The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1978
Filed:
Jan. 12, 1977
Gar Lok Woo, Tiburon, CA (US);
Chevron Research Company, San Francisco, CA (US);
Abstract
A process for making a sulfur foam containing at least 50 weight percent sulfur which comprises (a) contacting and reacting molten sulfur with a carboxylic acid which is reactive with the molten sulfur so as to incorporate the acid with the molten sulfur and form a molten sulfur-acid adduct containing carboxylic acid groups; (b) mixing the molten adduct with an alkali earth metal carbonate and a foam stabilizer such as talc or mica to obtain a mixture; and (c) reacting said mixture with phosphoric acid in the absence of any added phosphorus sulfide to obtain the foam. Preferably the molten sulfur is reacted with a plasticizer such as dicyclopentadiene before foaming with phosphoric acid.