comprises a transmitter and an antenna.