US4419480A
Expired / Lapsed
US
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Soft, fatigue resistant elastomer articles
Assignee: Michigan Technological University
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Filing: 1982-08-19
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Granted: 1983-12-06
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Expires: 2002-08-19
Abstract
Abstract A soft, fatigue resistant vulcanizate adapted for transmitting load between moving mechanical parts comprising (a) 100 parts by weight of crosslinked elastomer, (b) a fatigue life enhancing amount 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) about 5-200 parts by weight particulate comprising carbon black, said elastomer being crosslinked with (d) curative in an amount sufficient to crosslink said elastomer, 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.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:58
CPC Classifications
C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
112 words
A soft, fatigue resistant vulcanizate adapted for transmitting a load between moving mechanical parts comprising (a) 100 parts by weight crosslinked elastomer, (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, (c) about 5-200 parts by weight particulate comprising carbon black reinforcing particulate, said elastomer being crosslinked with (d) curative in an amount sufficient to crosslink said elastomer, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 2
Dependent Claim
112 words
A soft, fatigue resistant vulcanizate adapted for transmitting a load between moving mechanical parts comprising (a) 100 parts by weight crosslinked elastomer, (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, (c) about 5-200 parts by weight particulate comprising carbon black reinforcing particulate, said elastomer being crosslinked with (d) curative in an amount sufficient to crosslink said elastomer, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in a discrete microscopic phase.
Claim 3
Dependent Claim
12 words
A vulcanizate in accordance with claim 1, wherein said curative comprises sulfur.
Claim 4
Dependent Claim
29 words
A vulcanizate in accordance with claim 1, wherein said substantially internally uncrosslinked, substantially linear polymer comprises a polyisobutylene having a viscosity average molecular weight (Flory) of about 1.8-2.4 million.
Claim 5
Dependent Claim
19 words
A vulcanizate in accordance with claim 1, 2 or 3, wherein said elastomer comprises natural or synthetic polyisoprene rubber.
Claim 6
Dependent Claim
14 words
A vulcanizate in accordance with claim 4, wherein said elastomer further comprises bromobutyl rubber.
Claim 7
Dependent Claim
28 words
A vulcanizate in accordance with claim 5, wherein said elastomer comprises said polyisoprene rubber and bromobutyl rubber in a weight ratio of between about 100:1 and about 1:1.
Claim 8
Dependent Claim
17 words
A vulcanizate in accordance with claim 6, wherein said ratio is between about 7:3 and about 1:1.
Claim 9
Dependent Claim
28 words
A vulcanizate in accordance with claim 4, wherein said polymer of (b) is dispersed throughout said elastomer of (a) in an amount of about 15-35 parts by weight.
Claim 10
Dependent Claim
21 words
A vulcanizate in accordance with claim 1, wherein said particulate comprises 5-75 parts by weight of said carbon black reinforcing particulate.
Claim 11
Dependent Claim
102 words
A suspension bushing having a Shore A hardness below about 60, which comprises (a) 100 parts by weight crosslinked elastomer comprising natural or synthetic polyisoprene rubber; (b) a dispersed phase in said elastomer comprising about 15-35 parts by weight of substantially internally uncrosslinked, substantially linear polyisobutylene that is a strain crystallizable elastic solid at 20° C. and has a viscosity average molecular weight (Flory) of about 1.8-2.4, (c) sulfur crosslinks, and (d) about 20-80 parts by weight particulate filler consisting essentially of carbon black reinforcing particulate wherein said dispersed phase has particles of polymer of (b) below about 2 micrometers in diameter.
Claim 12
Dependent Claim
102 words
A suspension bushing having a Shore A hardness below about 60, which comprises (a) 100 parts by weight crosslinked elastomer comprising natural or synthetic polyisoprene rubber; (b) a dispersed phase in said elastomer comprising about 15-35 parts by weight of substantially internally uncrosslinked, substantially linear polyisobutylene that is a strain crystallizable elastic solid at 20° C. and has a viscosity average molecular weight (Flory) of about 1.8-2.4, (c) sulfur crosslinks, and (d) about 20-80 parts by weight particulate filler consisting essentially of carbon black reinforcing particulate wherein said dispersed phase has particles of polymer of (b) below about 2 micrometers in diameter.
Claim 13
Dependent Claim
15 words
A suspension bushing in accordance with claim 10, wherein said rubber comprises natural polyisoprene rubber.
Claim 14
Dependent Claim
17 words
A suspension bushing in accordance with claim 10 or 11, wherein said elastomer further comprises bromobutyl rubber.
Claim 15
Dependent Claim
30 words
A suspension bushing in accordance with claim 12, wherein said elastomer comprises said polyisoprene rubber and said bromobutyl rubber in a weight ratio of between about 100:1 and about 1:1.
Claim 16
Dependent Claim
17 words
A suspension bushing in accordance with claim 13, wherein said ratio is between about 7:3 and 1:1.
Claim 17
Dependent Claim
27 words
A suspension bushing in accordance with claim 10 or 11, wherein said dispersed phase comprises polyisobutylene having a viscosity average molecular weight (Flory) between about 2.0-2.2 million.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |