Polyolefin compositions useful for construction articles for outdoor use, for instance house siding, cladding, soffit or roofing. The compositions comprise a polyolefin substrate which has incorporated therein one or more additives selected from the group consisting of a) one or more ultraviolet light absorbers, b) one or more hindered amine light stabilizers and c) one or more antioxidants. Advantageously, the polyolefin substrate also has incorporated therein d) one or more colorants, e) one or more fillers, f) one or more flame retardants and optionally g) one or more antimicrobial compounds. The compositions exhibit certain performance levels according to standard tests, for example impact strength of >35 in-lb per ASTM D4226, coefficient of linear thermal expansion of <4.5×10E-05 in/in/ft per ASTM D696 and optionally acceptable color uniformity in finished siding parts per ASTM D6864 and/or acceptable low delta E color for the intended application per ASTM D2244 and/or a UL-94 V-1 or V-0 rating and/or a flame spread index of <200 according to ASTM E-84.
聚烯烃组合物适用于户外建筑用品,例如房屋护墙板、覆层、檐口或屋顶。这些组合物包括聚烯烃基材,基材中含有一种或多种添加剂,这些添加剂选自 a)一种或多种
紫外线吸收剂;b)一种或多种受阻胺
光稳定剂;c)一种或多种
抗氧化剂。更有利的是,聚烯烃基材中还加入了 d) 一种或多种
着色剂、e) 一种或多种填料、f) 一种或多种阻燃剂,以及 g) 一种或多种抗菌化合物。根据标准测试,这些组合物具有一定的性能
水平,例如,根据 ASTM
D4226 标准,冲击强度大于 35 英寸-磅;根据 ASTM D696 标准,线性热膨胀系数小于 4.5×10E-05 英寸/英寸/英尺;根据 ASTM D6864 标准,成品护墙板部件的颜色均匀度可接受;和/或根据 ASTM D2244 标准,预期应用的低 delta E 颜色可接受;和/或根据 ASTM E-84 标准,UL-94 V-1 或 V-0 等级;和/或火焰蔓延指数小于 200。