3634-83-1Relevant articles and documents
Process of preparing isocyanate compounds comprising non-chlorination derivatives and Composition thereof
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Paragraph 0149-0166, (2021/10/05)
The present invention relates to a process for producing xylylene diisocyanate. The present invention relates to a process for preparing isocyanates comprising the obtained non-chlorinated derivatives. In particular, the present invention relates to an isocyanate composition comprising an unchlorinated derivative obtained by the reduction reaction and a polymerizable composition including the same.
METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE
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Paragraph 0367; 0369-0379; 0399; 0402-0403, (2021/06/22)
The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below: (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and(2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.
METHOD OF PREPARING DIISOCYANATE COMPOSITION AND OPTICAL LENS
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Paragraph 0175-0179; 0195-0199; 0218-0221, (2021/06/11)
In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens of higher quality, in which the reaction temperature of a diamine hydrochloride composition and triphosgene is controlled to a specific range, or a crude diisocyanate composition obtained from the reaction of a diamine hydrochloride composition and triphosgene is distilled at a specific temperature range, or the molar ratio of a diamine hydrochloride and triphosgene is adjusted to a specific range.