Patent US4372581A successfully refreshed from Google Patents.
US4372581A
Expired / Lapsed
US
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Pressure sensitive copying material
Assignee: Individual
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Filing: 1980-10-20
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Granted: 1983-02-08
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Expires: 2000-10-20
Abstract
Abstract A pressure sensitive copying element in the form of a web having on one side a color forming coating containing a mixture of alkanes of m.w. 500-3500 and dispersed therein 0.1 to 10% by weight of an incompatible material which is a cellulose derivative, hydrocarbon resin, melamine resin, phenolic resin, or styrene resin, and a solution of a color former in a solvent compatible with the material but incompatible with the alkanes. On the other side there may be a color developing coating containing aluminium oxide together with a binder.
Inventors
- 👤 Hermann Schumacher
- 👤 Tilman Molineus
- 👤 Detlef Ridder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:40
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A pressure sensitive copying element comprising a web having on one side thereof a colour forming coating comprising a layer of a single continuous phase mixture of alkanes having molecular weights from 500 to 3500 with from 0.1 to 10% by weight, based on the weight of said coating, a material selected from the group consisting of cellulose derivatives, hydrocarbon resins, melamine resins, phenolic resins, and styrene resins, and a solution of a colour former in a liquid solvent therefor, said material and said solution each being a separate phase and being dispersed directly in said single phase continuous mixture of alkanes.
Claim 2
Dependent Claim
102 words
A pressure sensitive copying element comprising a web having on one side thereof a colour forming coating comprising a layer of a single continuous phase mixture of alkanes having molecular weights from 500 to 3500 with from 0.1 to 10% by weight, based on the weight of said coating, a material selected from the group consisting of cellulose derivatives, hydrocarbon resins, melamine resins, phenolic resins, and styrene resins, and a solution of a colour former in a liquid solvent therefor, said material and said solution each being a separate phase and being dispersed directly in said single phase continuous mixture of alkanes.
Claim 3
Dependent Claim
29 words
A pressure sensitive copying element as claimed in claim 1 in which said web has on its other side a colour-developing coating comprising aluminium oxide together with a binder.
Claim 4
Dependent Claim
29 words
A pressure sensitive copying element as claimed in claim 1 in which said web has a first coating comprising polyvinyl alcohol between said colour forming coating and said web.
Claim 5
Dependent Claim
18 words
A pressure sensitive copying element as claimed in claim 1 in which said alkanes are predominantly straight chain.
Claim 6
Dependent Claim
43 words
A pressure sensitive copying element as claimed in claim 1 in which said alkanes have a molecular weight from 700 to 2000 and consist of a mixture of 80 to 95% by weight of n-alkanes and 5 to 20% by weight of iso-alkanes.
Claim 7
Dependent Claim
20 words
A pressure sensitive copying element as claimed in claim 1 or claim 2 in which said material comprises ethyl cellulose.
Claim 8
Dependent Claim
28 words
A pressure sensitive copying element as claimed in claim 1 or claim 2 in which said material comprises ethyl cellulose having an ethoxyl content from 44 to 49%.
Claim 9
Dependent Claim
41 words
A pressure sensitive copying element as claimed in claim 1 in combination with a second web having on one side thereof a colour-developing coating comprising aluminium oxide together with a binder, the coated sides of said webs being adjacent each other.
Claim 10
Independent Claim
134 words
The method of making a pressure sensitive copying element which comprises heating to a temperature 5° to 20° C. above its fusion point to form a melt, a color forming composition comprising a mixture of alkanes having molecular weights from 500 to 3500 with from 0.1 to 10% by weight, based on the weight of said composition, a material selected from the group consisting of cellulose derivatives, hydrocarbon resins, melamine resins, phenolic resins and styrene resins, and a solution of a color former in a liquid solvent therefor, said mixture of alkanes forming a single continuous phase, said material and said solution each forming a separate phase and being dispersed directly in said single phase continuous mixture of alkanes, and applying said melt to one side of a web to form a coating thereon.
Claim 11
Independent Claim
134 words
The method of making a pressure sensitive copying element which comprises heating to a temperature 5° to 20° C. above its fusion point to form a melt, a color forming composition comprising a mixture of alkanes having molecular weights from 500 to 3500 with from 0.1 to 10% by weight, based on the weight of said composition, a material selected from the group consisting of cellulose derivatives, hydrocarbon resins, melamine resins, phenolic resins and styrene resins, and a solution of a color former in a liquid solvent therefor, said mixture of alkanes forming a single continuous phase, said material and said solution each forming a separate phase and being dispersed directly in said single phase continuous mixture of alkanes, and applying said melt to one side of a web to form a coating thereon.
Claim 12
Dependent Claim
29 words
The method as claimed in claim 9 in which said web is paper and is first coated with a barrier coating to prevent complete impregnation by said colour-forming coating.
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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |