CA1260172A - Rapidly absorbed printing inks and their use - Google Patents
Rapidly absorbed printing inks and their useInfo
- Publication number
- CA1260172A CA1260172A CA000492298A CA492298A CA1260172A CA 1260172 A CA1260172 A CA 1260172A CA 000492298 A CA000492298 A CA 000492298A CA 492298 A CA492298 A CA 492298A CA 1260172 A CA1260172 A CA 1260172A
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- printing ink
- acid
- weight
- alkyd resin
- unsaturated fatty
- Prior art date
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Abstract
ABSTRACT
RAPIDLY ABSORBED PRINTING INKS AND THEIR USE
The invention relates to a printing ink which con-sists of pigments, an alkyd resin binder modified with fatty acids having an iodine number from 120 to 280 (g of I2/100 g), a phenolic resin-modified rosin binder and, if appropriate, further binders and further conventional constituents, such as lubricants, solvents, thickeners and thixotropic agents. The alkyd resin binder and the pheno-lic resin-modified rosin binder are present in proportions from 10 to 40% by weight and 60 to 90% by weight respec-tively, their sum giving 100% by weight. The alkyd resin has an acid number of less than 11 and a hydroxyl number from 40 to 260 and has been prepared by reacting a) an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides with b) a polyol and c) a dicarboxylic acid.
RAPIDLY ABSORBED PRINTING INKS AND THEIR USE
The invention relates to a printing ink which con-sists of pigments, an alkyd resin binder modified with fatty acids having an iodine number from 120 to 280 (g of I2/100 g), a phenolic resin-modified rosin binder and, if appropriate, further binders and further conventional constituents, such as lubricants, solvents, thickeners and thixotropic agents. The alkyd resin binder and the pheno-lic resin-modified rosin binder are present in proportions from 10 to 40% by weight and 60 to 90% by weight respec-tively, their sum giving 100% by weight. The alkyd resin has an acid number of less than 11 and a hydroxyl number from 40 to 260 and has been prepared by reacting a) an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides with b) a polyol and c) a dicarboxylic acid.
Description
~ 2~
07.08.1984 BASF Farben + Fasern Aktiengesellschaft, Hamburg Rapidly absorbed printing inks and their use The invention relates to printing inks ~hich con-tain, as the binder, phenolic resin-modified rosin in a proportion of 60 to 90% by weight and an alkyd resin in a proportion of 10 to 40X by weight, the sum of phenolic resin-moaifie~ rosin and alkyd resin giving 100% by weight.
The alkyd resin has been prepared from a) an unsaturated fat~y acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b~ a polyol and c) a dScarboxylic acid.
The printing inks also contain pigments, if appro-priate further binders and further conventional constitu-ents, such as lubricants, soLvents, thickeners and thixo-~ropic agen~s.
German Patent Specification 3,023,118 has disclosedpaper printing inks of this type for graphical purposes.
These consis~ of pigments, an alkyd resin binder which has been modified by long-chain fatty acids having an iodine number of less than 20 (determined according to DIN 53,241) and which has an acid number of preferably 6 to lZ and an hydroxyl number of preferably greater than 15 (determinea according to DXN 53,241), in particular from 20 to 35, and, if appropriate, further conventional constituents, such Z5 as lubricants, solvents and a viscosity control agent.
Depending on the field of application, printin~
inks must meet a large number of requirements. For example, printing inks should have a high abrasion resistance and, in many cases, good re-release properties. As far as pos-sible, they should also be free from yellowing, have aneutral odor and be fast-drying. To prepare the printing ' ~
07.08.1984 BASF Farben + Fasern Aktiengesellschaft, Hamburg Rapidly absorbed printing inks and their use The invention relates to printing inks ~hich con-tain, as the binder, phenolic resin-modified rosin in a proportion of 60 to 90% by weight and an alkyd resin in a proportion of 10 to 40X by weight, the sum of phenolic resin-moaifie~ rosin and alkyd resin giving 100% by weight.
The alkyd resin has been prepared from a) an unsaturated fat~y acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b~ a polyol and c) a dScarboxylic acid.
The printing inks also contain pigments, if appro-priate further binders and further conventional constitu-ents, such as lubricants, soLvents, thickeners and thixo-~ropic agen~s.
German Patent Specification 3,023,118 has disclosedpaper printing inks of this type for graphical purposes.
These consis~ of pigments, an alkyd resin binder which has been modified by long-chain fatty acids having an iodine number of less than 20 (determined according to DIN 53,241) and which has an acid number of preferably 6 to lZ and an hydroxyl number of preferably greater than 15 (determinea according to DXN 53,241), in particular from 20 to 35, and, if appropriate, further conventional constituents, such Z5 as lubricants, solvents and a viscosity control agent.
Depending on the field of application, printin~
inks must meet a large number of requirements. For example, printing inks should have a high abrasion resistance and, in many cases, good re-release properties. As far as pos-sible, they should also be free from yellowing, have aneutral odor and be fast-drying. To prepare the printing ' ~
- 2 -ink, the various resins are first dissolved at an elevated temperature in mineral oil, and the pigments are then in-troduced. Subsequently, the printing inks of the compo-sition described above cure by oxidation When the printing inks described in German Patent Specification 3,023,118 and aLso other printing inks are used for the sheet-fed offset and the letterpress process the problem of setting off arises, i.eO printing inks which are well compatible ~ith mineraL oil reLease the ~atter only slo~-y, and consequently the prints remain ~et and therefore require Powdering~ The Powder serves as a spacer for the wet prints in the pile and also allows better access of oxygen for the oxidative drying. How-ever, po~dering has an adverse effect on the quality of the prints and the further processing steps.
The disadvantages of powdering comprise poor abra-sion resistance of the prints, complications in downstream processes, such as varnishing and cellophaning, and con-tamination of the machine.
A review of the disadvantages of powdering in off-set printing is given by W. Walenski in "Der Polygraph", volwme 5, 1984, pages 435-36. This review demonstrates the urgency of the demand for a rapidly absorbed printing ink.
The object of the invention is therefore to avoid these disadvantages of the state of the art and to provide a printing ink which is rapidly absorbed and therefore does not require powdering.
Surprisingly, it has been found that this o~ject is achieved by a printing ink which~ as the binder, contains an alkyd resin having a high hydroxyl number, a lo~ acia number and a high iodine num~er of the fatty acids, in com-bination with a phenol resin-modified rosin. The inven-tion therefore relates to a printing ink of the type des-cribed at the outset, wherein the unsaturated fatty acidshave an iod;ne number of 120 to Z80 (9 of I2/100 9), pre-ferably 120 - 200 (9 of I2/100 9), particularly preferably 120 - 190 (9 of Iz/100 9), and the alkyd resin has an
The disadvantages of powdering comprise poor abra-sion resistance of the prints, complications in downstream processes, such as varnishing and cellophaning, and con-tamination of the machine.
A review of the disadvantages of powdering in off-set printing is given by W. Walenski in "Der Polygraph", volwme 5, 1984, pages 435-36. This review demonstrates the urgency of the demand for a rapidly absorbed printing ink.
The object of the invention is therefore to avoid these disadvantages of the state of the art and to provide a printing ink which is rapidly absorbed and therefore does not require powdering.
Surprisingly, it has been found that this o~ject is achieved by a printing ink which~ as the binder, contains an alkyd resin having a high hydroxyl number, a lo~ acia number and a high iodine num~er of the fatty acids, in com-bination with a phenol resin-modified rosin. The inven-tion therefore relates to a printing ink of the type des-cribed at the outset, wherein the unsaturated fatty acidshave an iod;ne number of 120 to Z80 (9 of I2/100 9), pre-ferably 120 - 200 (9 of I2/100 9), particularly preferably 120 - 190 (9 of Iz/100 9), and the alkyd resin has an
3 --acid number of less than 11 and a hydroxyl number of 40 to 2~0 (mg of KOH/g of resin).
In contrast to German Patent Specification 3,023,118, a type of ~ast-drying oils or fatty acids, ~hich are dis-tinguished by a hi~h iodine number, are used for modifyingthe alkyd resin. The oxidative drying via the double bonds of the highly unsaturated fatty acids or oils is respon-sible for the chemical drying of the printing ink. Good chemical drying is supplemented by physical drying of the printing ink, which car, be determined by the absorption properties. Good physical drying is obtained by the print-ing ink according to the invention. The alkyd resins used as the binders have hydroxyl numbers which are in the range from 40 ~o 260. These hydroxyl numbers~ which are high in comparison with German Patent Specification 3,023,118, cause an increased polarity of the alkyd resin binders. These po~ar alkyd resins have only a limited solubility in mineral oils, which has the resuLt ~hat printing inks containing polar alkyd resins and mineral oil show good a~sorption. Hydroxyl numbers of at least 40 are necessary in order to obtain the polarity required for rapid absorption; the OH number range from 11û to 180 can be indicated as par~icular~y advantageous for the absorption properties. If an a~kyd resin OH number of 260 is exceeded, the poLar alkyd resin is then hardly solub~e in the mineral oil which is the conventional solvent for printing inks.
Refined linseed oil, soya oil or dehydrated castor oil and the fatty acids obtained from these have proved suitable as the unsaturated fatty acids or oils. Trimethy~o~propane, glycerol and/or pentaerythritol are particularly suitable as the po~yol components. The pre~erred dicarboxy~ic acids are phthalic acid, isophtha~ic acid, adipic acid or te~rahydro-phthalic acid, their anhydrides being employed in practice, uhere these exist.
The invention a-so relates to a process ~or pre-paring a printing in~.
A ~atty acid-modified alkyd resin is first prepared from ,~
a~ an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b) a polyol and c) a dicarboxlyic acid.
S This resin is combined with phenolic resin-modified rosin and a mineral oil to give a binder mixture, the proportion of alkyd resin being 10 to 40% by weight and that of the modified rosin being 60 to 90% by weight, based on the total weight of alkyd resin and rosin. This binder mix-ture is dispersed, together with pigments, if appropriatefurther bin~ers and further conventional constituents, such as lubricants, thickeners and thixotropic agents, by means of a dispersing device, for example a three-roll mill, a sand nill or a ba~l mill. The distinctive feature here is that the unsaturated fatty acids have an iodine number from 120 to ~80 ~9 of I2/100 9), preferably 120 to 200 (9 of I2/100 g), particularly preferably 120 to 190 (9 of I2/100 9), and the alkyd resins have a hydroxyl number from 40 to 26Q and an acid number of less than ~1. Refined linseed oil, soya oil or dehydrated castor oil or the fatty acids obtained from these can advantageously be used for modifying the alkyd resins. Suitable polyol components are trimethyLoLpropane, glycerol and/or pentaerythritol, an~
phthalic acid, isophthalic acic~, adipic acid or tetrahydrophthalic acid or their anhydrides, ~here these exist, can be used as the dicarboxylic acid component~
Surprisingly, the printing ink according to the in-vention is also suitable for use in the letterpress process.
The printing inks according to the invention can be used for ~he sheet-fed offset printing process, in which the print is set do~n first on a rubber blanket and from the lat~er to the paper or another printing substrate.
In the sheet-fed offset printing process, cut sheets are printed.
Since the printing inks according to the invention also show good physical drying, in addition to the oxidative drying, in other words are rapidly absorbed, the otherwise required powdering can be omitted. This is a great advaneage, since the powder adversely affects the quality of the prints and makes the further processing steps more difficult.
S With respect to the printing inks according to the invention~ the com~ination of good chemical and physical drying as the result of suitable iodine numbers and hydr-oxyl numbers can be regarded as novel and advantageous.
Measurements of the absorption properties show that the printing inks according to the invention are absorbed more rapidly than the printing inks described in German Patent Specification 3,023,118.
The invention is describe~ in more detail ~elow by reference to illustrative examples~
1,508 par~s by weight of linseed oil fatty acid, 523 parts hy weight of pentaerythritol and 479 parts by weight of isophthalic acid are heated to 250C in a reac-tor under a slow stream of blanketing gas. This temperature ZO is maintained until the hot mixture is clear. The tempera-ture is then aLlowed to drop to 210C, and this tempera-ture is maintained untiL an acid number of Less than 9 has been reached and ~he viscosity is 60 - 70 dPa.s (80~. in bu~yldiglycolj. The OH number of the resin is 111. The resin obtained is dissolved in a mineral oil having a boil-ing range from Z80 to 310C, such that a 70% solution is formed.
Using this resin solution, a printing ink binder of the following composition is preparea:
Phenolic resin-modified rosin 300 parts by weigh~
ALkyd resin, 7ûZ in mineral oil 250 parts by weight Mineral oil, boiling range 280-310C 450 parts by weight 1000 parts by ~eight The resins are dissolved in mineral oil at 220C~
~:6~ 7~
~ith stirring. A printing ink of the following composition is prepared with this binder by means ot a three-roll mi~l:
Blue pigment15 parts by weight Substrates (inorganic fillers, for example CaC03~ Alz03)3 parts by weight Wax 1 part by weight Binder 72 parts by weight Mineral oil7 parts by weight Drier 2 parts by weight .~
100 parts by weight 1,073 parts by weight of refined linseed oil are heated to 200C in a reactor under a slow stream of blanketing gas. 418 parts by weight of pentaerythritol and 2 parts by weight of lithium stearate are then adaed and the mixture is heated to 260C. Transesterification takes place at this temperature. The mixture is then cooled to 210C and S34 parts by weight of isophthalic acid are added. The mixture is then reheated to 240C
and ~his temperature is maintained until the hot mi~ture is clear. The temperature is then allowed to drop to 200C and maintained there, until an acid number of less than 11 is reached and the viscosity is 300 - 400 dPa.s (80X in butyldiglycol)~ The OH number of the resin is 181.
The resin obtained is dissolved in a mineral oil having a boiling range from 280 to 310C, such that a oOX so~ution is formed.
Using this resin solution, a printing ink binder of the following composition is prepared:
Phenolic resin-modified rosin 300 parts by ~eight Alkyd resin, 60% in mineral oil 250 parts by weight Mineral oil, boiling ran0e 280-310C 450 parts by ~eight 1000 parts by weight The resins are disso~ved in the mineral oil at Z20C~ with stirring. A printing ink of the fol~owing composition is preparea with this ~inder by means of a three-roll mi~
5 Blue pigment15 parts by weight Substrates (inorganic fillers) 3 parts by weight Wax 1 part by weight ~inder 70 parts by weight Mineral oil9 parts by weight 10 Drier Z parts by weight 100 parts by weight COMPARATIVE EXAMPLE
For comparison purposes, the printing ink according to example 1 of German Patent Specification 3,023,118 is prepared. The modified alkyd resin is prepared from 1~800 9 of coco nut oil, 569 9 of trimethylo~propane and 797 9 of isophthalic acidO under the conditions indicated therein with the addition of 0.1 9 of lead monoxide and 7 9 of p-to~uo~enesulfonic acid as a crosslinking catalyst, anddiluted ~ith 600 9 of minera~ oil thoiling range 2S0 -2$0C). As described in the exampLe, 10 9 of the aLkyd resin are then pasted with 10 9 of a pigment, 2 9 of a poLy-ethylene wax and 76 9 of a binder so~ution consisting of 32 9 of a phenolic resin-modified rosin resin in 44 9 of mineral oil ~boiling range 270 - 310C).
The absorption properties of the prin~ing inks pre-pared in examples 1 and Z is compared Wittl the absorption properties of the printing ink from the comparative example based on isophthalic acid, coco nut oi~ and trimethy~oL-propane.
The absorption properties are measured by a densito-metric determination, as a function of time, of the quan~ity of ink which is transferred from the printed material to a reverse-printing materia~. It is found here that, in the case of the printing ink clescribed in the comparative , -- 8 ~
example, the optical density on the re~erse-printing material after 15 seconds is 8-10 times higher than the op~ical density oDtained when measuring the printing inks from examples 1 and 2. This means that the ~atter are absorbed significantly more rapidly. The optical den-sities are of comparab~e magnitwde only after abou~ 60 - seconds.
In contrast to German Patent Specification 3,023,118, a type of ~ast-drying oils or fatty acids, ~hich are dis-tinguished by a hi~h iodine number, are used for modifyingthe alkyd resin. The oxidative drying via the double bonds of the highly unsaturated fatty acids or oils is respon-sible for the chemical drying of the printing ink. Good chemical drying is supplemented by physical drying of the printing ink, which car, be determined by the absorption properties. Good physical drying is obtained by the print-ing ink according to the invention. The alkyd resins used as the binders have hydroxyl numbers which are in the range from 40 ~o 260. These hydroxyl numbers~ which are high in comparison with German Patent Specification 3,023,118, cause an increased polarity of the alkyd resin binders. These po~ar alkyd resins have only a limited solubility in mineral oils, which has the resuLt ~hat printing inks containing polar alkyd resins and mineral oil show good a~sorption. Hydroxyl numbers of at least 40 are necessary in order to obtain the polarity required for rapid absorption; the OH number range from 11û to 180 can be indicated as par~icular~y advantageous for the absorption properties. If an a~kyd resin OH number of 260 is exceeded, the poLar alkyd resin is then hardly solub~e in the mineral oil which is the conventional solvent for printing inks.
Refined linseed oil, soya oil or dehydrated castor oil and the fatty acids obtained from these have proved suitable as the unsaturated fatty acids or oils. Trimethy~o~propane, glycerol and/or pentaerythritol are particularly suitable as the po~yol components. The pre~erred dicarboxy~ic acids are phthalic acid, isophtha~ic acid, adipic acid or te~rahydro-phthalic acid, their anhydrides being employed in practice, uhere these exist.
The invention a-so relates to a process ~or pre-paring a printing in~.
A ~atty acid-modified alkyd resin is first prepared from ,~
a~ an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b) a polyol and c) a dicarboxlyic acid.
S This resin is combined with phenolic resin-modified rosin and a mineral oil to give a binder mixture, the proportion of alkyd resin being 10 to 40% by weight and that of the modified rosin being 60 to 90% by weight, based on the total weight of alkyd resin and rosin. This binder mix-ture is dispersed, together with pigments, if appropriatefurther bin~ers and further conventional constituents, such as lubricants, thickeners and thixotropic agents, by means of a dispersing device, for example a three-roll mill, a sand nill or a ba~l mill. The distinctive feature here is that the unsaturated fatty acids have an iodine number from 120 to ~80 ~9 of I2/100 9), preferably 120 to 200 (9 of I2/100 g), particularly preferably 120 to 190 (9 of I2/100 9), and the alkyd resins have a hydroxyl number from 40 to 26Q and an acid number of less than ~1. Refined linseed oil, soya oil or dehydrated castor oil or the fatty acids obtained from these can advantageously be used for modifying the alkyd resins. Suitable polyol components are trimethyLoLpropane, glycerol and/or pentaerythritol, an~
phthalic acid, isophthalic acic~, adipic acid or tetrahydrophthalic acid or their anhydrides, ~here these exist, can be used as the dicarboxylic acid component~
Surprisingly, the printing ink according to the in-vention is also suitable for use in the letterpress process.
The printing inks according to the invention can be used for ~he sheet-fed offset printing process, in which the print is set do~n first on a rubber blanket and from the lat~er to the paper or another printing substrate.
In the sheet-fed offset printing process, cut sheets are printed.
Since the printing inks according to the invention also show good physical drying, in addition to the oxidative drying, in other words are rapidly absorbed, the otherwise required powdering can be omitted. This is a great advaneage, since the powder adversely affects the quality of the prints and makes the further processing steps more difficult.
S With respect to the printing inks according to the invention~ the com~ination of good chemical and physical drying as the result of suitable iodine numbers and hydr-oxyl numbers can be regarded as novel and advantageous.
Measurements of the absorption properties show that the printing inks according to the invention are absorbed more rapidly than the printing inks described in German Patent Specification 3,023,118.
The invention is describe~ in more detail ~elow by reference to illustrative examples~
1,508 par~s by weight of linseed oil fatty acid, 523 parts hy weight of pentaerythritol and 479 parts by weight of isophthalic acid are heated to 250C in a reac-tor under a slow stream of blanketing gas. This temperature ZO is maintained until the hot mixture is clear. The tempera-ture is then aLlowed to drop to 210C, and this tempera-ture is maintained untiL an acid number of Less than 9 has been reached and ~he viscosity is 60 - 70 dPa.s (80~. in bu~yldiglycolj. The OH number of the resin is 111. The resin obtained is dissolved in a mineral oil having a boil-ing range from Z80 to 310C, such that a 70% solution is formed.
Using this resin solution, a printing ink binder of the following composition is preparea:
Phenolic resin-modified rosin 300 parts by weigh~
ALkyd resin, 7ûZ in mineral oil 250 parts by weight Mineral oil, boiling range 280-310C 450 parts by weight 1000 parts by ~eight The resins are dissolved in mineral oil at 220C~
~:6~ 7~
~ith stirring. A printing ink of the following composition is prepared with this binder by means ot a three-roll mi~l:
Blue pigment15 parts by weight Substrates (inorganic fillers, for example CaC03~ Alz03)3 parts by weight Wax 1 part by weight Binder 72 parts by weight Mineral oil7 parts by weight Drier 2 parts by weight .~
100 parts by weight 1,073 parts by weight of refined linseed oil are heated to 200C in a reactor under a slow stream of blanketing gas. 418 parts by weight of pentaerythritol and 2 parts by weight of lithium stearate are then adaed and the mixture is heated to 260C. Transesterification takes place at this temperature. The mixture is then cooled to 210C and S34 parts by weight of isophthalic acid are added. The mixture is then reheated to 240C
and ~his temperature is maintained until the hot mi~ture is clear. The temperature is then allowed to drop to 200C and maintained there, until an acid number of less than 11 is reached and the viscosity is 300 - 400 dPa.s (80X in butyldiglycol)~ The OH number of the resin is 181.
The resin obtained is dissolved in a mineral oil having a boiling range from 280 to 310C, such that a oOX so~ution is formed.
Using this resin solution, a printing ink binder of the following composition is prepared:
Phenolic resin-modified rosin 300 parts by ~eight Alkyd resin, 60% in mineral oil 250 parts by weight Mineral oil, boiling ran0e 280-310C 450 parts by ~eight 1000 parts by weight The resins are disso~ved in the mineral oil at Z20C~ with stirring. A printing ink of the fol~owing composition is preparea with this ~inder by means of a three-roll mi~
5 Blue pigment15 parts by weight Substrates (inorganic fillers) 3 parts by weight Wax 1 part by weight ~inder 70 parts by weight Mineral oil9 parts by weight 10 Drier Z parts by weight 100 parts by weight COMPARATIVE EXAMPLE
For comparison purposes, the printing ink according to example 1 of German Patent Specification 3,023,118 is prepared. The modified alkyd resin is prepared from 1~800 9 of coco nut oil, 569 9 of trimethylo~propane and 797 9 of isophthalic acidO under the conditions indicated therein with the addition of 0.1 9 of lead monoxide and 7 9 of p-to~uo~enesulfonic acid as a crosslinking catalyst, anddiluted ~ith 600 9 of minera~ oil thoiling range 2S0 -2$0C). As described in the exampLe, 10 9 of the aLkyd resin are then pasted with 10 9 of a pigment, 2 9 of a poLy-ethylene wax and 76 9 of a binder so~ution consisting of 32 9 of a phenolic resin-modified rosin resin in 44 9 of mineral oil ~boiling range 270 - 310C).
The absorption properties of the prin~ing inks pre-pared in examples 1 and Z is compared Wittl the absorption properties of the printing ink from the comparative example based on isophthalic acid, coco nut oi~ and trimethy~oL-propane.
The absorption properties are measured by a densito-metric determination, as a function of time, of the quan~ity of ink which is transferred from the printed material to a reverse-printing materia~. It is found here that, in the case of the printing ink clescribed in the comparative , -- 8 ~
example, the optical density on the re~erse-printing material after 15 seconds is 8-10 times higher than the op~ical density oDtained when measuring the printing inks from examples 1 and 2. This means that the ~atter are absorbed significantly more rapidly. The optical den-sities are of comparab~e magnitwde only after abou~ 60 - seconds.
Claims (20)
1. A process for preparing a printing ink for offset or letterpress printing, in which an alkyd resin is first prepared from a) an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b) a polyol, and c) a dicarboxylic acid, and a printing ink binder is then prepared from the alkyd resin used in a proportion of 10 to 40% by weight together with a phenolic resin-modified rosin in a proportion of 60 to 90% by weight, the total amount of alkyd resin and phenolic resin-modified rosin giving 100% by weight, and a mineral oil and pigments are dispersed in the printing ink binder thus prepared, wherein the unsaturated fatty acid used has an iodine number of from 120 to 280 (g of I2/100 g) and the alkyd resin has a hydroxyl number of at least 110 and not more than 260 (mg of KOHjg of resin) and an acid number of less than 11.
2. A process according to claim 1, wherein the unsaturated fatty acid has an iodine number of from 120 to 220 (g of I2/100g).
3. A process according to claim 2, wherein the unsaturated fatty acid has an iodine number of from 120 to 190 (g of I2/100 g).
4. A process according to claim 1, wherein the alkyd resin has a hydroxyl number of from 110 to 180.
5. A process according to claim 1, wherein the unsaturated fatty acid or triglyceride is derived from refined linseed oil, soya oil or dehydrated castor oil.
6. A process according to claim 1, wherein polyol is selected from the group consisting of tri-methylolpropane, glycerol, pentaerythritol and mixtures thereof.
7. A process according to claim 1, wherein the dicarhoxylic acid is selected from the group consisting of phthalic acid, isophthalic acid, adipic acid, tetrahydrophthalic acid and anhydrides thereof.
8. A process according to claim 1, wherein further binding agents are dispersed in the printing ink binder.
9. A process according to claim 1, wherein at least one additive selected from the group consisting of lubricants, solvents, thickeners and thixotropic agents is dispersed in the printing ink binder.
10. A printing ink for offset or letterpress print-ing containing as a binder:
A) a phenolic resin-modified rosin in a proportion of 60 to 90% by weight, and B) an alkyd resin in a proportion of 10 to 40% by weight, the total amount of (A) and (B) giving 100% by weight, the alkyd resin having been prepared from:
a) an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b) a polyol, and c) a dicarboxylic acid, and pigments, wherein the unsaturated fatty acid has an iodine number from 120 to 280 (g of I2/100 g) and the alkyd resin has a hydroxyl number of at least 110 and not more than 260 (mg of KOH/g of resin) and an acid number of less than 11.
A) a phenolic resin-modified rosin in a proportion of 60 to 90% by weight, and B) an alkyd resin in a proportion of 10 to 40% by weight, the total amount of (A) and (B) giving 100% by weight, the alkyd resin having been prepared from:
a) an unsaturated fatty acid having 6 to 20 carbon atoms or a mixture of such acids or their triglycerides, b) a polyol, and c) a dicarboxylic acid, and pigments, wherein the unsaturated fatty acid has an iodine number from 120 to 280 (g of I2/100 g) and the alkyd resin has a hydroxyl number of at least 110 and not more than 260 (mg of KOH/g of resin) and an acid number of less than 11.
11. A printing ink as claimed in claim 10, wherein the unsaturated fatty acid has an iodine number of from 120 to 220 (g of I2/100g).
12. A printing ink as claimed in claim 11, wherein the unsaturated fatty acid has an iodine number of from 120 to 190 (g of I2/100 g).
13. A printing ink as claimed in claim 10, wherein the alkyd resin has a hydroxyl number of from 110 to 180.
14. A printing ink as claimed in claim 10, wherein the unsaturated fatty acid or triglyceride is derived from refined linseed oil, soya oil or dehy-drated castor oil.
15. A printing ink as claimed in claim 10, wherein polyol is selected from the group consisting of trimethylolpropane, glycerol, pentaerythritol and mixtures thereof.
16. A printing ink as claimed in claim 10, wherein the dicarboxylic acid is selected from the group consisting of phthalic acid, isophthalic acid, adipic acid, tetrahydrophthalic acid and anhydrides thereof.
17. A printing ink as claimed in claim 10, further containing additional binders.
18. A printing ink as claimed in claim 10, further containing at least one additive selected from the group consisting of lubricants, solvents, thick-eners and thixotropic agents.
19. A sheet-fed offset process, wherein use is made of a printing ink as defined in claims 10, 11 or 12, without powdering the printed products.
20. A letterpress process, wherein use is made of a printing ink as defined in claims 10, 11 or 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000492298A CA1260172A (en) | 1985-10-04 | 1985-10-04 | Rapidly absorbed printing inks and their use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000492298A CA1260172A (en) | 1985-10-04 | 1985-10-04 | Rapidly absorbed printing inks and their use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260172A true CA1260172A (en) | 1989-09-26 |
Family
ID=4131546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000492298A Expired CA1260172A (en) | 1985-10-04 | 1985-10-04 | Rapidly absorbed printing inks and their use |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1260172A (en) |
-
1985
- 1985-10-04 CA CA000492298A patent/CA1260172A/en not_active Expired
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| MKEX | Expiry |