Modified aminoplast crosslinkers and powder coating compositions containing such crosslinkers
申请人:——
公开号:US20020037973A1
公开(公告)日:2002-03-28
A crosslinking agent is provided, prepared by reacting (A) an aminoplast resin; (B) a reactive urethane group-containing adduct of a polyfunctional polymer and monoisocyanate, and (C) at least one other compound having active hydrogen groups reactive with aminoplast resin (A). Compound (C) is selected from:
(i) compounds having the structure (I):
1
wherein X is aromatic; R
1
, R
2
, and R
3
each independently represents H, (cyclo)alkyl having from 1 to 12 carbon atoms, aryl, alkaryl, aralkyl, or an active hydrogen-containing group,
(ii) compounds having the structure (II) or (III):
2
where R′ and R″ each independently represents an aromatic group or an alkyl group having 1 to 12 carbon atoms; and
(iii) compounds different from (i) and (ii), having a melting point of at least 80° C.
Further provided are methods for preparing the crosslinking agent, curable compositions containing the crosslinking agent, and coated substrates.
本发明提供了一种交联剂,其制备方法是:(A)氨基树脂;(B)多官能团聚合物和单异氰酸酯的含活性聚氨酯基的加合物;(C)至少一种具有与氨基树脂(A)反应的活性氢基的其他化合物。化合物(C)选自
(i) 具有结构 (I) 的化合物:
1
其中 X 为芳香族; R
1
, R
2
和 R
3
各自独立地代表 H、具有 1 至 12 个碳原子的(环)烷基、芳基、烷芳基、芳烷基或活性含氢基团、
(ii) 具有结构 (II) 或 (III) 的化合物:
2
其中 R′和 R″各自独立地代表芳香基团或具有 1 至 12 个碳原子的烷基;以及
(iii) 不同于(i)和(ii)的化合物,其熔点至少为 80℃。
进一步提供了制备交联剂的方法、含有交联剂的可固化组合物和涂覆基材。