FR2770450A1 - USE OF ALCOXYL TRIGLYCERIDES - Google Patents

Abstract

It is recommended to use alkoxylated triglycerides as a solvent for color producing preparations in microcapsule form for the preparation of pressure sensitive carbon papers. Unlike known solvents based on methyl esters, nonionic surfactants exhibit better dissolving properties and pose no odor problem.

Description

Field of the Invention The present invention relates to the use of

  alkoxylated triglycerides as solvents for general preparations

  colors and a process for making carbon paper. State of the art

  Commercial carbon papers consist of ge-

  general in two leaves, of which the upper leaf (in an-

  "CB-sheet") is covered on its lower side with

  microencapsulated dye precursor (reagent I), and the other

  tre (in English "CF-sheet") is covered at its upper side

  laughing with a color developer composition (reagent II).

  When applying mechanical pressure, for example when

  that one writes or under the action of the typing of a typewriter, the capsule of the reagent I is crushed, which releases the

  reagent that binds with reagent II in a chemical reaction

  mique with color revelation. As solvents for

  microencapsulated reagent we certainly use mixtures of ke

  rosene with alkylnaphthalenes, partial terphenylenes-

  slightly hydrogenated, diarylmethane derivatives, dibenzyl or chloroparaffin derivatives, but for eco-toxicological reasons, less problematic solutions are needed. We have certainly recommended vegetable oils for

  the same application objective, but we could not use them

  due to their lack of solubilizing properties.

  According to the European patent application EP-A-

  0 390 432, the use of nonionic surfactants is known as dispersants for dyestuffs in a hydrophobic solvent. The subject of the European patent application

  EP-A-0 487 347 is the use of mixtures of ethers of

  lyglycol and dialkyl esters as solvents for preparations

  coloring. In this regard, European patent application EP-A-0 593 192 (Wiggins Teape Group) recommends the use

  mono- or polybasic esters, in particular metallic esters

  thylics as solvents. However, these esters pose

  problem in that they have an insufficient cloud point and in addition that they cannot be used

  only in a very limited way given their own smell.

  The object of the invention was therefore to develop new solvents for coloring preparations which

  are free from the disadvantages mentioned above.

Description of the invention

  The invention relates to the use of triglycerides of alkoxylates as solvents for coloring preparations in the form of microcapsules for the production of paper.

pressure sensitive carbon.

  Surprisingly we found that the trigly-

  alkoxylated cerides have excellent dispersing properties

  solution for the coloring preparations and furthermore that they

have no odor problem.

  Alkoxylated triglycerides Among the alkoxylated triglycerides are understood the known fixing products of alkylene oxides, that is to say ethylene oxide, propylene oxide or their mixtures, on esters of tri acids -glycerin fats, which can

  be of a synthetic nature or of natural origin and which

  preferably have the formula (I) R4CO (OCH2CHR20) pO

I (I)

  R1CO (OCH2CHR2) nOCH2CHCH20 (CH2CHR20) mOCR3

1 3 4

  in which R Co, R3CO and R CO independently represent

  from each other linear or branched acyl radicals, sa-

  turbid or unsaturated, having from 6 to 22 carbon atoms, R re-

  has hydrogen or methyl, and the sum

  (n + m + p) represent numbers ranging from 1 to 10. As an example-

  typical types include glycerides based on acids

  fatty having from 6 to 22, preferably from 8 to 20 and in particular

  link 12 to 18 carbon atoms, for example:

  capronic acid, caprylic acid, 2- acid

  ethylhexanoic, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmoleic acid, stearic acid, isostearic acid, oleic acid, acid elaidic, petroselinic acid,

  linoleic acid, linolenic acid, eléostéari- acid

  that, arachic acid, gadoleic acid, behenic acid and erucic acid as well as their industrial mixtures, which

  appear for example during decomposition under pres-

  fat and natural oils or when

  reduction of aldehydes from Roe- oxosynthesis

  len. Instead of synthetic triglycerides, refined animal fats can also be used, such as

  example beef tallow or pork lard; preferably

  Vegetable oils are used and some of them are used

  slurry of lauric oils as starting materials, such as

  example coconut oil, palm oil, palm oil

  miste, rapeseed oil, sunflower oil, olive oil, olive kernel oil, peanut oil, cottonseed oil, seed oil tea tree,

  linseed oil, etc. For technical application reasons

  tion, we prefer to use fixing products from 2 to 5

  moles of ethylene oxide on lauric oils and in par-

  particular fixing products of 2 to 5 moles of oxide

  ethylene on coconut oil. The production of triglycerides

  alkoxylated wrinkles are carried out according to the processes of the prior art, for example by insertion of alkylene oxide

  in the carbonyl ester bond in the presence of hydrotalci-

  your charred, as it says for example in the patent

  European EP-B1-0 474 644 (Henkel). Preparation and use

  low propoxylated coconut oil as a product

  of brightening are the subject of the European patent application EP-

A1-0 596 847 (H ls).

  Reagent I (micro- dye precursor

  Encapsulated) As a microencapsulated reagent I, which must be dissolved within the meaning of the invention, the following products should be mentioned, for example: phthalides such as, for example, 3,3-bis (4-dimethylaminophenyl) -6dimethyl- aminophthalide (CVL) or 3,3-bis (1-octyl-2-methylindol-3yl) phthalide, fluoranes

  such as 2'-anilino-6'-diethylamino-3'-methylfluo-

  rane, 6'-dimethylamino-2 '- (N-ethyl-N-phenylamino-4'-methyl-

  fluorane), 2'-N-methyl-N-phenylaminofluorane-6-N-ethyl-N (4-

  methylphenylaminofluorane or 3'-chloro-6'-cyclohexylamino-

  fluorane; spirobipyrans such as 3'-i-propyl-7-

  dibenzylamino-2,2'-spirobi- (2H-1-benzopyran). You also have to

  Also mention triphenylmethyl compounds such as

  described for example in European patent application EP-A-

  0 263 569. The reactive amount can be 1 to 10, preferably 4 to 8% by weight in the solvent. We can manufacture

  quer the microcapsules in a known manner, for example by-

  encapsulation in gelatins or other suitable polymers, or as appropriate by in situ polymerization of corresponding monomers. In this connection, reference will be made to the corresponding state of the art, mentioned in this connection.

  in document EP-A-0 590 3192. The mixture is then mixed

  the microcapsules with an appropriate binder (for example

  example a starch or a mixture of starch and carboxymethyl-

  thylcellulose), to protect them from indefinite opening

  sirable. The coating of the papers with the microcapsules can be carried out in a manner also known, the quantity used being in an order of magnitude ranging from 1 to 10, from

preferably 5 to 7 g / m.

  Reagent II (development agent) As a color development agent,

  mention for example acid clays (document US-

  3,753,761), phenolic resins (documents US Pat. No. 3,672,935,

  US-4,312,254) or their salts (documents US-3,024,927, EP-A-

0 275 107, DE-A-4 110 354).

  Procedure The invention also finally relates to a process for manufacturing carbon papers for the implementation of the device, consisting of a color production layer and a color developer layer, in which (a) The preparations producing color (reagent I) in alkoxylated triglycerides, (b) The solutions are introduced into microcapsules and optionally formulated with binders, (c) The sheets are coated (in English "CB-sheets") on a side with microcapsules, and (d) Each time is combined with sheets (in English "CF-sheets") which have on one side a coating of revealing agent, provided that the sheets CB- and CF are combined -sheets of

  so that by mechanical pressure and opening of the microcaps-

  Only color-producing preparations can react with developers with color development. The carbon papers themselves may have a thickness of from 90 μm and a weight of 35 to 100, preferably from 40 to

g / m2.

Examples

  Examples 1 to 6, comparative examples V1 to V6.

  As solvent according to the invention, coconut oil plus 2 EO and coconut oil plus 5 EO are tested (Examples 1 to 6); for the comparative examples V1 to V6 a mixture of

  diisopropylnaphthalene in kerosene or as the case may be

  ter methyl of coconut fatty acid. First of all we say

  supports the color-giving components (classic mixture of green and black fluoranes as well as red bis-indolylphthalide), so that preparations at 5% appear

  weight. Between 50 and 55 C we put the solutions in caps

  gelatin and are ground to obtain a dispersion.

  This is mixed with water and with a carboxymethylcellulose solution and adjusted to pH 4.2 by addition of acetic acid, which produces a coacervation. Then the ready-made microcapsules are brought to neutral pH by adding a

  based. Finally we formulate the different dispersions of micro-

  capsules with starch and crushed cellulose as a binder and a commercial paper (50 g / m) is thus coated (layer thickness 5 to 7 g / m). To test the intensity of

  color pass the coated CB paper with the microcaps

  sules, with the corresponding CF paper, containing the revela-

  tor (acid montmorillonite), through a calendering machine, to break the microcapsules under defined conditions. Then the intensity of the color is determined (immediately and after 5 hours) by photometry relative to a standard (CF paper not used). The reflection is given as a percentage of the initial reflection, i.e.

  the lower the value, the more intense the color.

  The results are collated in Table 1.

Table 1

  Color intensity measurement Ex. Solvent Coating- Reflection [% -rel] [g / m2] Immé. 5 a.m. 1 Coconut oil + 20E 5 66.4 65.0 2 Coconut oil + 20E 6 64.0 63.1 3 Coconut oil + 50E 7 63.1 60.2 4 Coconut oil + 50E 5 66.4 65 .0 Coconut oil + 50E 6 64.2 63.6 6 Coconut oil + 50E 7 62.3 61.1 V1 Diisopropylnaphthalene / kero- 5 66.0 65.8 sene (1: 1) V2 Diisopropylnaphthalene / kero- 6 65.0 64.3 sene (1: 1) V3 Diisopropylnaphthalene / kero- 7 64.1 63.9 sene (1: 1) V4 Methyl acid ester 5 65.8 65.7 C12 coconut fat at C14 V5 Methyl acid ester 6 64.1 63.8 coconut fat C12 to C14 V6 Methyl acid ester 7 63.8 63.1 coconut fat C12 to C14 The examples and comparative examples show that use of the alkoxylated triglycerides according to the invention leads to carbon papers which are characterized by a higher color intensity. Although the reason for this has not yet been clarified, it appears to be related to the cloud point of the solvents. Another advantage stems from the fact that the papers produced using the solvents to be used according to the invention do not have an annoying odor,

  while the comparison papers have a distinct smell of ke

rosene or fat.

Claims (6)

R E V E N D I C A T I ONS   1) Use of alkoxylated triglycerides as solvents   for preparations producing color in the form of half   crocapsules for the production of sensitive carbon paper   ble at pressure. 2) Use according to claim 1, characterized in that alkoxylated triglycerides of formula (I) are used R4CO (OCH2CHR20) pO i (') R1 CO (OCH2CHR2) nO2HCH2CHCH20 (CH2CHR20) mOCR3 O1 3 4   in which R CO, R CO and R CO independently of one another represent linear or branched acyl radicals, saturated or unsaturated, having from 6 to 22 carbon atoms, R represents a hydrogen or a methyl group, and the sum   (n + m + p) represents numbers ranging from 1 to 10.   3) Use according to claims 1 and 2,   characterized in that fixing products of 2 to 5 moles of oxide are used   ethylene on lauric oils.   4) Use according to claims 1 to 3,   characterized in that fixing products of 2 to 5 moles of oxide are used ethylene on coconut oil.    ) Use according to claims 1 to 4,   characterized in that color-producing preparations (reagent I) are used which are selected from the group consisting of phthalides,   fluoranes, spirobipyrans and triphene compounds nylmethyl.   6) Use according to claims 1 to 5i   characterized in that the bodies producing color (reagent I) are used   amounts of 1 to 10% by weight relative to the solvent.   7) Process for the production of carbon papers for the implementation of the device consisting of a layer producing color and a layer of color developer in which (a) Dissolving preparations producing color (reagent I) in alkoxylated triglycerides, (b) the solutions are introduced into microcapsules, (c) the sheets are coated (in English "CB-sheets") on one side with the microcapsules, and (d) each time is combined with sheets (in English "CF-sheets") which have on one side a developer coating, provided that the sheets CB- and CF are joined so that by mechanical pressure and opening of the microcapsules, the preparations producing color can react   with developers with color development.   8) Method according to claim 7, characterized in that carbon papers having a weight of 35 to g / m2 g / m are manufactured