CN114381109A

CN114381109A - Polycarbonate composition transparent to infrared light

Info

Publication number: CN114381109A
Application number: CN202011132227.3A
Authority: CN
Inventors: 李思均; E·L·L·布罗卡特; S·哈巴; T·M·艾根汇森
Original assignee: SABIC Global Technologies BV
Current assignee: SABIC Global Technologies BV
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2022-04-22

Abstract

The invention relates to a polycarbonate composition comprising a polycarbonate, an acid stabilizer and at least one anthraquinone-based colorant having at least one hydroxyl group, wherein the composition has a transmission of at least 80% in the infrared wavelength range of 760-1120nm, wherein the transmission is determined on injection molded plaques having a thickness of 2mm prepared by injection molding the composition at a maximum temperature of 320 ℃ and a residence time of 10 minutes. Preferably the composition has a transmission of at most 10% in the visible wavelength range of 380-740 nm.

Description

Polycarbonate composition transparent to infrared light

Technical Field

The present invention relates to a polycarbonate composition, in particular for panels having a relatively low transmission in the visible wavelength range and a high transmission in the infrared wavelength range. The invention further relates to a panel comprising or consisting of the polycarbonate composition and the use thereof.

Background

Polycarbonate panels having relatively low transmission in the visible wavelength range and high transmission in the infrared wavelength range are advantageously used in applications that require the use of sensors that operate based on infrared radiation and in which the sensors themselves cannot be observed by the human eye. For example, the sensor is located on one side of the panel facing the internal structure, while the other side of the panel is visible in normal use. By way of example, such panels may be used as (part of) a front panel of a vehicle, where the sensors and accompanying electronics are placed such that they cannot be viewed in normal use, thereby allowing the manufacture of a vehicle with the desired aesthetics combined with the prior art safety provisions provided by the sensors.

Polycarbonate compositions having low transmission in visible light are known per se and can be prepared, for example, by compounding polycarbonate with carbon black. Such compositions can be made at low cost and provide sufficiently low visible light transmission. Carbon black also absorbs infrared light, making the use of such compositions less suitable for the above applications.

Polycarbonate compositions having low transmission in the visible can also be made by using a combination of colorants that do not absorb infrared light or absorb infrared light to a lesser extent. Some of these, however, contain hydroxyl groups, which the present inventors have found to react with polycarbonate at high molding temperatures, thereby causing an undesirable change in the colorant and hence the light absorption properties of the polycarbonate composition.

WO2019/102349 discloses a panel for use on a vehicle comprising a first portion having a relatively high transmission in visible light and optionally a second portion having a relatively low transmission in visible light and being at least partially transmissive to infrared light, such that the infrared sensor can be hidden but infrared light is transmitted through the second portion.

US2015/368434 discloses colored molding compounds based on polycarbonate, and in particular this reference discloses polycarbonate compositions containing specific organic colorants having a high color stability against weathering due to the use of specific stabilizers based on phosphoric acid esters. US2015/368434 further discloses a polymer composition containing at least one thermoplastic, at least one organic colorant, preferably a combination of at least two organic colorants having a specific structure, and at least one phosphate-based stabilizer.

US2014/128526 discloses a method of making a polycarbonate composition comprising: reacting an aromatic dihydroxy compound and a diaryl carbonate in the presence of a catalyst to form a polycarbonate; and adding to the polycarbonate a polycarbonate having a thickness of less than or equal to 20mm as determined according to ASTM D445 at 25 ℃²A polydiorganosiloxane of kinematic viscosity per second and optionally additives to form a polycarbonate composition; wherein the polydiorganosiloxane has a phenyl content; and wherein a 3mm plaque of the polycarbonate composition has a haze of less than or equal to 1% as determined according to astm D1003-07, procedure a, illuminant CIE-D65.

US2013/116365 discloses a polycarbonate resin composition containing 100 parts by weight of a polycarbonate resin (A) and 0.1X 10^-4To 10.0X 10^-4A bluing agent in parts by weight, the polycarbonate resin (A) containing at least a structural unit derived from a dihydroxy compound having a moiety represented by the following formula (1) as part of its structure, characterized in that a molded object (thickness of 3 mm) formed from the polycarbonate resin composition has 1.5kW/m, as determined by transmission light inspection according to ASTM D1925-70, which has been subjected to a wavelength range of 300-400nm in an environment having a temperature of 63 ℃ and a relative humidity of 50%²A Yellowness Index (YI) value of 12 or less after 100 hours of irradiation treatment with the metal halide lamp.

-(CH₂-O)-

[ chemical formula 1]

[ excluding the moiety represented by the general formula (1) constituting-CH₂The case of-O-H.]

KR20170036252 discloses a polycarbonate thermoplastic resin composition, and more specifically a thermoplastic resin composition having excellent infrared transmittance and visible light shielding ratio. More specifically, this document discloses a polycarbonate resin composition comprising 90 to 99.89% by weight of a polycarbonate resin, 0.1 to 5% by weight of a metal salt of aromatic sulfone sulfonic acid; (UL-94 test) is V-0, visible light (wavelength in the range of 300nm or more and shorter than 700 nm) has a transmittance of 5% or less, and the thermoplastic resin composition has an infrared transmittance of 85% or more in the wavelength range of 700nm or more.

Disclosure of Invention

The inventors have discovered that the infrared absorption of certain colorants is affected by the conditions under which polycarbonate compositions containing such colorants are processed. In particular, it has been found that certain conditions lead to an unfavorable shift of the absorption spectrum of such colorants, which in turn reduces the transmission in the infrared wavelength range.

It is therefore an object of the present invention to provide a polycarbonate composition which is suitable for the production of panels having a high transmission in the infrared wavelength range.

It is another object of the present invention to provide a polycarbonate composition suitable for making a panel having a combination of low transmission in the visible wavelength range and high transmission in the infrared wavelength range.

More specifically, it is an object of the present invention to provide such polycarbonate compositions which can be processed in molding equipment under extreme conditions, such as high temperature and/or high residence time, into molded articles, such as image panels, wherein the influence of processing on optical properties in the visible and infrared wavelength range is minimized.

The present inventors have surprisingly found that when a polycarbonate composition comprising an anthraquinone-based colorant having one or more hydroxyl groups further comprises an acid stabilizer, the change in transmission properties upon molding of the polycarbonate composition is minimized.

The present invention therefore relates to a polycarbonate composition comprising a polycarbonate, an acid stabilizer and at least one anthraquinone-based colorant having at least one hydroxyl group, wherein the composition has a transmission of at least 80% in the infrared wavelength range of 760-1120nm, wherein the transmission is determined on injection-molded plaques having a thickness of 2mm prepared by injection-molding the composition at a maximum temperature of 320 ℃ and a residence time of 10 minutes.

More specifically, the present invention relates to a polycarbonate composition comprising an interfacial polycarbonate, an acid stabilizer, and at least one anthraquinone-based colorant having at least one hydroxyl group, wherein the composition has a transmittance of at least 80% in the infrared wavelength range of 760-1120nm, wherein the transmittance is measured on an injection molded plaque having a thickness of 2mm prepared by injection molding the composition at a maximum temperature of 320 ℃ and a residence time of 10 minutes, and wherein the acid stabilizer is a sulfonic acid or sulfonate ester, an organic phosphorus acid or ester thereof, or a combination comprising at least one of the foregoing.

The above objects are at least partly achieved when applying the present invention.

Detailed Description

Polycarbonate resin

The term "polycarbonate composition" as used herein is to be understood as a composition containing a polymeric polycarbonate as a major component. The invention is disclosed herein as being based on polycarbonate being the only polymeric material in the composition. But other polymers may be present in lesser amounts. Thus and for the avoidance of doubt, the amount of polycarbonate in the composition is at least 60 wt%, preferably at least 80 wt%, more preferably at least 90 wt%, more preferably at least 95 wt%, even more preferably at least 99 wt%, based on the total amount of polymeric material in the composition. Preferably, the polycarbonate composition consists essentially of polycarbonate as the polymeric material, and other polymeric materials are not present in the composition. It is therefore preferred that the polymeric material in the composition consists of polycarbonate, in particular interfacial polycarbonate. In embodiments where additional polymers are present in the composition, the additional polymers should be considered part of the polycarbonate.

Further polymers which may be present as minor components may be polybutylene terephthalate, polyethylene terephthalate and/or Acrylonitrile Butadiene Styrene (ABS) copolymers.

The polycarbonate in the polycarbonate composition may be a mixture of at least two polycarbonates, each of which may be a homopolymer or a copolymer. Specific examples of mixtures consist of bisphenol a polycarbonate homopolymer and polycarbonate-polysiloxane copolymer. Preferably the polycarbonate is a polycarbonate homopolymer obtained by reacting a bisphenol, such as bisphenol a, with a carbonate source, such as phosgene or a diaryl carbonate, such as diphenyl carbonate. Thus, the polycarbonates of the polycarbonate compositions according to the invention can be prepared using the so-called interfacial process, in which BPA is reacted with phosgene, or by means of the so-called melt or direct transesterification process, in which BPA is reacted with diphenyl carbonate. Both types of polycarbonates are known to those skilled in the art and may also be referred to herein as interfacial polycarbonates and melt polycarbonates. Those skilled in the art will appreciate that these two types of polycarbonates differ in the amount of Fries branching and the terminal hydroxyl content, with Fries branching being present only in the melt polycarbonate, and with interfacial polycarbonates generally having much lower terminal hydroxyl content.

Preferably, the polycarbonate is obtained via an interfacial process, since such processes typically provide polycarbonates with a small number of hydroxyl chain ends compared to melt processes. A small amount of hydroxyl chain ends is beneficial to the thermal stability and color retention of the polycarbonate. Nevertheless, the use of polycarbonates obtained via the melt process, i.e. melt polycarbonates, is not excluded in the present invention. In one embodiment, the polycarbonate is a mixture of at least one polycarbonate obtained via an interfacial process and at least one polycarbonate obtained using a melt process. In such embodiments, the amount of melt polycarbonate can be from 30 to 70 weight percent and the amount of interfacial polycarbonate is from 70 to 30 weight percent, based on the combined weight of the melt polycarbonate and the interfacial polycarbonate.

Preferably the polycarbonate comprises or consists of an interfacial polycarbonate. More preferably, the polycarbonate is an interfacial polycarbonate prepared by reacting bisphenol a and phosgene. Thus, it is preferred that the polycarbonate is a bisphenol A polycarbonate or a bisphenol A polycarbonate homopolymer.

The polycarbonate or the mixture of polycarbonates preferably has a thickness of 3 to 35cm, as determined according to ISO 1133(300 ℃, 1.2kg)³Melt Volume Rate (MVR) of 10 min. Preferably, the MVR is 6 to 25, more preferably 14-21cm³/10min。

The polycarbonate composition preferably has a thickness of 3 to 35cm, as determined according to ISO 1133(300 ℃, 1.2kg)³Melt volume rate of 10 min. Preferably, the MVR is 6 to 25, more preferably 14-21cm³/10min。

Acid stabilizers

The acid stabilizer is preferably a sulfonic acid or sulfonate ester, an organophosphorous acid or an ester thereof, or a combination comprising at least one of the foregoing, i.e., a combination comprising two or more of the foregoing. A preferred stabilizer is n-butyl tosylate (BuTos).

The sulfonate ester may comprise an organic sulfonic acid stabilizer having the formula:

wherein each R⁷Independently is C_1-30Alkyl radical, C_6-30Aryl radical, C_7-30Alkylarylene, C₇-₃₀Arylalkylene, or derived from C_2-32Polymer units of an ethylenically unsaturated aromatic sulfonic acid or ester thereof; and R is⁸Is hydrogen，C_1-24Alkyl, or formula-S (═ O)₂-R⁷In which R is⁷Is C_6-12Aryl or C_7-24An alkylarylene group. The sulfonic acid may include alkyl benzene sulfonic acid, polystyrene sulfonic acid, or p-toluene sulfonic anhydride. Preferably, the acid stabilizer is p-toluenesulfonic acid or butyl p-toluenesulfonate (i.e., n-butyl tosylate). The acid stabilizer is preferably applied in the polymer composition in an amount of 0.5ppm to 5ppm based on the total weight of the polymer composition.

The organic phosphorus-containing acid or ester thereof can include phosphorous acid, phosphoric acid, a phosphite, a phosphine, a phosphonite compound, or a combination comprising at least one of the foregoing. Without wishing to be limited thereto, the inventors believe that the sulfonic acid or ester thereof, the organophosphorous acid or ester thereof, or a combination comprising at least one of the foregoing, helps stabilize the anthraquinone-based colorant having at least one hydroxyl group. The present inventors postulate that the reaction between the colorant and the polycarbonate results in a shift in the absorption spectrum of the colorant and, therefore, a change in the transmission properties of the polycarbonate composition.

For the avoidance of doubt, it is noted that in the context of the present invention the term "acid stabiliser" means an acid or an ester of such an acid. Other acid-derived compounds, such as, for example, salts, are not considered acid stabilizers and are therefore excluded from the term "acid stabilizer". More specifically, the acid stabilizer is not an alkali or alkaline earth metal salt, such as an alkali or alkaline earth metal salt of a sulfonic acid or an organic phosphorus acid.

Coloring agent

The compositions disclosed herein contain at least one anthraquinone-based colorant having at least one hydroxyl group. The term "anthraquinone-based" means that the molecules that make up the colorant contain one or more anthraquinone moieties. Such colorants can react with the polycarbonate due to hydroxyl groups, particularly under more extreme, sometimes referred to as "harsh" processing conditions. Such conditions involve relatively high temperatures and relatively long residence times. The negative effect of this reaction may be a change in the absorption spectrum of the colorant, which in turn changes the overall absorption spectrum and hence the transmittance of the composition. Thus, the absorption of light in the infrared wavelength range may increase, which in turn may cause a malfunction or at least less reliable operation of an infrared sensor that needs to transmit and/or receive infrared light through a panel made from the composition.

Preferably, the anthraquinone-based colorant is a green colorant, more preferably solvent green 28, having a CAS registry 28198-05-2, 71839-01-5, or 4851-50-7.

To obtain the desired low visible light transmission, a combination of colorants is used, wherein at least one such colorant, preferably the green colorant, is an anthraquinone-based colorant having at least one hydroxyl group. It is therefore preferred that the anthraquinone-based colorant in the polycarbonate composition is a green colorant, and that the composition further comprises one or more of a red colorant, a blue colorant, a yellow colorant, and an orange colorant, preferably a red colorant and a blue colorant. The combination of red, blue and green colorants allows for the manufacture of compositions, including products molded therefrom, having a black appearance and having low visible light transmission. Yellow or orange colorants can be added to fine tune the final shade of the product. For the avoidance of doubt, it is noted that the compositions of the present invention may contain colorants which do not have an anthraquinone moiety.

The colorant is preferably an organic dye. The red dye is preferably one or more selected from the group consisting of solvent red 52, solvent red 111, solvent red 135, solvent red 169, solvent red 179, solvent red 207, disperse red 22, vat red 41.

The blue dye is preferably one or more selected from the group consisting of disperse blue 73, solvent blue 97, solvent blue 101, solvent blue 104, solvent blue 122, solvent blue 138. Optionally, solvent violet 13 may also be included in the compositions disclosed herein, and solvent violet 13 should be considered a blue colorant for the purposes of the present invention.

The yellow dye is preferably one or more selected from the group consisting of disperse yellow 201, solvent yellow 33, solvent yellow 114, solvent yellow 93, solvent yellow 98, solvent yellow 163, solvent yellow 160:1, solvent yellow 188.

The orange dye is preferably one or more selected from the group consisting of solvent orange 60, solvent orange 63, disperse orange 47.

The total amount of colorant is generally selected so as to obtain the desired color intensity. The total amount of colorant in the polymer composition may be from 0.1 to 1000ppm by weight.

The composition preferably does not contain inorganic pigments, since these may absorb too much infrared radiation. Organic pigments may be used in the compositions disclosed herein, provided that they do not significantly absorb light in the infrared wavelength range in the wavelength range of 760-1120 nm.

Composition comprising a metal oxide and a metal oxide

Preferably the composition is translucent or opaque as measured on an injection molded plaque having a thickness of 2mm prepared by injection molding the composition at a maximum temperature of 320 ℃ and a residence time of 10 minutes. Thus, it is preferred that the composition has a transmittance of at most 50% in the visible wavelength range of 380-740 nm.

For opaque compositions, the composition has a transmittance of at most 10% in the visible wavelength range of 380-740 nm.

The composition may have a transmission of 11 to 50%, such as 20-40%, in the visible wavelength range of 380-740 nm.

The composition may have a transmittance of 0 to 10%, such as 2-8%, in the visible wavelength range of 380-740 nm.

The transmission in visible light can be adjusted by means of the concentration and type of the used colorants as is well known. To achieve the transmission requirement in the wavelength range of 380-740nm, a combination of green, red and blue colorants is typically used, optionally with some additional colorants to modify the final hue. An overall black hue is generally desired.

In embodiments of the disclosed herein where the shading power dependence or significance of panels made from the compositions is low, the compositions may have a transmittance of 51 to 90%, such as 60-80%, in the visible light wavelength range of 380-740 nm.

The composition preferably has a thickness of 3 to 35cm, as determined according to ISO 1133(300 ℃, 1.2kg)³Melt volume rate of 10 min. Preferably, the MVR is 6 to 25, more preferably 14-21cm³/10min。

Preferably, the polycarbonate compositions disclosed herein comprise a red colorant, a blue colorant, and a green colorant, wherein at least the green colorant is an anthraquinone-based colorant having at least one hydroxyl group, wherein based on the weight of the composition:

the amount of red colorant is at most 0.5% by weight, preferably from 0.05 to 0.5% by weight

The amount of blue colorant is at most 0.5% by weight, preferably from 0.05 to 0.5% by weight

The amount of green colorant is at most 0.5% by weight, preferably from 0.05 to 0.5% by weight

The amount of acid stabilizer is up to 3ppm by weight, preferably from 0.1 to 3 ppm.

The polycarbonate compositions disclosed herein can comprise an anthraquinone-based green colorant having at least one hydroxyl group and optionally a red and/or blue colorant, wherein based on the weight of the composition:

-the amount of red colorant, if present, is at most 0.5% by weight, preferably from 0.01% to 0.5% by weight

-the amount of blue colorant, if present, is at most 0.5% by weight, preferably from 0.01% to 0.5% by weight

The amount of green colorant is at most 0.5% by weight, preferably from 0.01 to 0.5% by weight

The amount of acid stabilizer is up to 3ppm by weight, preferably from 0.1 to 3 ppm. Such compositions may be suitable for compositions that do not require low transmission in the visible wavelength range, or where only a specific wavelength range is required to have a certain transmission.

The compositions as disclosed herein may further comprise additives common in the art, such as mold release agents, antioxidants, UV stabilizers, flame retardants and fillers, provided that their amounts do not cause significant deterioration of infrared radiation in the wavelength range of 760-1120 nm. Preferably the composition of the invention does not contain a flame retardant. More specifically, it is preferable that the composition does not contain a metal salt of aromatic sulfonic acid. Even more particularly, it is preferred that the composition does not comprise sodium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3-sulfonate, sodium 4,4' -dibromodiphenylsulfone-3-sulfonate, calcium 4-chloro-4 ' -nitrobenzenesulfone-3-sulfonate, disodium diphenylsulfone-3, 3' -disulfonate, or a combination of two or more of the foregoing.

The present invention further relates to a method of making a composition as disclosed herein, the method comprising combining in a melt mixing device a polycarbonate, an acid stabilizer, and an anthraquinone-based colorant having at least one hydroxyl group, and optionally one or more of a red colorant, a blue colorant, a yellow colorant, and an orange colorant, followed by melt mixing the composition into a substantially homogeneous composition.

The present invention further relates to a molded, preferably injection molded, article comprising or consisting of the polycarbonate composition of the invention. The molded article preferably has a portion having a thickness of 0.1 to 10mm, preferably 2 to 7mm, more preferably 4 to 6 mm. Such parts are parts which are preferably used for transmitting and/or receiving infrared radiation, such as those transmitted and/or received by sensors in the automotive industry.

The present invention further relates to an extruded sheet comprising the composition disclosed herein and any thermoformed article made from such sheet.

The present invention also relates to a detection system comprising the injection molded article disclosed herein and a sensor, wherein the sensor detects infrared radiation traveling through the injection molded article. In other words, the invention also relates to a detection system comprising an injection molded article as disclosed herein and a sensor capable of detecting infrared radiation travelling through the injection molded article.

In use, such a detection system is preferably configured such that the sensor cannot be observed during normal use of the panel. For example, sensors cannot be viewed from outside a vehicle when incorporated into the vehicle. This can be achieved when the composition has a transmission of at most 50%, preferably at most 10%, in the visible wavelength range of 380-740nm (for 2mm injection molded plaques). Examples of sensors for use in vehicles that may use infrared radiation are proximity and/or automotive detection sensors. A schematic example of such a detection system is shown in fig. 1, wherein the panel 1 is a panel (injection) molded from the composition disclosed herein. The sensor 2 is a sensor operating at a wavelength in the infrared wavelength range. The sensor 2 transmits and/or receives infrared radiation 3 travelling through the panel 1. Since the panel 1 has a relatively low visible light transmittance, the sensor cannot be observed from the side opposite to the side where the sensor 2 is placed.

The invention further relates to an electric vehicle, preferably an electric car, comprising the injection molded article or the detection system as disclosed herein.

The present invention relates to the use of an acid stabilizer, preferably a sulfonic acid or sulfonate ester, in a polycarbonate composition comprising an anthraquinone colorant having at least one hydroxyl group for the manufacture of molded articles at a temperature of at least 300 ℃ to maintain a transmittance of at least 80% in the infrared wavelength range of 760 to 1120 nm.

The present invention further relates to the use of an acid stabilizer, preferably a sulfonic acid or sulfonate ester, in a polycarbonate composition comprising an anthraquinone colorant having at least one hydroxyl group, for stabilizing the colorant.

The invention will now be further elucidated on the basis of the following non-limiting examples.

Examples

TABLE 1

The sample material was dried at 120 ℃ for 2.5 hours before injection molding. Unless otherwise stated, all compositions were compounded on a Werner & Pfleiderer co-rotating twin screw extruder (length/diameter (LID) ratio 30/1, vacuum holes located near the die face). The twin screw extruder has sufficient distributive and dispersive mixing elements to produce good mixing between the polymer compositions. The composition was then molded on an Engel-75 injection molding machine according to ISO 294. The dimensions of the molded test specimens were 60X 2 mm.

The following temperature profile was used for the extruder of the injection molding machine:

the residence time of the material in the screw is controlled by the cooling of the injection molded plate. In the following table "temperature" refers to the temperature of zone 3 of the extruder.

The optical properties were determined on injection-molded plaques having a thickness of 2mm and a width and length of 50mm each, using a Perkin Elmer labsphere 950 UV-visible-near-IR spectrophotometer, measured in transmission mode using an integrating sphere. The measurement is carried out at room temperature, i.e. 25 ℃. Transmittance is the ratio of the intensity of light received at the sensor to the intensity of light transmitted through the sample. Usually this is expressed as a percentage, i.e. T% ═ 100 × (I)_Detector/I₀) In which I_DetectorIs the intensity of light detected by the detector, and I₀Is the intensity of light delivered into the sample. This is known per se to the skilled person. Therefore, the transmittance was measured in the transmittance mode using a spectrophotometer with an integrating sphere. The transmission reported here is expressed as a percentage.

TABLE 2

		CE0	CE1	CE2	CE3	CE4	CE5	CE6	CE7
										PC1	[ weight% ]]	20	20	20	20	20	20	20	20.
PC2	[ weight% ]]	79.31	79.31	79.31	79.31	79.31	79.31	79.31	79.31
										UV	[ weight% ]]	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
Release agent	[ weight% ]]	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
										Stabilizer 1	[ weight% ]]	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
AO	[ weight% ]]	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02
										Stabilizer 2	[ weight% ]]	-	-	-	-	-	-	-	-
SRd135	[ weight% ]]	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.03
										SRd52	[ weight% ]]	0.023	0.023	0.023	0.023	0.023	0.023	0.023	0.023
SGr28	[ weight% ]]	0.067	0.067	0.067	0.067	0.067	0.067	0.067	0.067
										Temperature of	[℃]	280	300	300	300	320	320	320	340
Time	[min]	5	10	30	60	10	30	60	10
										T_720	[％]	0.1	0.04	0.3	1.1	0.2	2.0	4.3	3.1
T_740	[％]	3.0	1.8	2.9	4.0	2.6	5.35	6.1	6.5
										T_820	[％]	87.5	82.9	59.2	39.4	58.8	39.3	27.6	33.9
T_820-920	[％]	89.1	87.5	73.7	57.9	73.0	57.5	49.7	51.9

Time refers to the residence time of the composition in the extruder of the injection molding apparatus.

T _720, T _740, and T _820 refer to transmittances at wavelengths of 720nm, 740nm, and 820nm, respectively.

T _ 820-.

From table 2 it can be observed that the transmission of the test specimen in the infrared wavelength range drops significantly under more severe molding conditions, i.e. increased temperature and/or increased residence time.

TABLE 3

		CE8	CE9	CE10	CE11
						PC1	[ weight% ]]	20	20	20	20
PC2	[ weight% ]]	79.23	79.21	79.23	79.08
						UV	[ weight% ]]	0.15	0.15	0.15	0.15
Release agent	[ weight% ]]	0.3	0.3	0.3	0.3
						Stabilizer 1	[ weight% ]]	0.05	0.05	0.05	0.05
AO	[ weight% ]]	0.02	0.02	0.02	0.02
						Stabilizer 2	[ weight% ]]	-	-	-	-
SRd135	[ weight% ]]	0.12	0.12
						PB15:4	[ weight% ]]	0.01	0.03
G5B	[ weight% ]]	0.12	0.12	0.25	0.4
						Temperature of	[℃]	280	280	280	280
Time	[min]	5	5	5	5
						T_720	[％]	0.2	0.2	2.1	1
T_740	[％]	0.4	0.1	47.8	30.6
						T_820	[％]	81	72.9	89.7	88.6
T_820-920	[％]	88	86.6	89.4	88.9

TABLE 4

		CE12	CE13	CE14	CE15	CE16	CE17	CE18	CE19
										PC1	[ weight% ]]	20	20	20	20	20	20	20	20
PC2	[ weight% ]]	76.48	76.48	76.48	76.48	76.48	76.48	76.48	76.48
										UV	[ weight% ]]	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
Release agent	[ weight% ]]	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
										Stabilizer 1	[ weight% ]]	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
AO	[ weight% ]]	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02
										Stabilizer 2	[ weight% ]]	-	-	-	-	-	-	-	-
SGr3	[ weight% ]]	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
										Temperature of	[℃]	280	300	300	300	320	320	320	340
Time	[min]	5	10	30	60	10	30	60	10
										T_720	[％]	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
T_740	[％]	0.1	0.1	0.1	0.0	0.1	0.0	0.0	0.0
										T_820	[％]	67.2	72.2	54.4	30.0	42.4	18.3	10.3	15.9
T_820-920	[％]	73.5	77.6	68.2	53.8	62.2	42.6	27.1	41.9

TABLE 5

		E1	E2	E3	E4	E5	CE20	CE21	CE22
										PC1	[ weight% ]]	20	20	20	20	20	20	20	20
PC2	[ weight% ]]	79.3	79.3	79.3	79.3	79.3	79.3	79.3	79.3
										UV	[ weight% ]]	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
Release agent	[ weight% ]]	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
										Stabilizer 1	[ weight% ]]	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
AO	[ weight% ]]	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02
										Stabilizer 2	[ppm]	2	2	2	2	2	2	2	2
SRd135	[ weight% ]]	0.03	0.03	0.030	0.03	0.03	0.03	0.03	0.03
										SRd52	[ weight% ]]	0.023	0.023	0.023	0.023	0.023	0.023	0.023	0.023
SGr28	[ weight% ]]	0.067	0.067	0.067	0.067	0.067	0.067	0.067	0.067
										Temperature of	[℃]	280	300	300	300	320	320	320	340
Time	[min]	5	10	30	60	10	30	60	10
										T_720	[％]	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
T_740	[％]	0.1	0.1	0.1	0.0	0.1	0.0	0.0	0.0
										T_820	[％]	87.2	86.8	86.0	84.9	84.8	77.2	51.8	53.7
T_820-920	[％]	89.2	89.0	88.7	88.1	89.4	84.4	68.0	69.9

Table 5 shows that the addition of butyl tosylate in combination with solvent green 28 allows for relatively high transmission in the infrared wavelength range, even under severe molding conditions.

Claims

1. Polycarbonate composition comprising an interfacial polycarbonate, an acid stabilizer and at least one anthraquinone-based colorant having at least one hydroxyl group, wherein the composition has a transmission of at least 80% in the infrared wavelength range of 760-1120nm, wherein the transmission is determined on injection molded plaques having a thickness of 2mm prepared by injection molding the composition at a maximum temperature of 320 ℃ and a residence time of 10 minutes,

wherein the acid stabilizer is a sulfonic acid or sulfonate ester, an organophosphorous acid or ester thereof, or a combination comprising at least one of the foregoing.

2. The polycarbonate composition according to claim 1, wherein the transmission in the visible wavelength range of 380-740nm is at most 50%, preferably at most 10%.

3. The polycarbonate composition of claim 1 or 2, wherein the anthraquinone-based colorant is a green colorant, and wherein the composition further comprises one or more of a red colorant, a blue colorant, a yellow colorant, and an orange colorant, preferably a red colorant and a blue colorant.

4. The polycarbonate composition of any one or more of claims 1-3, wherein the hydroxyl-containing colorant is a green colorant, preferably solvent green 28, having a CAS registry 28198-05-2, 71839-01-5, or 4851-50-7.

5. The polycarbonate composition of any one or more of claims 1-4, wherein the acid stabilizer is a sulfonate ester, preferably butyl p-toluenesulfonate.

6. The polycarbonate composition of any one or more of claims 1-5, comprising a red colorant, a blue colorant, and a green colorant, wherein at least the green colorant is an anthraquinone-based colorant having at least one hydroxyl group, wherein based on the weight of the composition:

7. A method of making the composition of any one or more of claims 1-6, comprising combining the polycarbonate, the acid stabilizer, and the at least one anthraquinone-based colorant having at least one hydroxyl group, and optionally one or more of a red colorant, a blue colorant, a yellow colorant, and an orange colorant in a melt mixing device followed by melt mixing the composition into a substantially homogeneous composition.

8. The method of claim 7, wherein the acid stabilizer is included in the polycarbonate prior to combining the polycarbonate with the colorant in the melt mixing device.

9. An injection molded article comprising or consisting of the composition according to any one or more of claims 1 to 6.

10. The injection molded article according to claim 9, wherein the article is a panel for use in or on a vehicle, preferably an electric vehicle, more preferably an electric car.

11. The injection molded article of claim 10, wherein the article is an exterior front panel for an electric vehicle.

12. A method of making the article of any one or more of claims 9-11, comprising injection molding the composition of any one or more of claims 1-6.

13. A detection system comprising the injection molded article of any one or more of claims 9-11 and a sensor, wherein the sensor is capable of detecting infrared radiation traveling through the injection molded article.

14. Electric vehicle, preferably an electric car, comprising an injection molded article according to any one or more of claims 9-11 and/or a detection system according to claim 13.

15. Use of an acid stabilizer, preferably a sulfonic acid or sulfonate ester, in a polycarbonate composition comprising an anthraquinone colorant having at least one hydroxyl group, for the manufacture of a molded article at a temperature of at least 300 ℃ to maintain a transmittance of at least 80% in the infrared wavelength range of 760 to 1120 nm.