A process for producing a UV-stable laminated structure having thermal aging resistance includes coextruding the following layers in a single-stage operation, or laminating the following layers onto one another in a heatable roll nip:
a substrate layer made up of a graft copolymer and a styrene and/or (meth)acrylate/(meth)acrylonitrile copolymer, and optionally containing a polycarbonate and a fibrous and/or particulate filler; and
a transparent top layer of polymethyl methacrylate.
In another embodiment, an interlayer of e.g., impact-modified polymethyl methacrylate or polycarbonate, is coextruded or laminated between the transparent top layer and the substrate layer to produce a UV-stable laminated structure. An adhesion layer containing an adhesion promoter can be coextruded or laminated on the outer surface of the substrate layer.
A molding is produced by thermoforming the UV-stable laminated structure, which is advantageously backsprayed or back-cast with the substrate layer or a polyurethane foam. The molding can take the form of an automotive exterior bodywork component.
一种生产具有抗热老化性能的紫外线稳定层压结构的工艺,包括在单级操作中将以下各层共挤,或在可加热的辊压区内将以下各层相互层压:
由接枝共聚物和
苯乙烯和/或(甲基)
丙烯酸酯/(甲基)
丙烯腈共聚物组成的基材层,可选择含有聚
碳酸酯和纤维状和/或颗粒状填料;以及
聚甲基丙烯酸甲酯透明面层。
在另一个实施方案中,在透明顶层和基材层之间共挤或层压一层中间层,例如抗冲改性
聚甲基丙烯酸甲酯或聚
碳酸酯,以产生紫外线稳定的层压结构。含有附着力
促进剂的附着层可以共挤或层压在基材层的外表面。
通过对紫外线稳定的层压结构进行热成型,生产出成型件,成型件最好与基材层或聚
氨酯泡沫一起进行背喷或背铸。成型件可以是汽车外部车身部件。