Sealing material and its preparation

Abstract

Abstract PURPOSE:To prepare a sealing material composed of foamed core part and solid skin layer, having excellent elasticity and sealing properties, and suitable as a heat-resistant packing, etc. by the injection molding of an unvalcanized vulcanizable elastic material in the presence of a crosslinking agent and a foaming agent. CONSTITUTION:Unvulcanized or semivulcanized vulcanizable elastic material (preferably a silicone rubber, etc. for the packing of autoclave and acrylic rubber, etc. for the gasket of window frame) is mixed with a crosslinking agent and a foaming agent, and injection molded at a temperature preferably above the foaming temperature of the foaming agent and above the plastifying temperature of the material to obtain the objective sealing material composed of a foamed core and a solid skin layer having a substantial thickness (preferably >=0.5mm.) and enclosing said core part.

Inventors

• 👤 Hiroshi Fujita
• 👤 藤多　廣
• 👤 Yoshibumi Takeuchi
• 👤 竹内　義文
• 👤 Koji Shinohara
• 👤 幸司 篠原

Bibliographic Details