US4414359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diene-containing rubber compositions having improved green strength
Assignee: Bridgestone Firestone Inc
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Filing: 1982-01-25
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Granted: 1983-11-08
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Expires: 2002-01-25
Abstract
Abstract The invention disclosed herein provides a process for preparing a diene-containing synthetic rubber having improved green strength which includes the steps of charging a reaction vessel with water, an emulsifier, an initiator, an N-(alkoxymethyl)acrylamide monomer and a monomer containing a vinyl group, purging the vessel with an inert gas, charging a diene monomer and an activator to the vessel, polymerizing the monomers to form a copolymer; and, thereafter extracting the copolymer from the vessel and any unreacted monomers. A styrene-butadiene composition containing up to about 10 percent by weight of N-(isobutoxymethyl)acrylamide exhibits better stress-strain properties than a comparable styrene-butadiene rubber without the acrylamide compound.
Inventors
- 👤 David J. Dougherty
- 👤 Binnur Gunesin
- 👤 John W. Spiewak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F212/00; C08F236/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A novel synthetic rubber composition having improved green strength formed by the emulsion copolymerization, at temperatures of about 0° to 30° C., of: from about 0.5 to about 10 percent by weight of an N-(alkoxymethyl)acrylamide having the formula ##STR2## wherein R is selected from the group consisting of straight and branched alkyl chains having from 1 to about 20 carbon atoms; from about 10 to about 90 percent by weight of a conjugated diene compound having from about four to about 20 carbon atoms; and from about 1 to about 90 percent by weight of a monomer containing a vinyl group selected from the group consisting of monovinyl aromatic compounds having from eight to about 20 carbon atoms and acrylic compounds having from three to about five carbon atoms; and, thereafter compounded with from about 20 to about 80 phr of carbon black, from about 1 to about 40 phr of oil and from about 1 to about 10 phr each of sulfur and an accelerator.
Claim 2
Dependent Claim
166 words
A novel synthetic rubber composition having improved green strength formed by the emulsion copolymerization, at temperatures of about 0° to 30° C., of: from about 0.5 to about 10 percent by weight of an N-(alkoxymethyl)acrylamide having the formula ##STR2## wherein R is selected from the group consisting of straight and branched alkyl chains having from 1 to about 20 carbon atoms; from about 10 to about 90 percent by weight of a conjugated diene compound having from about four to about 20 carbon atoms; and from about 1 to about 90 percent by weight of a monomer containing a vinyl group selected from the group consisting of monovinyl aromatic compounds having from eight to about 20 carbon atoms and acrylic compounds having from three to about five carbon atoms; and, thereafter compounded with from about 20 to about 80 phr of carbon black, from about 1 to about 40 phr of oil and from about 1 to about 10 phr each of sulfur and an accelerator.
Claim 3
Dependent Claim
31 words
A novel synthetic rubber composition, as set forth in claim 1, wherein said N-(alkoxymethyl)acrylamide is N-(isobutoxymethyl)-acrylamide, said conjugated diene compound is butadiene and said monomer containing a vinyl group is styrene.
Claim 4
Dependent Claim
35 words
A novel synthetic rubber composition, as set forth in claim 2, containing about 3% by weight of N-(isobutoxymethyl)acrylamide and having a stress at break greater than 0.2 MPa and elongation at break greater than 600%.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |