The Formation of National Party Systems: Federalism and Party Competition in Canada
The Formation of National Party Systems: Federalism and Party Competition in Canada
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国家政党制度的形成：加拿大的联邦制与政党竞争
DOI：
10.1515/9781400826377
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Ken Kollman
中科院分区：
文献类型：
--
作者：
Pradeep K. Chhibber;Ken Kollman
提供了一种通过使多异氰酸酯、多羟基和/或多羧基化合物、阻燃剂以及如果需要的话，还可以反应发泡剂、乳化剂、活化剂和其他助剂来生产合成聚氨酯塑料，尤其是泡沫塑料的方法，其特征在于将大约1%到85%的含二缩脲基的多异氰酸酯用作单体多异氰酸酯中的多异氰酸酯溶液，并且具有下式：O平行OCN-R-N-C-R-NCO？O=C(CO-N-NH？H-N-CO)n-NCO？R-NCoR？NCO，其中R是芳香族，如果需要，可以被取代的芳族或环状脂肪族基团，N是0到5的整数，其中具有三个以上异氰酸酯基团的BIURET-多异氰酸酯的比例以BIURET-多异氰酸酯的总量为至少20%的重量，并且溶液包含大约0.03%到大约5%的化学结合乳化剂的重量。
A process is provided for the production of synthetic polyurethane plastics, particularly foam plastics, containing biuret groups by reacting polyisocyanates, polyhydroxyl and/or polycarboxyl compounds, flame inhibitors and, if desired, blowing agents, emulsifiers, activators and other additives which is characterized by using as the polyisocyanate solutions in monomeric polyisocyanates of from about 1 per cent to 85 per cent of polyisocyanates containing biuret groups and having the formula: O PARALLEL OCN-R-N-C-N-R-NCO ¦¦ O=C(CO-N--nH ¦¦ H--N-CO)n-NR-NCO ¦¦ R-NCOR ¦ NCO in which R is an aromatic, araliphatic or cycloaliphatic radical which may, if desired, be substituted and N IS AN INTEGER FROM 0 TO 5, WHEREIN THE PROPORTION OF BIURET-POLYISOCYANATES HAVING MORE THAN THREE ISOCYANATE GROUPS IS AT LEAST 20 PER CENT BY WEIGHT BASED ON THE TOTAL QUANTITY OF BIURET-POLYISOCYANATES, AND THE SOLUTIONS CONTAIN FROM ABOUT 0.03 PER CENT TO ABOUT 5 PER CENT BY WEIGHT OF CHEMICALLY COMBINED EMULSIFIERS.