EP0800659A1 - Reflecteur, et procede et moyen permettant de le produire - Google Patents

Reflecteur, et procede et moyen permettant de le produire

Info

Publication number
EP0800659A1
EP0800659A1 EP96937225A EP96937225A EP0800659A1 EP 0800659 A1 EP0800659 A1 EP 0800659A1 EP 96937225 A EP96937225 A EP 96937225A EP 96937225 A EP96937225 A EP 96937225A EP 0800659 A1 EP0800659 A1 EP 0800659A1
Authority
EP
European Patent Office
Prior art keywords
blank
reflector
weight
molding
unsaturated polyester
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.)
Withdrawn
Application number
EP96937225A
Other languages
German (de)
English (en)
Inventor
Jose Poch Parramon
Roland Glagla
Dirk Schmidt
Maurizio Manlio Monticelli
Santo Lepore
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.)
Hexion Specialty Chemicals AG
Marelli Europe SpA
Original Assignee
Bakelite AG
Magneti Marelli SpA
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 Bakelite AG, Magneti Marelli SpA filed Critical Bakelite AG
Publication of EP0800659A1 publication Critical patent/EP0800659A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings

Definitions

  • the present invention relates to reflectors which consist of a blank made of plastic, on the surface parts of which are provided for the reflection of rays, a metal layer is applied.
  • the blanks ie the non-reflecting reflectors by injection molding or injection molding by BMC -Moulding compounds.
  • BMC molding compounds are plastic compounds made from unsaturated polyester resin, dissolved in styrene, hardener, additives and reinforcing fibers.
  • the blanks obtained do not have sufficient surface quality.
  • the surfaces have roughness depths of 0.2-0.5 ⁇ m. They are therefore treated with an additional paint treatment before the metal layer is applied. This achieves a roughness depth of ⁇ 0.1 ⁇ m.
  • EP-A 0 634 605 It is known from EP-A 0 634 605 to produce reflectors with a high surface quality by injection molding an epoxy resin molding composition which contains a quartz / kaolin mixture and wollastonite as preferred fillers. In addition to the fact that these molding compounds cause increased tool and machine wear due to the hard fillers, our own work has shown that such molding compounds shrink by about 0.7-1% when hardened. In addition, a surface roughness of only 0.1 ⁇ m is achieved.
  • the fibers of the BMC molding compositions are one of the main reasons for the poor surface quality of the products produced from them.
  • the fibers were considered necessary by experts in order to give the molded articles (blanks) produced from unsaturated polyesters sufficient strength. This is all the more true than it is it is obvious that the fillers used must be finely divided and therefore only have a slightly reinforcing effect.
  • molding compositions based on unsaturated polyester which are sufficient for the dimensional stability of reflectors.
  • These molding compounds are free of styrene. They are free-flowing polyester molding compositions which contain polyester resins, curing accelerators and fillers and additives. It has been found that such molding compositions, after shaping and curing, show an extremely low shrinkage of about 0.3-0.6% and a high surface quality with roughness depths of ⁇ 0.1, in particular ⁇ 0.06 ⁇ m, if the proportion of fillers is at least 50% by weight, the fillers have an average grain size of less than 10 ⁇ m, and if the molding composition additionally contains a thermoplastic material.
  • molding compositions are shaped and hardened in a manner known per se by injection molding or transfer molding processes, and blanks are formed with an average surface roughness of less than 0.1 ⁇ m, even 0.06 ⁇ m and less.
  • the application of a metal layer to the surface, which is intended to reflect, is carried out in a manner known per se, as is also the case with mirroring in accordance with the described prior art, but without intervening lacquer treatment of the blank, for example by directly evaporating aluminum onto the blank .
  • Binders in the molding compositions used according to the invention are preferably crystalline or amorphous unsaturated polyester resins or polyester resin mixtures Mixtures with 0-60% amorphous and 40-100% crystalline polyester resin, with a softening point between about 50-110 ° C. They are mixed condensates of bifunctional alcohols and bifunctional acids, it being possible for both the alcohol component and the acid component to be ethylenically unsaturated. A small amount (up to 8% by weight) of so-called crosslinking agents, such as allyl esters, can be added to the resins.
  • the preferred polyester resins are the resins known from DE-A 21 53 782, which by esterifying a mixture of 60-85 mol% of alpha, beta-unsaturated dicarboxylic acids and 40-15 mol% of one or more of the three isomeric phthalic acids dihydric alcohols or alcohol mixtures are produced. These polyesters are preferably used without additional polymerizing compounds, ie without additional crosslinking agents.
  • the molding compositions according to the invention further contain 1-15 wt .-% of a thermoplastic material such as polyethylene, polypropylene, polyvinyl alcohol or polyvinyl acetate powder.
  • a thermoplastic material such as polyethylene, polypropylene, polyvinyl alcohol or polyvinyl acetate powder.
  • Fillers used according to the invention are not fibers or fibrous or needle-shaped substances, but rather granular or amorphous fillers.
  • Examples are chalks, preferably precipitated or amorphous chalks, aluminum oxide hydrate, kaolin, carbon black, zinc sulfide, barium sulfate, dolomite, titanium dioxide or talc, provided that they have an average particle size of less than 10 ⁇ m.
  • Hardeners are conventional organic peroxides, as are also used in the curing of conventional BMC molding compositions. Further Auxiliaries are lubricants and release agents such as metal soaps or waxes. The following structure thus results for the molding compositions according to the invention:
  • the molding compositions are produced in a manner known per se by mixing the components, preferably in the melt flow process with subsequent granulation.
  • the free-flowing masses are plasticized, shaped and hardened at temperatures in the range of 140-200 ° C. within 50-120 s in a manner known per se and in conventional injection molding or injection molding devices.
  • the shrinkage that occurs during hardening is about 0.3-0.6% and thus allows a very dimensionally accurate production of even complicated structures.
  • the flexural strengths of the hardened masses, tested according to ISO 178, are in the range from 80-100 MPa.
  • the impact strengths, tested according to ISO 179/1 eU, are in the range of 4-6 kJ / m 2 and the notched impact strengths, tested according to ISO 179 // leU, are 1-2 kJ / m 2 .
  • the amorphous UP resin used is an amorphous, unsaturated polyester based on terephthalic acid, fumaric acid, ethylene glycol and neopentyl glycol (UP resin 9193 NO from DSM)
  • the crystalline UP resin used is a crystalline, unsaturated polyester based on terephthalic acid, fumaric acid, ethylene glycol and butanediol (Palatal (R) M 606-21Z from BASF).
  • a molding compound is produced by mixing the following components:
  • the free-flowing mass is plasticized and shaped into a reflector in a transfer molding device and hardened at 160 ° C.
  • the refector blank obtained has the following values: Shrinkage: 0.5% bending strength: 80 MPa Impact strength: 4.6 KJ / m 2 Notched impact strength: 1.3 KJ / m 2 The roughness depth is 0.05 ⁇ m.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Golf Clubs (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un réflecteur à base de résines polyester insaturées, dont la surface de l'ébauche présente une profondeur de rugosité inférieure à 0,5 mu m. Ce réflecteur est obtenu par moulage par injection d'une matière de moulage à base de résines polyester insaturées, puis par application d'une couche de métal à effet réfléchissant sur la surface de l'ébauche. La matière de moulage polyester est exempte de fibres et de styrène.
EP96937225A 1995-11-01 1996-10-25 Reflecteur, et procede et moyen permettant de le produire Withdrawn EP0800659A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19540687 1995-11-01
DE19540687A DE19540687A1 (de) 1995-11-01 1995-11-01 Reflektor sowie Verfahren und Mittel zu seiner Herstellung
PCT/EP1996/004633 WO1997016752A1 (fr) 1995-11-01 1996-10-25 Reflecteur, et procede et moyen permettant de le produire

Publications (1)

Publication Number Publication Date
EP0800659A1 true EP0800659A1 (fr) 1997-10-15

Family

ID=7776350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96937225A Withdrawn EP0800659A1 (fr) 1995-11-01 1996-10-25 Reflecteur, et procede et moyen permettant de le produire

Country Status (10)

Country Link
US (1) US5760159A (fr)
EP (1) EP0800659A1 (fr)
JP (1) JPH11502038A (fr)
KR (1) KR980701094A (fr)
CN (1) CN1172535A (fr)
BR (1) BR9606963A (fr)
DE (1) DE19540687A1 (fr)
PL (1) PL322022A1 (fr)
TR (1) TR199700552T1 (fr)
WO (1) WO1997016752A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080252862A1 (en) * 2004-11-02 2008-10-16 Kyocera Chemical Corporation Light Reflector, Method for Manufacturing the Same and Projector
JP2006171059A (ja) * 2004-12-13 2006-06-29 Kiyousera Opt Kk 光反射鏡、その製造方法およびプロジェクター
JP5180454B2 (ja) 2006-09-13 2013-04-10 株式会社小糸製作所 車両用灯具及びその製造方法
KR101242725B1 (ko) 2010-11-23 2013-03-12 (주)네오빛 광반사용 열경화성 수지 조성물
KR102012306B1 (ko) 2012-06-04 2019-08-20 니혼 유피카 가부시키가이샤 Led 반사판용 결정성 불포화 폴리에스테르 수지 조성물, 상기 조성물로 이루어지는 입상물, 및 상기 입상물을 성형하여 이루어지는 led 반사판, 표면 실장형 발광 장치, 및 상기 발광 장치를 구비한, 조명 장치 및 화상 표시 장치
JP6099838B1 (ja) * 2015-05-28 2017-03-22 フドー株式会社 光反射体材料、光反射体、及び照明器具

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2965402D1 (en) * 1978-12-12 1983-09-01 Lucas Ind Plc Metallised moulded articles and method of producing them
JPS55161621A (en) * 1979-06-04 1980-12-16 Sumitomo Bakelite Co Ltd Manufacture of concave mirror
FR2660664A1 (fr) * 1990-04-05 1991-10-11 Norsolor Sa Nouvelles compositions a base de resines polyesters insaturees convenant pour la fabrication de reflecteurs de phares.
US5246983A (en) * 1990-06-27 1993-09-21 Takeda Chemical Industries, Ltd. Unsaturated polyester resin compositions, molding compounds and molded products therefrom
FR2678861B1 (fr) * 1991-07-10 1993-09-24 Valeo Vision Reflecteur en matiere plastique thermodurcissable, plus particulierement pour projecteur de vehicule automobile.
FR2707207B1 (fr) * 1993-07-09 1995-08-18 Valeo Vision Réflecteur en matière plastique, plus particulièrement destiné à un dispositif d'éclairage ou de signalisation de véhicule.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9716752A1 *

Also Published As

Publication number Publication date
JPH11502038A (ja) 1999-02-16
WO1997016752A1 (fr) 1997-05-09
PL322022A1 (en) 1998-01-05
DE19540687A1 (de) 1997-05-07
US5760159A (en) 1998-06-02
TR199700552T1 (xx) 1997-10-21
BR9606963A (pt) 1997-11-04
CN1172535A (zh) 1998-02-04
KR980701094A (ko) 1998-04-30

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