Polymerisation initiators, polymerisable compositions, and uses thereof for bonding low surface energy substrates
申请人:LOCTITE (R&D) LIMITED
公开号:US20030226472A1
公开(公告)日:2003-12-11
Quaternary boron salts are used as initiators of polymerisation in adhesive compositions for bonding low surface energy substrates such as polyolefins. The quaternary boron salts are of the formula I
1
wherein R
1
is C
1
-C
10
alkyl,
R
2
, R
3
and R
4
, which may be the same or different, are, C
1
-C
10
alkyl or C
3
-C
10
cycloalkyl, phenyl, or phenyl-substituted C
1
-C
10
alkyl or C
3
-C
10
cycloalkyl, provided that any two of R
1
-R
4
may optionally be part of a carbocyclic ring, and M
+
is a metal ion or a quaternary ammonium ion.
When M
+
is a quaternary ammonium ion, the initiator may be used in a two-part composition having a (meth)acrylate monomer in both parts and the initiator compound in one part, the two parts being in a weight ratio of about 1:1.
Particular examples of initiator compounds include sodium tetraethyl borate, lithium tetraethyl borate, lithium phenyl triethyl borate, tetramethylammonium phenyl triethyl borate, and tetra methyl ammonium phenyl tri-n-butyl borate, the last-mentioned of which is a novel compound.
季硼酸盐可用作粘合剂组合物中的聚合引发剂,用于粘合聚烯烃等低表面能基材。季硼酸盐的化学式为 I
1
其中 R
1
是 C
1
-C
10
烷基、
R
2
, R
3
和 R
4
可以相同或不同,它们是 C
1
-C
10
烷基或 C
3
-C
10
环烷基、苯基或苯基取代的 C
1
-C
10
烷基或 C
3
-C
10
环烷基,条件是 R
1
-R
4
可选择成为碳环的一部分,以及 M
为金属离子或季铵盐离子;
是金属离子或季铵盐离子。
当 M
是季铵离子时
为季铵盐离子时,引发剂可用于两部分组成的组合物中,其中两部分为(甲基)丙烯酸酯单体,一部分为引发剂化合物,两部分的重量比约为 1:1。
引发剂化合物的具体例子包括四乙基硼酸钠、四乙基硼酸锂、苯基三乙基硼酸锂、苯基三乙基硼酸四甲基铵和苯基三正丁基硼酸四甲基铵,其中最后提到的苯基三正丁基硼酸四甲基铵是一种新型化合物。