Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1995-01-17
1996-06-11
Hess, Bruce
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
428195, 428480, 428532, 428913, 428914, B41M 5035, B41M 538
Patent
active
055255744
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a thermal transfer printing (TTP) receiver sheet and especially to a TTP receiver sheet having a backcoat which possesses improved properties.
Thermal transfer printing is a printing process in which a dye is caused, by thermal stimuli, to transfer from a dye sheet to a receiver sheet. In such processes, the dye sheet and receiver sheet are placed in intimate contact, the thermal stimuli are applied to the dye sheet and the dye sheet and receiver sheet are then separated. By applying the thermal stimuli to pre-determined areas in the dye-sheet, the dye is selectively transferred to the receiver to form the desired image.
Receiver sheets conventionally comprise a substrate with a dye-receiving polar surface on one side, into which a dye is thermally transferable and retainable. Where the substrate is itself polar and capable of receiving a dye, the dye may be transferred directly to a surface of the substrate. However receiver sheets typically comprise a substrate supporting a receiver layer specifically tailored to receive the dye.
Receiver sheets may also comprise a backcoat on the opposite surface to the dye-receiving surface which is typically employed to impart desirable characteristics to the sheet to improve both processing of the sheet during application of the TTP image and the end use properties of the sheet depending on the particular application of the sheet.
In many applications, for example for use as post cards and greetings cards, it is a requirement that the backcoat be capable of receiving drafting marks from for example pencils and inks, both aqueous and solvent based. Other characteristics which the backcoat should desirably possess when employed in such applications include a good resistance to smudging of the applied drafting marks and an ability to accept aqueous based adhesives, for example to allow adherence of a postage stamp to the sheet.
Hitherto, receiver sheets for use in such applications have been deficient in certain respects due to the combination of properties which it is desired that such a receiver sheet should possess.
However, we have now devised a receiver sheet which has a backcoat having an improved combination of characteristics which make the sheet particularly suitable for use in applications in which drafting marks are to be applied to the backcoat and/or adhesive, especially aqueous based adhesive is to be accepted by the backcoat.
According to a first aspect of the invention there is provided a thermal transfer printing receiver sheet which comprises a substrate having a dye-receiving surface on one side and a backcoat on the other side wherein the backcoat comprises a sulphonated polyester.
The backcoat of receiver sheets according to the first aspect of the invention are compatible with both aqueous based and non aqueous based materials and thus provide good adhesion to both non aqueous and aqueous based adhesives which may be employed to adhere labels, stamps and the like to the receiver backcoat. Furthermore, this compatibility improves the capability to receive non-aqueous and aqueous based inks and provides an improved writability for the receiver backcoat.
Suitably, the sulphonated polyester in the backcoat is a salt of a sulphonated polyester, for example an alkali metal salt and preferably an ammonium salt. Particularly preferred sulphonated polyesters include Eastman Size WD30, AQ29, AQ38 and AQ55 (solid or dispersion) available from Eastman Kodak and Toyobo MD1400 sulphonated polyesters.
The sulphonated polyester is suitably present in the backcoat in an amount of at least 30% by weight of the back coat to maintain the mechanical integrity of the coating and to avoid an undesirable decrease in the adhesion of the backcoat to the substrate. Preferably the sulphonated polyester is present in an amount of up to 80% by weight of the backcoat and especially 40 to 70% by weight.
Suitably, the sulphonated polyester has an average molecular weight of up to about 30000 and preferably in the range 10000 to 20000. The sulphonated poly
REFERENCES:
Japan Patent Abstract, vol. 10, No. 151 (M-483) (2208) 31 May 1986 & JP, A,61,003 796 (Mitsubishi Seishi KK).
Japan Patent Abstract, vol. 11, No. 183 (M-598(2630) 12 Jun. 1987 & JP A 61 011 680 (Tomoegawa Paper).
Japan Patent Abstract, vol. 11, No. 191 (M-600) (2638) 19 Jun. 1987 & JP A 62 016 185 (Tomoegawa Paper).
Hess Bruce
Imperial Chemical Industires PLC
Sheehan John M.
LandOfFree
Thermal transfer printing receiver sheet does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermal transfer printing receiver sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal transfer printing receiver sheet will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-351631