# US 9,752,041 B2 · Solid tempera and method for manufacturing same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,752,041 B2
- Document ID: US9752041B2
- Status: Granted
- Kind: B2
- Application number: 14/892,022
- Filed: 2013-11-11
- Published: 2016-04-21
- Granted: 2017-09-05
- Earliest claimed: 2013-05-06
- Assignees: Grup 8, S.A.
- Applicants: Grup 8, S.A.
- Inventors: Enrique Gil Brugalla
- Web page: https://patentgrep.com/patent/US9752041B2

## CPC

- C09D 13/00: Pencil-leads; Crayon compositions; Chalk compositions
- B43K 19/16: Making non-propelling pencils (making slate-pencil writing-cores B28D)
- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 11/16: Writing inks
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2339/06: Homopolymers or copolymers of N-vinyl-pyrrolidones
- C08K 5/0041: {Optical brightening agents, organic pigments}
- C08K 5/0058: {Biocides; (macromolecular substances as carriers for biocide material A01N25/10)}
- C08K 5/053: Polyhydroxylic alcohols
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/47: Thiazoles
- 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B43K: IMPLEMENTS FOR WRITING OR DRAWING (containers, casings or accessories for cosmetic substances, e.g. shaving soap, lipstick, make-up A45D34/00, A45D40/00)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention relates to a solid tempera and to the method for manufacturing the same, which includes a dispersion of resin having a concentration value of 10% to 70%, sodium stearate having a concentration of 10% to 20%, glycerine having a concentration value of 4% to 20%, water having a concentration of 7% to 50%, a pigment having a concentration value of 5% to 15%, an anti-foaming agent having a concentration of 1% to 3%, and a biocide having a concentration of 0.10% to 0.4%, the above concentration values relating to the final product. The tempera of the invention is used for painting or drawing on a substrate such as paper, Bristol board, wood or cardboard, being applied directly to said substrates without having to add water.

## Claims

### Claim 1

A solid tempera, to be used for painting or drawing on paper, Bristol board, wood, cardboard, for direct application without the need to add water, wherein it comprises:
a resin with a concentration between 10% and 70% in weight of the final product, selected within the group formed by: polyvinyl pyrrolidone k80-k90, wherein k refers to the molecular weight of the polymer, polyvinylalcohol preferably with an hydrolysis degree/99 (such as 17/99-65/99), and a polyvinylacetal resin, and
sodium stearate with a concentration between 10% and 20%, glycerine with a concentration between 4% and 20%, water with a concentration between 7% and 50%, a pigment with a concentration between 5% and 15%, an anti-foaming agent with a concentration between 1% and 3%, and finally a biocide with a concentration between 0.10% and 0.40%, all of the concentrations being referred to the final product, and
wherein the final product comprises the components in an homogeneous mix of two microphases, thereby, in use, a microphone of resin sticks to the substrate depositing a gelatinous layer that absorbs the pigment of the other immediately adjacent microphone, thus creating a film covering with uniform color and high covering capacity, a relief, and a 3D effect.

### Claim 2 (depends on 1)

The solid tempera, according to claim 1, wherein the pigment may be an organic, inorganic or metallic pigment.

### Claim 3 (depends on 1)

The solid tempera, according to claim 1, wherein the anti-foaming agent is selected within the group consisting in silicone water dispersions.

### Claim 4 (depends on 1)

The solid tempera, according to claim 1, wherein the biocide is selected within the group comprising methyl or ethyl para-hydroxybenzoates (parabene).

### Claim 5 (depends on 1)

The solid tempera, according to claim 1, wherein the biocide is a combination of benzisothiazolone and phenoxyethanol.

### Claim 6 (depends on 1)

The solid tempera, according to claim 1, wherein it comprises polyvinylacetal with a concentration of 60%, glycerine with a concentration of 7%, sodium stearate with a concentration of 12%, water with a concentration of 10% and pigment with a concentration of 9%.

### Claim 7 (depends on 1)

A method for manufacturing solid tempera, according to claim 1, characterized by the following steps:
i—to provide a mix A comprising pigments, sodium stearate, glycerine and water;
ii—to provide a mix B comprising a concentrated solution of resin in water, wherein the resin is selected within the group formed by polyvinyl pyrrolidone, polyvinylalcohol, polyvinylacetal;
iii—to heat the two solutions A and B to a temperature comprised within 60-90° C.;
iv—to mix by simultaneous addition the solutions A and B obtained in the steps i and ii, within a mould or container, obtaining the final mix C, containing solution A with a concentration of (40-60%) and solution B also with a concentration of (40-60%);
v—solidification of the resulting mix C within the containers to form a dimensionally stable solid tempera, that under a low mechanical effort, has the capacity to easily disperse on a surface or substrate such as paper, Bristol board, wood or cardboard.

### Claim 8 (depends on 7)

The method, according to claim 7, wherein the mix of the solutions A and B in the mould or container is carried out within a period of time comprised between 0.5 seconds and 2 seconds, so that the resulting mixing velocity prevents the total homogenization of both solutions A and B which are mixed together and at the same time prevents the total homogenization of the sodium stearate within the final mix.

### Claim 9 (depends on 7)

The method, according to claim 7, wherein the solidification step of the mix is carried out during a period of time of 5 to 10 seconds, submitting the packaged mix C to a flow of cool air under a temperature comprised between −10° C. and −20° C., so that the solidifying prevents the total homogenization of both solutions A and B which are mixed.