US20140224659A1 - Plastic part with selective metallization and corresponding manufacturing process - Google Patents

Plastic part with selective metallization and corresponding manufacturing process Download PDF

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Publication number
US20140224659A1
US20140224659A1 US14/126,045 US201214126045A US2014224659A1 US 20140224659 A1 US20140224659 A1 US 20140224659A1 US 201214126045 A US201214126045 A US 201214126045A US 2014224659 A1 US2014224659 A1 US 2014224659A1
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United States
Prior art keywords
plastic part
plastic
metallization
plastic material
selective metallization
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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.)
Abandoned
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US14/126,045
Inventor
Olivier Renaud
Benoit Delande
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Comfort and Driving Assistance SAS
Original Assignee
Valeo Securite Habitacle SAS
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Assigned to VALEO SECURITE HABITACLE reassignment VALEO SECURITE HABITACLE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RENAUD, OLIVIER, DELANDE, BENOIT
Publication of US20140224659A1 publication Critical patent/US20140224659A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/54—Electroplating of non-metallic surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02—Electroplating of selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/54—Electroplating of non-metallic surfaces
    • C25D5/56—Electroplating of non-metallic surfaces of plastics
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer

Definitions

  • the present patent application relates to the field of plastic parts with selective metallization and more particularly to plastic parts with selective metallization in the field of the motor vehicle industry.
  • Plastic parts with selective metallization are generally composed of one or more metallized portions made from a plastic material and of one or more nonmetallized portions made from another plastic material.
  • the metallized plastic material used is generally acrylonitrile/butadiene/styrene (ABS) and the nonmetallized plastic material used is generally polycarbonate (PC). It is also common to use, as metallized plastic material, an acrylonitrile/butadiene/styrene (ABS) coupled with polycarbonate (PC) mixture.
  • ABS acrylonitrile/butadiene/styrene
  • PC polycarbonate
  • ABS or the ABS/PC mixture is easy to metallize by electroplating and PC has a good chemical resistance to the baths used during the process of metallization of the ABS or ABS/PC mixture.
  • PA polyamide
  • ABS for the metallized portions of the shell of the motor vehicle identifier
  • PC for the nonmetallized portions.
  • PC has an isostatic modulus of elasticity of the order of 2400 MPa and a strain at break of 68 MPa. PC is thus much less resistant to impacts and much more deformable than PA and does not meet the requirements of the manufacturers.
  • One of the aims of the invention is thus to at least partially overcome the disadvantages of the prior art and to provide a plastic part with selective metallization corresponding to elevated mechanical properties.
  • the present invention thus relates to a plastic part with selective metallization comprising at least one first nonmetallized portion made from a first plastic material and at least one second metallized portion made from a second plastic material, the first plastic material being a semiaromatic polyester mixed or not mixed with polycarbonate and the second plastic material being a polyamide.
  • the semiaromatic polyester is chosen from polyethylene terephthalate and polybutylene terephthalate.
  • the first plastic material is reinforced by the addition of filler of glass fiber or glass bead type.
  • the metallization metal used for the metallization of the plastic part is chromium or nickel.
  • said plastic part is a shell of a motor vehicle identifier.
  • the invention also relates to a process for the manufacture of a plastic part with selective metallization, comprising the following stages:
  • FIG. 1 representing a plastic part with selective metallization.
  • FIG. 1 shows a plastic part 1 with selective metallization comprising at least one first nonmetallized portion 7 and at least one second metallized portion 9 .
  • plastic part 1 illustrated by FIG. 1 is a motor vehicle identifier, more specifically a key comprising a key bit 3 , a plastic shell comprising a first nonmetallized portion 7 , a metallized part 9 and a push button 5 for controlling the key bit 3 .
  • the first nonmetallized portion 7 is made from a first plastic material, such as a semiaromatic polyester mixed or not mixed with polycarbonate, said semiaromatic polyester advantageously being chosen from polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), due to their mechanical properties and properties of resistance to chemical attacks.
  • a first plastic material such as a semiaromatic polyester mixed or not mixed with polycarbonate
  • said semiaromatic polyester advantageously being chosen from polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), due to their mechanical properties and properties of resistance to chemical attacks.
  • This first material can be enhanced by adding thereto fillers of glass fiber or glass bead type.
  • the second metallized portion 9 is made from a second plastic material, such as a polyamide (PA).
  • a second plastic material such as a polyamide (PA).
  • the metallization of the PA by electroplating requires the use of baths which are much less corrosive than for the metallization of ABS; thus, the first portions 7 made of semiaromatic polyester mixed or not mixed with polycarbonate have less risk of being attacked and damaged during the electroplating of the plastic part.
  • the present invention also relates to a process for the manufacture of a plastic part 1 with selective metallization, comprising the following stages:
  • At least one first nonmetallized portion 7 is made from a semiaromatic polyester mixed or not mixed with polycarbonate, advantageously chosen from PET or PBT.
  • the semiaromatic polyester mixed or not mixed with polycarbonate can also be reinforced by the addition of fillers of glass fiber or glass bead type.
  • At least one second metallized portion 9 is made of PA.
  • FIG. 1 there may very obviously be one or more portions 7 , 9 of each material on the same plastic part 1 , according to the requirements related to the use of the plastic part 1 , according to esthetic criteria or else according to the criteria defined by the client.
  • the different portions 7 , 9 can be produced separately and then assembled to form the plastic part 1 or certain portions 7 , 9 can be overmolded onto others or else produced simultaneously according to methods well known to a person skilled in the art, this being a function of the final plastic part 1 and of the result desired after metallization.
  • the plastic part 1 passes through different baths, making it possible to apply, by means of a direct electrical current, a metal deposition at the surface of the plastic part 1 on the second portion or portions 9 made of polyamide, the metal being initially in the form of cations in solution in a solvent.
  • the selective metallization is a deposition of chromium on the second portion or portions 9 made of polyamide.
  • the deposition of chromium is replaced by a deposition of nickel.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Chemically Coating (AREA)
  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The present invention relates to a plastic part (1) with selective metallization comprising at least one first non-metallized portion (7) made from a first plastic material that cannot be metallized by electroplating and at least one second metallized portion (9) made from a second metallizable plastic material, the first plastic material being a mixture of polycarbonate and of a semiaromatic polyester and the second plastic material being a polyamide.

Description

  • The present patent application relates to the field of plastic parts with selective metallization and more particularly to plastic parts with selective metallization in the field of the motor vehicle industry.
  • Plastic parts with selective metallization are generally composed of one or more metallized portions made from a plastic material and of one or more nonmetallized portions made from another plastic material.
  • For these plastic parts with selective metallization, the metallized plastic material used is generally acrylonitrile/butadiene/styrene (ABS) and the nonmetallized plastic material used is generally polycarbonate (PC). It is also common to use, as metallized plastic material, an acrylonitrile/butadiene/styrene (ABS) coupled with polycarbonate (PC) mixture.
  • It is advantageous to use these different materials as ABS or the ABS/PC mixture is easy to metallize by electroplating and PC has a good chemical resistance to the baths used during the process of metallization of the ABS or ABS/PC mixture.
  • Nevertheless, the mechanical properties of PC are sometimes insufficient to meet the mechanical requirements related to the use of certain parts but also the mechanical requirements laid down by the clients, in particular if the example is taken of a plastic shell of a motor vehicle identifier, for example a hands-free device or a key, in which an unfoldable insert mechanism is positioned.
  • In the latter case, it is advantageous to use a polyamide (PA) which has an isostatic modulus of elasticity of the order of 7500 MPa and a strain at break of 135 MPa. However, polyamide (PA) cannot be used in the context of selective metallization of the shell of the motor vehicle identifier as it is damaged by the baths used during the metallization process.
  • One solution would thus be to use ABS for the metallized portions of the shell of the motor vehicle identifier and PC for the nonmetallized portions. However, PC has an isostatic modulus of elasticity of the order of 2400 MPa and a strain at break of 68 MPa. PC is thus much less resistant to impacts and much more deformable than PA and does not meet the requirements of the manufacturers.
  • It is therefore inadvisable to use such material to produce a motor vehicle identifier shell having selective metallization if it is desired to retain the mechanical properties laid down by the manufacturers for plastic parts of this type.
  • One of the aims of the invention is thus to at least partially overcome the disadvantages of the prior art and to provide a plastic part with selective metallization corresponding to elevated mechanical properties.
  • The present invention thus relates to a plastic part with selective metallization comprising at least one first nonmetallized portion made from a first plastic material and at least one second metallized portion made from a second plastic material, the first plastic material being a semiaromatic polyester mixed or not mixed with polycarbonate and the second plastic material being a polyamide.
  • According to one aspect of the invention, the semiaromatic polyester is chosen from polyethylene terephthalate and polybutylene terephthalate.
  • According to another aspect of the invention, the first plastic material is reinforced by the addition of filler of glass fiber or glass bead type.
  • According to another aspect of the invention, the metallization metal used for the metallization of the plastic part is chromium or nickel.
  • According to another aspect of the invention, said plastic part is a shell of a motor vehicle identifier.
  • The invention also relates to a process for the manufacture of a plastic part with selective metallization, comprising the following stages:
      • providing a plastic part comprising at least one first portion made from a semiaromatic polyester mixed or not mixed with polycarbonate and at least one second portion made from a polyamide,
      • electroplating the part in order to obtain selective metallization of the first portion.
  • Other characteristics and advantages of the invention will become more clearly apparent on reading the following description, given by way of illustrative and nonlimiting example, and FIG. 1, representing a plastic part with selective metallization.
  • FIG. 1 shows a plastic part 1 with selective metallization comprising at least one first nonmetallized portion 7 and at least one second metallized portion 9.
    •
  • The example of plastic part 1 illustrated by FIG. 1 is a motor vehicle identifier, more specifically a key comprising a key bit 3, a plastic shell comprising a first nonmetallized portion 7, a metallized part 9 and a push button 5 for controlling the key bit 3.
  • The first nonmetallized portion 7 is made from a first plastic material, such as a semiaromatic polyester mixed or not mixed with polycarbonate, said semiaromatic polyester advantageously being chosen from polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), due to their mechanical properties and properties of resistance to chemical attacks.
  • The mechanical properties of this first material can be enhanced by adding thereto fillers of glass fiber or glass bead type.
  • It is thus possible to obtain, for example for a PC/PBT/glass fiber mixture, an isostatic modulus of elasticity of the order of 10 000 MPa and a strain at break of 130 MPa.
  • The second metallized portion 9 is made from a second plastic material, such as a polyamide (PA).
  • The metallization of the PA by electroplating requires the use of baths which are much less corrosive than for the metallization of ABS; thus, the first portions 7 made of semiaromatic polyester mixed or not mixed with polycarbonate have less risk of being attacked and damaged during the electroplating of the plastic part.
  • The present invention also relates to a process for the manufacture of a plastic part 1 with selective metallization, comprising the following stages:
      • providing a plastic part 1 comprising at least one first portion 7 made from a semiaromatic polyester mixed or not mixed with polycarbonate and at least one second portion 9 made from a polyamide,
      • the electroplating of the plastic part 1 in order to obtain selective metallization of the first portion or portions 7.
  • During the manufacture of the plastic part 1, at least one first nonmetallized portion 7 is made from a semiaromatic polyester mixed or not mixed with polycarbonate, advantageously chosen from PET or PBT. The semiaromatic polyester mixed or not mixed with polycarbonate can also be reinforced by the addition of fillers of glass fiber or glass bead type.
  • Still during the manufacture, at least one second metallized portion 9 is made of PA.
  • As shown by FIG. 1, there may very obviously be one or more portions 7, 9 of each material on the same plastic part 1, according to the requirements related to the use of the plastic part 1, according to esthetic criteria or else according to the criteria defined by the client.
  • The different portions 7, 9 can be produced separately and then assembled to form the plastic part 1 or certain portions 7, 9 can be overmolded onto others or else produced simultaneously according to methods well known to a person skilled in the art, this being a function of the final plastic part 1 and of the result desired after metallization.
  • During the electroplating, the plastic part 1 passes through different baths, making it possible to apply, by means of a direct electrical current, a metal deposition at the surface of the plastic part 1 on the second portion or portions 9 made of polyamide, the metal being initially in the form of cations in solution in a solvent.
  • Generally, out of concern for attractiveness and protection, the selective metallization is a deposition of chromium on the second portion or portions 9 made of polyamide. In another embodiment, the deposition of chromium is replaced by a deposition of nickel.
  • Thus, by virtue of the mechanical and chemical properties of these materials, it is possible to obtain a plastic part 1 with selective metallization itself having sufficient mechanical properties to be suitable, for example, for the preparation of a shell of a motor vehicle identifier.

Claims (9)

1. A plastic part with selective metallization comprising:
at least one first nonmetallized portion made from a first plastic material which cannot be metallized by electroplating; and
at least one second metallized portion made from a second metallizable plastic material,
wherein the first plastic material is a mixture of polycarbonate and a semiaromatic polyester and in that the second plastic material is a polyamide.
2. The plastic part as claimed in claim 1, wherein the semiaromatic polyester is chosen from polyethylene terephthalate and polybutylene terephthalate.
3. The plastic part as claimed in claim 1, wherein the first plastic material is reinforced by the addition of filler of glass fiber or glass bead type.
4. The plastic part as claimed in claim 1, wherein the metallization metal used for the metallization of the plastic part is chromium.
5. The plastic part as claimed in claim 1, wherein said plastic part is a shell of a motor vehicle identifier.
6. A process for the manufacture of a plastic part with selective metallization, comprising the following stages:
providing a plastic part comprising at least one first portion made from a mixture of polycarbonate and a semiaromatic polyester and at least one second portion made from a polyamide,
electroplating the plastic part in order to obtain selective metallization of the first portion.
7. The manufacturing process as claimed in claim 6, wherein the semiaromatic polyester is chosen from polyethylene terephthalate and polybutylene terephthalate.
8. The manufacturing process as claimed in claim 6, wherein the mixture of polycarbonate and a semiaromatic polyester is reinforced by the addition of filler of glass fiber or glass bead type.
9. The manufacturing process as claimed in claim 6, wherein the metal deposited during the metallization is chromium.
US14/126,045 2011-06-29 2012-06-29 Plastic part with selective metallization and corresponding manufacturing process Abandoned US20140224659A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR11/02021 2011-06-29
FR1102021A FR2977254B1 (en) 2011-06-29 2011-06-29 PLASTIC PIECE WITH SELECTIVE METALLIZATION AND METHOD FOR MANUFACTURING THE SAME
PCT/EP2012/062670 WO2013001053A1 (en) 2011-06-29 2012-06-29 Plastic part with selective metallization and corresponding manufacturing process

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PCT/EP2012/062670 A-371-Of-International WO2013001053A1 (en) 2011-06-29 2012-06-29 Plastic part with selective metallization and corresponding manufacturing process

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EP (1) EP2726542B1 (en)
JP (1) JP6310387B2 (en)
FR (1) FR2977254B1 (en)
WO (1) WO2013001053A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10737530B2 (en) * 2015-05-14 2020-08-11 Lacks Enterprises, Inc. Two-shot molding for selectively metalizing parts

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FR3028710B1 (en) * 2014-11-13 2019-05-31 Valeo Comfort And Driving Assistance METHOD OF MAKING A PICTOGRAM AND CONTROL BOX COMPRISING PICTOGRAMS
DE102021117567A1 (en) 2021-07-07 2023-01-12 Leibniz-Institut Für Polymerforschung Dresden E.V. Process for the selective coating of multi-component plastic composites and components made of selectively coated multi-component plastic composites

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US4758855A (en) * 1985-11-21 1988-07-19 Canon Kabushiki Kaisha Shaft holding structure for holding shaft in article of resinous material
US5935691A (en) * 1997-08-19 1999-08-10 Silitek Corporation Metal dual-color extruded plastic key
US7364649B2 (en) * 2001-07-16 2008-04-29 Polymatech Co., Ltd. Method of producing the keytop for pushbutton switch
US20040258924A1 (en) * 2003-06-18 2004-12-23 Armin Berger Composite systems for in-mold decoration

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10737530B2 (en) * 2015-05-14 2020-08-11 Lacks Enterprises, Inc. Two-shot molding for selectively metalizing parts

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EP2726542B1 (en) 2015-06-24
US20180274117A1 (en) 2018-09-27
EP2726542A1 (en) 2014-05-07
JP2014524977A (en) 2014-09-25
JP6310387B2 (en) 2018-04-11
FR2977254B1 (en) 2013-08-30
WO2013001053A1 (en) 2013-01-03
US10648098B2 (en) 2020-05-12
FR2977254A1 (en) 2013-01-04

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