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US4328133A Expired / Lapsed US ⏱️ 0.0 years remaining

Organic micro-fiber reinforced rubber compositions

Assignee: Bridgestone Corp
•
Filing: 1981-06-23
•
Granted: 1982-05-04
•
Expires: 2001-06-23
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Abstract

Abstract Organic micro-fiber reinforced rubber compositions having high elastic modulus, excellent crack growth resistance, impact cut resistance and rebound resilience and a small swell value are prepared by incorporating 10-100 parts by weight of carbon black, 3-30 parts by weight of organic micro-fibers based on 100 parts by weight of at least one rubber selected from a group consisting of natural rubber, synthetic polyisoprene rubber, butyl rubber, halogenated butyl rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber, ethylene-propylene-diene ternary copolymeric rubber and acrylonitrile-butadiene copolymeric rubber, said micro-organic staple fibers being lower than 30° C. or higher than 120° C. in glass transition temperature of amorphous portion and higher than 160° C. in melting point of crystal portion, and having an average length of the micro-fibers of 0.8-30 μm, an average diameter of the micro-fibers of 0.02-0.8 μm and a ratio of the average length of the micro-fibers to the average diameter of the micro-fibers of 8-400.

Inventors

  • 👤 Masaki Ogawa
  • 👤 Yasushi Hirata
  • 👤 Mikihiko Ikegami

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 07:34
CPC Classifications
C; C08; C08L; C08L21/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10513; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 143 words
In organic micro-fiber reinforced rubber compositions in which 10-100 parts of weight of carbon black and 3-30 parts by weight of organic micro-fibers are incorporated based on 100 parts by weight of at least one rubber selected from a group consisting of natural rubber, synthetic polyisoprene rubber, butyl rubber, halogenated butyl rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber, ethylene-propylene-diene ternary copolymeric rubber and acrylonitrile-butadiene copolymeric rubber, the improvement comprising using fibers having a glass transition temperature of amorphous portion of lower than 30° C. or higher or 120° C. and a melting point of crystal portion of higher than 160° C., and having an average length of the micro-fibers of 0.8-30 μm, an average diameter of the micro-fibers of 0.02-0.8 μm and a ratio of the average length of the micro-fibers to the average diameter of the micro-fibers of 8-400 as the organic micro-fibers.
Claim 2
Dependent Claim 143 words
In organic micro-fiber reinforced rubber compositions in which 10-100 parts of weight of carbon black and 3-30 parts by weight of organic micro-fibers are incorporated based on 100 parts by weight of at least one rubber selected from a group consisting of natural rubber, synthetic polyisoprene rubber, butyl rubber, halogenated butyl rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber, ethylene-propylene-diene ternary copolymeric rubber and acrylonitrile-butadiene copolymeric rubber, the improvement comprising using fibers having a glass transition temperature of amorphous portion of lower than 30° C. or higher or 120° C. and a melting point of crystal portion of higher than 160° C., and having an average length of the micro-fibers of 0.8-30 μm, an average diameter of the micro-fibers of 0.02-0.8 μm and a ratio of the average length of the micro-fibers to the average diameter of the micro-fibers of 8-400 as the organic micro-fibers.
Claim 3
Dependent Claim 40 words
Micro-organic staple fiber reinforced rubber compositions as claimed in claim 1, wherein said organic micro-fibers are polyvinylidene chloride, polyvinylidene fluoride, poly-p-tert-butylstryrene, poly-p-chlorostyrene, polydichlorostyrene, poly-α-methylstyrene, poly-2-methyl-styrene, poly-2,5-dimethylstyrene, polytrimethylstyrene, poly-p-phenylstyrene, poly-o-vinylbenzyl alcohol, poly-p-vinylbenzyl alcohol, isotactic-polypropylene, poly-4-methyl-1-pentene, poly-vinylnaphthalene, poly-oxymethylene, poly-bisphenol A carbonate, poly-2,3-dimethylbutadiene.
Claim 4
Dependent Claim 28 words
Organic micro-fiber reinforced rubber compositions as claimed in claim 1, wherein a swell value when the unvulcanized rubber composition is extruded at 100° C. is less than 130%.

References Cited (Backward Citations)

US3827991A Cited
US3852225A Cited
US4193437A Cited
US4255296A Cited
US4215021A Cited
US4257468A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-03 1985-11-02 1986-05-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-03 1989-11-02 1990-05-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-03 1993-11-02 1994-05-04 $7700.00 Window Closed / Lapsed

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