US4419470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood derived, thermoplastic ester mixtures as a substitute for petroleum-derived components in compounded rubber stocks
Assignee: Bridgestone Firestone Inc
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Filing: 1982-03-19
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Granted: 1983-12-06
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Expires: 2002-03-19
Abstract
Abstract Naturally occurring dark, tacky, low softening thermoplastic resins of low acid number can be used as substitutes for all or part of the non-elastomeric petroleum-derived components of rubber stocks used for manufacture of tires and other rubber articles. For example, such resins can be used to replace petroleum-derived process oils or resins, or both, used in making tires. The resins, which are derived from wood, are low softening thermoplastic resins characterized by having about 15-30% unsaponifiables, 3-20% rosin acids, 3-15% fatty acids and 5-15% sterols. A typical useful resin is commerically available under the name Pamak TP.
Inventors
- 👤 James A. Davis
- 👤 Robert C. Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:26
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; B; B60; B60C; B60C1/00; C08L21/00; C08L7/00; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/10; C08L93/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
An improved rubber stock containing conventional rubber components, wherein the improvement comprises replacing at least a portion of a petroleum derived product in the stock with a thermoplastic resin, said resin comprising carboxylic acid ester groups and derived from wood and both said petroleum-derived product and said resin not being elastomeric and being a minor portion of the stock.
Claim 2
Dependent Claim
59 words
An improved rubber stock containing conventional rubber components, wherein the improvement comprises replacing at least a portion of a petroleum derived product in the stock with a thermoplastic resin, said resin comprising carboxylic acid ester groups and derived from wood and both said petroleum-derived product and said resin not being elastomeric and being a minor portion of the stock.
Claim 3
Dependent Claim
64 words
A rubber stock according to claim 1, wherein said thermoplastic resin is derived from wood rosin, has a softening point of from about 35° C. to about 80° C., and an acid number of about 20 to about 40, and the amount of thermoplastic resin ranges from about 0.5 to about 25 parts per part by weight of petroleum-derived product which has been replaced.
Claim 4
Dependent Claim
37 words
A rubber stock according to claim 2, wherein the petroleum-derived produced replaced is selected from the group consisting of a petroleum-derived resin, a process oil, a tackifier, a softener, an extender, a processing aid, and combinations thereof.
Claim 5
Dependent Claim
30 words
A rubber stock according to claim 3, wherein the thermoplastic resin is used in said stock as a partial or total replacement for process oil or petroleum-derived resin, or both.
Claim 6
Dependent Claim
24 words
A rubber stock according to claim 1, 2 or 4, wherein the stock is cured and the thermoplastic resin is added prior to curing.
Claim 7
Dependent Claim
32 words
A rubber stock according to claim 4, wherein said rubber part is a component in a tire, and the thermoplastic resin has an acid number of from about 20 to about 35.
Claim 8
Dependent Claim
43 words
A rubber stock according to claim 4, wherein the rubber part is a tire component selected from the group consisting of a tread ply skim, stabilizer ply insert, body ply skim, sidewall, innerliner, bead filler, toe filler, chafer, undertread, tread and combinations thereof.
Claim 9
Dependent Claim
33 words
A rubber stock according to claim 1, 2 or 3, wherein the resin contains a majority of a saponifiable fraction, an unsaponifiable fraction, a fatty acid fraction, a rosin acid fraction and sterols.
Claim 10
Dependent Claim
28 words
A rubber stock according to claim 8, wherein the amount of said thermoplastic resin ranges from about 0.5 to about 10 parts per part of petroleum-derived product replaced.
Claim 11
Dependent Claim
26 words
A cured rubber stock according to claim 8, wherein the thermoplastic resin fraction contains about 15-30% unsaponifiables, 3-20% rosin acids, 3-15% fatty acids and 5-15% sterols.
Claim 12
Dependent Claim
23 words
A cured rubber stock according to claim 9, wherein the amount of resin is about 1 part per part of petroleum-derived product replaced.
References Cited (Backward Citations)
US4324710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |