Kureha Kagaku Kogyo Kabushiki Kaisha

Satoshi Usui

Ken Kashiwadate

Yukio Ichikawa

Yoichiro Yamanobe

Kouichi Kodama

A pair of tubular products of polyarylene sulfide having end faces to be welded are welded to each other by heating the end faces by a hot plate in no contact with the end faces to a surface temperature which is at least the melting heat-absorption peak temperature and at most 80.degree. C. above the melting initiation temperature of the polyarylene sulfide, and abutting the end faces under a pressure of 50-1500 kPa when the end faces are at a surface temperature which is at least 10.degree. C. above the melting initiation temperature and not exceeding the melting heat-absorption peak temperature of the polyarylene sulfide. As a result, a welded tubular structure having a weld with a small inside bead but having a sufficiently large weld strength can be obtained with substantially no thermal degradation and at a good operating efficiency.

Method of welding tubular products of polyarylene sulfide and welded

In the process of chemical plating on a formed article composed of a polyarylene sulfide or a composition comprising a polyarylene sulfide as the predominant resin component, a method for selective chemical plating is provided, which comprises irradiating a portion not to be plated of the formed article with light of a wavelength of 0.1 nm to 800 nm and then subjecting the formed article to chemical plating.

Growing community of inventors

Iwaki, Japan

Satoshi Usui