GB2103674A - Solvent for dyestuffs to be used in self copying papers - Google Patents
Solvent for dyestuffs to be used in self copying papers Download PDFInfo
- Publication number
- GB2103674A GB2103674A GB08216119A GB8216119A GB2103674A GB 2103674 A GB2103674 A GB 2103674A GB 08216119 A GB08216119 A GB 08216119A GB 8216119 A GB8216119 A GB 8216119A GB 2103674 A GB2103674 A GB 2103674A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solvent
- dyestuffs
- self
- copying papers
- papers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
- B41M5/165—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components characterised by the use of microcapsules; Special solvents for incorporating the ingredients
- B41M5/1655—Solvents
Landscapes
- Color Printing (AREA)
- Paper (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a solvent for the dyestuffs to be applied to self- copying (no-carbon) papers, characterized in that it comprises a mixture of the following hydrocarbons: <IMAGE>
Description
SPECIFICATION
Solvent for dyestuffs to be used in self-copying papers
This invention aims to provide a solvent for the dyestuffs to be employed with advantage in the field of the self-copying papers.
In this connection, it is known that a solvent suitable for that particular use must possess a few basic prerequisites, such as a high chemical inertness towards the dyestuffs to be dissolved therein and the property of permitting that the dyestuff, once it has been developed, may remain stably on the paper.
More particularly, it is desirable that such a solvent be odorless: It should be observed, on this subject matter, that nearly all the solvent as used at present to that purpose have a certain degree of smell, that which is an obvious inconvenience for the users of such self-copying papers.
An objective of the invention is thus to provide a solvent for the dyestuffs to be employed in selfcopying papers, possessing in a high degree the advantageous properties outlined above.
Together with this objective, the invention also aims to achieve that of preparing such a solvent starting from raw materials which are readily available at a low cost, this result being obtained through a chemical conversion which is comparatively simple.
It has now been surprisingly found, and this is the subject matter of the present invention, that the objectives indicated above can be achieved by a solvent for the dyestuffs to be applied to selfcopying papers, characterized in that it comprises a mixture of the following hydrocarbons:
According to the invention, the synthesis of such compounds is essentially based on the Friedel
Crafts reaction between a dihalous derivative of the kind X-R-X wherein X is a halogen atom, and
R is a -CH2-CH2- group, and an aromatic hydrocarbon selected frpm the group consisting of toluene and xylene.
Said reaction is carried out with the usual catalysts of the kind AIR13, FeCI3, 8F3, at moderate temperatures, so that isomerization phenomena can be minimized.
The molar ratio of the aromatic hydrocarbon to the halogenated derivative can be varied widely according to whether it is desired to obtain, predominantly, low molecular weight compounds, or products having a longer chain and thus a higher boiling point temperature.
In addition, the evolved hydrogen chloride can be recovered in the form of an aqueous concentrated solution which can be used as such.
On completion of the reaction, the catalyst is destroyed with water or an alkali and the reaction mass is washed and neutralized, the excess hydrocarbon is separated by rectificative distillation, whereupon the final product is recovered by distillation.
A few examples are reported hereinafter of synthesis of the compounds referred to above, which are suitable for making the solvent according to the invention.
Example 1
A 60-litre reactor equipped with stirring device, condenser, heating system, hydrogen chloride binding system, is charged with 55.4 kg of toluene and, of these, 9.9 kg are distilled off in order to dehydrate the balance 45.5 kg of toluene, which correspond to 493.8 mols. The liquid is allowed to cool to 800C and AICI3 is added (40 g), whereafter 4.073 kg of 1 ,2-dichloroethane are added slowly dropwise thereto. The reaction is completed after about 6 hours, as the evolution of hydrogen chloride is over and the gaschromatographic analysis shows that dichloroethane is no longer present. The reaction mass is twice washed with an equal volume of lukewarm water and the organic phase is separated, to be rectified (20-plate column) until toluene has completely been removed.
The residual mass is vacuum distilled and there are obtained 7.250 kg of an oily fluid product which has a light straw colour.
This product is a mixture of the hydrocarbons defined in the formulae (lea) and (Ib) reported above.
Example 2
A Friedel-Crafts reaction has been carried out according to a procedure which is very much the same as that of Example 1, by employing xylene (a mixture of isomers).
Once xylene has been stripped by rectification, a clear fluid oily product has been obtained by distillation under a negative pressure (2 Torr) and said product has proven to be a inixture of the hydrocarbons defined by the formulae (ill) and (llb) above.
By blending the product as obtained according to Example 1 with that obtained in Example 2 in variable proportions, a liquid is obtained, which is capable of dissolving in a very advantageous way any dyestuff of those conventionally known for use in self-copying papers.
More particularly commercial dyestuffs have been tested, which are known in the trade under the following names:
Reakt Violett K, a product of BASF, and
Pergascript Violett l-R, Pergascript Blau l-2R, Pergascript Blau S-4G, Pergascript Rot 1-6B and
Pergascript Olive l-G, all manufactured by CIBA-GEIGY.
The solvent of the invention has shown a very good solvent power towards all of these dyestuffs, along with a high chemical inertness, a high stability of the color developer on paper, and a nearly absolute absence of smell.
Inasmuch as the raw materials used for producing the solvents according to the invention is readily available at a not too high price and the chemical process for its production is inherently simple and direct, it can be appreciated that the invention permits that all the initially preselected objectives may be successfully achieved.
Claims (1)
- Claims1. A solvent for dyestuffs to be applied to self-copying papers, characterized in that it consists of an admixture of the following hydrocarbons:
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22130/81A IT1136651B (en) | 1981-06-04 | 1981-06-04 | SOLVENT FOR DYES IN SELF-COPYING PAPER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2103674A true GB2103674A (en) | 1983-02-23 |
Family
ID=11191935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08216119A Withdrawn GB2103674A (en) | 1981-06-04 | 1982-06-02 | Solvent for dyestuffs to be used in self copying papers |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3220469A1 (en) |
| FR (1) | FR2507197A1 (en) |
| GB (1) | GB2103674A (en) |
| IT (1) | IT1136651B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046698C (en) * | 1996-05-10 | 1999-11-24 | 江苏省化工研究所 | Production method for 1,2-(3,3',4,4'-tetramethyl-dibenzene) ethane |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6141593A (en) * | 1984-08-06 | 1986-02-27 | Nippon Petrochem Co Ltd | Solvent for dye of pressure-sensitive paper |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492126B1 (en) * | 1970-10-27 | 1974-01-18 | ||
| BE790321A (en) * | 1971-10-20 | 1973-04-19 | Monsanto Co | SOLVENTS FOR COLORANTS OF PRESSURE SENSITIVE RECORDING MATERIALS |
| IT1135418B (en) * | 1981-02-11 | 1986-08-20 | Caffaro Spa Ind Chim | DIELECTRIC INSULATING FLUID IN PARTICULAR SUITABLE FOR USE IN ELECTRIC CONDENSERS, AND CONDENSER CONTAINING SUCH FLUID |
-
1981
- 1981-06-04 IT IT22130/81A patent/IT1136651B/en active
-
1982
- 1982-05-29 DE DE19823220469 patent/DE3220469A1/en not_active Withdrawn
- 1982-06-02 GB GB08216119A patent/GB2103674A/en not_active Withdrawn
- 1982-06-02 FR FR8209569A patent/FR2507197A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046698C (en) * | 1996-05-10 | 1999-11-24 | 江苏省化工研究所 | Production method for 1,2-(3,3',4,4'-tetramethyl-dibenzene) ethane |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3220469A1 (en) | 1982-12-23 |
| IT1136651B (en) | 1986-09-03 |
| IT8122130A0 (en) | 1981-06-04 |
| FR2507197A1 (en) | 1982-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |