ACCELERATOR-FREE THIN-WALLED RUBBER VULCANIZATES FROM LATEX

摘要

THIN-WALLED RUBBER ARTICLES FOR USE CONTACT WITH LIVING TISSUE OR WITH MATERIALS TO BE DELIVERED TO LIVING TISSUE ARE PREPARED FROM AQUEOUS LATEX OF EITHER NATURAL RUBBER OR SYNTHETIC CIS-1,4-POLYISOPRENE BY VULCANIZATION TO PRODUCE BOTH CARBON-CARBON AND CARBON-(SULFUR)N-CARBON CROSSLINKS, THE VULCANIZATION BEING PERFORMED IN THE ABSENCE OF ANY COMPOUNDING COMPONENTS THAT CONTAIN SECONDARY AMINE GROUPS OR ANY COMPONENTS THAT HAVE A TENDENCY TO PRODUCE NITROSAMINES. WHILE SULFUR ACTIVATORS MAY BE INCLUDED, IT IS PREFERABLE THAT NO SULFUR ACCELERATORS AT ALL BE INCLUDED. THIN-WALLED RUBBER ARTICLES FORMED FROM THE LATEX SURPRISINGLY EXHIBIT A COMBINATION OF HIGH TENSILE STRENGTH, HIGH ULTIMATE PERCENT ELONGATION, AND LOW 500% TENSILE MODULUS. THE PROCESS IS PARTICULARLY EFFECTIVE IN THE MANUFACTURE OF THIN-WALLED ARTICLES FROM SYNTHETIC CIS-1,4-POLYISOPRENE.