Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Component noncoextensive with substrate
Reexamination Certificate
2000-02-04
2003-01-21
Hess, Bruce H. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Component noncoextensive with substrate
C503S200000, C503S215000
Reexamination Certificate
active
06509295
ABSTRACT:
This invention relates to record material for use in pressure-sensitive copying systems. Such record material is also known as carbonless copying paper.
Pressure-sensitive copying systems are well-known and are widely used in the production of business forms sets. Various types of pressure-sensitive copying system are known, of which the most widely used is the transfer type. A business forms set using the transfer type of pressure-sensitive copying material comprises an upper sheet usually known as a “CB” sheet) coated on its lower surface with microcapsules containing a solution in an oil solvent or solvent composition of at least one chromogenic material (alternatively termed a colour former) and a lower sheet usually known as a “CF” sheet) coated on its upper surface with a colour developer composition. If more than one copy is required, one or more intermediate sheets (usually known as “CFB” sheets) are provided, each of which is coated on its lower surface with microcapsules and on its upper surface with colour developer composition. Imaging pressure exerted on the sheets by writing, typing or impact printing (e.g. dot-matrix or daisy-wheel printing) ruptures the microcapsules, thereby releasing or transferring chromogenic material solution on to the colour developer composition and giving rise to a chemical reaction which develops the colour of the chromogenic material and so produces a copy image.
In a variant of the above-described arrangement, the solution of chromogenic material may be present as isolated droplets in a continuous pressure-rupturable matrix instead of being contained within discrete pressure-rupturable microcapsules.
In another type of pressure-sensitive copying system, usually known as a self-contained or autogenous system, microcapsules and colour developing co-reactant material are coated onto the same surface of a sheet, and writing or typing on a sheet placed above the thus-coated sheet causes the microcapsules to rupture and release the solution of chromogenic material, which then reacts with the colour developing material on the sheet to produce a coloured image.
Business forms sets utilising pressure-sensitive copying materials can be put to a wide variety of uses in, for example, business, commerce, and national and local government administration. For some of the many actual or potential uses of these products, it is desirable that at least one of the sheets making up the set should incorporate a security feature of some kind, in order that its authenticity can be verified. This is the case, for example, if one of the sheets of the set is to be used as proof of entitlement to a payment, or example an unemployment, sickness or pension benefit or a refund of tax or customs duty. Such payments are often made on presentation of appropriate documentation to a cashier. It is desirable that the cashier should be able to verify the authenticity of the documentation presented before payment is made. There is therefore a need for pressure-sensitive copying material incorporating a security feature by means of which its authenticity can be verified.
In principle, a security feature could be provided in a business forms set by the use of a conventional security paper as the base paper for subsequent coating with microcapsules and colour developer composition. Such security paper, an example of which is disclosed in our European Patent Application No. 391542A, can be authenticated by the use of an authenticating reagent which produces a colour change on application to the genuine security paper. In practice however, such security papers are normally too expensive for use in business forms sets, except for specialities such as cheques.
Our European Patent Application No. 0771669A relates to the use of fluorescent chromogenic material(s) to provide a security feature in pressure-sensitive copying material. This represents a significant advance in the art, but there is a market requirement for pressure-sensitive copying systems offering alternative or additional security features. It is therefore an object of the present invention to provide pressure-sensitive copying material incorporating a cost-effective and readily-verifiable security feature.
We have now discovered that a useful and readily verifiable security feature can be obtained if one or more of the coatings used in the production of record material for use in pressure-sensitive copying systems (including surface sizing coatings) is coloured by the addition of a dye or other colouring agent and then applied to the base paper substrate by a method which results in a film-split or other uneven coating pattern, i.e. an uneven distribution of the coating over the base paper surface. This is because the colouring agent has the effect of accentuating the coating pattern. Such coating patterns are difficult to replicate without access to large and expensive paper making and/or coating equipment. Whereas paper coating technologists normally seek to eliminate or minimise coating patterns, the present invention turns what is normally a drawback into a benefit.
According to a first aspect of the invention, there is provided record material for use in pressure-sensitive copying systems, said record material comprising a paper substrate optionally surfaced-sized with a surface sizing composition and carrying:
(a) a coating of isolated droplets of an oil solution of chromogenic material, said droplets being confined within respective pressure-rupturable barriers; and/or
(b) a coating of a colour developer material effective to develop the colour of an oil solution of chromogenic material on contact therewith;
said coatings, when both present, being on opposite surfaces of the substrate or on the same surface thereof, and when present on the same surface being either in separate layers or mixed in a single layer, characterised in that:
(c) at least one of the surface sizing composition, said coatings, or a further coating carried by the substrate is coloured by the presence of a dye or other colouring agent and has an uneven coloured coating pattern, which is accentuated by the colouring agent, the surface of the record material carrying the coloured coating pattern thus being of a distinguishably different appearance from that of the opposite surface of the record material.
In a second aspect, the present invention provides a method of producing record material for use in pressure-sensitive copying systems, said record material comprising a paper substrate optionally surface-sized with a surface sizing composition and carrying:
(a) a coating of isolated droplets of an oil solution of chromogenic material, said droplets being confined within respective pressure-rupturable barriers; and/or
(b) a coating of a colour developer material effective to develop the colour of an oil solution of chromogenic material on contact therewith;
said coatings, when both present, being on opposite surfaces of the substrate or on the same surface thereof, and when present on the same surface being either in separate layers or mixed in a single layer, characterised by the steps of:
(c) adding a dye or other colouring agent to at least one of the surface sizing composition, said coatings, or a further coating carried by the substrate; and
(d) applying and/or smoothing the coloured composition or coating by a method which results in an uneven coloured coating pattern;
whereby the coating pattern is accentuated by the presence of the colouring agent and is of a distinguishably different appearance from that of the opposite surface of said record material.
In a third aspect, the present invention provides a business forms set comprising pressure-sensitive copying material as just defined.
The further coating referred to above can be a coating present solely for colouration purposes or a coating having an additional technical function, for example, a precoat beneath the coating of isolated droplets of oil solution.
The surface size, when present, can be conventional in nature, for example it may be a starch or polyvinyl alcohol surfac
Cooper John Brian
Dumoulin Christian
Sheiham Ivan
Templey Margaret Patricia
Arjo Wiggins Limited
Hess Bruce H.
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