US4369267A
Expired / Lapsed
US
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Process for dispersing carbon black in polyethylene
Assignee: Union Carbide Canada Ltd
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Filing: 1980-05-09
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Granted: 1983-01-18
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Expires: 2000-05-09
Abstract
Abstract A process for dispersing fine particle size carbon blacks in low density polyethylene whereby an initially prepared carbon black--low density polyethylene masterbatch, consisting of from 20-50 percent by weight carbon black, is let-down by intensive mixing, in a dry blended mixture of low density polyethylene and high density polyethylene, or propylene polymer, to form an intermediate masterbatch, which is further let-down in low density polyethylene by a second intensive mixing stage. The proportions of each component are chosen to yield a final product consisting of (on a weight basis) from 1-5% carbon black, 1-10% high density polyethylene or propylene polymer, and at least 50% of the remainder being low density polyethylene. The final products so obtained exhibit good carbon black dispersion on a microscopic basis and are essentially free of carbon black agglomerates, the type of which are usually formed by the more standard processes wherein the initial masterbatch is simply let-down into low density polyethylene by only a single intensive mixing stage.
Inventors
- 👤 Chue-Kwok J. Keung
- 👤 Donald E. Rathgeber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J3/203; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2423/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
190 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein which process comprises: (A) intensive mixing from 20% to 50% by weight of carbon black with from 80% to 50% by weight of a low density polyethylene to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene and a propylene polymer, and (ii) low density polyethylene to produce an intermediate masterbatch blend wherein the amount of carbon black is from 1.1% to 46% by weight, the amount of polymer is from 9% to 85% by weight and the amount of total low density polyethylene is at least 5% by weight of the total intermediate masterbatch blend, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene so that the proportion of carbon black in the product is from 1.0% to 5% by weight and the proportion of polymer is from 1.0% to 10% by weight of the total composition, at least 50% of the remainder being low density polyethylene.
Claim 2
Dependent Claim
190 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein which process comprises: (A) intensive mixing from 20% to 50% by weight of carbon black with from 80% to 50% by weight of a low density polyethylene to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene and a propylene polymer, and (ii) low density polyethylene to produce an intermediate masterbatch blend wherein the amount of carbon black is from 1.1% to 46% by weight, the amount of polymer is from 9% to 85% by weight and the amount of total low density polyethylene is at least 5% by weight of the total intermediate masterbatch blend, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene so that the proportion of carbon black in the product is from 1.0% to 5% by weight and the proportion of polymer is from 1.0% to 10% by weight of the total composition, at least 50% of the remainder being low density polyethylene.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1 wherein said carbon black has a primary particle size of from 5 nm to 100 nm.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 2 wherein said low density polyethylene has a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 3 wherein said polymer is high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.10 to 10.0 dg/min.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 3 wherein said polymer is a propylene polymer having a melt index of from 0.1 to 10.0 dg/min.
Claim 7
Dependent Claim
288 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein which process comprises: (A) intensive mixing from 25% to 40% by weight of carbon black having a primary particle size of from 5 nm to 100 nm with from 75% to 60% by weight of a low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.1 to 10.0 dg/min., and a propylene polymer having a melt index of from 0.1 to 10.0 dg/min., and (ii) low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an intermediate masterbatch blend wherein the amount of carbon black is from 4.4% to 35.0% by weight, and the amount of polymer is from 65% to 9.0% by weight and the weight of the low density polyethylene is at least 15% by weight of the total intermediate masterbatch, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., so that the proportion of carbon black in the product is from 1.0% to 4.0% by weight and the proportion of polymer is from 2.0% to 6.0% by weight of the total composition, at least 75% of the remainder being low density polyethylene.
Claim 8
Dependent Claim
288 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein which process comprises: (A) intensive mixing from 25% to 40% by weight of carbon black having a primary particle size of from 5 nm to 100 nm with from 75% to 60% by weight of a low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.1 to 10.0 dg/min., and a propylene polymer having a melt index of from 0.1 to 10.0 dg/min., and (ii) low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an intermediate masterbatch blend wherein the amount of carbon black is from 4.4% to 35.0% by weight, and the amount of polymer is from 65% to 9.0% by weight and the weight of the low density polyethylene is at least 15% by weight of the total intermediate masterbatch, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., so that the proportion of carbon black in the product is from 1.0% to 4.0% by weight and the proportion of polymer is from 2.0% to 6.0% by weight of the total composition, at least 75% of the remainder being low density polyethylene.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 6 wherein said carbon black has a primary particle size of from 10 nm to 50 nm.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 7 wherein said low density polyethylene has a specific gravity of from 0.910 to 0.924 and a melt index of from 0.2 to 6.0 dg/min.
Claim 11
Dependent Claim
33 words
A process as claimed in claim 8 wherein said polymer is high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.2 to 4.0 dg/min.
Claim 12
Dependent Claim
24 words
A process as claimed in claim 8 wherein said polymer is a propylene polymer having a melt index of from 0.2 to 4.0 dg/min.
Claim 13
Dependent Claim
286 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein, which process comprises: (A) intensive mixing 30% to 35% by weight of carbon black having a primary particle size of from 5 nm to 100 nm with from 70% to 65% by weight of a low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/mn., to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.1 to 10.0 dg/min., and a propylene polymer having a melt index of from 0.1 to 10.0 dg/min., and (ii) low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an intermediate masterbatch blend wherein the amount of carbon black is from 12% to 26% by weight and the amount of polymer is from 47% to 18% by weight, the weight of the low density polyethylene is at least 30% by weight of the total intermediate masterbatch, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., so that the proportion of carbon black in the product is from 2% to 3% by weight and the proportion of polymer is from 3% to 5% by weight of the total composition, at least 85% of the remainder being low density polyethylene.
Claim 14
Dependent Claim
286 words
A process for producing a polyethylene composition having fine particle size carbon black dispersed therein, which process comprises: (A) intensive mixing 30% to 35% by weight of carbon black having a primary particle size of from 5 nm to 100 nm with from 70% to 65% by weight of a low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/mn., to produce an initial masterbatch blend, then (B) intensive mixing by kneading action said initial masterbatch blend with (i) a polymer selected from the group consisting of high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.1 to 10.0 dg/min., and a propylene polymer having a melt index of from 0.1 to 10.0 dg/min., and (ii) low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., to produce an intermediate masterbatch blend wherein the amount of carbon black is from 12% to 26% by weight and the amount of polymer is from 47% to 18% by weight, the weight of the low density polyethylene is at least 30% by weight of the total intermediate masterbatch, then (C) intensive mixing said intermediate masterbatch blend with a further amount of low density polyethylene having a specific gravity of from 0.910 to 0.924 and a melt index of from 0.1 to 20.0 dg/min., so that the proportion of carbon black in the product is from 2% to 3% by weight and the proportion of polymer is from 3% to 5% by weight of the total composition, at least 85% of the remainder being low density polyethylene.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 11 wherein said carbon black has a primary particle size of from 15 nm to 30 nm.
Claim 16
Dependent Claim
31 words
A process as claimed in claim 12 wherein said low density polyethylene has a specific gravity of from 0.910 to 0.924 and a melt index of from 1.0 to 3.0 dg/min.
Claim 17
Dependent Claim
33 words
A process as claimed in claim 13 wherein said polymer is high density polyethylene having a specific gravity of from 0.940 to 0.965 and a melt index of from 0.2 to 1.0 dg/min.
Claim 18
Dependent Claim
24 words
A process as claimed in claim 13 wherein said polymer is a propylene polymer having a melt index of from 0.2 to 1.0 dg/min.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |