Patent US4431765A successfully refreshed from Google Patents.
US4431765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free flowing polybutadiene resin particles and process for the preparation thereof
Assignee: Bridgestone Firestone Inc
•
Filing: 1980-12-18
•
Granted: 1984-02-14
•
Expires: 2000-12-18
Abstract
Abstract The invention herein is directed toward a process of preparing free flowing thermoset resin particles of polybutadiene and includes the steps of physically mixing a filler material with polybutadiene followed by chopping the mixture into small particles or granules which are irregularly shaped. A vulcanizing agent can be added during the mixing step as well as other ingredients commonly added to polybutadiene resin formulations, as is customarily done in the art, without affecting the free flowing properties of the polybutadiene treated according to the process of this invention.
Inventors
- 👤 John M. Doshak
- 👤 Mark R. Roodvoets
- 👤 Adel F. Halasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:46
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08K; C08K3/00; C08K3/01; C08K3/013; C08J2309/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A process for forming free flowing polybutadiene thermoset resins that are free flowing and resistant to cold flow at ambient temperatures comprising the steps of: adding to a high molecular weight polybutadiene, having a 1,2-vinyl content of at least 90 percent, an amount of a filler material up to about 400 parts per 100 parts rubber, said amount being sufficient to render said resin free flowing and resistant to cold flow; mixing said polybutadiene resin with said filler to form a blend; and chopping said blend into small particles.
Claim 2
Dependent Claim
89 words
A process for forming free flowing polybutadiene thermoset resins that are free flowing and resistant to cold flow at ambient temperatures comprising the steps of: adding to a high molecular weight polybutadiene, having a 1,2-vinyl content of at least 90 percent, an amount of a filler material up to about 400 parts per 100 parts rubber, said amount being sufficient to render said resin free flowing and resistant to cold flow; mixing said polybutadiene resin with said filler to form a blend; and chopping said blend into small particles.
Claim 3
Dependent Claim
43 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene has a number average molecular weight of from about 100,000 to about 500,000 and has a vinyl content of from about 90 to 100 percent.
Claim 4
Dependent Claim
62 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said filler material is selected from the group consisting of graphite, carbon black, silica, mica, calcium carbonate, clay, talc, hydrated alumina, atomite, perlite, magnesia, pumice, glass spheres, and mixtures thereof and is employed in amounts of from about 50 to 400 parts per 100 parts rubber.
Claim 5
Dependent Claim
46 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said filler material is selected from the group consisting of fibrous reinforcement materials and is employed in amounts of from about 10 to about 400 parts per 100 parts rubber.
Claim 6
Dependent Claim
46 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene has a number average molecular weight of 230,000, said filler is graphite and is present in an amount of from 200 to 300 parts per 100 parts rubber.
Claim 7
Dependent Claim
43 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene has a number average molecular weight of 230,000, said filler is silica and is present in an amount of 200 parts per 100 parts rubber.
Claim 8
Dependent Claim
44 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene has a number average molecular weight of 100,000, said filler is carbon black and is present in an amount of 25 parts per 100 parts rubber.
Claim 9
Dependent Claim
44 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene has a number average molecular weight of 100,000, said filler is calcium carbonate and is present in an amount of 25 parts per 100 parts rubber.
Claim 10
Dependent Claim
30 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, further comprising from about 20 to 40 parts per 100 parts rubber of calcium carbonate.
Claim 11
Dependent Claim
53 words
A process for forming free flowing polybutadiene thermoset resins as set forth in claim 1, wherein said polybutadiene resin has a number average molecular weight range of from about 200,000 to 400,000, said filler is fiberglass and is present in an amount of from about 10 to 235 parts per 100 parts rubber.
References Cited (Backward Citations)
US3769256A
Cited
US3835075A
Cited
US3998778A
Cited
US3821158A
Cited
US3912685A
Cited
US3852225A
Cited
US3925275A
Cited
US4073755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |