group assisted C–H activation with maleimides leading to novel and switchable decarboxylative Heck-type and [4 + 1] annulation products catalyzed by Rh(III) has been reported. In these reactions, solvents play a vital role in switching the selectivity. An aprotic solvent, THF, leads to the decarboxylative Heck-type product while the protic solvent, TFE, results in the [4 + 1] annulation product. The
Package encapsulant compositions for use in electronic devices
申请人:——
公开号:US20010056162A1
公开(公告)日:2001-12-27
A curable composition for encapsulating an electronic component comprises one or more mono- or polyfunctional maleimide compounds, or one or more mono- or polyfunctional vinyl compounds other than maleimide compounds, or a combination of maleimide and vinyl compounds, with a free radical curing agent, and optionally, one or more fillers.
Die attach adhesives for use in microelectronic devices
申请人:——
公开号:US20020007042A1
公开(公告)日:2002-01-17
A thermoplastic or thermosetting adhesive for bonding an electronic component to a substrate in which the adhesive is cured in situ from a curable composition comprises one or more poly- or mono-functional maleimide compounds, or one or more poly- or mono-functional vinyl compounds other than maleimide compounds, or a combination of maleimide and vinyl compounds, a curing initiator and optionally, one or more fillers.
A method for the production of maleimides, which comprises subjecting maleinamic acids to ring-closure imidation in an organic solvent capable of forming an azeotrope with water in the presence of an acid catalyst at a temperature in the range of 120° to 250°C while removing the formed water in the form of an azeotrope with said organic solvent and thereafter purifying the produced maleimides.
The present invention relates to resin compositions adapted for weather, heat and light resistance, and which are also resistant to discolouration, comprising at least one polymeric substance and:
(A) a hindered amine stabiliser;
(B) a hindered-phenol-hindered amine stabiliser; and
(C) a UV absorber,
in amounts sufficient to confer resistance to discolouration on the composition.