Stock material or miscellaneous articles – Composite – Of asbestos
Patent
1974-01-03
1976-06-29
Smith, Ronald H.
Stock material or miscellaneous articles
Composite
Of asbestos
428524, B32B 1902
Patent
active
039670430
ABSTRACT:
A method of preparing asbestos articles to exhibit dustproof effects in secondary processing without degradation of the inherent properties of the asbestos articles comprises the step of immersing the asbestos article in a treating agent comprising formaldehyde, a water-soluble organic compound capable of reacting with formaldehyde to form a water-insoluble compound under weakly alkaline conditions in an atmosphere maintained at a high temperature and a high humidity, a plasticizer, and a water-soluble macromolecular substance having film forming properties, and the steps of infusing the asbestos article with a weakly alkaline solution and first reacting the asbestos article in an atmosphere maintained at a high temperature and high humidity, and subsequently heat treating the resulting product to obtain the final product. The final product is impregnated in the interior substrate thereof by 0.5 to 10 wt.% of the water-insoluble compound, has a surface layer of 0.04 to 0.09 wt.% of a film of the water-soluble macromolecular substance, and has 1.5-30 wt.% of a polyhydric alcohol plasticizer.
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patent: 3660148 (1972-05-01), Heron
Nakamura Michio
Otouma Takashi
Lawrence Evan K.
Nippon Asbestos Company, Ltd.
Smith Ronald H.
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