Headlamp reflectors for automobile vehicles manufactured by injection molding according to the coinjection process using poly(alkylene terephthalate)

• US 4,617,618 A
• Filed: 03/02/1984
• Issued: 10/14/1986
• Est. Priority Date: 03/07/1983
• Status: Expired due to Fees

• Current Assignee: Chemische Werke Huls Aktiengesellschaft, Cibie Projecteurs
• Original Assignee: Chemische Werke Huls Aktiengesellschaft, Cibie Projecteurs
• Inventors: Jadamus, Hans, Bittscheidt, Josef, Baciu, Antoine
• Primary Examiner(s): Feinberg, Craig R.
• Assistant Examiner(s): Okonsky, David A.
• Application Number:
  US06/585,786
• Time in Patent Office: 956 Days
• Field of Search: 264/328.18, 362/296, 362/341, 362/347, 362/61
• US Class Current: 362/341
• CPC Class Codes: B29C 45/00 Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor injection blow-moulding B29C49/06
• CPC Class Codes: B29L 2011/0083 Reflectors
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: F21S 41/37 characterised by their material, surface treatment or coatings
• CPC Class Codes: F21V 7/22 characterised by materials, surface treatments or coatings, e.g. dichroic reflectors

Abstract

The invention relates to a headlamp reflector for an automobile vehicle manufactured by injection molding according to the coinjection process using poly(alkylene terephthalate) having a viscosity number (DIN 16,779) of between 60 and 180 cm³ /g. It is characterized by the fact that the core contains some 15 to 75% by weight of hematite, at least 75% of the hematite having a particle size less than 70 μm. Good mechanical strength and good behavior in respect of temperature.

Claims

1. Headlamp reflector for an automobile vehicle manufactured by injection molding by the process of coinjection of polyalkylene terephthalate with a viscosity number of between 60 and 180 cm³ /g, in which the core comprises from 15 to 75% by weight of hematite, at least 75% of the hematite having a particle size less than 70 μ

m.

2. Headlamp reflector for an automobile vehicle as claimed in claim 1, in which the skin comprises up to 30% by weight of TiO₂.

3. Headlamp reflector for an automobile vehicle as claimed in claim 1, in which the core comprises from 30 to 60% by weight of hematite.

4. Headlamp reflector for an automobile vehicle as claimed in claim 3, in which the skin comprises up to 30% by weight of TiO₂.