Rapid recoverable PTFE and a process for its manufacture.

摘要

This invention relates to porous polytetrafluoroethylene (PTFE) materials having the property of rapid recovery and a process for producing these materials. The microstructure of the porous PTFE material consists of nodes interconnected by fibrils, substantially all of the fibrils having a bent or wavy appearance. The process comprises extruding a billet of a mixture of coagulated dispersion of PTFE and liquid lubricant, removing the lubricant, stretching the material longitudinally and maintaining it at a temperature between 35 DEG C and the crystalline melt point during stretching, compressing the PTFE in the direction of fibrils to reduce its size, restraining the PTFE in its compressed state, and heating the compressed PTFE.