Patent US4694067A successfully refreshed from Google Patents.
US4694067A
Expired / Lapsed
US
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Rubber composition for dust cover boots
Assignee: Zeon Corp
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Filing: 1985-07-16
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Granted: 1987-09-15
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Expires: 2005-07-16
Abstract
Abstract A rubber composition for dust cover boots comprising a copolymer rubber composed of 10 to 60 mole % of epichlorohydrin, 30 to 90 mole % of propylene oxide or both propylene oxide and ethylene oxide with the propylene oxide/ethylene oxide mole ratio being at least 1, and 0 to 15 mole % of an unsaturated epoxide, and a vulcanization agent for the copolymer rubber.
Inventors
- 👤 Akio Maeda
- 👤 Takeshi Chida
- 👤 Hirokatsu Seya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
F; F16; F16D; F16D3/00; F16D3/84; F16D3/843; F16D3/845; C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/14; C08G65/22; C08G65/24; C08L; C08L71/00; C08L71/02; C08L71/03
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
An improved rubber composition having characteristics of improved heat resistance, cold resistance, dynamic ozone resistance and bending resistance rendering it suitable for use as dust cover boots comprising a copolymer rubber composed of 10 to 60 mole % of epichlorohydrin, 30 to 90 mole % of propylene oxide or both propylene oxide and ethylene oxide with the propylene oxide/ethylene oxide mole ratio being at least 1 and 0 to 15 mole % of an unsaturated epoxide, and a vulcanization agent for the copolymer rubber.
Claim 2
Dependent Claim
84 words
An improved rubber composition having characteristics of improved heat resistance, cold resistance, dynamic ozone resistance and bending resistance rendering it suitable for use as dust cover boots comprising a copolymer rubber composed of 10 to 60 mole % of epichlorohydrin, 30 to 90 mole % of propylene oxide or both propylene oxide and ethylene oxide with the propylene oxide/ethylene oxide mole ratio being at least 1 and 0 to 15 mole % of an unsaturated epoxide, and a vulcanization agent for the copolymer rubber.
Claim 3
Dependent Claim
41 words
The composition of claim 1 wherein the copolymer rubber is composed of 15 to 55 mole% of epichlorohydrin, 35 to 85 mole% of propylene oxide or both propylene oxide and ethylene oxide, and 2 to 10 mole% of the unsaturated epoxide.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein the unsaturated epoxide is selected from allyl glycidyl ether, glycidyl methacrylate, glycidyl acrylate and butadiene monoxide.
Claim 5
Dependent Claim
28 words
The composition of claim 1 wherein the amount of the vulcanization agent is 0.1 to 10 parts by weight per 100 parts by weight of the copolymer rubber.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein the vulcanization agent is a polythiol or a thiourea.
Claim 7
Dependent Claim
24 words
The composition of claim 5 wherein the polythiol is selected from dimercapto-s-triazine compounds, trimercapto-s-triazine compounds, 2,5-dimercapto-1,3,4-thiadiazole compounds, 2,3-dimercaptopyrazine compounds, 2,3-dimercaptoquinoxaline compounds and 3,5-dimercapto-1,2,4-triazole compounds.
Claim 8
Dependent Claim
16 words
The composition of claim 5 wherein the thiourea is selected from 2-mercaptoimidazoline compounds and 2-mercaptopyrimidine compounds.
Claim 9
Dependent Claim
29 words
The composition of claim 1 wherein the copolymer rubber contains 1 to 15 mole% of the unsaturated epoxide and the vulcanization agent is selected from sulfur and sulfur donors.
Claim 10
Dependent Claim
12 words
The composition of claim 8 wherein the sulfur donors are thiuram compounds.
Claim 11
Dependent Claim
21 words
The composition of claim 1 wherein the copolymer rubber has a Mooney viscosity (ML 1+4 (100° C.)) of 10 to 100.
Claim 12
Dependent Claim
31 words
The composition of claim 1 prepared by mixing the copolymer rubber with a vulcanizing agent, a reinforcing agent, a filler, a plasticizer and an antioxidant in a roll or Banbury mixer.
Claim 13
Dependent Claim
31 words
The composition of claim 1 for use in molding dust cover boots and exhibiting grease (oil) resistance and bending resistance together with improved heat resistance, cold resistance and dynamic ozone resistance.
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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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |