CN1860382A - 反光制品及其制法 - Google Patents

反光制品及其制法 Download PDF

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CN1860382A
CN1860382A CNA2004800283077A CN200480028307A CN1860382A CN 1860382 A CN1860382 A CN 1860382A CN A2004800283077 A CNA2004800283077 A CN A2004800283077A CN 200480028307 A CN200480028307 A CN 200480028307A CN 1860382 A CN1860382 A CN 1860382A
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K·M·博尔斯特
R·R·加卢西
C·D·亚科文格洛
D·G·勒格兰
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Abstract

一种用于例如汽车大灯的反光制品,包括夹在耐热热塑性基材与反光金属层之间的防雾层。防雾层包含一种金属,其抗张模量至少约为100GPa(15×106磅每平方英寸)。该制品能防止反光层在高温起雾。

Description

反光制品及其制法
背景技术
包含热塑性基材和反光金属层的反光制品目前应用于各种各样的产品领域,包括汽车大灯反射器。此类制品虽可在环境温度下很好地工作,但在某些制造和使用条件中遇到的高温下,其反射率却可能因在反射涂层中雾状的形成而打折扣。
因此,目前需要能够在高温保持其反射率的反光制品。
概述
一种实施方案是表现出改善的耐热的反光制品,包含:含有无定形热塑性树脂的基材,其热畸变温度至少约140℃,按照ASTM D648在66磅每平方英寸(psi)条件下测定;反光金属层;以及夹在基材与反光金属层之间的防雾层,其中防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTM D638在25℃测定。
其它实施方案,包括制备反光制品的方法,将在下面详细描述。
附图简述
图1是反光制品10的分解图,包括热塑性基材20、反光金属层30和防雾层40。
优选实施方案详述
一种实施方案是一种反光制品,包括:基材,它包含无定形热塑性树脂,其热畸变温度至少约140℃,按照ASTM D648在66磅每平方英寸(psi)条件下测定;反光金属层;以及夹在基材与反光金属层之间的防雾层,其中防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTM D638在25℃测定。
在汽车大灯用反射器的商业开发期间有时观察到,通过热塑性基材的金属化直接制成的反射器起初常表现出卓越反射率,但是在使用的条件下,将发生反射表面的起雾,导致零件的失效。通过对各种不同材料的广泛研究,本发明人发现,高温条件下的起雾可通过在热塑性基材与反光金属层之间插入一个防雾层来减轻或消除,该防雾层的抗张模量至少约15×106磅每平方英寸,按照ASTM D638在25℃测定。如下面所详细叙述的,各种材料都适用于制造防雾层,但它们在其机械性能方面必须兼备。
基材包含无定形热塑性树脂,其热畸变温度至少约140,优选至少约170℃,更优选至少约185℃,进一步优选至少约200℃,按照ASTMD648在66磅每平方英寸(psi)条件下测定。合适的热塑性树脂包括,例如,聚醚酰亚胺、聚醚酰亚胺砜、聚砜、聚醚砜、聚苯醚砜、聚(亚芳基醚)、聚碳酸酯、聚酯碳酸酯、聚芳酯等,及其混合物。这些热塑性树脂及其制备方法在技术上是公知的。
优选的聚醚酰亚胺包括包含通式(I)结构单元的那些
其中二价T部分桥联相应通式(I)芳基酰亚胺部分的3,3′、3,4′、4,3′或4,4′部位;T是-O-或通式-O-Z-O-的基团;Z是二价基团,选自通式(II)
Figure A20048002830700052
Figure A20048002830700061
其中X是选自通式(III)的二价基团的成员
-CyH2y-, -O-,和-S-(III)
其中y是1~约5的整数,且q是0或1;R是二价有机基团,选自(a)6~20个碳原子的芳烃基团及其卤化衍生物,(b)2~约20个碳原子的亚烷基基团,(c)3~约20个碳原子的亚环烷基基团,以及(d)通式(IV)的二价基团
其中Q是共价键或选自通式(V)的成员
-Cy′H2y′-, -O-,和-S-(V)
其中y′是1~约5的整数。
在上面的通式中,当X或Q含有二价砜键时,该聚醚酰亚胺可看作聚醚酰亚胺砜。
一般而言,有用的聚醚酰亚胺的熔体指数为约0.1~约10g/min,按照ASTM D1238在337℃采用6.6kg重量测定。
在优选的实施方案中,聚醚酰亚胺树脂的重均分子量介于约10,000~约150,000原子质量单位(AMU),采用凝胶渗透色谱术以聚苯乙烯为标准物测定。此种聚醚酰亚胺树脂的典型特性粘度大于约0.2dl/g,在间甲酚中在25℃测定。优选的特性粘度至少为约0.35dl/g。另外,还优选约0.7dl/g的特性粘度。
在多种制造聚醚酰亚胺树脂的方法当中,包括在下列文献中描述的那些,例如,美国专利3,847,867,授予Heath等人,3,850,885,授予Takekoshi等人,3,852,242和3,855,178,授予White和3,983,093,授予Williams等人。
在优选的实施方案中,聚醚酰亚胺树脂包含这样的通式(I)结构单元,其中每个R独立地是对亚苯基或间亚苯基并且T是通式(VI)的二价基团。
Figure A20048002830700071
特别优选的聚醚酰亚胺树脂是2,2-双[4-(3,4-二羧基苯氧基)苯基]丙烷二酸酐与一种或多种对苯二胺和间苯二胺的熔融聚合生成的产物。聚醚酰亚胺可从通用电气公司作为商品名ULTEM树脂购得,例如,ULTEM1000、ULTEM1010、ULTEM6000、ULTEMXH6050、ULTEMCRS5000。聚醚酰亚胺聚合物的进一步描述可见诸于,例如,ASTM 5205,聚醚酰亚胺(PEI)材料的标准类别体系。
适合用于热塑性基材的聚砜是包含具有至少一个砜基团的重复单元的聚合物。聚砜及其制备方法在技术上是熟知的,描述在,例如,美国专利3,642,946,授予Grabowski等人;以及Kirk-Othmer,《化学工艺大全》第二版,卷16,pp.272~281(1968)。此类型代表性聚合物包括聚砜、聚醚砜和聚苯砜。
可用于本发明的聚砜包含至少一个由通式(VII)代表的重复结构单元
Figure A20048002830700072
其中每个重复单元Ar独立地为未取代亚苯基或取代上苯基、C1~C12烷基、C1~C12烷氧基、卤素、硝基之类基团的亚苯基;并且每个A独立地是直接碳-碳键、C1~C12烷叉、C3~C8环烷叉、羰基亚砜、硫、砜、偶氮、亚氨基、氧等。
通式(VII)的聚砜优选由二氯二苯砜与双酚起反应衍生而来。第二类由通式VII代表的砜是这样的砜,其中每个Ar是亚苯基,且A是砜。第三大类由通式VII代表的聚砜是那些,其中每个Ar是亚苯基并且A是氧,即,聚芳基醚砜。当Ar是亚苯基时,它优选地应为间位或对位并且在环上可取代上C1~C6烷基基团、C1~C6烷氧基基团之类。特别优选的聚砜是由二磺酰氯如4,4-联苯二磺酰氯与4,4′-二羟基二苯醚起反应衍生的那些。
聚醚砜,包括聚苯醚砜,至少含有以下重复结构单元
和/或
Figure A20048002830700082
和/或
其中R、R1和R2独立地选自C1~C6烷基、C4~C8环烷基、和卤素基团;W是C2~C8亚烷基、C1-C8烷叉、含4~约16个环碳原子的亚环烷基或环烷叉基团等;b是0或1;并且n、n1和n2独立地是0、1、2、3或4。有关聚砜的附加说明可见诸于ASTM D6394,“聚砜塑料(SP)的标准规格”。
合适的聚芳醚包括聚苯醚(PPE)和聚(亚芳基醚)共聚物;接枝共聚物;聚(亚芳基醚)醚离聚物;和链烯基芳族化合物、乙烯基芳族化合物和聚(亚芳基醚)的嵌段共聚物以及诸如此类;以及含有上述至少一种的组合;以及诸如此类。聚(亚芳基醚)是公知的含有大量下列通式结构单元的聚合物
Figure A20048002830700091
其中对于每个结构单元来说,每个Q1独立地是卤素、伯或仲C1~C8烷基、苯基、C1~C8卤代烷基、C1~C8氨烷基、C1~C8烃氧基或C2~C8卤代烃氧基,其中至少两个碳原子将卤素和氧原子分开;并且每个Q2独立地是氢、卤素、伯或仲C1~C8烷基、苯基、C1~C8卤代烷基、C1~C8氨烷基、C1~C8烃氧基或C2~C8卤代烃氧基,其中至少两个碳原子将卤素和氧原子分开;优选的是,每个Q1是烷基或苯基,尤其是C1~C4烷基,并且每个Q2独立地是氢或甲基。
均聚和共聚的聚(亚芳基醚)都包括在内。优选的均聚物是包含2,6-二甲基苯醚单元的那些。合适的共聚物包括无规共聚物,含有,例如,此类单元与2,3,6-三甲基-1,4-亚苯基醚单元的组合,或者由2,6-二甲基苯酚与2,3,6-三甲基苯酚共聚衍生的共聚物。2,6-二甲基苯酚和2,3,6-三甲基苯酚的此类共聚物,尤其是含有约5~约50wt%由2,3,6-三甲基苯酚衍生的单元的那些,因其耐热性好而特别优选。还包括这样的聚(亚芳基醚),它含有通过乙烯基单体或聚合物如聚苯乙烯的接枝制备的部分,以及偶联的聚(亚芳基醚),其中偶联剂如低分子量聚碳酸酯、醌、杂环和缩甲醛按照已知的方式与2个聚(亚芳基醚)的羟基基团起反应生成一个较高分子量聚合物。本发明的聚(亚芳基醚)还包括任何上面列举化合物的组合。
聚(亚芳基醚)的数均分子量一般介于约3,000~约40,000原子质量单位(AMU)并且重均分子量介于约20,000~约80,000AMU,按照凝胶渗透色谱术测定。聚(亚芳基醚)的特性粘度通常介于约0.2~约0.6dl/g,在氯仿中在25℃测定。在这一范围内,特性粘度优选最高约0.5dl/g,更优选最高约0.47dl/g。还是在这一范围内,特性粘度优选至少约0.3dl/g。也可组合使用高特性粘度聚(亚芳基醚)和低特性粘度聚(亚芳基醚)。当使用2种特性粘度时,确切比例的决定取决于所用聚(亚芳基醚)的确切特性粘度和所要求的最终物理性能。
聚(亚芳基醚)的典型制备是通过至少一种单羟基芳族化合物如2,6-二甲苯酚或2,3,6-三甲基苯酚的氧化偶联。此种偶联通常采用催化剂体系。它们通常含有至少一种重金属化合物如铜、锰或钴化合物,通常与各种不同其它材料组合。适合制备聚(亚芳基醚)的方法描述在,例如,美国专利3,306,874和3,306,875,授予Hay,以及4,011,200和4,038,343,授予Yanemitsu等人。
合适的聚碳酸酯可通过二羟基苯酚与碳酸酯前体如光气、甲酰卤或碳酸酯起反应制备。一般而言,此类碳酸酯聚合物具有下列通式的重复结构单元
其中A是用于聚合物生成反应中的二羟基酚的二价芳族基团。优选的是,用于提供本发明树脂混合物的碳酸酯聚合物具有约0.30~约1.00dl/g的特性粘度(在二氯甲烷中在25℃测定)。用于提供此种芳族碳酸酯聚合物的二羟基酚可以是单核或多核芳族化合物,含有,作为官能团,2个羟基基团,每个直接连接在芳核的碳原子上。典型二羟基酚包括,例如,2,2-双(4-羟苯基)丙烷(双酚A);氢醌;间苯二酚;2,2-双(4-羟苯基)戊烷;2,4′-(二羟基二苯基)甲烷;双(2-羟苯基)甲烷;双(4-羟苯基)甲烷;双(4-羟基-5-硝基苯基)甲烷;1,1-双(4-羟苯基)乙烷;3,3-双(4-羟苯基)戊烷;2,2-二羟基联苯;2,6-二羟基萘;双(4-羟基二苯基)砜;双(3,5-二乙基-4-羟苯基)砜;2,2-双(3,5-二甲基-4-羟苯基)丙烷;2,4′-二羟基二苯基砜;5′-氯-2,4′-二羟基二苯基砜;双(4-羟基苯基)二苯基砜;4,4′-二羟基二苯基醚;4,4′-二羟基-3,3′-二氯二苯基醚;4,4′-二羟基-2,5-二羟基二苯基醚;以及诸如此类。
其它适用于制备聚碳酸酯树脂的二羟基酚描述在,例如,美国专利2,999,835,授予Goldberg,3,334,154,授予Kim,和4,131,575,授予Adelmann等人。
这些芳族聚碳酸酯可采用公知的方法制备,例如,并且如上面提到的,通过二羟基酚与碳酸酯前体如光气反应,按照上面给出的文献以及在美国专利4,123,436,授予Holub等人的专利中的方法,或例如授予Fox的美国专利3,153,008中公开的酯交换法,乃至本领域技术人员公知的其它方法来制备。
也可采用2或更多种不同二羟基酚或二羟基酚与二醇或与羟基-或酸-链端的聚酯或者与二元酸的共聚物,如果希望得到碳酸酯共聚物而不是均聚物的话。支化的聚碳酸酯也有用,例如,描述在美国专利4,001,184,授予Scott。也可使用线型聚碳酸酯与支化聚碳酸酯的共混物。而且,任何上述材料的共混物皆可用于实施本发明,以提供芳族聚碳酸酯。
这些聚碳酸酯可以是支化的或者线型的并且一般将具有约10,000~约200,000AMU的重均分子量,优选约20,000~约100,000,采用凝胶渗透色谱术测定。本发明聚碳酸酯可利用各种不同端基来改善性能。优选庞大的一元酚,例如,枯基酚。
合适的聚碳酸酯还包括由含有烷基环己烷单元的双酚衍生的那些。此类聚碳酸酯具有对应于下列结构式的结构单元
其中Ra~Rd彼此独立地是氢、C1~C12烃基,或卤素;并且Re~Ri各自独立地是氢、C1~C12烃基。如这里所使用的,“烃基”是指仅含有碳和氢的残基。该残基可以是脂族或芳族、直链、环状、双环、支化、饱和/或不饱和的。烃基残基,当这样称呼时,却可,除了该取代基残基的碳和氢之外,另外还含有杂原子。于是,当具体提到含有此种杂原子时,该烃基残基还可含有羰基基团、氨基基团、羟基基团等,或者它可在烃基残基主链内部含有杂原子。含有烷基环己烷的双酚,例如,2mol酚与1mol氢化异佛尔酮的反应产物,可用于制备高玻璃化转变温度和高热畸变温度的聚碳酸酯树脂。此类含异佛尔酮双酚的聚碳酸酯具有对应于下列结构式的结构单元
Figure A20048002830700121
其中Ra~Rd如上面所定义。这些基于异佛尔酮双酚的树脂,包括含有非-烷基环己烷双酚的聚碳酸酯共聚物以及含烷基环己基双酚的聚碳酸酯与非烷基环己基双酚聚碳酸酯的共混物,由拜尔公司以商品名APEC销售并描述在,例如,美国专利5,034,458中,授予Serini等人。
合适的热塑性树脂还包括“聚芳酯”,这是涉及芳族二羧酸与双酚的聚酯的总称。聚芳酯共聚物,除了芳基酯键之外还包括碳酸酯键,即所谓聚酯-碳酸酯,也是合适的。这些树脂可单独使用也可与彼此组合,或者更优选地与双酚聚碳酸酯组合起来使用。这些树脂可在溶液中或者通过熔融聚合由芳族二羧酸或其成酯衍生物与双酚和其衍生物来制备。合适的二羧酸是间-和对苯二甲酸、其酯或酰氯。优选的二酚是双酚A或其二乙酸酯衍生物。聚酯碳酸酯和聚芳酯也可含有由羟基羧酸如羟基苯甲酸衍生的键。最优选的聚酯-碳酸酯和聚芳酯是由双酚A与间苯二甲酸和对苯二甲酸的混合物衍生的无定形树脂。合适的聚芳酯及其制备描述在,例如,美国专利4,663,421,授予Mark。合适的聚酯-碳酸酯及其制备描述在,例如,描述在3,169,121,授予Goldberg,和4,156,069,授予Prevorsek等人。
在一种实施方案中,基材含有至少约50wt%,优选至少约80wt%,更优选至少约90wt%,进一步优选至少约95wt%,热塑性树脂。
在一种实施方案中,基材除了热塑性树脂之外还包含无机填料,例如,滑石粉、云母、粘土、二氧化钛、氧化锌、硫化锌、硅灰石或诸如此类,或其混合物。
在另一种实施方案中,基材基本上不含无机填料。“基本不含无机填料”在这里被定义为含有少于0.1wt%无机填料。优选的是,基材含有少于0.01wt%无机填料。
基材树脂还可含有改进熔融加工、模塑或零件稳定性的添加剂。有用的添加剂包括润滑剂和脱模剂,例如,脂族酯,例如,季戊四醇的四硬脂酸酯,或聚烯烃,例如,高密度聚乙烯。稳定剂,例如,芳基亚磷酸酯和位阻酚,也可与基材树脂掺混。其它添加剂包括减少静电荷聚积的化合物。如果在基材中使用,重要的是选择那些保持热稳定,表现出低挥发性并且不对金属化制品中的雾化做出贡献的添加剂。
在一种实施方案中,该无定形热塑性塑料的密度小于1.7g/mL,优选小于1.6g/mL,更优选小于1.5g/mL。无定形热塑性树脂的密度可按照ASTM D792在25℃测定。因此,该无定形热塑性树脂的密度小于通常成形反光制品用的预制整体模塑料。当反光制品是大灯反射器时,该无定形树脂的应用可减轻大灯的重量,因此对允许每加仑燃料行驶更多里程的重量减轻做出贡献。
在一种实施方案中,无定形热塑性树脂的有机挥发分含量小于1,000ppm(重量),优选小于750ppm(重量),更优选小于500ppm(重量),按照ASTM D4526测定。根据ASTM D4526的规定,挥发分的测定方法是,采集在90℃下与热塑性树脂达到平衡的上部封闭空间的样品,并采用火焰电离检测对样品进行定量分析。在该实施方案中,该有机挥发分含量低于预制整体模塑料,后者可含有高浓度在高温下释放气体并降低反光金属层反射率的残余单体。
基材的尺寸取决于反光制品的用途。例如,当反光制品是大灯反射器时,其厚度可介于约0.1~约20mm,沿垂直于防雾层和反光金属层的尺寸计;在这一范围内,厚度优选至少为约0.5mm,更优选至少约1mm;还是在这一范围内,厚度优选最高约10mm,更优选最高约8mm。
反光制品包含反光金属层。适合用于反光金属层的金属包括周期表的族IIIA、IIIB、IVB、VB、VIB、VIIB、VIII、IB和IIB,的金属。这些金属的混合物和合金也可使用。优选的金属包括铝、银、金、镍、钯、铂、铜以及诸如此类,和包含至少一种上述金属的合金。铝及其合金是作为反光金属层特别优选的金属。
反光金属层可采用技术上公知的方法成形,包括溅射、真空金属沉积、蒸汽-电弧沉积、等离子化学蒸汽沉积、热蒸汽金属沉积和离子镀膜。
反光金属层的厚度可介于约1~约1000nm。在这一范围内,厚度优选至少为约10nm,更优选至少约20nm。还是在这一范围内,厚度优选最高约500nm,更优选最高约200nm。
反光制品包括夹在基材和反光金属层之间的防雾层。防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,抗张模量优选至少为约20×106磅每平方英寸,更优选至少约30×106磅每平方英寸,按照ASTM D638在25℃测定。
优选的高抗张模量金属包括锑、铋、铯、铬、钴、铜、铱、铁、钼、镍、钯、铂、铑、钽、钛、钨、钒及其合金。用于防雾层的特别优选的金属包括铬及其合金。
防雾层可用公知的金属镀膜方法来形成,包括例如溅射、真空金属沉积、蒸气亚弧沉积、等离子化学蒸气沉积、热蒸气沉积以及离子镀膜。
在一种实施方案中,防雾层包含至少约50wt%,优选至少约80wt%,更优选至少约90wt%,进一步优选至少约95wt%高抗张模量金属,以防雾层总重量为基准计。
防雾层的厚度将取决于其组成,但它一般为约1nm~约1000nm。在此范围内,该厚度优选至少为约20nm,更优选至少约50nm。还是在此范围内,厚度可优选地最高约500nm,更优选最高约200nm。
虽然该基材能很好地适应直接施涂防雾层,但也可在基材上预涂底漆,然后再施涂防雾层。也可能有利的是给反光制品进一步涂以透明、坚硬保护层,以保护反光金属层免遭划伤、氧化或相关问题。保护层可以,优选地,表现出大于90%测量的纳米值的透射率,按照ASTM D1003测定。保护层可以,优选地,表现出小于5的黄色指数,按照ASTM D1925测定。合适的组合物以及制备金属氧化物保护层的方法描述在,例如,美国专利6,110,544,授予Yang等人,和6,379,757B1,授予Lacovangelo。于是,在一种实施方案中,反光制品包括保护层,其中防雾层夹在基材与反光层之间,而反光层夹在防雾层和保护层之间。
在一种优选的实施方案中,反光制品包含反射率至少是80%,更优选至少约85%,进一步优选至少约90%,按照ASTM D523测定的表面。在高度优选的实施方案中,反光制品包含反射率至少是80%,更优选至少约85%,进一步优选至少约90%的表面,在暴露于基材中的任何热塑性树脂的最低热畸变温度15min后(测定)。反光制品耐雾化的温度受热塑性基材性能的影响。热畸变温度或玻璃化温度较高的树脂具有较高的耐热性。对于给定的树脂基材而言,采用置于该基材上的高模量金属减雾层,并涂覆第二反光金属层比采用单独的反光层将能提供更好的耐雾化形成性。
要理解的是,防雾层和反光金属层是有区别的,而且无意让单个金属层来起到这两种作用。在一种实施方案中,该防雾层和反光层有不同的组成。
图1给出一部分反光制品10的分解透视图。防雾层40夹在基材20与反光金属层30之间。
反光制品可用作,例如,汽车大灯反射器、结合到投影仪灯泡内的反射器、任何形状和曲率的镜子。大灯反射器及其制备描述在,例如,美国专利5,503,934,授予Maas等人和6,355,723B1,授予van Baal等人。
在青睐简单的实施方案中,反光制品主要包括:基材,它包含热畸变温度至少约140℃,在66psi按照ASTM D648测定的无定形热塑性树脂;反光金属层;和夹在基材与反光金属层之间的防雾层,其中防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTM D638在25℃测定。
在优选的实施方案中,反光制品包含:基材,它包含玻璃化转变温度至少约170℃的聚砜树脂;含铝的反光金属层;和夹在基材与反光金属层之间的防雾层,其中防雾层包含铬,且抗张模量至少约30×106磅每平方英寸,按照ASTM D638测定。
另一实施方案是一种制备反光制品的方法,包括:施涂防雾层到基材表面上,其中防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTM D638测定,且其中基材包含热畸变温度至少约140℃,按照ASTM D648在66磅每平方英寸条件下测定的无定形热塑性树脂;并施加反光金属层到防雾层表面上。
本发明将通过下面的非限制性实例进一步加以说明。
对比例1
3.2mm厚度的聚醚酰亚胺(VLTEM 1010)试样板用300W直流(DC)磁控管源通过真空溅射镀铝而金属化,形成厚度为约100-200nm的反光层。将该试样板放入温度顺序设定为190、200和215℃的对流空气炉中。在215℃经15分钟后,该反光层显现出发雾和退色。
对比例2
按照对比例1的程序,所不同的是聚酰亚胺试样板用DC磁控管先溅射喷镀60nm厚度的金膜,然后再喷镀100-200nm厚度的铝膜。所生产的样品的炉中热处理结果与没有金膜的样品相似:在215℃经15分钟后,该反光层显现出发雾和退色。
对比例3
按照对比例1的程序,所不同的是聚酰亚胺试样板用DC磁控管溅射喷镀60nm厚金膜,而不用铝进行金属化。所生产的样品的炉中热处理结果与镀铝样品相似:在215℃经15分钟后,该反光层显现出发雾和退色。
实例1
3.2mm厚度的聚醚酰亚胺(VLTEM 1010)试样板用300W直流(DC)磁控管源通过真空溅射镀铬而金属化,形成厚度为15nm的铬减雾层,接着再镀上100-200nm铝反光层。在对流炉中215℃经30分钟后观察到该反光层上出现雾气。在215℃产生雾气的时间是没有减雾层的对比例1或在铝反光层下有金属的对比例3的2倍。
实例2
按照实例2的程序,所不同的是铬减雾层的厚度增加至100nm。在对流炉中215℃经75分钟后观察到该反光层上出现雾气。将实例1和实例2进行比较表明产生雾气的时间随着铬防雾层厚度的增加而增加。
虽然本发明已就优选实施方案做了描述,但本领域技术人员将懂得,在不偏离本发明精神和范围的条件下可做出各种不同修改并且许多等价物的要素可做变换。另外,可对特定情况和材料做多种修改以适应本发明而不偏离本发明实质范围。因此,要指出,本发明不拟局限于考虑作为本发明实施的最佳模式所公开的特定实施方案,而是,本发明将包括属于所附权利要求范围内的所有实施方案。
所有援引的专利、专利申请和其它参考文献一律全文收入本文作为参考。

Claims (10)

1.一种反光制品(10),包含:
含有无定形热塑性树脂的基材(20),其热畸变温度至少约140℃,按照ASTM D648在66磅每平方英寸(psi)条件下测定;
反光金属层(30);以及
夹在基材与反光金属层之间的防雾层(40),其中防雾层包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTM D638在25℃测定。
2.权利要求1的反光制品(10),其中无定形热塑性树脂选自聚醚酰亚胺、聚醚酰亚胺砜、聚砜、聚醚砜、聚苯醚砜、聚(亚芳基醚)、聚碳酸酯、聚酯碳酸酯、聚芳酯,及其混合物。
3.权利要求1的反光制品(10),其中反光金属层(30)包含选自铝、银、金、镍、钯、铂、铜及其合金的金属。
4.权利要求1的反光制品(10),其中反光金属层(30)的厚度介于约10~约1000nm。
5.权利要求1的反光制品(10),其中防雾层(40)包含选自下列的金属:锑、铬、钴、铜、铱、铁、钼、镍、钯、铂、铼、铑、钽、钛、钨、钒及其合金。
6.权利要求1的反光制品(10),其中防雾层(40)包含铬。
7.权利要求1的反光制品(10),其中防雾层(40)的厚度介于约1nm~约1000nm。
8.权利要求1的反光制品(10),还包含保护层,其透射百分率至少是90%,按照ASTM D1003测定,其中反光层夹在防雾层和保护层之间。
9.一种反光制品(10),包含:
基材(20),含有聚醚酰亚胺树脂,其玻璃化转变温度至少为约170℃;
反光金属层(30),含有铝;以及
防雾层(40),夹在基材与反光金属层之间,其中防雾层包含铬,且其抗张模量至少约30×106磅每平方英寸,按照ASTM D638在25℃测定。
10.制备反光制品(10)的方法,包括:
施涂防雾层(40)到基材(20)的表面上,其中防雾层(40)包含一种金属,其抗张模量至少约15×106磅每平方英寸,按照ASTMD638在25℃测定,并且其中基材(20)包含一种无定形热塑性树脂,其热畸变温度至少约140℃,按照ASTM D648在66磅每平方英寸条件下测定;以及
施加反光金属层(30)到防雾层(40)的表面上。
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