Coating agent and its use

Abstract

A coating agent for pencils for writing, sketching or drawing or for cosmetic articles of all kinds, including at least one cellulose fraction, at least one binder, at least one plasticizer, and at least one adhesion promoter, wherein the adhesion promoter is designed as a silane having functional groups.

Claims

1. A pencil, comprising: a shaft made of extruded WPC (wood plastic compounds); and a coating on at least a portion of the shaft, wherein the coating includes a coating agent comprising: at least one cellulose fraction; at least one binder; at least one plasticizer; and at least one adhesion promoter; wherein the adhesion promoter is a silane having functional groups, wherein the silane is an organofunctional silane.

2. The pencil according to claim 1, wherein the silane is an epoxifunctional silane.

3. The pencil according to claim 1, wherein a content of the silane in the coating agent is 1 to 8% by weight.

4. The pencil agent according to claim 1, wherein the cellulose fraction includes nitrocellulose in the form of nitrocellulose chips with plasticizer fraction; as pelleted nitrocellulose; or in phlegmatized, moistened form, or combinations thereof.

5. The pencil according to claim 1, wherein the agent is composed essentially of TABLE-US-00004 cellulose fraction  8 to 22% by weight solvent 58 to 77% by weight co-binder  4 to 11% by weight binder  2 to 7% by weight plasticizer  3 to 9% by weight adhesion promoter  1 to 8% by weight colorant  0 to 8% by weight.

Description

FRAMEWORK EXAMPLE COATING AGENT

(1) TABLE-US-00001 Cellulose component  8 to 22% by weight Solvent 58 to 77% by weight Co-binder  4 to 11% by weight Binder  2 to 7% by weight Plasticizer  3 to 9% by weight Adhesion promoter  1 to 8% by weight Colorant  0 to 14% by weight

FORMULATION EXAMPLE 1: COLORLESS COATING AGENT

(2) TABLE-US-00002 Nitrocellulose chips with plasticizer fraction  13% by weight Ethyl acetate (solvent)  66% by weight Cellulose acetobutyrate (Co-BM) 8.5% by weight Polyamide resin (binder)   4% by weight Epoxidized soybean oil (plasticizer) 6.5% by weight Epoxy-functional sane (adhesion promoter)   2% by weight

FORMULATION EXAMPLE 2: WHITE COATING AGENT

(3) TABLE-US-00003 Nitrocellulose chips with plasticizer fraction   9% by weight Ethanol (solvent)  68% by weight Cellulose acetobutyrate 6.0% by weight Polyamide resin (binder)   3% by weight Epoxidized soybean oil (plasticizer)   5% by weight Epoxy-functional silane (adhesion promoter)   4% by weight Carbon black (colorant)   5% by weight

(4) The cellulose fraction is present in the solution according to the invention as nitrocellulose in the form of nitrocellulose chips with plasticizer fraction as peileted nitrocellulose and/or in phlegmatized, moistened form. Water, butanol, ethanol or isopropanol serve as a moistening agent.

(5) The content of the cellulose component in the coating agent is 8 to 22% by weight.

(6) For example, ketones, acetates and/or alcohols can be used as solvents. Examples which may be cited are ethyl acetate, butanol, isopropanol and/or ethanol. Here, the content of solvent in the agent is between 58 to 77% by weight.

(7) Binders can be present, exemplified as polyimide resin, ketone resin, acrylate resin and/or formaldehyde resin.

(8) In general, binders which are soluble in the respective solvents can be used. The binder is present in a content of binder 2 to 7% by weight in the coating agent.

(9) The co-binder added to the coating agent in an amount of 4 to 11% by weight has the task of adjusting the flexibility/brittleness of the coating agent and thus coatings produced therewith. Examples which may be cited are cellulose acetobutyrate, cellulose acetoproprionate, cellulose acetate and/or polyacrylates, such as styrene acrylate.

(10) Examples of plasticizers used in the binder are epoxidized soybean oil, alkonsulfonic add esters and/or polyol esters and are present in a content of 3 to 9% by weight.

(11) The colorants (f) can be present as a pigment preparation, organic color pigments and/or inorganic pigments. Examples of inorganic pigments which may be cited are carbon black and titanium dioxide. If colorants are used, they can be present up to a content of 14% by weight.

(12) The coating agent described above is used for surface coatings and immersion caps for writing, drawing or painting devices or for cosmetic products of all kinds.

(13) The devices, articles are available as extruded pencils based on WPC (wood plastic compounds) and/or plastic. Here, the at least one base polymer in WPC and/or plastic is formed as polypropylene (PP), polyethylene (PE), polyamide (PA), polyacrylate, polyurethane (PU), thermoplastic polymers (TPE) and/or polyvinyl chloride (PVC).

(14) The colored and/or colorless coating agent is usually applied according to conventional coating technology on the objects to be coated in one or more layers and dried. These methods have long been used in the coating of wood-cased pencils/shafts. These are the immersion and polishing methods.