US3931097A
Expired / Lapsed
US
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Ethylene-propylene copolymer rubber composition having high modulus
Assignee: Bridgestone Corp
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Filing: 1974-12-04
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Granted: 1976-01-06
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Expires: 1994-12-04
Abstract
Abstract An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, and the homogeneous rubber composition cured at 120°-180°C having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy of at least 10 Kg/cm and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Inventors
- 👤 Ryota Fujio
- 👤 Nobuyuki Kataoka
- 👤 Motozumi Kitayama
- 👤 Yoshihide Fukabori
- 👤 Shiro Anzai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:06
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/04
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
139 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 2
Dependent Claim
139 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 3
Dependent Claim
149 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part hy weight of sulfur, and (e) 0.1-5.0 parts by weight of an ultraviolet absorbing agent, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 4
Dependent Claim
149 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part hy weight of sulfur, and (e) 0.1-5.0 parts by weight of an ultraviolet absorbing agent, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 5
Dependent Claim
151 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e') 1-10 parts by weight of carbon black and/or red iron oxide, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 6
Dependent Claim
151 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, which may contain an unsaturated third component, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e') 1-10 parts by weight of carbon black and/or red iron oxide, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 7
Dependent Claim
146 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e") 1-10 parts by weight of a mixture of ultraviolet absorbing agent and pigment, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 8
Dependent Claim
146 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e") 1-10 parts by weight of a mixture of ultraviolet absorbing agent and pigment, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 9
Dependent Claim
155 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e'") 1-10 parts by weight of a mixture of ultraviolet absorbing agent and at least one of carbon black and red iron oxide, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 10
Dependent Claim
155 words
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, and said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, (d) 0.01-0.25 part by weight of sulfur, and (e'") 1-10 parts by weight of a mixture of ultraviolet absorbing agent and at least one of carbon black and red iron oxide, said rubber composition when cured at 120-180°C being homogeneous and having a Young's modulus of 200-500 Kg/cm 2 , a tensile strength of at least 200 Kg/cm 2 , an elongation of at least 300%, a tear energy Γ of at least 10 Kg/cm, and retentions of Young's modulus and tensile strength at 70°C of at least 50%.
Claim 11
Dependent Claim
39 words
A rubber composition according to claim 1, wherein said ethylene-propylene copolymer is a rubbery copolymer having a Mooney viscosity of at least 75 and containing 40-80% of ethylene unit, 60-20% of propylene unit and 0-10% of unsaturated component unit.
Claim 12
Dependent Claim
16 words
A rubber composition according to claim 1, wherein the weight ratio of ethylene-propylene copolymer/divinylbenzene is 65/35-55/45.
Claim 13
Dependent Claim
22 words
A rubber composition according to claim 1, wherein said organic peroxide is dicumyl peroxide, di-t-butyl peroxide, 1,1-di-t-butyl-3,3,5-peroxycyclohexane, t-butyl cumyl peroxide or 2,5-dimethyl-2,5-di-t-butylperoxyhexane.
Claim 14
Dependent Claim
14 words
A rubber composition according to claim 1, wherein said organic peroxide is dicumyl peroxide.
Claim 15
Dependent Claim
34 words
A rubber composition according to claim 1, wherein the amount of said organic peroxide is 0.5-1.5 parts by weight based on 100 parts by weight of the total amount of ethylene-propylene copolymer and divinylbenzene.
Claim 16
Dependent Claim
32 words
A rubber composition according to claim 1, wherein the amount of sulfur is 0.03-0.16 part by weight based on 100 parts by weight of the total amount of ethylene-propylene copolymer and divinylbenzene.
Claim 17
Dependent Claim
33 words
A rubber composition according to claim 2, wherein said ultraviolet absorbing agent is 6-chloro-2-(2'-hydroxy-3'-t-butyl-5'-methyl)benzotriazole, 2-hydroxy-4-n-octoxybenzophenone, 2,2'-thiobis-(4-t-octyl phenolate)-n-butylamine nickel, 2'-hydroxy-4'-n-octoxybenzotriazole, nickel dibutyldithiocarbamate or a mixture of 2-hydroxy-4-n-octoxybenzophenone and nickel dibutyldithiocarbamate in the same weight.
Claim 18
Dependent Claim
35 words
A rubber composition according to claim 2, wherein the amount of said ultraviolet absorbing agent is 0.5-4.0 parts by weight based on 100 parts by weight of the total amount of ethylene-propylene copolymer and divinylbenzene.
Claim 19
Dependent Claim
16 words
A rubber composition according to claim 4, wherein said pigment is Phthalocyanine Green or Permanent Carmine.
Claim 20
Dependent Claim
19 words
A rubber composition according to claim 5, wherein said ultraviolet absorbing agent is 2,2'-thiobis-(4-t-octyl phenolate)-n-butylamine nickel or nickel dibutyldithiocarbamate.
References Cited (Backward Citations)
US3179715A
Cited
US3632680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |