CA2051036A1 - Light-reflecting body - Google Patents
Light-reflecting bodyInfo
- Publication number
- CA2051036A1 CA2051036A1 CA002051036A CA2051036A CA2051036A1 CA 2051036 A1 CA2051036 A1 CA 2051036A1 CA 002051036 A CA002051036 A CA 002051036A CA 2051036 A CA2051036 A CA 2051036A CA 2051036 A1 CA2051036 A1 CA 2051036A1
- Authority
- CA
- Canada
- Prior art keywords
- light
- reflecting body
- weight
- housing
- polyphenylene sulfide
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Optical Elements Other Than Lenses (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Light-reflecting body Abstract of the Disclosure A light-reflecting body, the housing of which consists of a polyphenylene sulfide containing finely particulate kaolin and hydrotalcite, to at least one surface of said housing a reflecting metallic layer without an interlayer is applied.
Description
`- 20~1036 Li~ht-reflectino body The present invention relates to a light-reflecting body such as a headlamp or re~lector, the llollsing of which consists of a polyphenyl sulfide comprising finely particulate kaolin and hydrotalcite, to at least one surface of which housing a light-reflecting metallic layer without interlayer is applied.
ReQectors whose moulded parts or housings consist of polyphenylene sulfide containing inorganic and optionally fibre-reinforcing fillers and a metallic layer applied thereto are disclosed in, inter alia, EP-A-87 145, EP-A-197 830, EP-A-328 965, EP-A 340 954,US patent 4 474 921 and US patent 4 794 026. It is also known that the mechanical properties and the temperature of deilection under load of these moulding compositions can be improved by the addition of reinforcing fillers to the polyphenylene sulfide. Given the contemplated high loadings, however, the surface quality of the injected moulded parts normally deteriorates such that a metallic layer, such as a layer of aluminium, applied by vapour deposition under vacuum, will appear rough. The application of a varnish interlayer to enhance the surface quality prior to the vapour deposition of a metallic layer is uneconomic.
Surprisingly, it has now been found that it is possible to obtain moulded parts with e~ccellent surfaces onto which metals can be applied direct by vapour deposition to provide a reflecting metallic layer by using finely particulate kaolin, even at nigh loadings, in polyphenylene sulfides in the standard injection moulding technique, i.e. in the single component technique. The further addition of hydrotalcite in relatively minor amounts also makes it possible to obtain light-reflecting metallic layers which are resistant to corrosion caused by heat and moisture.
Accordingly, the invention relates to a light-reflecting body, the housing of which consists of a polyphenylene sulfide containing finely particulate fillers~ to at least one surface of which housing a reflecting metallic layer is applied, said housing comprising (a) 70-30 % by weight of polyphenylene sulfide having a melt flow index of 50 to1000 g/10 minutes, 205~a36 (b) 30-70 % by weight of kaolin having an average par~icle size smaller than 10 llm, ~c) 0.1-3 % by weight of hydrotalci~e, and (d) 0-1 % of a processing auxiliary, the amount of which composition consisting of (a), (b), (c) and (d) is 100 % by weight, and the metallic layer is applied to the surface of said housing without an interlayer.
The housing of the light-reflecting body of this invention preferably comprises (a) 60-35 % of polyphenylene sulfide, (b) 40-65 % of kaolin, and (c) 0.5-2 % of hydrotcllcite.
Any linear polyphenylene sulfide (PPS) or any polyphenylene sulfide prepared by the curing process can be used for the purposes of the invention. The eligible polyphenylene sulfides consist entirely or substantially of p-polyphenylene units; but the polyphenylene sulfides may also contain up to about 10 mol % of o-polyphenylene units or other arylene sulfide units in which the arylene moiety is an alkyl-substituted phenylene group, a p,p'-diphenylenesulfone group, a p,p'-diphenylene ether group, a p,p'-diphenylenecarbonyl group, a biphenylene or naphthylene group.
The eligible polyphenylene sulfides preferably have a melt flow index (MFI) of 50 to 800 g/10 minutes. The melt flow index is known in the art as a measure of the melt viscosity of thermoplastics and hence also of the polyphenylene sulfides useful in the practice of this invention. According to DIN 53 735, the melt flow index is the amount of thcrmoplastic which is forced through a standardised nozzle in 10 minutes under the application of a fixed load. The lower the melt flow index, the higher the molecular weight of the thermoplastic. The indicated MFI values were determined at a temperature of 315C, a test load of 2.16 kg and a melt time of 5 minutes.
The PPS suitable for use in the practice of this invention is a polymer whose molecular weight can be increased by supplying sufficient energy, such as heat, preferably in the presence of oxygen, either by molecular chain lengthening or by crosslinking or by a combination of both. The aftertreatment by means of which the molecular weight of the polymer is increased, can be terrned curing process. The aftertreatment of the PPS is described in more detail in JMS-Rev. Macromol. Chem. Phys. C 29(1), 1989, page 97 et seq., on the basis of a number of processes.
20~1~36 The fillers (b) and (c) suitable for use in the practice of this invention, viz. kaolin and hydrotalcite, are known. Kaolins, hydrated aluminhlm silicales having a particle size smaller than 10 ~lm, are commercially available, for example those sold by Engelhard under the registered trademark ASP, Santinones or Translink. The pre~erred kaolins are calcined kaolins, more particularly those which are coated with a silane, such as y-aminopropyltrimethoxysilane. The panicle size of the kaolins can be determined in known manner by the laser light scattering method.
The hydrotalcite suitable for use in the practice of this invention has the general formula [Mgl ~Al~(OH)2]~+[A~nmH20]X~, wherein n is the charge at the anion A, m is the number of moles of water of hydration, x is less than 1, and magnesium can be replaced by calcium, zinc, copper, manganese, lithium or nickel, and aluminium can be replaced by chromium (+3) or iron, and A is preferably carbonate or phosphate.
It is preferred to use a hydrocalcite of formula Mg4 sAI2(OH)I3CO3 3.5 H2O.
The processing auxiliary (d) may be typically a lubricant or stabiliser. The preferred processing auxiliary is a polyethylene, more particularly a high-density polyethylene.
The light-reflecting body of this invention may be shaped as a parabolic, concave or planar reflector. A particularly preferred field of use is that of headlamps, especially for vehicles, which are comparable to conventional metal headlamps in respect of light reflectance, luminosity and life. The housing of the light-reflecting body may have a thicklless of 0.5 to 5 mm.
The light-reflecting body of this invention can be made by injection moulding techniques conventionally used in the art from moulding compositions which contain appropriate fillers and which may contain additional customary modifiers, such as pigments or mould release agents. The moulding temperatures may be may be in the range from c. 120-150C, and the cylinder temperatures from 300-340C.
After shaping the housing, the side of the light-reflecting body to be metallised is coated with a metallic layer by conventional techniques, typically by depositing aluminium, preferably under vacuum.
The light-reflecting body has smooth surfaces with uniform reflectance. A reflectometer
ReQectors whose moulded parts or housings consist of polyphenylene sulfide containing inorganic and optionally fibre-reinforcing fillers and a metallic layer applied thereto are disclosed in, inter alia, EP-A-87 145, EP-A-197 830, EP-A-328 965, EP-A 340 954,US patent 4 474 921 and US patent 4 794 026. It is also known that the mechanical properties and the temperature of deilection under load of these moulding compositions can be improved by the addition of reinforcing fillers to the polyphenylene sulfide. Given the contemplated high loadings, however, the surface quality of the injected moulded parts normally deteriorates such that a metallic layer, such as a layer of aluminium, applied by vapour deposition under vacuum, will appear rough. The application of a varnish interlayer to enhance the surface quality prior to the vapour deposition of a metallic layer is uneconomic.
Surprisingly, it has now been found that it is possible to obtain moulded parts with e~ccellent surfaces onto which metals can be applied direct by vapour deposition to provide a reflecting metallic layer by using finely particulate kaolin, even at nigh loadings, in polyphenylene sulfides in the standard injection moulding technique, i.e. in the single component technique. The further addition of hydrotalcite in relatively minor amounts also makes it possible to obtain light-reflecting metallic layers which are resistant to corrosion caused by heat and moisture.
Accordingly, the invention relates to a light-reflecting body, the housing of which consists of a polyphenylene sulfide containing finely particulate fillers~ to at least one surface of which housing a reflecting metallic layer is applied, said housing comprising (a) 70-30 % by weight of polyphenylene sulfide having a melt flow index of 50 to1000 g/10 minutes, 205~a36 (b) 30-70 % by weight of kaolin having an average par~icle size smaller than 10 llm, ~c) 0.1-3 % by weight of hydrotalci~e, and (d) 0-1 % of a processing auxiliary, the amount of which composition consisting of (a), (b), (c) and (d) is 100 % by weight, and the metallic layer is applied to the surface of said housing without an interlayer.
The housing of the light-reflecting body of this invention preferably comprises (a) 60-35 % of polyphenylene sulfide, (b) 40-65 % of kaolin, and (c) 0.5-2 % of hydrotcllcite.
Any linear polyphenylene sulfide (PPS) or any polyphenylene sulfide prepared by the curing process can be used for the purposes of the invention. The eligible polyphenylene sulfides consist entirely or substantially of p-polyphenylene units; but the polyphenylene sulfides may also contain up to about 10 mol % of o-polyphenylene units or other arylene sulfide units in which the arylene moiety is an alkyl-substituted phenylene group, a p,p'-diphenylenesulfone group, a p,p'-diphenylene ether group, a p,p'-diphenylenecarbonyl group, a biphenylene or naphthylene group.
The eligible polyphenylene sulfides preferably have a melt flow index (MFI) of 50 to 800 g/10 minutes. The melt flow index is known in the art as a measure of the melt viscosity of thermoplastics and hence also of the polyphenylene sulfides useful in the practice of this invention. According to DIN 53 735, the melt flow index is the amount of thcrmoplastic which is forced through a standardised nozzle in 10 minutes under the application of a fixed load. The lower the melt flow index, the higher the molecular weight of the thermoplastic. The indicated MFI values were determined at a temperature of 315C, a test load of 2.16 kg and a melt time of 5 minutes.
The PPS suitable for use in the practice of this invention is a polymer whose molecular weight can be increased by supplying sufficient energy, such as heat, preferably in the presence of oxygen, either by molecular chain lengthening or by crosslinking or by a combination of both. The aftertreatment by means of which the molecular weight of the polymer is increased, can be terrned curing process. The aftertreatment of the PPS is described in more detail in JMS-Rev. Macromol. Chem. Phys. C 29(1), 1989, page 97 et seq., on the basis of a number of processes.
20~1~36 The fillers (b) and (c) suitable for use in the practice of this invention, viz. kaolin and hydrotalcite, are known. Kaolins, hydrated aluminhlm silicales having a particle size smaller than 10 ~lm, are commercially available, for example those sold by Engelhard under the registered trademark ASP, Santinones or Translink. The pre~erred kaolins are calcined kaolins, more particularly those which are coated with a silane, such as y-aminopropyltrimethoxysilane. The panicle size of the kaolins can be determined in known manner by the laser light scattering method.
The hydrotalcite suitable for use in the practice of this invention has the general formula [Mgl ~Al~(OH)2]~+[A~nmH20]X~, wherein n is the charge at the anion A, m is the number of moles of water of hydration, x is less than 1, and magnesium can be replaced by calcium, zinc, copper, manganese, lithium or nickel, and aluminium can be replaced by chromium (+3) or iron, and A is preferably carbonate or phosphate.
It is preferred to use a hydrocalcite of formula Mg4 sAI2(OH)I3CO3 3.5 H2O.
The processing auxiliary (d) may be typically a lubricant or stabiliser. The preferred processing auxiliary is a polyethylene, more particularly a high-density polyethylene.
The light-reflecting body of this invention may be shaped as a parabolic, concave or planar reflector. A particularly preferred field of use is that of headlamps, especially for vehicles, which are comparable to conventional metal headlamps in respect of light reflectance, luminosity and life. The housing of the light-reflecting body may have a thicklless of 0.5 to 5 mm.
The light-reflecting body of this invention can be made by injection moulding techniques conventionally used in the art from moulding compositions which contain appropriate fillers and which may contain additional customary modifiers, such as pigments or mould release agents. The moulding temperatures may be may be in the range from c. 120-150C, and the cylinder temperatures from 300-340C.
After shaping the housing, the side of the light-reflecting body to be metallised is coated with a metallic layer by conventional techniques, typically by depositing aluminium, preferably under vacuum.
The light-reflecting body has smooth surfaces with uniform reflectance. A reflectometer
2~1036 supplied by Dr. Lange GmbH is used for making objec~ive ~gloss mcasuremcnts in accordance with D~N 67 530.
Example 1: Using a laboratory Ko-kneader with a screw diamcter of 46 mm,50 parts of polyphenylene sulfide (melt flow index (MFI) = 105 g/10 min; sold by the Phillips Petroleum Company) are mixed with ~.75 parts of calcined kaolin (average particle si~e = 4 llm; density = 2.~ g/cm3), 1 part of hydrotalcite of general formula Mg4 sAl2(OH)l3CO3-3.5 H2O and 0.25 part of polyethylene (MFI =30 g/10 min.;
density = 0.96 g/cm3), and the mixture is granulated at 320C. The granules are dried at 140C for 4 hours and then processed to injection moulded articles under the following conditions: cylinder temperature 320C, mould temperature 140C, cycle time 30 sec.
The mcchanical and physico-thermal properties are assessed by determining the flexural strength, tensile strength, elongation at break and temperature of deflection under load as well as the flexural modulus of the moulded articles.
Under the conditions described above, boards measuring lOOxlOOx2 mm are preparedwith a press-polished injection mould. The surface quality of these boards is assessed by determining the gloss according to DIN 67 530 and visually. ~;loss assessment is made with a reflectometer (supplied by Dr. Lange GmbH) under a radiation angle of 20 by computing a relative value (based on a reference standard) of the reflected light as measure of the surface quality. Increasing gloss values mean enhanced surface qualities.
tlexural strength (DIN 53452) [N/mm2] = 109 tensile strength (DIN 53455) [N/mm2] = 64 elongation at break (DIN 53455) [%] = 0.7 tlexural modulus (DIN 53457) [N/mm2] = 11500 temperature of deflection under load (ISO 75) process A [C] = 165 process B [C] > 260 gloss (DIN 67530) = 160 surface quality, visual = smooth Examples 2-4: In accordance with the procedure of Example 1, boards measuring lOOxlOOx2 mm are prepared from the compositions of Table 1. The polyphenylene sulfide resins having the indicated ME~I's are suitable for making moulded articles with smooth 20~103~
sllrfaccs for fur~hcr processing by metallising.
Table 1:
Composition Example 2 Example 3 Example 4 PPS (1) % by weight 45 PPS (2) % by weight 45 PPS ~3) % by weight 45 kaolin (4) % by weight 53.9 53.9 53.
hydrotalcite (5) % by weight 1 1 OP w~x (6) 0.1 0.1 0.1 .. . _ Properties gloss (DIN 67530) 142 158 171 surface quality, visual smooth smooth smooth (1) polyphenylene sulfide (linear resin, MFI = 53 g/10 min.; Phillips Petroleum Company) (2) polyphenylene sulfide (prepared by the "curing process" MFI = lOS g/10 min.;Phillips Petroleum Company)
Example 1: Using a laboratory Ko-kneader with a screw diamcter of 46 mm,50 parts of polyphenylene sulfide (melt flow index (MFI) = 105 g/10 min; sold by the Phillips Petroleum Company) are mixed with ~.75 parts of calcined kaolin (average particle si~e = 4 llm; density = 2.~ g/cm3), 1 part of hydrotalcite of general formula Mg4 sAl2(OH)l3CO3-3.5 H2O and 0.25 part of polyethylene (MFI =30 g/10 min.;
density = 0.96 g/cm3), and the mixture is granulated at 320C. The granules are dried at 140C for 4 hours and then processed to injection moulded articles under the following conditions: cylinder temperature 320C, mould temperature 140C, cycle time 30 sec.
The mcchanical and physico-thermal properties are assessed by determining the flexural strength, tensile strength, elongation at break and temperature of deflection under load as well as the flexural modulus of the moulded articles.
Under the conditions described above, boards measuring lOOxlOOx2 mm are preparedwith a press-polished injection mould. The surface quality of these boards is assessed by determining the gloss according to DIN 67 530 and visually. ~;loss assessment is made with a reflectometer (supplied by Dr. Lange GmbH) under a radiation angle of 20 by computing a relative value (based on a reference standard) of the reflected light as measure of the surface quality. Increasing gloss values mean enhanced surface qualities.
tlexural strength (DIN 53452) [N/mm2] = 109 tensile strength (DIN 53455) [N/mm2] = 64 elongation at break (DIN 53455) [%] = 0.7 tlexural modulus (DIN 53457) [N/mm2] = 11500 temperature of deflection under load (ISO 75) process A [C] = 165 process B [C] > 260 gloss (DIN 67530) = 160 surface quality, visual = smooth Examples 2-4: In accordance with the procedure of Example 1, boards measuring lOOxlOOx2 mm are prepared from the compositions of Table 1. The polyphenylene sulfide resins having the indicated ME~I's are suitable for making moulded articles with smooth 20~103~
sllrfaccs for fur~hcr processing by metallising.
Table 1:
Composition Example 2 Example 3 Example 4 PPS (1) % by weight 45 PPS (2) % by weight 45 PPS ~3) % by weight 45 kaolin (4) % by weight 53.9 53.9 53.
hydrotalcite (5) % by weight 1 1 OP w~x (6) 0.1 0.1 0.1 .. . _ Properties gloss (DIN 67530) 142 158 171 surface quality, visual smooth smooth smooth (1) polyphenylene sulfide (linear resin, MFI = 53 g/10 min.; Phillips Petroleum Company) (2) polyphenylene sulfide (prepared by the "curing process" MFI = lOS g/10 min.;Phillips Petroleum Company)
(3) polyphenylene sulfide (prepared by the "curing process" MFI = 670 g/10 min.;Phillips Petroleum Company) (~) calcined (average particle si~e 4 ,um, coated with 1 % by weight of ~-aminopropyltriMethoxysilane, based on the filler) ~S) general formula Mg4 sAI2(OH)13CO3-3.5 H2O
(6) partially saponified ester wax from montanic acids (ex Hoechst AG).
Examples S and 6: A layer of aluminium is applied by vapour deposition under vaccum to one side of boards measuring lOOxlOOx2 mm which are prepared from the compositions of Table 2 in the same manner as in the preceding Examples. The aluminised surface of the specimens of Examples 5 and 6 has a smooth high-gloss appearance. The aluminised reflecting surfaces withstand a heat test at 180C for 350 hours without damage and storage in a humid atmosphere of 9S % relative humidity and at high temperatllre of over 2~103~
100C.
Table 2:
. . ___ Composition Examplc 5 Example 6 ..__ .
PPS (a) % by weight 45 65 kaolin (b) % by weight 53.75 33.75 hydrocalcite (c) % by weight 1 polyethylene (d) 0.25 0.25 Properties surface quality, visual smooth smooth Corrosion test; Al layer not Al layer 95 ~0 rel. humidity corroded not corroded 90C, 350 hours . ..__ heat test: Al layer Al layer 180C, 350 hours lmdamaged undamaged (a) polyphenyl sulfide (MFI = 670 g/10 min.: Phillips Petroleum Company) (b) calcined (average particle size 4 ,um, coated with 1 % by weight of ~-aminopropyltrimethoxysilane, based on the filler) (c) general formula Mg4 sAI2(OH)I3CO3-3.5 H2O
(d) high density polyethylene (d = 0.96 g/cm3, MFI = 30 g/10 min., Phillips Petroleum Company) Examples 7 and 8: Using a Ko-kneader with a screw diameter of 46 mm, the compositions of Table 3 are compounded at 320C and then granulated. The granules are dried at 140C
for 4 hours and then injection moulded to boards measuring 100xlOOx2 mm under the following conditions:
cylinder temperature 320C
mould temperature 140C
cycle time 30 sec.
2~S~036 A layer of aluminium is deposited onto one side of the boards under vacuum. After deposition the surfaces have a high-gloss appearance. The aluminised layer withstands a heat test at 180C for 350 hours without damage and storage in a humid atmosphere of 95 % relative humidity and at 90C for more than 350 hours.
Table 3:
Composition Example 7 Example 8 ..
PPS (a) % by weight 45 45 kaolin (b) % by weight 51.75 54.25 hydrocalcite (c) % by weight 3 0.5 HDPE (d) 0.25 0.25 Properties surface quality, visual smooth smooth corrosion test; Al layer Al layer 95 % rel. humidity not corroded not corroded 90C, 350 hours heat test: Al layer Al layer 180C, 350 hours undamaged undamaged (a) polyphenyl sulfide ~MFI = 670 g/10 min.: Phillips Petroleum Company) (b) calcined kaolin,average particle size 4 ~,Im, coated with 1 % by weight of ~-aminopropyltrimethoxysilane, based on the ~1ller) (c) hydrotalcite Mg4 5AI2~OH)I3CO3-3.5 H2O
(d) high density polyethylene (d = 0.962 g/cm3, MFI = 30 g/10 min., Phillips Petroleum Company)
(6) partially saponified ester wax from montanic acids (ex Hoechst AG).
Examples S and 6: A layer of aluminium is applied by vapour deposition under vaccum to one side of boards measuring lOOxlOOx2 mm which are prepared from the compositions of Table 2 in the same manner as in the preceding Examples. The aluminised surface of the specimens of Examples 5 and 6 has a smooth high-gloss appearance. The aluminised reflecting surfaces withstand a heat test at 180C for 350 hours without damage and storage in a humid atmosphere of 9S % relative humidity and at high temperatllre of over 2~103~
100C.
Table 2:
. . ___ Composition Examplc 5 Example 6 ..__ .
PPS (a) % by weight 45 65 kaolin (b) % by weight 53.75 33.75 hydrocalcite (c) % by weight 1 polyethylene (d) 0.25 0.25 Properties surface quality, visual smooth smooth Corrosion test; Al layer not Al layer 95 ~0 rel. humidity corroded not corroded 90C, 350 hours . ..__ heat test: Al layer Al layer 180C, 350 hours lmdamaged undamaged (a) polyphenyl sulfide (MFI = 670 g/10 min.: Phillips Petroleum Company) (b) calcined (average particle size 4 ,um, coated with 1 % by weight of ~-aminopropyltrimethoxysilane, based on the filler) (c) general formula Mg4 sAI2(OH)I3CO3-3.5 H2O
(d) high density polyethylene (d = 0.96 g/cm3, MFI = 30 g/10 min., Phillips Petroleum Company) Examples 7 and 8: Using a Ko-kneader with a screw diameter of 46 mm, the compositions of Table 3 are compounded at 320C and then granulated. The granules are dried at 140C
for 4 hours and then injection moulded to boards measuring 100xlOOx2 mm under the following conditions:
cylinder temperature 320C
mould temperature 140C
cycle time 30 sec.
2~S~036 A layer of aluminium is deposited onto one side of the boards under vacuum. After deposition the surfaces have a high-gloss appearance. The aluminised layer withstands a heat test at 180C for 350 hours without damage and storage in a humid atmosphere of 95 % relative humidity and at 90C for more than 350 hours.
Table 3:
Composition Example 7 Example 8 ..
PPS (a) % by weight 45 45 kaolin (b) % by weight 51.75 54.25 hydrocalcite (c) % by weight 3 0.5 HDPE (d) 0.25 0.25 Properties surface quality, visual smooth smooth corrosion test; Al layer Al layer 95 % rel. humidity not corroded not corroded 90C, 350 hours heat test: Al layer Al layer 180C, 350 hours undamaged undamaged (a) polyphenyl sulfide ~MFI = 670 g/10 min.: Phillips Petroleum Company) (b) calcined kaolin,average particle size 4 ~,Im, coated with 1 % by weight of ~-aminopropyltrimethoxysilane, based on the ~1ller) (c) hydrotalcite Mg4 5AI2~OH)I3CO3-3.5 H2O
(d) high density polyethylene (d = 0.962 g/cm3, MFI = 30 g/10 min., Phillips Petroleum Company)
Claims (7)
1. A light-reflecting body, the housing of which consists of a polyphenylene sulfide containing finely particulate fillers, to at least one surface of said housing a reflecting metallic layer is applied, characterized that said housing comprises (a) 70-30 % by weight of polyphenylene sulfide having a melt flow index of 50 to1000 g/10 minutes, (b) 30-70 % by weight of kaolin having an average particle size smaller than 10 µm, (c) 0,1-3 % by weight of hydrotalcite, and (d) 0-1 % of a processing auxiliary, the amount of which composition consisting of (a), (b), (c) and (d) is 100 % by weight, and the metallic layer is applied to the surface of said housing without an interlayer.
2. A light-reflecting body according to claim 1, characterized that the housing comprises (a) 60-35 % of polyphenylene sulfide, (b) 40-65 % of kaolin, and (c) 0.5-2 % of hydrotalcite.
3. A light-reflecting body according to claim 1, wherein the polyphenylene sulfide has a Melt flow index of 50 to 800 g/10 minutes.
4. A light-reflecting body according to claim 1, which comprises calcined kaolin as kaolin (b).
5. A light-reflecting body according to claim 4, wherein the calcined kaolin is coated with a silane.
6. A light-reflecting body according to claim 1, wherein the hydrotalcite (c) is one of formula Mg4.5Al2(OH)13CO3?3.5 H2O.
7. A light-reflecting body according to claim 1, wherein the processing auxiliary (d) is a polyethylene, preferably a high-density polyethylene.
FO 7.3/STA/sf*/ga*
FO 7.3/STA/sf*/ga*
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH295190 | 1990-09-12 | ||
| CH2951/90-4 | 1990-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2051036A1 true CA2051036A1 (en) | 1992-03-13 |
Family
ID=4245316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002051036A Abandoned CA2051036A1 (en) | 1990-09-12 | 1991-09-10 | Light-reflecting body |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0475900A3 (en) |
| JP (1) | JPH04272168A (en) |
| CA (1) | CA2051036A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4441486C2 (en) * | 1994-11-22 | 1996-09-19 | Bosch Gmbh Robert | Headlight reflector for vehicles |
| US8865303B2 (en) | 2009-10-02 | 2014-10-21 | National Coatings Corporation | Highly reflective roofing system |
| WO2014028548A1 (en) * | 2012-08-15 | 2014-02-20 | Ticona Llc | Directly metallizable polyarylene sulfide composition |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4429004A (en) * | 1980-06-26 | 1984-01-31 | Ciba-Geigy Corporation | Light-reflecting body |
| US4529769A (en) * | 1983-12-06 | 1985-07-16 | Phillips Petroleum Company | Poly(arylene sulfide) composition, molding method and article of manufacture |
| US4544700A (en) * | 1984-04-16 | 1985-10-01 | Phillips Petroleum Company | Poly(arylene sulfide) composition containing an ethylene polymer |
| JPH0759665B2 (en) * | 1987-03-31 | 1995-06-28 | 呉羽化学工業株式会社 | Polyary lentithioether composition |
| DE3916443A1 (en) * | 1989-01-31 | 1990-08-02 | Vollmann Gmbh & Co Kg Otto | Plug-in socket made in one-piece with reflector - made of pref. polyphenylene sulphide, for halogen lamp |
-
1991
- 1991-09-03 EP EP19910810699 patent/EP0475900A3/en not_active Withdrawn
- 1991-09-10 CA CA002051036A patent/CA2051036A1/en not_active Abandoned
- 1991-09-12 JP JP3261193A patent/JPH04272168A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04272168A (en) | 1992-09-28 |
| EP0475900A3 (en) | 1992-11-25 |
| EP0475900A2 (en) | 1992-03-18 |
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| Date | Code | Title | Description |
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| FZDE | Dead |