申请人:Loctite (R & D) Limited
公开号:EP1201722A1
公开(公告)日:2002-05-02
Metal alkyl borohydrides are used as initiators of polymerisation, particularly in adhesive compositions for bonding a wide range of substrates including low surface energy substrates such as polyolefins. As described, the metal alkyl borohydrides are of the formula I
wherein
R1 is C1 - C10 alkyl,
R2, R3 and R4, which may be the same or different, are H, D, C1 - C10 alkyl or C1 - C10 cycloalkyl, phenyl, or phenyl-substituted C1 - C10 alkyl or C1 - C10 cycloalkyl, provided that any two of R1 - R4 may optionally be part of a carbocyclic ring, and
M+ is a metal ion.
In particular, alkali metal trialkyl borohydrides are used, the alkali metal salt being selected from the group consisting of: Lithium triethylborohydride, Sodium triethylborohydride, Potassium triethylborohydride, Lithium tri-sec-butylborohydride, Sodium tri-sec-butylborohydride, Potassium tri-sec-butylborohydride, Lithium 9-borabicyclo [3.3.1]-nonane (9BBN) hydride, Lithium thexylborohydride, Lithium trisiamylborohydride, Potassium trisiamylborohydride and Lithium triethylborodeuteride.
A polymerisable composition, particularly a two part adhesive composition. comprises:
a) a free-radically polymerisable monomer component, and
b) an effective amount of an initiator system for initiating polymerisation of the free-radically polymerisable monomer, said initiator system comprising a metal alkyl borohydride.
金属烷基硼氢化物可用作聚合引发剂,特别是用于粘合各种基材(包括聚烯烃等低表面能基材)的粘合剂组合物中。如上所述,金属烷基硼氢化物的式子为 I
式中
R1 是 C1 - C10 烷基、
R2、R3 和 R4(可以相同或不同)是 H、D、C1 - C10 烷基或 C1 - C10 环烷基、苯基或苯基取代的 C1 - C10 烷基或 C1 - C10 环烷基,条件是 R1 - R4 中的任意两个可以任选地是碳环的一部分,以及
M+ 是金属离子。
尤其可使用碱金属三烷基硼氢化物,碱金属盐可选自以下组成的组:三乙基硼氢化锂、三乙基硼氢化钠、三乙基硼氢化钾、三仲丁基硼氢化锂、三仲丁基硼氢化钠、三仲丁基硼氢化钾、9-硼杂双环[3.3.1]-壬烷(9BBN)氢化物、正庚基硼氢化锂、三仲丁基硼氢化锂、三仲丁基硼氢化钾和三乙基硼氘化锂。
一种可聚合的组合物,特别是一种双组分粘合剂组合物:
a) 可自由基聚合的单体成分,和
b) 有效量的引发剂体系,用于引发可自由基聚合的单体的聚合,所述引发剂体系 包括金属烷基硼氢化物。