Correction and marking materials

Compositions: coating or plastic – Coating or plastic compositions – Marking

Patent

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Details

106 3196, C09D 1000

Patent

active

057025134

DESCRIPTION:

BRIEF SUMMARY
This invention relates to correction and marking materials and to correction and marking instruments comprising such materials.
Correction fluids are white paints which can be used to cover writing, typing and drawing errors and which, when dry, can be typed, written or drawn over. These fluids generally comprise an opacifying agent (usually a white pigment such as titanium dioxide), a polymeric binder, and a volatile or aqueous liquid medium in which the binder is soluble or dispersible. These fluids are normally used from small bottles equipped with an applicator brush but because the fluid must be very quick drying this system of application is prone to clogging and caking problems. They are also available in pen-like forms with rollers at the tip which dispense the correction fluid from an enclosed reservoir, and hence are substantially free from caking and clogging problems, but these are inconvenient for covering writing or typing. It is possible to mitigate these problems to some extent, but this requires more complex arrangements which add to the cost.
It is also known to provide correction fluids in the form of "solid" paint sticks (see, for example, European patent specification no. 0513498). These "solid" paints are actually highly viscous thixotropic liquids consisting of a liquid phase and solids. They are normally wet to the touch, and upon application of any shear they revert to liquid. When they are used as correction fluids, they are laid down as a liquid and a significant time is then needed for the solvent(s) to evaporate to leave a dry coating.
All correction systems which rely on a stored correction fluid in one form or another encounter the problem of drying-time: whether the fluid is a volatile or an aqueous solution, the necessity of waiting between 10 and 40 seconds (at least) before the corrected surface can be written over is an inherent disadvantage of the system. There is therefore a need for a correction system whereby correction opacifiers can be conveniently applied to a substrate, usually paper, to cover writing, typing, etc. but in which they are not stored or held in a liquid, and can be written over immediately after application to a substrate.
Marking instruments, by which is meant instruments for writing, drawing or other marking, typically involve either (a) application of an ink or other fluid to a paper or other substrate, conventionally (and necessarily) including a reservoir for the fluid storage and means for conducting the stored fluid to the marking tip for application to the substrate, or (b) deposition on to the paper or other substrate, by abrasion or smearing, of a solid marking material e.g. as in the case of a pencil or wax crayon.
In the case of (a) there is always a risk of evaporative dry-out, or of leakage of the fluid from the nib or tip of the instrument, and the consequent need of providing a cap or cover to avoid these risks, and also to protect the nib or tip from damage or from staining clothes. In the case of conventional ink there is also the need to let the ink dry before it is contacted. For these and various other reasons, the construction of such marking instruments is often more complex and costly, and the risks of malbehaviour are never entirely eliminated. In the case of (b) the marking material frequently lacks structural strength and stability and is hence prone to damage or breaking, and in some cases to staining if inadvertently brought into contact with paper or clothes.
We have now devised a new correction or marking material whereby the principal problems outlined above can be reduced or overcome.
In particular, and in accordance with a feature of the present invention, we have devised a carrier matrix for a correction or marking agent, which matrix whilst solid can be made temporarily liquid for deposit on a substrate, and immediately thereafter hardened. In this way, the advantages of solid systems are maintained whilst also achieving the advantages of liquid application to a substrate, and in addition very short "drying" times

REFERENCES:
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patent: 5199976 (1993-04-01), Yau et al.
patent: 5236494 (1993-08-01), Kano
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patent: 5338775 (1994-08-01), Matz et al.
patent: 5403872 (1995-04-01), Koreska
patent: 5453120 (1995-09-01), Rendino et al.
patent: 5480920 (1996-01-01), Sharma et al.
patent: 5578117 (1996-11-01), Matz et al.

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