WO1990009245A1 - Procede de marquage d'un objet - Google Patents

Procede de marquage d'un objet Download PDF

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Publication number
WO1990009245A1
WO1990009245A1 PCT/GB1990/000233 GB9000233W WO9009245A1 WO 1990009245 A1 WO1990009245 A1 WO 1990009245A1 GB 9000233 W GB9000233 W GB 9000233W WO 9009245 A1 WO9009245 A1 WO 9009245A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating material
diluent
coating
indicia
label
Prior art date
Application number
PCT/GB1990/000233
Other languages
English (en)
Inventor
Reginald Lonergan
Original Assignee
Raychem Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Raychem Limited filed Critical Raychem Limited
Publication of WO1990009245A1 publication Critical patent/WO1990009245A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps

Definitions

  • This invention relates to marking objects with indelible markers-
  • markers There is often a need for providing objects with markers. For example components such as wires and cables i n wiring assemblies need to be identified, and other objects such as machinery, repair or emergency equipment and buildings often need to display required information.
  • One assembly that has been proposed for marking such equipment is described in European patent application No. 237258 (corresponding to U.S. application No. 157,073, the disclosure of which is incorporated herein by reference).
  • This marker assembly is very versatile to use and enables complex markers to be made relatively simply with modern word- processing equipment.
  • the markers can be cured so that they are substantially indelible once installed, that is to say, it is relatively difficult, and in many cases impossible, to remove indicia applied to the marker by wiping with common solvents.
  • the fact that the markers have a tough, solvent- resistant surface has meant that is has not been possible to make any alterations to a marker once it has been installed, that is to say, to make any alterations to the marker that will also be resistant to abrasion and/or solvents to a similar degree as the original marker.
  • the invention provides a method of providing a polymeric surface with a marking, which comprises:
  • the coating composition comprising a curable coating material and a diluent
  • the polymeric surface may, for example, be thermoplastic, by which is meant that it is formed from a thermoplastic rather than a thermosetting polymer although it may for example be cross-linked. Also the polymer should be coating-receptive.
  • thermoplastic polyesters such as polybutylene terephthalate, polyether polyesters such as polybutylene- oxide polybutylene terephthalate block copolyers, pOlyolefins e.g.
  • low, medium or high density polyethylene low, medium or high density polyethylene, ⁇ t ' ⁇ ylene vinyl acetate copolymers, ethylene-acrylic elastomers and certain fluorocarbons such as polyvii ylidine fluoride, but is preferably not used in conjunction with surfaces comprising polyvinyl chloride, certain silicone elastomers or polytetrafluoroethylene.
  • the present invention provides a method of forming a permanent alteration to a label that bears visible indicia, which comprises:
  • the coating composition comprising ' a curable coating material and a diluent
  • the surface may comprise a thermoset.
  • the label may originally have been provided with data such as servicing or inspection dates and the like, which need to be obliterated at intervaxs e.g. on completion of a service or inspection.
  • the coating material is simply applied to the relevant part(s) of the label and the coated label is heated, preferably by a hot-air gun or an infrared lamp, both to remove the diluent and to cure the coating material, steps (ii) and (iii) being performed as a single operation.
  • indicia may be formed on the coated area(s) of the label after the label has been heated to drive off the diluent of the coating material but before the coating material has cured. It will be appreciated of course that with many forms of coating material the diluent will not necessarily have been completely removed under step (ii) before the coating material begins to cure under step (iii).
  • the indicia that a s applied to the label may be applied in any appropriate form. Thus, for example, they may be applied in manuscript or they may be formed by a stamping or printing operation.
  • the coating material may be employed to obscure underlying symbols of the marker it is, of course, not inevitable that this will be the case, and in many instances the coating material may be applied to the blank area of the label in order to provide a surface upon which indelible indicia may be placed. Indeed, it is not even necessary in some instances for the coating material to be deposited on a label that bears indicia: it is possible for the coating material to be applied manually directly to a surface to be marked, either as a coating upon which indicia can be placed, or even in the form of indicia itself. In the latter case the coating material may be applied by brushing or by a stamping operation in which the material may be employed in the manner of a printing ink.
  • the coating material should be porous in order to be receptive to any ink that is used for the new indicia, and is preferably in particulate and/or filamentary form, and preferably is substantially insoluble in the diluent so that its original form is maintained.
  • the porous coating is substantially entirely in particulate form, in which case the particles preferably have a weight average particle size of not more than 100 micrometres, more preferably not more than 50 micrometres and especially not more than 25 micrometres, the preferred coatings having a particle size less than 10 micrometres. It has been found that coatings having particle sizes substantially greater than 100 micrometres may lead to surfaces that have unacceptable roughness either as cured or when written upon.
  • the coating material is preferably curable by reaction of a plurality of components that exist separately from one another in the form of filaments and/or particles.
  • One of the components preferably comprises an epoxy compound, especially a bisphenol A epoxy compound while the other component preferably comprises a compound having free amine groups, or a carboxylic acid, phenolic resin isocyanate or polyester curing agent.
  • the use of a particulate and/or filamentary coating not only improves the ink receptivity of the coating, but also enables coatings to be formed that are heat-curable but that also have a high degree of latency.
  • coatings may be formed that will readily cure within a relatively short length of time when heated, but the coating composition can be kept for months or even years at ambient temperatures with substantially no premature curing.
  • Such a high degree of latency may be achieved by processing the reactive components of the coating into separate particles and mixing the particles together to form the coating material.
  • the components will exist separately from each other until they are heated, whereupon they will fuse together and react.
  • the reactive components may be melt blended together before comminution.
  • the curing agent is not polymeric, for example an organic peroxide or other free radical initiator, it may be desirable for it to be blended with a polymeric material, e.g. a polyester or a reactive or "unreactive po ya ⁇ -ide before comminution.
  • the curable resin may instead, comprise a polyamide having free amine groups, in which case the curing agent preferably comprises a material having free or blocked isocyanate functional groups, e.g. a cresyl blocked isocyanate.
  • Other curing systems that may be mentioned are unsaturated polyesters or polyurethanes that are cured by a blocked isocyanate curing agent, and polyesters that are cured by a polyepoxide.
  • Polyamides that may be used for forming one of the components are those that are conventionally used as hot-melt adhesives. These polyamides are characterized by the fact that their amide linkages are separated by an average of at least fifteen carbon atoms and have amorphous structures in contrast with the more highly crystalline, fibre forming polyamides such as nylon 6 or nylon 6.6.
  • the polyamides preferably have an amine number of at least 5, the upper limit for the amine number being determined by the fact that as the amine number increases the polyamides become liquid at lower temperatures.
  • Such polyamides have the advantage that they may also be used to improve the flexibility of the cured coating.
  • the or at least one material having reactive amine groups is one based on a polymer that is the same as or similar to that on which the epoxy resin is based.
  • the or at least one material containing reactive amine groups is an adduct of the epoxy resin that is used with a compound containing reactive amine groups, preferably with an aliphatic diamine or triamine and especially with ethylene diamine cr ethylene triamine.
  • the use of an epoxy-amine compound adduct as the other reactive component or one of the other reactive components can significantly improve the cure rate of the adhesive in relation to its storage life, thereby permitting the storage life of the adhesive or the cured properties thereof to be improved.
  • Chemical curing accelerators may also be present in the coating, either blended with one of the reactive components or as separate particles.
  • Examples of accelerators include dimethylaminopyridine, tris (dimethylaminomethyl) phenol, tin octoate, imidazole or imidazole derivatives such as salts, substituted imidazoles or metal complexes thereof.
  • the coating material may contain other materials.
  • the coating material preferably contains a binder in order to improve the physical cohesion of the coating after drying.
  • the binder may comprise a polymer that is soluble in the diluent, for example a polyalkylene oxide, and especially a polyethylene oxide if the diluent comprises water, or it may comprise a polymer latex for example as described in European patent application No. 281,354 (corresponding ' to U.S. application No. 162,526 the disclosure of which is incorporated herein by reference).
  • binder employed will depend on the type of binder used, but will normally be at least 2%, more preferably at least 4% by weight but normally not more than 15%, preferably not more than 10% by weight in the case of binders that are soluble in the diluent. In the case of latex binders quantities in the range of from 20 to 50 by weight are normally employed.
  • Another material that is preferably included in the coating material is a pigment.
  • the pigment acts as an opacifying agent that obscures the underlying design and information on the label.
  • the coating material preferably contains at least 12% and especially at least 15% by weight pigment but preferably not more than 25% by weight pigment. Too low a quantity of pigment will not give sufficient covering power of the coating material so that more than one coat of the material will be required before the underlying indicia are completely obscured while too high a quantity of pigment may affect the physical properties of the cured surface. Normally a pigment level of from 17% to 22% by weight is used.
  • the preferred diluent for the coating material is water.
  • the quantity of diluent used will depend on a number of factors including the method by which the coating material is intended to be applied, but compositions having a solids content in the range of from 10 to 50%, and especially from 20 to 40% by weight are preferred.
  • the composition may be applied to the surface of the label in a number of ways, usually manually, for example by means of a brush or stencil or by a pen-like applicator.
  • the composition may be stored, if desired, in a container that is specifically designed for application to the label surface, for example in a reservoir of an applicator or in a pot that includes a device for applying the composition and the invention accordingly provides.
  • Figure 1 shows the application of a layer of coating material to an existing label
  • Figure 2 shows the amendment of the label after coating
  • Figure 3 is a sectional view of one form of applicator.
  • a label 1 that has been cured to render it indelible may easily be altered in a permanent manner by applying a thin coating 2 of coating material by means of a brush 3 which is attached to the top of a bottle of the liquid.
  • a hot-air gun is directed to the label for a period of about 30 seconds in order to dry the coating without causing any substantial curing of the coating.
  • the coated label 1 as shown in figure 2 may be altered manually, for example by means of a ball-point pen.
  • the altered label is then heated for a longer period, for example for 2 to 5 minutes by means of a hot-air gun or a sma-i 1 gas torch, in order to cure the coating and render the alterations indelible.
  • a pen-like applicator that is suitable for the coating material is shown in figure 3.
  • the applicator comprises a cylindrical body 10 that acts as a reservoir for the coating material.
  • the body has a closed rear end 11 and a front end 12 that terminates in a small orifice 13 for egress of the coating material during application.
  • the orifice 13 is normally closed by means of a rod 14 that is slidable within the orifice from a position (as shown) in which it blocks the orifice to a more rearwardly position in which the orifice is open.
  • the rod 14 is supported in the body by a disc 15 the rearward * facing surface of which is slightly convex and the forward facing surface of which is slightly concave.
  • the rearwardmost end 16 of the rod 14 abuts a biassing member 17 which is attached to the cyclindrical body 1 and exerts a light forward force on the rod 14 to cause it to close the orifice 13 «
  • the applicator is held in the hand in the same position as a pen so that the forward part of the cylindrical body is gripped between the thumb and fingers. If a small compressive force is exerted on opposite sides of the body by the thumb and fingers, opposed wall sections of the body begin to collapse. The collapsing of the walls causes the disc 15 to bend, thereby forcing the rod 14 rearwardly against the bias of the biassing member 17 to open the orifice 13. The coating material will then flow out of the orifice 13 until the grip on the cylindrical body 10 is relaxed, whereupon the rod 14 moves forward under the action of the biassing member 17 to close the orifice 13.
  • a liquid coating composition was formulated having the following solids composition:
  • the coating composition components were dispersed in water to give a liquid composition having a solids content of about 47% by weight.
  • the composition could be brushed on a label (after agitation of the bulk liquid) and covered the underlying information in one coat.
  • the coated composition could be dried by means of a hot-air gun in about 30 seconds and was then capable of receiving written or printed indicia. After further exposure to the hot-air gun for 1 to 2 minutes the coating cured to produce correction that could withstand wiping by the solvents listed in EP 237,258.
  • Example 1 was repeated using the components listed in the table.
  • the compositions could be coated onto a polymeric substrate e.g. a cable jacket or a previously cured epoxy label, or a non-polymeric substrate e.g. a metal surface, and dried by means of a hot-air gun followed by further heating to cure the composition after provision of written indicia, as described in Example 1.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

Un procédé de marquage d'une surface polymère consiste i) à appliquer une composition de revêtement comprenant une matière de revêtement ainsi qu'un diluant, ii) à éliminer le diluant, et iii) à chauffer la surface ayant été revêtue afin de polymériser ladite matière de revêtement. On peut utiliser la matière pour tracer des signes sur la surface, ou pour former une modification permanente sur une étiquette portant des signes visibles.
PCT/GB1990/000233 1989-02-14 1990-02-13 Procede de marquage d'un objet WO1990009245A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898903309A GB8903309D0 (en) 1989-02-14 1989-02-14 Method of marking an object
GB8903309.6 1989-02-14

Publications (1)

Publication Number Publication Date
WO1990009245A1 true WO1990009245A1 (fr) 1990-08-23

Family

ID=10651660

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000233 WO1990009245A1 (fr) 1989-02-14 1990-02-13 Procede de marquage d'un objet

Country Status (3)

Country Link
AU (1) AU5097290A (fr)
GB (1) GB8903309D0 (fr)
WO (1) WO1990009245A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102869457A (zh) * 2010-06-14 2013-01-09 法国圣戈班玻璃厂 聚合物材料的流涂方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0237258A2 (fr) * 1986-03-04 1987-09-16 Raychem Limited Dispositif de marquage
EP0157478B1 (fr) * 1984-02-14 1988-04-27 Raychem Limited Composition adhésive
EP0281354A2 (fr) * 1987-03-02 1988-09-07 Raychem Limited Article revêtu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157478B1 (fr) * 1984-02-14 1988-04-27 Raychem Limited Composition adhésive
EP0237258A2 (fr) * 1986-03-04 1987-09-16 Raychem Limited Dispositif de marquage
EP0281354A2 (fr) * 1987-03-02 1988-09-07 Raychem Limited Article revêtu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102869457A (zh) * 2010-06-14 2013-01-09 法国圣戈班玻璃厂 聚合物材料的流涂方法

Also Published As

Publication number Publication date
GB8903309D0 (en) 1989-04-05
AU5097290A (en) 1990-09-05

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