Patent US4868048A successfully refreshed from Google Patents.
US4868048A
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Conductive sheet material having an aqueous conductive composition
Assignee: Wiggins Teape Group Ltd
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Filing: 1987-12-09
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Granted: 1989-09-19
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Expires: 2007-12-09
Abstract
Abstract An aqueous conductivising composition for conductivising paper or other sheet material, for example for producing a conductive base for use in dielectric paper or other electrostatic imaging material, is produced by (a) removing sodium magnesium trifluoride impurity (neighborite) from a synthetic hectorite clay conductivising agent, and (b) adding a binder. These measures reduce dust formation experienced in production or use of electrostatic imaging material incorporating a base which has been conductivised with a synthetic hectorite clay conductivising agent.
Inventors
- 👤 William K. Barr
- 👤 Doris V. Royston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:13
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/104; G03G5/101; Y; Y10; Y10S; Y10S428/00; Y10S428/918; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/259; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31928; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A conductive sheet material, comprising: sheet material selected from the group consisting of paper, polymer film and base for dielectric coatings, said sheet material carrying a coating of a conductivising composition, said conductivising composition comprising a conductivising agent comprising a synthetic hectorite clay which has had neighborite impurity removed and which has a magnesium silicate layered lattice structure in which magnesium ions are bound in octahedral relationship with hydroxyl ions, some of the magnesium ions being replaced by lithium ions and some of the hydroxyl ions being replaced by fluoride ions, and in which exchangeable cations are disposed between the layers of the layered lattice structure, and a binder, the neighborite removal and the presence of binder being such as to reduce the dusting of said conductivised material.
Claim 2
Dependent Claim
128 words
A conductive sheet material, comprising: sheet material selected from the group consisting of paper, polymer film and base for dielectric coatings, said sheet material carrying a coating of a conductivising composition, said conductivising composition comprising a conductivising agent comprising a synthetic hectorite clay which has had neighborite impurity removed and which has a magnesium silicate layered lattice structure in which magnesium ions are bound in octahedral relationship with hydroxyl ions, some of the magnesium ions being replaced by lithium ions and some of the hydroxyl ions being replaced by fluoride ions, and in which exchangeable cations are disposed between the layers of the layered lattice structure, and a binder, the neighborite removal and the presence of binder being such as to reduce the dusting of said conductivised material.
Claim 3
Dependent Claim
51 words
The conductive sheet material of claim 1, wherein said conductivising agent constitutes from 10 to 15% by weight of said composition and said binder is present in an amount of from 1 to 4%, based on the dry weight of binder in relation to the total weight of the aqueous composition.
Claim 4
Dependent Claim
34 words
The conductive sheet material of claim 1, wherein said binder is present in an amount of 2%, based on the dry weight of binder in relation to the total weight of the aqueous composition.
Claim 5
Dependent Claim
38 words
The conductive sheet material of claim 1, wherein said binder is selected from the group consisting of an aqueous styrene butadiene latex, an aqueous acrylic polymer emulsion, an aqueous acrylate/styrene copolymer dispersion and an aqueous poly(vinylidene chloride) suspension.
Claim 6
Dependent Claim
17 words
The conductive sheet material of claim 1, further comprising: a defoamer; a dispersant; or a mixture thereof.
Claim 7
Dependent Claim
15 words
The conductive sheet material of claim 1 wherein said paper is a naturally translucent paper.
Claim 8
Dependent Claim
30 words
The conductive sheet material of claim 6 wherein said paper is made from wet beaten stock and has a grammage of about 70 to about 75 g m -2 .
Claim 9
Dependent Claim
15 words
The conductive sheet material of claim 1 wherein said paper is a chemically transparentized paper.
Claim 10
Dependent Claim
14 words
The conductive sheet material of claim 1 wherein said paper is an opaque paper.
Claim 11
Dependent Claim
30 words
The conductive sheet material of claim 9 wherein said paper is made from wet beaten stock and has a grammage of about 65 to about 70 g m -2 .
Claim 12
Dependent Claim
11 words
The conductive paper of claim 1, further including a dielectric coating.
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |