申请人:The Geon Company
公开号:EP0529576A1
公开(公告)日:1993-03-03
This invention pertains to multilayer compositions, articles and processes for preparing and thermoforming said compositions and articles. Multilayer compositions exemplified comprise:
(A) a first layer of a polyvinyl chloride composition comprising the specified compounding ingredients and represented herein by preferred embodiments; and
at least one other layer (B) comprising:
a polyvinyl chloride composition together with specified and preferred compounding ingredients and including a heat distortion temperature improving additive, wherein the heat distortion temperature of the dominant phase, preferably a single phase, is at least three degrees celsius higher than said heat distortion temperature of said first layer.
Thermoformed articles of the invention are useful for example as inner-liners or door liner panels for referigerators where contact with HCFC chemicals, present in foam insulation, is necessary. Impact resistance is maximized, while chemical resistance and heat deflection temperature are maintained at performance levels acceptable in these applications.
本发明涉及多层组合物、物品以及制备和热成型所述组合物和物品的工艺。举例说明的多层组合物包括
(A) 第一层聚氯乙烯组合物,该组合物包含指定的复合成分,在此以优选实施例表示;以及
至少另一层(B),包括
聚氯乙烯组合物以及指定和优选的复合成分,并包括热变形温度改进添加剂,其中主相(优选单相)的热变形温度比所述第一层的热变形温度高至少三摄氏度。
例如,本发明的热成型物品可用作冰箱的内衬或门衬板,在这种情况下,需要与泡沫隔热材料中的氟氯烃化学品接触。本发明可最大限度地提高抗冲击性,同时将耐化学性和热变形温度保持在这些应用中可接受的性能水平。