Process for making a foam from a composition comprising bituminous masses,a novolac,and hexamethylenetetramine
Abstract
Abstract FOAM MATERIALS OF CELLULAR STRUCTURE ARE PREPARED FROM MIXTURES OF BITUMINUM MATERIALS WITH NOVOLAK BY EXPANDING AND HARDENING SAID MIXTURES IN MOLTEN CONDITION BY CROSSLINKING AND PROPELLING. THE MOLTEN MIXTURE IS PREFERABLY EXPANDED AND HARDENED BY THE INCROPORATION THEREIN OF HEXAMETHYLENETERAMINE WHICH ACTS AS A CROSSLINKING AS WELL AS HARDENING AND PROPELLING AGENT. THE RESULTING INEXPENSIVE MATERIALS OF CELLULAR STRUCTURE HAVE SATISFACTORY ISOLATING CHARACTERISTICS, GOOD MECHANICAL RESISTIVITY, HIGH RESISTANCE TO TEMPERATURE CHANGES, CONSIDERABLE CHEMICAL SABILITY AND ARE NOT INFLAMMABLE. THE FOAMING AND HEARDENING PROCESS ACCORDING TO THE INVENTION CAN BE FAVORABLY INFLUENCED BY SUBJECTING THE MOLTEN MIXTURE OF BITUMINOUS MATERIALS AND NOVOLAK TO A SHORT PRETREATMENT CONSISTING OF ADDING THERETO A SMALL AMOUNT OF HEXAMETHYLENETETRAMINE AT ABOUT 150*160*C.
Inventors
- 👤 H Franck
- 👤 W Metzendorf
- 👤 E Schweym
- 👤 J Nijssen
- 👤 J Omran
- 👤 H Beneke
- 👤 R Marrett
Bibliographic Details
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