Patent US6548616B1 successfully refreshed from Google Patents.
US6548616B1
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US
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Lightweight tire support and composition and method for making a tire support
Assignee: Dow Global Technologies LLC
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Filing: 2000-12-13
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Granted: 2003-04-15
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Expires: 2020-12-13
Abstract
Abstract A polyurethane-polymer composition suitable for preparing a lightweight tire support includes at least one isocyanate, at least one polyol, and at least one chain extender. A polyurethane-polymer composition can also include an additive such as a catalyst, a filler, a surfactant, a colorant, and a mold-release agent. A lightweight tire support can be prepared from a polyurethane-polymer composition by, for example, reaction injection molding. Such a tire support desirably has temperature stability and load-bearing capability.
Inventors
- 👤 Alan K. Schrock
- 👤 Ralph D. Priester, Jr.
- 👤 Wayne R. Willkom
- 👤 Robert E. O'Neill
- 👤 Martin C. Cornell
- 👤 Christopher P. Christenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/6648; C08G18/6651; B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; B60; B60C; B60C17/00; B60C17/04; B60C17/06; C08G18/08; C08G18/10; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/4866; B29K; B29K2075/00; C08G2120/00; C08G2380/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10036; Y10T152/10054; Y10T152/10495; Y10T152/10522; Y10T152/10738
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
138 words
A lightweight tire support for use in a run flat tire, the light weight tire support being comprised of a polyurethane that is the reaction product of: (A) a polyol having a molecular weight of at least about 4500; (B) a chain extender; and (C) an isocyanate, the isocyanate being present in an amount effective to react with the chain extender to provide a hard-segment polymer and in an amount effective to react with the polyol to provide a soft-segment polymer such that the polyurethane has a tensile modulus that changes by no more than 15 percent over a temperature range of −50° C. and 150° C. based on dynamic mechanical spectroscopy and the tensile modulus is at least 20 MPa at 80° C. and no greater than 60 MPa at 80° C. as determined by ASTM D638.
Claim 2
Dependent Claim
138 words
A lightweight tire support for use in a run flat tire, the light weight tire support being comprised of a polyurethane that is the reaction product of: (A) a polyol having a molecular weight of at least about 4500; (B) a chain extender; and (C) an isocyanate, the isocyanate being present in an amount effective to react with the chain extender to provide a hard-segment polymer and in an amount effective to react with the polyol to provide a soft-segment polymer such that the polyurethane has a tensile modulus that changes by no more than 15 percent over a temperature range of −50° C. and 150° C. based on dynamic mechanical spectroscopy and the tensile modulus is at least 20 MPa at 80° C. and no greater than 60 MPa at 80° C. as determined by ASTM D638.
Claim 3
Dependent Claim
49 words
The lightweight tire support of claim 1 , wherein the isocyanate is present in an amount effective to react with the chain extender such that the hard-segment polymer is present in an amount of at least 25 weight to 45 weight percent based on the total weight of polyurethane.
Claim 4
Dependent Claim
21 words
The lightweight tire support of claim 1 , wherein the isocyanate is comprised of a first isocyanate and a second isocyanate.
Claim 5
Dependent Claim
45 words
The light weight tire support of claim 3 , wherein the first isocyanate is 4,4′-diphenylmethanediisocyanate, 2,4′-diphenylmethanediisocyanate, 2,2′-diphenylmethanediisocyanate or a mixture thereof and the second isocyanate is an isocyanate prepolymer of a polyol having a molecular weight of at least about 4500 and the first isocyanate.
Claim 6
Dependent Claim
25 words
The light weight tire support of claim 1 , wherein the isocyanate has an NCO content of from 6 weight percent to 15 weight percent.
Claim 7
Dependent Claim
15 words
The lightweight tire support of claim 1 , wherein the polyol is a polyether polyol.
Claim 8
Dependent Claim
23 words
The light weight tire support of claim 6 , wherein said polyether polyol is polypropylene oxide, polybutylene oxide, polyethylene oxide, and polytetramethylene oxide.
Claim 9
Dependent Claim
36 words
The lightweight tire support of claim 7 , wherein the polyol comprises a first polyol and a second polyol, the first polyol being a polypropylene oxide polyol and the second polyol being an ethylene oxide-capped polyol.
Claim 10
Dependent Claim
29 words
The lightweight tire support of claim 1 , wherein the chain extender is an aliphatic amine chain extender, an aromatic amine chain extender, or a modified amine chain extender.
Claim 11
Dependent Claim
17 words
The lightweight tire support of claim 9 , wherein said chain extender is 3,5-diethyl-2,4- or 2,6′-toluene diamine.
Claim 12
Dependent Claim
34 words
The lightweight tire support of claim 1 further comprising at least one of a catalyst, a filler, a fire retardant, a colorant, an antistatic agent, a reinforcing fiber, an antioxidant, and an acid scavenger.
Claim 13
Dependent Claim
38 words
The lightweight tire support of claim 1 , wherein the polyurethane has a tensile modulus that changes by no more than 10 percent over a temperature range of −50° C. and 150° C. based on dynamic mechanical spectroscopy.
Claim 14
Dependent Claim
38 words
The lightweight tire support of claim 12 , wherein the polyurethane has a tensile modulus that changes by no more than 8 percent over a temperature range of −50° C. and 150° C. based on dynamic mechanical spectroscopy.
Claim 15
Dependent Claim
55 words
The light weight tire support of claim 13 , wherein said tire support has a change in tensile modulus over a temperature range of −50° C. and 150° C. substantially similar to a rubber tire support's change in tensile modulus over a temperature range of −50° C. and 150° C. based on dynamic mechanical spectroscopy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-04-14 | 2006-10-14 | 2007-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-14 | 2010-10-14 | 2011-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-14 | 2014-10-14 | 2015-04-15 | $7700.00 | Window Closed / Lapsed |