CA1098234A - Drawing and painting element in the form of school chalk for producing images adapted to be fixed by the use of heat - Google Patents
Drawing and painting element in the form of school chalk for producing images adapted to be fixed by the use of heatInfo
- Publication number
- CA1098234A CA1098234A CA287,240A CA287240A CA1098234A CA 1098234 A CA1098234 A CA 1098234A CA 287240 A CA287240 A CA 287240A CA 1098234 A CA1098234 A CA 1098234A
- Authority
- CA
- Canada
- Prior art keywords
- stick
- heat
- weight
- images
- painting
- 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.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Toys (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Although it is known to produce images, writings or drawings by the use of conventional chalks and crayons, such images cannot be permanently fixed by simple means. Therefore, enamels are sometimes used to produce a permanent image. How-ever, such enamels are expensive and require firing at high temperatures. The present invention overcomes these problems by providing a drawing and painting stick, in the form of school chalk, for producing images adapted to be fixed by the use of heat. By means of such a stick, images, writing, drawings, and the like may be produced in the usual manner upon a base and then be permanently fixed by the application of moderate temperatures. Thus, the drawing and painting stick according to the invention allows the user to produce designs or drawings as if conventional chalks were being used, and then to fix them permanently, very quickly and simply, so that they adhere firmly and are impact-resistant. The stick comprises a major proportion of a thermoplastic or heat-curable thermosetting synthetic resin composition together with colouring matter including at least 5% by weight of the stick of pigment.
Although it is known to produce images, writings or drawings by the use of conventional chalks and crayons, such images cannot be permanently fixed by simple means. Therefore, enamels are sometimes used to produce a permanent image. How-ever, such enamels are expensive and require firing at high temperatures. The present invention overcomes these problems by providing a drawing and painting stick, in the form of school chalk, for producing images adapted to be fixed by the use of heat. By means of such a stick, images, writing, drawings, and the like may be produced in the usual manner upon a base and then be permanently fixed by the application of moderate temperatures. Thus, the drawing and painting stick according to the invention allows the user to produce designs or drawings as if conventional chalks were being used, and then to fix them permanently, very quickly and simply, so that they adhere firmly and are impact-resistant. The stick comprises a major proportion of a thermoplastic or heat-curable thermosetting synthetic resin composition together with colouring matter including at least 5% by weight of the stick of pigment.
Description
3~
The present invention re:Lates to a drawing and painting stick in the form of school chalk for producing images adapted to be fixed by the use of heat.
Already known are drawing and painting sticks in the form of rods of varying thicknesses made from pressed lime and/or gypsum and posslbly colour-producing pigments.
Images, writing, or drawings produced with chalks of this kind cannot be permanently fixed by simple means, and the same applies to most crayons on the market.
It is also known how to produce coloured designs upon ceramic and metal panels or the like by applying thereto a paste of meltable mineral powders and by then heating these powders to a molten condition. This process requires two operations, namely, first operation of applying to a panel a covering coat of a so-called base enamel followed by the application of a coloured design to this enamel, and then the second and separate operation of baking the panel.
These processes operate at temperatures of about 800C and require expensive enamels or coloured covering ena-mel powders the colours of which do not always turn out cor-rectly after firing. Thus the production of coloured designs by enamelling requires the use of a special and expensive kiln to produce the desired firing temperatures. It also re-quires considerable technical knowledge. This militates against the general use of such processes, by hobbyists for example, for the purpose of producing permanent coloured designs or images on stable bases such as sheet metal, glass, or the like.
Also known are crayons made of pigments and synthe-tic materials. However, since these materials have leadsmade of a hard fusible substance like pencil leads, they are not suita~le for forming drawing or painting sticks in the 3~
form of school chalks which can be used for producing images which can also be fixed upon bases by the use of heat.
Thus German OS 2 255 519 discloses a marking pencil consisting of a powdered pigment, a thermoplastic resin, metal soaps and other additives, and characterized in that it contains as a thermoplastic resin, an epoxy resin which is solid and unhardened at room temperature, and in addition pos-sibly other thermoplastlc synthetic resins. This mi.xture of resin and additives is extruded into leads at temperatures of at least 140C, and these are then processed into pencil leads of varying degrees of hardness.
In contrast to this, it is the purpose of the inven-tion to provide a drawing and painting stlck, in the form of school chalk for producing images adapted to be fixed by the use of heat, by means of said e:Lement images, writing, drawings, and the like may be produced in the usual manner upon a base, upon which they may then be permanently fixed by the use of temperatures of typically only about 200C~
The invention thus.relates to a drawing and painting stick, in the form of school cha~ for producing imagQs adapted to be fixed by the use of heat, said stick being formed of a finely powdered mixture of colouring matter including at least one pigment and a bonding agent consisting of a composition containing at least one thermoplastic or heat-curable synthe-~ic resin, said composition being capable of melting and/or curing under the influence of heat to orm a vehicle for said colouring matter, the powdered mixture being pressure bonded, ~
at a temperature below the melting or curing temperature of ~ ;
the resin com~osition, to form a rigid stick containing at least 5% by weight of pigment and a major proportion of syn-thetic resin compositionO
The synthetic resin composition is prefe~ably a mixture of an epoxy resin and apolyester resin in a weight ~9~Z3~
ratio of be-tween 0.5:1 and 1.5:1, preferably 1:1. The colou-ring matter may include at least one dye soluble in the syn-thetic resin composition.
A preferred method of forming the stick comprises mixing the powdered constituents and applying high pressure thereto at room temperature, preferably in an extrusion press.
The mixture is then cooled, bxoken up and ground to a maximum particle size of 60 ~m. The powdered mixture thus obtained is then pressed into drawing or painting sticks at room tem-perature and at a pressure of 90 bars. Individual drawing orpainting sticks may also be cu~ from a previously pressed block.
A layer cf lacquer is then preferably applied to the sticks thus obtained. This not only increases their strength, but also largely prevents the user from dirtying his fingers. Instead of, or as wel:L as, the layer of lacquer, a wrapping of aluminum foil, paper, wood, or the like may be provided.
The synthetic resin composition utilized in sticks a~cording to the invention may also contain in addition to synthetic resins, plasticizers, fillers, extenders and other additives cust~marily present in thermoplastic or thermoset-ting resins.
~ As already indicated, the drawing and painting stick according to the invention may be used for producing images and the like which may then be permanently fixed by the use of heat. These images, or the like t may be produced upon any desired base which can withstand the heat-treatment temperature, for instance sheet metal, stoneware, glass, wood, synthetic materials, etc.
If the base is a good heat conductor, the design may be fixed thereon merely by heating the base from below until the material applied adheres to the base and/or, if use !. '' .
3~
is made of a thermosetting synthet:ic resin incorporating a hardener, until it hardens, which usually takes only a few minutes.
sases which are not good heat conductors may be heated from above or in a sto~e, after the drawing has been applied, the temperature used being governed by the softening or setting temperature of the synthetic resin, usually between 50 and 300C. The images may therefore also be fixed on a hot-plate or in a domestic oven, or the like.
As may be gathered from the foregoing, the drawing and painting stick according to the invention allows the user to produce designs or drawing$ as if he were using conventio-nal chalks, and then to ~ix them permanently, very ~uickly and simply, like enamels, so that they adhere firmly and are impact-resistant. Images produced with the sticks according to the invention are resistant, after they have been fired, to weathering and are largely resistant to attack by chemicals and solvents. Moreover, the surface of the image has consi-derable mechanical strength. All of these advantageous proper-ties make it possible ko display the images or the like, pro-duced rapidly and simply with the sticks according to the invention, in highly exposed locations.
The invention is illustrated in further detail by the following examples:
Example 1:
~Iigh-molecular weight, acid-group containing polyester resin (M.W. 3200; softening 54 parts by point 95-121C; sp.wt. 1~19g/cm3)weight Triglycidylisocyanurate (M.W. 300; M.P. 7 parts by 94C ~ 3C; sp.wt~ 1.46g/cm3) weight Flow-promoting agent (polyacrylic acid-n- 1 part by butyl ester; sp.wt. 1~05g/cm )weigh~
Titanium dioxide 5 part~ by weight ~4~
3~
Diazo red pigment (Color Index Piqment 6 parts by weight Red 166; sp.wt~ 1.49g/cm ) The above materials are premixed for about 10 minutes in a twmbler and extruded in an extrusion press at a temperature of about 130 C and a residen~e time of about 1 minute. After cooling, the material is ground in a mill to a grain size of at most 50 ~m and the powder is then sieved on a screen. There~
after, the powder is pressed on a press at about 90 kp/cni2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in powder form may be premixed and directly pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
xample 2:
Epoxy resin, bisphenol A-base~epichlorohydrint 32 parts by type 1004 (wt. average M.W. 4000; mean M.W. weight 1200; M.P. 69-75 C; sp.wt. l.l9g/cm3) High-molecular weiyht, acid-group containing 32 parts by polyes~er resin (M~W. 3200; so~tening pt~ weight ; 100-120 C; sp.wt. l.l9g/cm3) Flow-promoting agent ~polyacrylic acid-n- 1 part by butylester; sp.wt. 1.05g/cm ~ weight Titanium dioxide 10 parts by weight Copper phthalocyanine ~-modification (Color 3 parts by Index Pigment Blue 15, No. 74160; MoW~ weight 576.3; sp.wt. 1.62g/cm3) The above materials are premixed for about 10 minutes in a tumbler and extruded in an extrusion press at a temperature of about 125C and a residence time of about 1 minute. After cooling, the material is comminuted in a mill to a grain size of at most 60 ~m and the powder is then sieved on a screen.
~ J9823LS~
Thereafterr -the powder is pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in powder form may be premix~d and directly pressed on a press at about 90 kp/cm into colouring and drawing elements in the form of blackboard-chalk type sticks.
Example 3:
Epoxy resin, bisphenol A-base~epichlorohydrin, 50 parts by type 1004 (wt. ave. M.W. 4000; mean M.W. weight 1200; M~P. 69-75aC; sp.wt. l.l9g/cm3) Dicyandiamide derivative epoxy hardener 1.9 parts by (tolyl-xylyl-biguamide; M.W. 210; M.P. weight 100-120C) Flow-promoting agent (polyacrylic acid-n- 1 part by butyl ester; sp.wt.l.05g/cm3) weight Titanium dioxide 10 parts by weight Chlorinated copper phthalocyanine (Color 3 parts by Index Pigment Green 7, No. 74260; M.W. weight 271.7; sp.wt. 2.13g/cm33 The above materials are premixed for about 10 minutes in a tumbler and extruded on an extrusion prsss at a temperature of about 100C and a residence time of about 1 minute. After cooling, the material is ground in a mill to a grain size of at most 60 ~m and the powder is then sieved on a screen. There-after, the powder is pressed on a press at about 90 kp~cm2 into ~ ;
colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in the form of powder may be premixed and directly pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
3~
Example 4:
.
Adukt (Trade Mark) B 1065: 14.0 parts by (Composîtion blocked isophorone diisocyanate; weight Melting point: 70-78C;
Specific Weight~ about 1.13g/cm3) Crelan (Trade Mark) U 502: 42.0 parts by (Composition: oil-free polyester based on weight terephthalic acid;
Softening point: about 15C;
specific weight: about 1.05g/cm3) Flow improving agent tpolyacrylic acid-n~ 1.0 part by butyl ester) weight (Acronal (Trade Mark) 4F) 37.5 parts by Titanium dioxide weight Irgalite (Trade Mark) Yellow 2 GF: 3.5 parts by (Composikion: diarylide-o-anisidide, weight Pigment Yellow 17; Specific weight: 1.36 g/cm3.) The above formulation was processed as indicated in the preceding examples to produce a yellow polyurethane base drawing element in the form of a blackboard-chalk-like stick.
Example 5:
Acrylic resin (VP-LM 36/41) 71.5 parts by weight Sebacic acid 8.5 parts by weight Epoxy resin (Araldit (Trade Mark) 2.0 parts by weight GT 6071) Titanium dioxide 11.0 parts by weight Copper phthalocyanine (Heliogen 2.0 parts by weight Green CI 872:L2) Organic dye (Irgalite yellow 2 GF) 5O0 parts by weight Acrylic Resin VP-hM 36/41O 71.5 parts by weight (Composition: (meth)acrylic resin containing epoxide groups and capable of linking with polycarboxylic acid;
molecular weigh-t: about 20,000;
rnelting point: 70 - 80C;
specific weight: l.lg/cm3.) Sebaclc Acid 8.5 parts by welght Epoxy Resin Araldit (Trade Mark) GT 6071 2.0 parts by weight (Composition: epoxide resin based on bisphenol A and epichlorohydrin;
molecular weight: about 4,000;
melting point: about 50C;
specific weight: about 1.2 g/cm3~
Titanium dioxide 11.0 parts by weight Heliogen (Trade Mark) Green 87212: 2.0 parts by weight (Composition: chlorinated copper phthalocyanine, Pigment Green 7, (C.I. No. 74260; molecular weight:
271.~;
specific weight: 2.13 g/cm3.) Organic dye (Irgalite Yellow 2GF) 5.0 parts by weight This formulation was processed as in the preceding example to produce a chalky, friable acrylic base drawing stick.
The bending strength of th~ drawing and coloring ~ticks obtained in the foregoing examples was determined according to the method of 'JIS S-6005-1971. This strength- ; `
measuring method is conducted as follows~
A drawing and coloring element in the form of a ~ -blackboard-chalk-like stick having a square cross-section of 10 x 10 mm is laid with its centre between two supporting points. The concentrated minimum load that can break the stick is measured and the flexural strength is calculated by the following formula:
BPL
xd2 wherein f designates the bending strength (g/mm2), P stands for the minimum concentrated load (g) on the center that can break the load, L indicates the distance (mm) betw~en the two supporting points (usually adjusted to 60 mm), and d designates the cross-sectlonal dimension of the stick.
Tlle results are as set forth in the following Table Example bending s~rength . _. , . .
1 64.~
The present invention re:Lates to a drawing and painting stick in the form of school chalk for producing images adapted to be fixed by the use of heat.
Already known are drawing and painting sticks in the form of rods of varying thicknesses made from pressed lime and/or gypsum and posslbly colour-producing pigments.
Images, writing, or drawings produced with chalks of this kind cannot be permanently fixed by simple means, and the same applies to most crayons on the market.
It is also known how to produce coloured designs upon ceramic and metal panels or the like by applying thereto a paste of meltable mineral powders and by then heating these powders to a molten condition. This process requires two operations, namely, first operation of applying to a panel a covering coat of a so-called base enamel followed by the application of a coloured design to this enamel, and then the second and separate operation of baking the panel.
These processes operate at temperatures of about 800C and require expensive enamels or coloured covering ena-mel powders the colours of which do not always turn out cor-rectly after firing. Thus the production of coloured designs by enamelling requires the use of a special and expensive kiln to produce the desired firing temperatures. It also re-quires considerable technical knowledge. This militates against the general use of such processes, by hobbyists for example, for the purpose of producing permanent coloured designs or images on stable bases such as sheet metal, glass, or the like.
Also known are crayons made of pigments and synthe-tic materials. However, since these materials have leadsmade of a hard fusible substance like pencil leads, they are not suita~le for forming drawing or painting sticks in the 3~
form of school chalks which can be used for producing images which can also be fixed upon bases by the use of heat.
Thus German OS 2 255 519 discloses a marking pencil consisting of a powdered pigment, a thermoplastic resin, metal soaps and other additives, and characterized in that it contains as a thermoplastic resin, an epoxy resin which is solid and unhardened at room temperature, and in addition pos-sibly other thermoplastlc synthetic resins. This mi.xture of resin and additives is extruded into leads at temperatures of at least 140C, and these are then processed into pencil leads of varying degrees of hardness.
In contrast to this, it is the purpose of the inven-tion to provide a drawing and painting stlck, in the form of school chalk for producing images adapted to be fixed by the use of heat, by means of said e:Lement images, writing, drawings, and the like may be produced in the usual manner upon a base, upon which they may then be permanently fixed by the use of temperatures of typically only about 200C~
The invention thus.relates to a drawing and painting stick, in the form of school cha~ for producing imagQs adapted to be fixed by the use of heat, said stick being formed of a finely powdered mixture of colouring matter including at least one pigment and a bonding agent consisting of a composition containing at least one thermoplastic or heat-curable synthe-~ic resin, said composition being capable of melting and/or curing under the influence of heat to orm a vehicle for said colouring matter, the powdered mixture being pressure bonded, ~
at a temperature below the melting or curing temperature of ~ ;
the resin com~osition, to form a rigid stick containing at least 5% by weight of pigment and a major proportion of syn-thetic resin compositionO
The synthetic resin composition is prefe~ably a mixture of an epoxy resin and apolyester resin in a weight ~9~Z3~
ratio of be-tween 0.5:1 and 1.5:1, preferably 1:1. The colou-ring matter may include at least one dye soluble in the syn-thetic resin composition.
A preferred method of forming the stick comprises mixing the powdered constituents and applying high pressure thereto at room temperature, preferably in an extrusion press.
The mixture is then cooled, bxoken up and ground to a maximum particle size of 60 ~m. The powdered mixture thus obtained is then pressed into drawing or painting sticks at room tem-perature and at a pressure of 90 bars. Individual drawing orpainting sticks may also be cu~ from a previously pressed block.
A layer cf lacquer is then preferably applied to the sticks thus obtained. This not only increases their strength, but also largely prevents the user from dirtying his fingers. Instead of, or as wel:L as, the layer of lacquer, a wrapping of aluminum foil, paper, wood, or the like may be provided.
The synthetic resin composition utilized in sticks a~cording to the invention may also contain in addition to synthetic resins, plasticizers, fillers, extenders and other additives cust~marily present in thermoplastic or thermoset-ting resins.
~ As already indicated, the drawing and painting stick according to the invention may be used for producing images and the like which may then be permanently fixed by the use of heat. These images, or the like t may be produced upon any desired base which can withstand the heat-treatment temperature, for instance sheet metal, stoneware, glass, wood, synthetic materials, etc.
If the base is a good heat conductor, the design may be fixed thereon merely by heating the base from below until the material applied adheres to the base and/or, if use !. '' .
3~
is made of a thermosetting synthet:ic resin incorporating a hardener, until it hardens, which usually takes only a few minutes.
sases which are not good heat conductors may be heated from above or in a sto~e, after the drawing has been applied, the temperature used being governed by the softening or setting temperature of the synthetic resin, usually between 50 and 300C. The images may therefore also be fixed on a hot-plate or in a domestic oven, or the like.
As may be gathered from the foregoing, the drawing and painting stick according to the invention allows the user to produce designs or drawing$ as if he were using conventio-nal chalks, and then to ~ix them permanently, very ~uickly and simply, like enamels, so that they adhere firmly and are impact-resistant. Images produced with the sticks according to the invention are resistant, after they have been fired, to weathering and are largely resistant to attack by chemicals and solvents. Moreover, the surface of the image has consi-derable mechanical strength. All of these advantageous proper-ties make it possible ko display the images or the like, pro-duced rapidly and simply with the sticks according to the invention, in highly exposed locations.
The invention is illustrated in further detail by the following examples:
Example 1:
~Iigh-molecular weight, acid-group containing polyester resin (M.W. 3200; softening 54 parts by point 95-121C; sp.wt. 1~19g/cm3)weight Triglycidylisocyanurate (M.W. 300; M.P. 7 parts by 94C ~ 3C; sp.wt~ 1.46g/cm3) weight Flow-promoting agent (polyacrylic acid-n- 1 part by butyl ester; sp.wt. 1~05g/cm )weigh~
Titanium dioxide 5 part~ by weight ~4~
3~
Diazo red pigment (Color Index Piqment 6 parts by weight Red 166; sp.wt~ 1.49g/cm ) The above materials are premixed for about 10 minutes in a twmbler and extruded in an extrusion press at a temperature of about 130 C and a residen~e time of about 1 minute. After cooling, the material is ground in a mill to a grain size of at most 50 ~m and the powder is then sieved on a screen. There~
after, the powder is pressed on a press at about 90 kp/cni2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in powder form may be premixed and directly pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
xample 2:
Epoxy resin, bisphenol A-base~epichlorohydrint 32 parts by type 1004 (wt. average M.W. 4000; mean M.W. weight 1200; M.P. 69-75 C; sp.wt. l.l9g/cm3) High-molecular weiyht, acid-group containing 32 parts by polyes~er resin (M~W. 3200; so~tening pt~ weight ; 100-120 C; sp.wt. l.l9g/cm3) Flow-promoting agent ~polyacrylic acid-n- 1 part by butylester; sp.wt. 1.05g/cm ~ weight Titanium dioxide 10 parts by weight Copper phthalocyanine ~-modification (Color 3 parts by Index Pigment Blue 15, No. 74160; MoW~ weight 576.3; sp.wt. 1.62g/cm3) The above materials are premixed for about 10 minutes in a tumbler and extruded in an extrusion press at a temperature of about 125C and a residence time of about 1 minute. After cooling, the material is comminuted in a mill to a grain size of at most 60 ~m and the powder is then sieved on a screen.
~ J9823LS~
Thereafterr -the powder is pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in powder form may be premix~d and directly pressed on a press at about 90 kp/cm into colouring and drawing elements in the form of blackboard-chalk type sticks.
Example 3:
Epoxy resin, bisphenol A-base~epichlorohydrin, 50 parts by type 1004 (wt. ave. M.W. 4000; mean M.W. weight 1200; M~P. 69-75aC; sp.wt. l.l9g/cm3) Dicyandiamide derivative epoxy hardener 1.9 parts by (tolyl-xylyl-biguamide; M.W. 210; M.P. weight 100-120C) Flow-promoting agent (polyacrylic acid-n- 1 part by butyl ester; sp.wt.l.05g/cm3) weight Titanium dioxide 10 parts by weight Chlorinated copper phthalocyanine (Color 3 parts by Index Pigment Green 7, No. 74260; M.W. weight 271.7; sp.wt. 2.13g/cm33 The above materials are premixed for about 10 minutes in a tumbler and extruded on an extrusion prsss at a temperature of about 100C and a residence time of about 1 minute. After cooling, the material is ground in a mill to a grain size of at most 60 ~m and the powder is then sieved on a screen. There-after, the powder is pressed on a press at about 90 kp~cm2 into ~ ;
colouring and drawing elements in the form of blackboard-chalk type sticks.
According to a variant, the raw materials present in the form of powder may be premixed and directly pressed on a press at about 90 kp/cm2 into colouring and drawing elements in the form of blackboard-chalk type sticks.
3~
Example 4:
.
Adukt (Trade Mark) B 1065: 14.0 parts by (Composîtion blocked isophorone diisocyanate; weight Melting point: 70-78C;
Specific Weight~ about 1.13g/cm3) Crelan (Trade Mark) U 502: 42.0 parts by (Composition: oil-free polyester based on weight terephthalic acid;
Softening point: about 15C;
specific weight: about 1.05g/cm3) Flow improving agent tpolyacrylic acid-n~ 1.0 part by butyl ester) weight (Acronal (Trade Mark) 4F) 37.5 parts by Titanium dioxide weight Irgalite (Trade Mark) Yellow 2 GF: 3.5 parts by (Composikion: diarylide-o-anisidide, weight Pigment Yellow 17; Specific weight: 1.36 g/cm3.) The above formulation was processed as indicated in the preceding examples to produce a yellow polyurethane base drawing element in the form of a blackboard-chalk-like stick.
Example 5:
Acrylic resin (VP-LM 36/41) 71.5 parts by weight Sebacic acid 8.5 parts by weight Epoxy resin (Araldit (Trade Mark) 2.0 parts by weight GT 6071) Titanium dioxide 11.0 parts by weight Copper phthalocyanine (Heliogen 2.0 parts by weight Green CI 872:L2) Organic dye (Irgalite yellow 2 GF) 5O0 parts by weight Acrylic Resin VP-hM 36/41O 71.5 parts by weight (Composition: (meth)acrylic resin containing epoxide groups and capable of linking with polycarboxylic acid;
molecular weigh-t: about 20,000;
rnelting point: 70 - 80C;
specific weight: l.lg/cm3.) Sebaclc Acid 8.5 parts by welght Epoxy Resin Araldit (Trade Mark) GT 6071 2.0 parts by weight (Composition: epoxide resin based on bisphenol A and epichlorohydrin;
molecular weight: about 4,000;
melting point: about 50C;
specific weight: about 1.2 g/cm3~
Titanium dioxide 11.0 parts by weight Heliogen (Trade Mark) Green 87212: 2.0 parts by weight (Composition: chlorinated copper phthalocyanine, Pigment Green 7, (C.I. No. 74260; molecular weight:
271.~;
specific weight: 2.13 g/cm3.) Organic dye (Irgalite Yellow 2GF) 5.0 parts by weight This formulation was processed as in the preceding example to produce a chalky, friable acrylic base drawing stick.
The bending strength of th~ drawing and coloring ~ticks obtained in the foregoing examples was determined according to the method of 'JIS S-6005-1971. This strength- ; `
measuring method is conducted as follows~
A drawing and coloring element in the form of a ~ -blackboard-chalk-like stick having a square cross-section of 10 x 10 mm is laid with its centre between two supporting points. The concentrated minimum load that can break the stick is measured and the flexural strength is calculated by the following formula:
BPL
xd2 wherein f designates the bending strength (g/mm2), P stands for the minimum concentrated load (g) on the center that can break the load, L indicates the distance (mm) betw~en the two supporting points (usually adjusted to 60 mm), and d designates the cross-sectlonal dimension of the stick.
Tlle results are as set forth in the following Table Example bending s~rength . _. , . .
1 64.~
2 60.5 10 3 49.8 4 52.3 58.2 :
According to a variant, the powdered raw materials may be premixed and passed directly to a press for conversion to painting and drawing sticks in the form of school chalk ~-sticks, using the same pressure of about 90 kp/cm2.
' -",, .~ _ g _
According to a variant, the powdered raw materials may be premixed and passed directly to a press for conversion to painting and drawing sticks in the form of school chalk ~-sticks, using the same pressure of about 90 kp/cm2.
' -",, .~ _ g _
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A blackboard-chalk type drawing and painting stick for producing images adapted to be fixed by the use of heat, said stick being formed of a finely powdered mixture of colouring matter including at least one pigment and a bonding agent consisting of a composition containing at least one thermoplastic or heat-curable synthetic resin, said composition being capable of melting and/or curing under the influence of heat to form a vehicle for said colouring matter, the powdered mixture being pressure bonded, at a temperature below the melting or curing temperature of the resin composition, to form a rigid stick containing at least five percent by weight of pigment and a major proportion of synthetic resin composition.
2. A drawing and painting stick according to Claim 1, wherein the synthetic resin composition is a mixture of an epoxy resin and a polyester resin in a weight ratio of between 0.05:1 and 1.5:1.
3. A drawing and painting stick according to Claim 2, wherein the weight ratio of the epoxy and polyester resins is 1:1.
4. A drawing and painting stick according to Claim 1, wherein the colouring matter includes at least one dyestuff soluble in the synthetic resin composition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT711676A AT351129B (en) | 1976-09-24 | 1976-09-24 | METHOD OF PRODUCING A SCHOOL CHALK-SHAPED DRAWING AND PAINTING BODY FOR THE GENERATION OF IMAGES FIXABLE BY THE APPLICATION OF HEAT |
| AT7116/76 | 1976-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1098234A true CA1098234A (en) | 1981-03-24 |
Family
ID=3592866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA287,240A Expired CA1098234A (en) | 1976-09-24 | 1977-09-22 | Drawing and painting element in the form of school chalk for producing images adapted to be fixed by the use of heat |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5363132A (en) |
| AT (1) | AT351129B (en) |
| CA (1) | CA1098234A (en) |
| CH (1) | CH631114A5 (en) |
| DE (1) | DE2742928C2 (en) |
| ES (1) | ES462572A1 (en) |
| FR (1) | FR2365615A1 (en) |
| GB (1) | GB1556133A (en) |
| IT (1) | IT1086490B (en) |
| NL (1) | NL170300C (en) |
| SE (1) | SE433750B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1013384A (en) * | 1949-03-02 | 1952-07-28 | Du Pont | Excipient for glass dyes |
| FR1574122A (en) * | 1968-04-29 | 1969-07-11 | ||
| DE1908775A1 (en) * | 1969-02-21 | 1970-09-10 | Sueddeutsches Specksteinwerk H | Steatite chalk for marking hot metals |
| JPS5035860B2 (en) * | 1971-11-13 | 1975-11-19 | ||
| CH571563A5 (en) * | 1973-04-25 | 1976-01-15 | Teijin Ltd | Pencil lead - endless lengths extrudable from mixt contg epoxy resin as binder |
-
1976
- 1976-09-24 AT AT711676A patent/AT351129B/en not_active IP Right Cessation
-
1977
- 1977-09-15 SE SE7710324A patent/SE433750B/en not_active IP Right Cessation
- 1977-09-20 CH CH1149077A patent/CH631114A5/en not_active IP Right Cessation
- 1977-09-20 IT IT2773677A patent/IT1086490B/en active
- 1977-09-21 NL NL7710342A patent/NL170300C/en not_active IP Right Cessation
- 1977-09-22 CA CA287,240A patent/CA1098234A/en not_active Expired
- 1977-09-23 FR FR7728771A patent/FR2365615A1/en active Granted
- 1977-09-23 ES ES462572A patent/ES462572A1/en not_active Expired
- 1977-09-23 DE DE19772742928 patent/DE2742928C2/en not_active Expired
- 1977-09-24 JP JP11395877A patent/JPS5363132A/en active Granted
- 1977-09-26 GB GB4002877A patent/GB1556133A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH631114A5 (en) | 1982-07-30 |
| SE7710324L (en) | 1978-03-25 |
| DE2742928C2 (en) | 1983-11-17 |
| FR2365615B1 (en) | 1980-04-25 |
| NL170300C (en) | 1982-10-18 |
| AT351129B (en) | 1979-07-10 |
| ATA711676A (en) | 1978-12-15 |
| GB1556133A (en) | 1979-11-21 |
| ES462572A1 (en) | 1978-12-01 |
| FR2365615A1 (en) | 1978-04-21 |
| NL170300B (en) | 1982-05-17 |
| DE2742928A1 (en) | 1978-03-30 |
| SE433750B (en) | 1984-06-12 |
| NL7710342A (en) | 1978-03-29 |
| JPS5363132A (en) | 1978-06-06 |
| IT1086490B (en) | 1985-05-28 |
| JPS555786B2 (en) | 1980-02-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |