LIGHTWEIGHT AMMUNITION ARTICLES COMPRISING A POLYMER CARTRIDGE CASE

An ammunition article comprises a polymer cartridge case formed of a polymer composition comprising a thermoplastic polymer, preferably the polymer composition having a density of less than 1.35 determined in accordance with ASTM D792, the polymer cartridge case having a first end, an opposing second end, and a chamber disposed between the first end and the second end for receiving a propellant; aprojectile attached to the first end of the polymer cartridge case; a metal base insert joined to the second end of the polymer cartridge case; and a primer carried by the metal base insert; whereinthe metal base insert and the polymer cartridge case remain joined together as a single piece assembly upon loading, firing and removal from a chamber of a firearm for a polymer case temperature of -65 DEG F (-54 DEG C) to 165 DEG F (74 DEG C). 一种弹药制品，包括由包含热塑性聚合物的聚合物组合物形成的聚合物药筒壳，优选该聚合物组合物具有根据ASTM D792测定的小于1.35的密度，该聚合物药筒壳具有第一端、相对的第二端以及设置在第一端和第二端之间用于接收发射火药的弹膛；附接到聚合物药筒壳的第一端的炮弹；连接到聚合物药筒壳的第二端的金属底座插入物；以及由金属底座插入物承载的底火；其中对于-65°F(-