Tire bonding systems

• US 5,462,617 A
• Filed: 05/24/1994
• Issued: 10/31/1995
• Est. Priority Date: 05/30/1991
• Status: Expired due to Fees

• Current Assignee: Bandag Licensing Corporation
• Original Assignee: Bandag Licensing Corporation
• Inventors: Bryan, William C., Carlson, Laurence, Fox, Charles E., Brugman, William, Bender, David L.
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Stemmer, Daniel J.
• Application Number:
  US08/248,526
• Time in Patent Office: 525 Days
• Field of Search: 156/95, 156/96, 156/97, 156/307.3, 156/314, 156/331.4, 156/909
• US Class Current: 156/96
• CPC Class Codes: B29D 2030/0011 Surface activation of tyres or parts thereof, e.g. by plasma treatment
• CPC Class Codes: B29D 2030/544 Applying an intermediate adhesive layer, e.g. cement or cushioning element between carcass and tread
• CPC Class Codes: B29D 30/54 Retreading
• 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 18/3203 Polyhydroxy compounds
• CPC Class Codes: C08G 2380/00 Tyres
• CPC Class Codes: C08J 2321/00 Characterised by the use of unspecified rubbers
• CPC Class Codes: C08J 5/124 using adhesives based on a macromolecular component
• CPC Class Codes: C08J 7/126 Halogenation
• CPC Class Codes: C09J 175/04 Polyurethanes

Abstract

A method and adhesive system for bonding at least two elastomeric substrates together. The method comprises subjecting the substrates to a priming treatment followed by applying to the primed substrates a heat-curable polyurethane adhesive composition comprising an isocyanate-terminated prepolymer and a polyhydroxide compound. The surfaces of the substrates so treated are contacted and subjected to heat-curing to bond the substrates together.

Claims

1. A method for bonding at least two elastomeric substrates together, wherein one of said substrates is a tire casing and another substrate is a tire tread, said method comprising the steps of:

subjecting said substrate to a priming treatment with a priming agent selected from the group consisting of a N-halohydantoin, N-halosulfonamide, a N-haloamide and a N-haloimide to form a primed substrate;

applying a heat-curable polyurethane adhesive composition to said primed substrate, said adhesive composition comprising a polyhydroxide compound curing agent and an aromatic isocyanate-terminated prepolymer, said aromatic isocyanate-terminated prepolymer being prepared by reacting an aromatic polyisocyanate with a compound selected from the group consisting of a polyether polyol and a polyester polyol;

contacting said substrates; and

heat-curing said contacted substrates under superatmospheric pressure to bond said substrates together.

2. A method according to claim 1, wherein said priming agent is a N-halohydantoin.

3. A method according to claim 2, wherein said N-halohydantoins is selected from the group consisting of 1,3-dichloro-5,5-dimethylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5-methyl-5-isobutylhydantoin and 1,3-dichloro-5-methyl-5-hexylhydantoin.

4. A method according to claim 3, wherein said N-halohydantoin is 1,3-dichloro-5,5-dimethylhydantoin.

5. A method according to claim 4, wherein said 1,3-dichloro-5,5-dimethylhydantoin is in the form of a solution in organic solvent.

6. A method according to claim 5, wherein said 1,3-dichloro-5,5-dimethylhydantoin is in the form of an approximately 1 to 5 weight percent solution in dichloromethane.

7. A method according to claim 1, wherein said N-sulfonamides is selected from the group consisting of N,N,N'"'"'.N'"'"'-tetrachloro-oxybis(benzene sulfonamides), N,N,N'"'"', N'"'"'-tetrachloro-4,4-biphenol disulfonamides, N,N,N'"'"', N'"'"'-tetrachloro-1,3-benzene disulfonamide and N,N,N'"'"',N'"'"'-tetrabromo-oxy-bis(benzene) sulfonamides.

8. A method according to claim 1, wherein said N-haloamide is selected from the group consisting of N-bromoacetamide and tetrachloroglycoluril.

9. A method according to claim 1, wherein said N-haloimide is selected from the group consisting of N-bromosuccinimide and mono-, di- and trichloroisocyanuric acids.

10. A method according to claim 1, wherein said prepolymer is a substantially liquid phase and said polyhydroxide compound is a solid phase insoluble in and disposed throughout said substantially liquid phase.

11. A method according to claim 1, wherein said curing is carried out at a curing temperature of 140°

F. to 400°

F.

12. A method according to claim 11, wherein said curing temperature is 210°

F. to 250°

F.

13. A method according to claim 1, wherein the ratio of OH groups in the solid and soluble

14. A method according to claim 13, wherein said OH/NCO ratio is about 0.5:

1 to 1.8;

1.

15. A method according to claim 1, wherein said pressure is about 80 to 100 PSI relative.

16. A method for bonding at least two rubber substrates together, wherein one of said substrates is a tire casing and another said substrate is a precured tire tread, said method comprising the steps of:

applying to said substrates a halogen-containing priming agent selected from the group consisting of a N-halohydantoin, a N-halosulfonamide, a N-haloamide and a N-haloimide;

applying a heat-curable polyurethane adhesive composition to said priming agent coated substrates, said composition comprising a polyhydroxide compound curing agent and an isocyanate-terminated prepolymer, said isocyanate-terminated prepolymer being prepared by reacting an aromatic polyisocyanate with the compound selected from the group consisting of a polyether polyol and a polyester polyol;

contacting said substrates; and

heat-curing said contacted substrates under superatmospheric pressure to bond said substrates together.