TREATMENT OF FILAMENTS OR YARN

摘要

A method for treating an aromatic polyamide filament or yarn to improve its adhesion to rubber wherein, the method comprises exposing the filament or yarn to a first mixture of reagents comprising multi-functional isocyanate oligomers and multi-functional epoxy oligomers, wherein the ratio of total isocyanate groups to total epoxy groups in the mixture is in the range of from 0.8 to 1.2, and heating the exposed filament or yarn to a temperature of at least 100 degrees C. whereby the epoxy and isocyanate oligomers cross-link and form a network on the surface of the filament or yarn.

主权项

1. A method for treating a filament or yarn comprising:
(a) exposing the filament or yarn to a first mixture of reagents comprising first multi-functional isocyanate oligomers and first multi-functional epoxy oligomers, wherein the ratio of total isocyanate groups to total epoxy groups in the first mixture is in the range of from 0.8 to 1.2, and (b) heating the exposed filament or yarn at a temperature of at least 100 degrees C. whereby the first epoxy oligomers and first isocyanate oligomers cross-link and form a network on the surface of the filament or yarn, with the proviso that double bonds present in the first epoxy and first isocyanate oligomers do not participate in the crosslinking reaction.