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US4803250A Expired / Lapsed US ⏱️ 0.0 years remaining

Rubber composition with bismaleimides

Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1987-03-02
•
Granted: 1989-02-07
•
Expires: 2007-03-02
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Abstract

Abstract A rubber composition containing (A) a bismaleimide compound represented by the general formula (I) ##STR1## wherein R is a divalent acyclic aliphatic group, cyclic aliphatic group, aromatic group, or alkylaromatic group, these groups optionally containing a hetero atom selected from O, N and S in their chain or side substituent, (B) a sulfenamide compound represented by the general formula (II) ##STR2## wherein R 1 and R 2 denote independently from each other a hydrogen atom, an acyclic aliphatic group, or cyclic aliphatic group, or R 1 and R 2 together denote a chain aliphatic group which optionally contains an oxygen atom, provided that R 1 and R 2 cannot simultaneously denote a hydrogen atom, (C) a dithiophosphoric acid compound represented by the general formula (III) ##STR3## wherein R 3 and R 4 denote each an aliphatic group, and (D) sulfur; or (A) a bismaleimide compound represented by the general formula (I) defined above, (E) an aromatic carboxylic acid anhydride, (F) sulfur and/or a sulfur donor, and (G) volcanization accelerators.

Inventors

  • 👤 Hideo Nagasaki
  • 👤 Yasuzi Takemoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 06:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08F; C08F291/00; C08F291/02; C08K5/49; C08K5/5398

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 95 words
A rubber composition comprising a rubber selected from the group consisting of natural rubber, styrene-butadiene rubber, butadiene rubber, isoprene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene propylene-diene terpolymer and isoprene-isobutylene rubber, in combination with the following components: (A) a bismaleimide compound represented by the general formula (I) ##STR7## wherein R is a divalent acyclic aliphatic group, cyclic aliphatic group, aromatic group, or alkylaromatic group, and wherein these groups may contain a hetero atom selected from O, N, and S, (E) an aromatic carboxylic acid anhydride, (F) sulfur and/or a sulfur donor, and (G) a vulcanization accelerator.
Claim 2
Dependent Claim 95 words
A rubber composition comprising a rubber selected from the group consisting of natural rubber, styrene-butadiene rubber, butadiene rubber, isoprene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene propylene-diene terpolymer and isoprene-isobutylene rubber, in combination with the following components: (A) a bismaleimide compound represented by the general formula (I) ##STR7## wherein R is a divalent acyclic aliphatic group, cyclic aliphatic group, aromatic group, or alkylaromatic group, and wherein these groups may contain a hetero atom selected from O, N, and S, (E) an aromatic carboxylic acid anhydride, (F) sulfur and/or a sulfur donor, and (G) a vulcanization accelerator.
Claim 3
Dependent Claim 26 words
A rubber composition according to claim 1, wherein the bismaleimide compound represented by the general formula (I) is N,N'-ethylenebismaleimide, N,N'-hexamethylenebismaleimide, N,N'-(m-phenylene)bismaleimide, N,N'-(p-phenylene)bismaleimide, N,N'-(p-tolylene)bismaleimide,, N,N'-(methylenedi-p-phenylene)bismaleimide, or N,N'-(oxydi-p-phenylene)bismaleimide.
Claim 4
Dependent Claim 26 words
A rubber composition according to claim 1, wherein the rubber is a rubber selected from the group consisting of natural rubber, styrene-butadiene rubber, and acrylonitrile-butadiene rubber.
Claim 5
Dependent Claim 64 words
A rubber composition according to claim 1 which contains 0.1 to 8 parts by weight of the bismaleimide compound (I), 0.1 to 4 parts by weight of the aromatic carboxylic acid anhydride, 0.1 to 14 parts by weight of sulfur and/or the sulfur donor and 0.1 to 8 parts by weight of the vulcanization accelerator, each based on 100 parts by weight of rubber.
Claim 6
Dependent Claim 18 words
A rubber composition according to claim 1, wherein the sulfur is powdered sulfur, precipitated sulfur, or insoluble sulfur.
Claim 7
Dependent Claim 21 words
A rubber composition according to claim 1, wherein the aromatic carboxylic acid anhydride is phthalic anhydride, pyromellitic anhydride, or trimellitic anhydride.

References Cited (Backward Citations)

US1981168A Cited
US2524424A Cited
US2757155A Cited
US2879245A Cited
US3419521A Cited
US2989504A Cited
US3915943A Cited
SU1092162A1 Cited
US4569958A Cited
SU1151551A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-02-07 1992-08-08 1993-02-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-02-07 1996-08-08 1997-02-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-02-07 2000-08-08 2001-02-07 $7700.00 Window Closed / Lapsed

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