Cross-linked polyurethane resin powder and process for producing

Details Cross-linked polyurethane resin powder and process for producing Cross-linked polyurethane resin powder and process for producing

1996-11-06

1999-09-28

Short, Patricia A.

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

Synthetic resins

Process of treating scrap or waste product containing solid...

521 495, 528 85, 528481, 528499, 525459, C08J 1114

Patent

active

059589884

ABSTRACT:
A cross-linked polyurethane resin powder includes a powder including particles made from a hard or a semi-hard polyurethane resin. The particles have a superficial portion and an internal portion disposed inside the superficial portion, and involve cross-linked bondings therein. Part of the cross-linked bondings are unchanged, and another part thereof are broken to result in activated groups. At least part of the activated groups are exposed on the superficial portion of the particles. The cross-linked polyurethane resin powder is produced by hydrolyzing a hard or semi-hard polyurethane resin in the presence of water and in a temperature range of from a hydrolysis temperature of the resin to a liquefying temperature thereof, and by applying a predetermined shearing force to the resin. The cross-linked polyurethane resin powder can disperse well in resinous substrates, and can upgrade the physical properties of the resulting recycled products.

REFERENCES:
patent: 3954681 (1976-05-01), Castle
patent: 4156768 (1979-05-01), Cook
patent: 5342884 (1994-08-01), Tabor
patent: 5539004 (1996-07-01), Ikeda

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