US4362840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft, heat and fatigue resistant elastomeric articles
Assignee: Ford Motor Co
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Filing: 1980-10-01
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Granted: 1982-12-07
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Expires: 2000-10-01
Abstract
Abstract A soft, heat and fatigue resistant vulcanizate adapted for transmitting load between moving mechanical parts comprising (a) 100 parts by weight of crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric polybutadiene made from monomers consisting essentially of butadiene at a weight ratio of (i) to (ii) of about 1:10 to 10:1, (b) about 10-75 parts by weight of substantially internally saturated, substantially linear polymer that (i) is made from monomers consisting essentially of isobutylene, (ii) is a strain crystallizable, elastic solid at 20° C. and (iii) has a viscosity average molecular weight (Flory) above about 1.3 million, (c) said elastomer being crosslinked with a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said crosslinkable elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said crosslinkable elastomer and (iii) isocyanate or blocked isocyanate and sulfur in amounts sufficient to crosslink said crosslinkable elastomer and (d) 5-200 parts by weight particulate comprising carbon black, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Inventors
- 👤 Ronald J. Tabar
- 👤 Paul C. Killgoar, Jr.
- 👤 Marvin A. Lemieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:01
CPC Classifications
C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
193 words
A soft, heat and fatigue resistant vulcanizate adapted for transmitting a load between moving mechanical parts comprising (a) 100 parts by weight crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric polybutadiene made from monomers consisting essentially of butadiene at a weight ratio of (i) to (ii) of about 1:10-10:1, (b) about 10-75 parts by weight of substantially internally uncrosslinked, substantially linear polymer that (i) is made from monomers consisting essentially of isobutylene, (ii) is a strain crystallizable, elastic solid at 20° C. and (iii) has a viscosity average molecular weight (Flory) above about 1.3 million, said elastomer being crosslinked with (c) a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said elastomer and (iii) isocyanate or blocked isocyanate and sulfur in an amount sufficient to crosslink said elastomer and (d) 5-200 reinforcing particulate parts by weight particulate comprising carbon black wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 2
Dependent Claim
193 words
A soft, heat and fatigue resistant vulcanizate adapted for transmitting a load between moving mechanical parts comprising (a) 100 parts by weight crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric polybutadiene made from monomers consisting essentially of butadiene at a weight ratio of (i) to (ii) of about 1:10-10:1, (b) about 10-75 parts by weight of substantially internally uncrosslinked, substantially linear polymer that (i) is made from monomers consisting essentially of isobutylene, (ii) is a strain crystallizable, elastic solid at 20° C. and (iii) has a viscosity average molecular weight (Flory) above about 1.3 million, said elastomer being crosslinked with (c) a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said elastomer and (iii) isocyanate or blocked isocyanate and sulfur in an amount sufficient to crosslink said elastomer and (d) 5-200 reinforcing particulate parts by weight particulate comprising carbon black wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 3
Dependent Claim
17 words
A vulcanizate in accordance with claim 1, wherein said curative comprises isocyanate or blocked isocyanate and sulfur.
Claim 4
Dependent Claim
14 words
A vulcanizate in accordance with claim 2, wherein said weight ratio is about 1:4-4:1.
Claim 5
Dependent Claim
18 words
A vulcanizate in accordance with claim 1, 2 or 3, wherein said substantially internally uncrosslinked polymer is polyisobutylene.
Claim 6
Dependent Claim
12 words
A vulcanizate in accordance with claim 1, wherein said polybutadiene comprises cis-polybutadiene.
Claim 7
Dependent Claim
14 words
A vulcanizate in accordance with claim 5, wherein said polyisoprene rubber is natural rubber.
Claim 8
Dependent Claim
22 words
A vulcanizate in accordance with claim 6 wherein said viscosity average molecular weight (Flory) ranges from about 1.8 to about 2.4 million.
Claim 9
Dependent Claim
179 words
A suspension bushing having a Shore A hardness below about 60; which comprises (a) 100 parts by weight crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric cis-polybutadiene at a weight ratio of (i) to (ii) of about 1:4-4:1, (b) about 15-35 parts by weight of substantially internally saturated, terminally unsaturated and substantially linear polyisobutylene that is a strain crystallizable, elastic solid at 20° C. and has a viscosity average molecular weight (Flory) above about 1.5 million, said elastomer being crosslinked with (c) a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said crosslinkable elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said crosslinkable elastomer and (iii) isocyanate or blocked isocyanate and sulfur in an amount sufficient to crosslink said crosslinkable elastomer and (d) reinforcing particulate comprising about 20-80 parts by weight carbon black reinforcing particulate, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 10
Dependent Claim
179 words
A suspension bushing having a Shore A hardness below about 60; which comprises (a) 100 parts by weight crosslinked elastomer consisting essentially of (i) natural or synthetic polyisoprene rubber, and (ii) elastomeric cis-polybutadiene at a weight ratio of (i) to (ii) of about 1:4-4:1, (b) about 15-35 parts by weight of substantially internally saturated, terminally unsaturated and substantially linear polyisobutylene that is a strain crystallizable, elastic solid at 20° C. and has a viscosity average molecular weight (Flory) above about 1.5 million, said elastomer being crosslinked with (c) a curative comprising a curing agent selected from the group consisting of (i) a sufficient amount of sulfur to provide an efficient or semi-efficient vulcanization of said crosslinkable elastomer, (ii) isocyanate or blocked isocyanate in an amount sufficient to crosslink said crosslinkable elastomer and (iii) isocyanate or blocked isocyanate and sulfur in an amount sufficient to crosslink said crosslinkable elastomer and (d) reinforcing particulate comprising about 20-80 parts by weight carbon black reinforcing particulate, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 11
Dependent Claim
18 words
A suspension bushing in accordance with claim 8 wherein said curative comprises sulfur and isocyanate or blocked isocyanate.
Claim 12
Dependent Claim
34 words
A suspension bushing in accordance with claim 9 wherein said substantially internally saturated, substantially internally saturated, substantially linear polymer comprises a polyisobutylene with a viscosity average molecular weight (Flory) of between about 1.9-2.1 million.
Claim 13
Dependent Claim
20 words
A suspension bushing in accordance with claim 8, wherein said suspension bushing has a Shore A hardness of about 40-50.
References Cited (Backward Citations)
US2160204A
Cited
US2160996A
Cited
US2184966A
Cited
US2202363A
Cited
US2138895A
Cited
US2218167A
Cited
US2330698A
Cited
US2194958A
Cited
US2373613A
Cited
US2253255A
Cited
US3060989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |