US3675009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black blending in rubber
Assignee: Phillips Petroleum Co
•
Filing: 1970-05-18
•
Granted: 1972-07-04
•
Expires: 1990-05-18
Abstract
Abstract A method has been developed for predicting the relative abrasion index of a rubber into which carbon black is blended, depending upon a particle size distribution relationship of the carbon black.
Inventors
- 👤 Gerard Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A method of selecting a carbon black for incorporating in a rubber recipe to produce a rubber having desired abrasion properties, said abrasion properties being substantially influenced by the properties of said carbon black, which comprises: a. determining the heterogeneity index for each of said carbon blacks, said heterogeneity index being represented by the formula in which H is the heterogeneity index, and D3, D2 and D are the number averages of the cube, square and first power of the particle diameters of said carbon blacks; b. correlating the heterogeneity index of each of said carbon blacks with the abrasion properties of rubber into which each of said carbon blacks is individually blended to establish a correlation between said heterogeneity indices of said blacks and the abrasion properties of said rubber; and, c. employing said correlation to select a carbon black which upon incorporation in a rubber recipe produces a rubber having desired abrasion properties.
Claim 2
Independent Claim
155 words
A method of selecting a carbon black for incorporating in a rubber recipe to produce a rubber having desired abrasion properties, said abrasion properties being substantially influenced by the properties of said carbon black, which comprises: a. determining the heterogeneity index for each of said carbon blacks, said heterogeneity index being represented by the formula in which H is the heterogeneity index, and D3, D2 and D are the number averages of the cube, square and first power of the particle diameters of said carbon blacks; b. correlating the heterogeneity index of each of said carbon blacks with the abrasion properties of rubber into which each of said carbon blacks is individually blended to establish a correlation between said heterogeneity indices of said blacks and the abrasion properties of said rubber; and, c. employing said correlation to select a carbon black which upon incorporation in a rubber recipe produces a rubber having desired abrasion properties.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which said carbon blacks have specific surface areas of from 70 to 150 square meters per gram.
Claim 4
Dependent Claim
17 words
The method of claim 1 in which said carbon blacks Have substantially equal structure and surface area.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which said particle diameters of said carbon blacks are determined by electron microscope.
Claim 6
Dependent Claim
16 words
The method of claim 1 in which said heterogeneity indices are between 1.2 and about 1.3.
Claim 7
Dependent Claim
15 words
The method of claim 1 in which said heterogeneity indices are between 1.2 and 2.1.
References Cited (Backward Citations)
US3397583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |