US3929755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolyzed rosin products as synthetic rubber tackifiers
Assignee: United States Department of Agriculture
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Filing: 1973-06-01
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Granted: 1975-12-30
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Expires: 1993-06-01
Abstract
Abstract Styrene-butadiene synthetic rubber compositions of enhanced building tack from a content therein of from 1 to 15 phr (parts rosin derivative per hundred parts rubber) of pyrolyzed wood rosin and various pyrolyzed vacuum distillation cuts of a wood rosin.
Inventors
- 👤 Ray F Severson
- 👤 Walter H Schuller
- 👤 Jr N Mason Joye
- 👤 Ray V Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:13
CPC Classifications
C; C09; C09F; C09F1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A PROCESS FOR MAKING PONDEROSA FF WOOD ROSIN EFFECTIVE AS A RUBBER TACKIFIER WHICH PROCESS COMPRISES PYROLYZING SAID ROSIN AT A TEMPERATURE OF ABOUT 500*-800*C IN THE ABSENCE OF CATALYST FOR A PERIOD OF ABOUT 0.01 TO 10 SECONDS.
Claim 2
Dependent Claim
39 words
A PROCESS FOR MAKING PONDEROSA FF WOOD ROSIN EFFECTIVE AS A RUBBER TACKIFIER WHICH PROCESS COMPRISES PYROLYZING SAID ROSIN AT A TEMPERATURE OF ABOUT 500*-800*C IN THE ABSENCE OF CATALYST FOR A PERIOD OF ABOUT 0.01 TO 10 SECONDS.
Claim 3
Dependent Claim
70 words
A process for producing pyrolyzed ponderosa FF-wood rosin effective as a rubber tackifier, said process comprising: a. introducing said rosin in liquid form into a pyrolysis apparatus consisting essentially of a glass tube packed with glass rods, the apparatus heated to a temperature of from 500* to 800* C.; b. allowing the rosin to pyrolyze in said apparatus for from 0.01 to 10 seconds; and c. recovering said pyrolyzed rosin.
Claim 4
Dependent Claim
70 words
A process for producing pyrolyzed ponderosa FF-wood rosin effective as a rubber tackifier, said process comprising: a. introducing said rosin in liquid form into a pyrolysis apparatus consisting essentially of a glass tube packed with glass rods, the apparatus heated to a temperature of from 500* to 800* C.; b. allowing the rosin to pyrolyze in said apparatus for from 0.01 to 10 seconds; and c. recovering said pyrolyzed rosin.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein the rosin is the forecut of vacuum distilled wood rosin.
Claim 6
Dependent Claim
17 words
The process of claim 2 wherein the rosin is the pot residue of vacuum distilled wood rosin.
Claim 7
Dependent Claim
10 words
The rubber tackifier produced by the process of claim 1.
Claim 8
Dependent Claim
10 words
The rubber tackifier produced by the process of claim 3.
Claim 9
Dependent Claim
10 words
The rubber tackifier produced by the process of claim 4.
References Cited (Backward Citations)
US1926676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |