US5376698A
Expired / Lapsed
US
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Polyolefin compositions containing coated mica particles to prevent yellowing and methods therefore
Assignee: BASF Catalysts LLC
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Filing: 1993-09-21
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Granted: 1994-12-27
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Expires: 2013-09-21
Abstract
Abstract Antioxidant containing polyolefin compositions are provided including titanium dioxide-coated mica particles comprising a coating of silica and alumina calcined thereon to prevent yellowing of the compositions. Process for preventing the yellowing of antioxidant containing polyolefin compositions is also disclosed.
Inventors
- 👤 Ioannis P. Sipsas
- 👤 Brian Mullaney
- 👤 Leigh A. Kelderhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:00
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/02
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
39 words
A composition comprising: a polyolefin; an antioxidant; and mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a calcined coating consisting of silica and alumina thereon.
Claim 2
Dependent Claim
39 words
A composition comprising: a polyolefin; an antioxidant; and mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a calcined coating consisting of silica and alumina thereon.
Claim 3
Dependent Claim
12 words
A composition according to claim 1, wherein the antioxidant is butylated hydroxytoluene.
Claim 4
Dependent Claim
11 words
A composition according to claim 1, wherein the polyolefin is polyethylene.
Claim 5
Dependent Claim
37 words
A composition according to claim 1, wherein the coating of silica and alumina comprises of about 1.5% to 4.0% of silicon and of about 0.5% to 2.0% of aluminum, based on the weight of the coated mica.
Claim 6
Dependent Claim
37 words
A composition according to claim 1, wherein the coating of silica and alumina comprises of about 1.5% to 3.0% of silicon and of about 0.8% to 1.5% of aluminum, based on the weight of the coated mica.
Claim 7
Dependent Claim
24 words
A composition according to claim 1, wherein the coating of silica and alumina is calcined at a temperature of about 800° to 950° C.
Claim 8
Dependent Claim
24 words
A composition according to claim 1, wherein the coating of silica and alumina is calcined at a temperature of about 825° to 875° C.
Claim 9
Dependent Claim
16 words
A composition according to claim 1, wherein the coating of titanium dioxide is the rutile form.
Claim 10
Dependent Claim
16 words
A composition according to claim 1, wherein the coating of titanium dioxide is the anatase form.
Claim 11
Dependent Claim
29 words
An antioxidant containing composition comprising, in addition to the antioxidant, titanium dioxide-coated mica particles, the titanium dioxide-coated mica particles having a layer consisting of silica and alumina calcined thereon.
Claim 12
Dependent Claim
29 words
An antioxidant containing composition comprising, in addition to the antioxidant, titanium dioxide-coated mica particles, the titanium dioxide-coated mica particles having a layer consisting of silica and alumina calcined thereon.
Claim 13
Dependent Claim
49 words
A micaceous pigment for preventing yellowing in antioxidant containing polyolefin compositions, the pigment being mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a coating consisting of silica and alumina; the second layer being calcined thereon.
Claim 14
Dependent Claim
49 words
A micaceous pigment for preventing yellowing in antioxidant containing polyolefin compositions, the pigment being mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a coating consisting of silica and alumina; the second layer being calcined thereon.
Claim 15
Dependent Claim
56 words
A process for preventing the yellowing of an antioxidant containing polyolefin composition, which comprises mixing the polyolefin with mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a coating consisting of silica and alumina, the second layer being calcined thereon, and an antioxidant.
Claim 16
Dependent Claim
56 words
A process for preventing the yellowing of an antioxidant containing polyolefin composition, which comprises mixing the polyolefin with mica particles having on a surface thereof a first layer of a coating consisting of titanium dioxide and a second layer of a coating consisting of silica and alumina, the second layer being calcined thereon, and an antioxidant.
Claim 17
Dependent Claim
22 words
The process according to claim 12, further comprising tile step of preparing the polyolefin composition by adding an antioxidant to the polyolefin.
Claim 18
Dependent Claim
12 words
The process according to claim 12, wherein the antioxidant is butylated hydroxytoluene.
Claim 19
Dependent Claim
26 words
The process according to claim 12, further comprising the step of providing the second layer of silica and alumina on the first layer of titanium dioxide.
Claim 20
Dependent Claim
19 words
The process according to claim 12, further comprising the step of calcining the second layer of silica and alumina.
Claim 21
Dependent Claim
21 words
The process according to claim 12, further comprising the step of providing a layer of titanium dioxide on the mica particles.
Claim 22
Dependent Claim
20 words
The process according to claim 12, further comprising the step of preparing a polyolefin composition wherein the polyolefin is polyethylene.
Claim 23
Dependent Claim
21 words
The process according to claim 12, further comprising the step of providing a layer of a coating of silica and alumina.
Claim 24
Dependent Claim
24 words
The process according to claim 19, wherein the step of providing a layer of silica and alumina comprises adding the silica before the alumina.
Claim 25
Dependent Claim
24 words
The process according to claim 19, wherein the step of providing a layer of silica and alumina comprises adding the silica after the alumina.
Claim 26
Dependent Claim
27 words
The process according to claim 12, wherein the first layer of a coating of titanium dioxide is calcined before calcining the second layer of silica and alumina.
Claim 27
Dependent Claim
25 words
The process according to claim 12, wherein the first layer of coating of titanium dioxide is calcined with the second layer of silica and alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |