Patent ID: 6638454
Filing Date: 2003-10-28
Classification: B29C,B29D,B29K,B29L,B60R

Abstract:
A process for producing plastic materials comprising:(a) providing an injection mold machine having a cavity therein for forming of a transparent plastic article simulating glass, said mold including a pressure sensing and regulating apparatus; (b) closing the mold and injecting a clear plastic material into the mold and using a portion of the mold to pressurize the mold such that a portion of the mold material is forced back into an injection port formed in the mold, the injection port being in communication with at least a portion of said cavity of said mold; and (c) maintaining the mold at a predetermined pressure wherein internal stress in said plastic material is reduced for optimizing optical properties of said plastic material to be similar to glass for mirrors; wherein a vehicle mirror element is formed from said plastic material.