Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-02-02
2000-07-04
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521142, 521143, C08J 900
Patent
active
060839996
ABSTRACT:
A process for preparing super lightweight sheet of the present invention comprises the steps of mixing a low density polyethylene (LDPE), a first blowing agent, a surface activation agent and a separation agent; heating the obtained mixture at a temperature higher than 160.degree. C. to obtain a molten mass; heating said molten mass at a temperature higher than the gasification temperature of said first blowing agent to separate said first blowing agent; cooling the obtained mixture; and forming the cooled mass in a sheet.
In a preferred embodiment, the process of the present invention process further comprises the steps of introducing a second gaseous blowing agent in the cooled mass to obtain a foamed mass; maintaining the foamed mass at a stabilizing temperature to stabilize the foamed mass; and cooling the foamed mass at 20-25.degree. C. and maintaining the cooled mass at said temperature for 24 hours.
REFERENCES:
patent: 4330495 (1982-05-01), Halle et al.
patent: 4360556 (1982-11-01), Heider
Elio Davide Cattan
Foelak Morton
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