Patent US4215021A successfully refreshed from Google Patents.
US4215021A
Expired / Lapsed
US
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Coating rubber composition for tire cords
Assignee: Bridgestone Corp
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Filing: 1979-04-05
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Granted: 1980-07-29
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Expires: 1999-04-05
Abstract
Abstract A coating rubber composition for tire cords is disclosed. This composition is an unvulcanized rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10μ and an average diameter of less than 1μ and 30-120 parts by weight of carbon black, on a basis of 100 parts by weight of a rubber, and has a swelling value of not more than 140% in the extrusion at 100° C.
Inventors
- 👤 Masaki Ogawa
- 👤 Tamio Araki
- 👤 Shinji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:17
CPC Classifications
C; C08; C08L; C08L21/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10513; Y10T152/10765; Y10T152/1081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A coating rubber composition for tire cords, obtained by an unvulcanized rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10μ and an average diameter of less than 1μ and 30-120 parts by weight of carbon black, on a basis of 100 parts by weight of a rubber selected from natural rubbers, synthetic rubbers and blends thereof in an optional blending ratio; said composition having a swelling value of not more than 140% in the extrusion at 100° C.
Claim 2
Dependent Claim
90 words
A coating rubber composition for tire cords, obtained by an unvulcanized rubber composition comprising 3-40 parts by weight of short fibers of syndiotactic-1,2-polybutadiene having a maximum diameter of not more than 10μ and an average diameter of less than 1μ and 30-120 parts by weight of carbon black, on a basis of 100 parts by weight of a rubber selected from natural rubbers, synthetic rubbers and blends thereof in an optional blending ratio; said composition having a swelling value of not more than 140% in the extrusion at 100° C.
Claim 3
Dependent Claim
27 words
A coating rubber composition as claimed in claim 1, wherein each of said short fibers of syndiotactic-1,2-polybutadiene has a 1,2-structure unit content of not less than 80%.
Claim 4
Dependent Claim
27 words
A coating rubber composition as claimed in claim 1, wherein each of said short fibers of syndiotactic-1,2-polybutadiene has a melting point of not less than 190° C.
Claim 5
Dependent Claim
23 words
A coating rubber composition as claimed in claim 1, wherein the amount of said short fibers of syndiotactic-1,2-polybutadiene is 5-20 parts by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |