US4542191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber additives derived from guayule resins and compositions containing them
Assignee: Bridgestone Firestone Inc
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Filing: 1981-10-19
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Granted: 1985-09-17
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Expires: 2001-10-19
Abstract
Abstract Tackifying agents for rubber comprising at least one chemically or physically treated guayule resin fraction are disclosed. Physical treatments include vacuum deoiling, steam stripping deoiling, hexane deoiling, while chemical treatments include formaldehyde reaction, phenol/formaldehyde reaction, urea formaldehyde reaction, acid reaction and sulphur reaction. Untreated guayule resin fractions can also be used. Vulcanized and unvulcanized rubber compositions containing guayule resin derived tackifying agents as well as articles made therefrom are also disclosed.
Inventors
- 👤 Edward L. Kay
- 👤 Richard Gutierrez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; B; B29; B29K; B29K2021/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10S; Y10S525/00; Y10S525/93
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
A tackifying and green strength improving agent for rubber comprising of at least one chemically treated guayule resin fraction.
Claim 2
Dependent Claim
19 words
A tackifying and green strength improving agent for rubber comprising of at least one chemically treated guayule resin fraction.
Claim 3
Dependent Claim
48 words
The agent of claim 1 wherein the resin is chemically treated by at least one chemically reactive process chosen from the group consisting of (A) formaldehyde reaction, (B) phenol/formaldehyde reaction, (C) urea/formaldehyde reaction, (D) acid raaction, (E) sulphur reaction, and (F) combinations of two or more of (A)-(E).
Claim 4
Dependent Claim
14 words
The agent of claim 2 wherein the chemically reaction process is (A) formaldehyde reaction.
Claim 5
Dependent Claim
41 words
The agent of claim 3 wherein the treatment is carried out at a temperature of about 15°-150° C. and the proportions by weight of formaldehyde to resin are in the range at about 0.1-1.0 mole of formaldehyde to 100 parts resin.
Claim 6
Dependent Claim
14 words
The agent of claim 3 wherein the formaldehyde includes formaldehyde, and formaldehyde--containing and--producing substances.
Claim 7
Dependent Claim
22 words
The agent of claim 5 wherein the formaldehyde--containing and--producing substances are selected from the group consisting of formalin, paraformaldehyde, trioxane and methylal.
References Cited (Backward Citations)
US1835365A
Cited
GB486878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |