Process for recycling polyolefin cross-linked substance or polyo

Details Process for recycling polyolefin cross-linked substance or polyo Process for recycling polyolefin cross-linked substance or polyo

1997-09-11

2000-07-18

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 41, 521 42, 521 95, 521142, 521144, 521147, C08F 1104, C08F 1110

Patent

active

060908629

ABSTRACT:
A process is developed for recycling a polyolefin cross-linked substance having a cross-linkage, a polyolefin foamed substance free from a cross-linkage or a polyolefin foamed substance having a cross-linkage. The process includes the step of heating the polyolefin cross-linked substance together with a cross-linkage breaking agent, whereby breaking the cross-linkage to recycle the polyolefin cross-linked substance into a moldable thermoplastic resin. Further, the process includes the step of adding a foaming-agent-decomposition facilitating agent to the polyolefin foamed substance in the course of thermally melting the polyolefin foamed substance, whereby decomposing a residual foaming agent remaining in the polyolefin foamed substance. Furthermore, the process includes the step of adding a foaming-agent-decomposition facilitating agent to the polyolefin foamed substance in the course of heating the polyolefin foamed substance to break the cross-linkage, whereby decomposing a residual foaming agent remaining in the polyolefin foamed substance. The resulting recycled product is improved in terms of moldability, strength, elongation and superficial appearance.

REFERENCES:
patent: 4246211 (1981-01-01), Kunel
patent: 4255372 (1981-03-01), Kuhnel et al.
patent: 5149774 (1992-09-01), Patel et al.

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