Compounds of the general formula I′
in which
R
1
is H, C
1
-C
12
alkyl; C
5
-C
12
cycloalkyl; C
2
-C
18
alkyl which is interrupted by one or more O; SR
4
; OR
5
; or is a group of formula II or III
R
2
, R
21
and R
3
independently of one another, are H or —Y-T as defined in claim
1,
where T is a reactive group selected from OH, acryl- and methacryloxy and arylcarbonate groups, and further symbols are as defined in claim
1,
are effective as crosslinking agents for polymeric networks, especially as in flexographic printing plates, coatings, and plastic containers or films. Further provided is a method of protecting the content of a clear or lightly colored plastic container or film against the deleterious effects of ultraviolet radiation, which method comprises permanently and covalently bonding one or more UV absorbing moieties of a durable s-triazine UV absorber via condensation to a suitable polymer component.
                            通式为I′的化合物,其中R1为H、C1-C12烷基;C5-C12环烷基;被一个或多个O中断的C2-C18烷基;SR4;OR5;或为公式II或IIIR2、R21和R3独立的基团,为H或-Y-T,其中T为从OH、
丙烯酰基和甲基
丙烯酰氧基和芳基
碳酸酯基中选择的反应性基团,其它符号如权利要求1所定义的,作为聚合物网络的
交联剂,特别是作为柔性版印刷板、涂层和塑料容器或薄膜的
交联剂具有效果。此外,还提供了一种保护透明或浅色塑料容器或薄膜的内容物免受紫外线有害影响的方法,该方法通过缩合将一种耐久的s-三嗪
紫外线吸收剂的一个或多个UV吸收基团与适当的聚合物组分永久共价键合。