Reaction of isothiourea with 2,3-diaza-3-pentenedioic anhydride. A solid-phase synthesis of 3-amino-1,2,4-triazin-5(4H)-ones
摘要:
The first reported solid-phase synthesis of 3-amino-1,2,4-triazin-5(4H)-ones is described. Reactions of polymer-bound isothiourea with 2,3-diaza-3-pentenedioic anhydride forms 3-amino-1,2,4-triazin-5(4H)-ones in good yields and high purity. (C) 2001 Elsevier Science Ltd. All rights reserved.
Foamable polycarbonate compositions, articles and methods
申请人:GENERAL ELECTRIC COMPANY
公开号:EP0158266A2
公开(公告)日:1985-10-16
A foamable thermoplastic composition comprising in admixture (a) a polycarbonate resin, alone, or with (b) a polyester, (c) a minor amount of a foaming agent and (d) a minor amount of an inorganic non-fibrous particulate nucleating agent, alone, or with a particulate organic polymeric material, wherein (d) has an aspect ratio of about 1 and a small particle size.
A foamable composition comprises in admixture (a) a high molecular weight thermoplastic resin in particulate form and an effective amount of (b) a foaming agent therefor comprising a pumpable liquid dispersion comprising (i) a solid blowing agent, (ii) a liquid carrier, and, optionally, (iii) a thickener. The liquid dispersion can be pumped directly into the hopper of a foam molding machine eliminating the need to pre-mix pelletized concentrates of the solid blowing agent.