US4165398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive copying paper
Assignee: Wiggins Teape UK PLC
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Filing: 1977-01-12
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Granted: 1979-08-21
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Expires: 1997-01-12
Abstract
Abstract A method of producing self-contained pressure-sensitive copying material having a coating which contains both a particulate mineral color-developing material and microcapsules enclosing a solution of a colorless color former which is reactive with the color developing material to produce a colored product, in which the particles of color developing material (e.g. an acidic clay) and optionally the microcapsules as well, are treated with a protective agent to inhibit premature color development. The protective agent may be a self-crosslinkable polymer, such as an aminoplast polymer (e.g. a urea-formaldehyde or melamine-formaldehyde polymer), or a epichlorohydrin polymer (e.g. an aminoepichlorohydrin or an amide/aminoepichlorohydrin polymer), or an anionic surfactant (e.g. a lauryl sulphate salt or a sulphonated ricinoleic acid derivative, a dodecyl benzene sulphonate salt, or a dibutyl or dioctyl ester of sulphosuccinic acid), or a fluorine-containing paper sizing agent, or a non-self-crosslinkable polymer which is a wet-strength agent for paper (e.g. a polyethylene imine resin).
Inventors
- 👤 Paul R. Raine
- 👤 Lawrence Westcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:08
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; B41M5/165; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
110 words
A method of preparing pressure-sensitive copying material comprising the steps of: (a) forming a coating composition comprised of (i) microcapsules containing a solution of a colourless colour former, (ii) particulate mineral colour developing material which has been chemically treated with a protective agent in an amount which is less than about 10% based on the weight of the particulate mineral colour developing material and which is effective in inhibiting premature colour development, said protective agent being characterized by being compatible with said microcapsules and by being substantially non-interferring with the colour developing properties of the colour developing material, and, (iii) binder; and (b) applying said coating composition to a substrate.
Claim 2
Independent Claim
110 words
A method of preparing pressure-sensitive copying material comprising the steps of: (a) forming a coating composition comprised of (i) microcapsules containing a solution of a colourless colour former, (ii) particulate mineral colour developing material which has been chemically treated with a protective agent in an amount which is less than about 10% based on the weight of the particulate mineral colour developing material and which is effective in inhibiting premature colour development, said protective agent being characterized by being compatible with said microcapsules and by being substantially non-interferring with the colour developing properties of the colour developing material, and, (iii) binder; and (b) applying said coating composition to a substrate.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said protective agent is polyethylene imine resin.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said protective agent is a flourine-containing paper sizing agent.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein said protective agent is an anionic surfactant having a group selected from the group consisting of sulphate groups and sulphonate groups.
Claim 6
Dependent Claim
43 words
The method of claim 4 wherein said anionic surfactant is selected from the group consisting of a sulphonated ricinoleic acid derivative, a lauryl sulphate salt, a dodecyl benzene sulphonate salt, a dibutyl ester of sulphosuccinic acid and a dioctyl ester of sulphosuccinic acid.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said protective agent is a self-crosslinkable polymer.
Claim 8
Dependent Claim
15 words
The method of claim 6 wherein the coating composition is blade coated onto said substrate.
Claim 9
Dependent Claim
24 words
The method of claim 6 wherein the coated substrate has a dry coatweight in the range of from 10 to 15 g/m 2 .
Claim 10
Dependent Claim
13 words
The method of claim 6 wherein said self-crosslinkable polymer is an aminoplast polymer.
Claim 11
Dependent Claim
28 words
The method of claim 9 wherein said aminoplast polymer is derived from one member of the group consisting of (1) melamine and formaldehyde, and (2) urea and formaldehyde.
Claim 12
Dependent Claim
12 words
The method of claim 6 wherein the binder comprises hydrolyzed polyvinyl alcohol.
Claim 13
Dependent Claim
16 words
The method of claim 11 wherein dispersant and stilt material are added to the coating composition.
Claim 14
Dependent Claim
13 words
The method of claim 6 wherein the self-crosslinkable polymer is an epichlorohydrin polymer.
Claim 15
Dependent Claim
23 words
The method of claim 13 wherein the epichlorohydrin polymer is selected from the group consisting of an aminoepichlorohydrin polymer and an amide/aminoepichlorohydrin copolymer.
Claim 16
Independent Claim
144 words
A method of preparing pressure-sensitive copying material comprising the steps of: (a) forming a coating composition comprised of (i) microcapsules containing a solution of a colourless colour former, said microcapsules having been chemically treated with a first protective agent, (ii) particulate mineral colour developing material which has been chemically treated with a second protective agent, and (iii) binder; and (b) applying said coating composition to a substrate, wherein said first and second protective agents are added in an amount which is less than about 10% based on the total of the weight of the particulate mineral colour developing material and the dry weight of the microcapsules, said amount being effective in inhibiting premature colour development, said first and second protective agents being characterized by being compatible with said microcapsules and by being substantially non-interferring with the colour developing properties of the colour developing material.
Claim 17
Independent Claim
144 words
A method of preparing pressure-sensitive copying material comprising the steps of: (a) forming a coating composition comprised of (i) microcapsules containing a solution of a colourless colour former, said microcapsules having been chemically treated with a first protective agent, (ii) particulate mineral colour developing material which has been chemically treated with a second protective agent, and (iii) binder; and (b) applying said coating composition to a substrate, wherein said first and second protective agents are added in an amount which is less than about 10% based on the total of the weight of the particulate mineral colour developing material and the dry weight of the microcapsules, said amount being effective in inhibiting premature colour development, said first and second protective agents being characterized by being compatible with said microcapsules and by being substantially non-interferring with the colour developing properties of the colour developing material.
Claim 18
Dependent Claim
17 words
The method of claim 15 wherein the first and second protective agents are a polyethylene imine resin.
Claim 19
Dependent Claim
18 words
The method of claim 15 wherein the first and second protective agents are a flourine-containing paper sizing agent.
Claim 20
Dependent Claim
30 words
The method of claim 15 wherein the first and second protective agents are an anionic surfactant having a group selected from the group consisting of sulphate groups and sulphonate groups.
Claim 21
Dependent Claim
42 words
The method of claim 18 wherein said anionic surfactant is selected from the group consisting of sulphonated ricinoleic acid derivative, a lauryl sulphate salt, a dodecyl benzene sulphonate salt, a dibutyl ester of sulphosuccinic acid and a dioctyl ester of sulphosuccinic acid.
Claim 22
Dependent Claim
15 words
The method of claim 15 wherein said first and second protective agents are self-crosslinkable polymers.
Claim 23
Dependent Claim
17 words
The method of claim 20 wherein said first and second protective agents are the same self-crosslinkable polymer.
Claim 24
Dependent Claim
13 words
The method of claim 21 wherein the self-crosslinkable polymer is an epichlorohydrin polymer.
Claim 25
Dependent Claim
23 words
The method of claim 22 wherein the epichlorohydrin polymer is selected from the group consisting of an aminoepichlorohydrin polymer and an amide/aminoepichlorohydrin copolymer.
Claim 26
Dependent Claim
13 words
The method of claim 21 wherein said self-crosslinkable polymer is an aminoplast polymer.
Claim 27
Dependent Claim
28 words
The method of claim 24 wherein said aminoplast polymer is derived from one member of the group consisting of (1) melamine and formaldehyde, and (2) urea and formaldehyde.
Claim 28
Dependent Claim
12 words
The method of claim 24 wherein said binder is hydrolyzed polyvinyl alcohol.
Claim 29
Dependent Claim
24 words
The method of claim 24 wherein the coated substrate has a dry coatweight in the range of from 10 to 15 g/m 2 .
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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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |