专利名称：AQUEOUS FORMALDEHYDE-UREA
冷笑话吧SOLUTION
发明人：ITO HIDEO,NISHIYAMA YOSHIO,ISHII TATSUO人体油画艺术
申请号：JP30381789
腰粗申请日：19891122
血管瘤是怎么形成的怎么写对联公开号：JPH03163124A
烤肉腌料配方
公开日：
19910715
没在石棱中上一句专利内容由知识产权出版社提供
如何加入九三学社摘要：PURPOSE:To prepare the title soln. which can be stored at room temp. and enables the production of an amino resin without requiring concentration by precondensing a high-concn. formalin with urea and compounding aq. soln. of the precondensate with polyvinyl formal. CONSTITUTION:One mol of urea is mixed into 6-16mol of formalin contg. 50-55wt.% formaldehyde and 3wt.% or lower methanol. The pH of the resulting soln. is adjusted to 8-9, and then the soln. is stirred at 65-75 deg.C for 15-60min to give an aq. soln. of the precondensate, which is compounded with 5-30ppm polyvinyl formal having a number-averages mol.wt. of 1500-5000 and a degree of formalization of 65-75mol% to give the title soln. having a viscosity of 5-10cP and a free formaldehyde content of 20-40wt.%. The soln. can be stored at room temp. and enables the production of an amino resin without requiring concentration.
申请人：NIPPON KASEI KK
更多信息请下载全文后查看
