Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-02-03
1978-09-12
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
528 29, 528 34, C08G 7700
Patent
active
041136659
ABSTRACT:
Chemically resistant coatings comprise a binder, the major portion of which is prepared by reacting, in the presence of an acidic solution, trialkoxysilanes with aliphatic polyols and/or silicone intermediates. The silanes have the formula ##STR1## where R.sub.1 is selected from the group consisting of alkyl, aryl and cycloalkyl groups containing up to about 6 carbon atoms and each R.sub.2 is independently selected from the group consisting of alkyl, hydroxyalkyl, alkoxyalkyl and hydroxyalkoxyalkyl groups containing up to about 6 carbon atoms. The aliphatic polyols contain an average of at least two carbon bonded hydroxyl groups per polyol. The silicone intermediates have the formula ##STR2## WHERE EACH R.sub.3 is selected from the group consisting of the hydroxy group and alkyl, aryl, and alkoxy groups having up to about 6 carbon atoms. Each R.sub.4 is selected from the group consisting of hydrogen and alkyl and aryl groups having up to about 6 carbon atoms. "n" is selected so that the average molecular weight of the silicone intermediates is from about 500 to about 2000.
In the binder, the weight ratio of silanes to polyols is greater than about 5:1 and the weight ratio of silane to silicones is greater than about 1:1. The weight ratio of silanes to polyols and silicones in combination is less than about 20:1.
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Gysegem Albert Peter
Law Gabriel H.
Ameron Inc.
Jacobs Lewis T.
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