Abstract:
A method for encapsulating microelectronic devices is provided using a heat curable epoxy composition having a monomeric or polymeric diaryliodonium hexafluoroantimonate salt. Curable compositions are also provided as well as encapsulated microelectronic devices.
Abstract:
Arylalkyliodonium salts are provided which can be used as thermal or photoinitiators for polymerization of a wide variety of cationically polymerizable organic materials. Reaction is effected between an aryliodonium tosylate and an active hydrogen aliphatic organic compound, such as dimedone, to produce an intermediate arylalkyliodonium tosylate salt which is thereafter reacted with a polyfluoro metal or metalloid salt of an alkali or alkaline earth metal to produce the desired arylalkyliodonium polyfluoro metal or metalloid salt, such as dimedonylphenyliodonium hexafluoroarsenate.
Abstract:
A method is provided for electroinitiating cationic polymerization on the surface of a metal substrate or a metallized nonconducting substrate. The conducting substrate is used as the anode in an electrolyzed bath of a cationically polymerizable organic material, and an effective amount of an arylonium salt, such as diphenyliodonium hexafluorophosphate. An organic solvent also can be used.
Abstract:
A method for making triarylsulfonium salts is provided based on the reaction of an aromatic hydrocarbon, a sulfur chloride, and chlorine in the presence of a Friedel Crafts catalyst. The triarylsulfonium salts can be used as cationic photoinitiators to effect the deep section cure of a variety of organic resin compositions.
Abstract:
Aromatic onium salts, such as diaryliodonium salts, have been found to be effective thermal initiators for the polymerization of epoxy resins having a viscosity of up to about 100,000 centipoises at 25.degree. C. when used in combination with copper salts. The processable epoxy resin composition can be used in filament winding and pultrusion applications.
Abstract:
UV curable mixtures of C.sub.(8-28) .alpha.-olefin oxides and certain onium salt photoinitiators, for example, certain diaryliodonium salts, or triarylsulfonium salts, and optionally polyfunctional epoxy resin, have been found useful in paper release coating applications.
Abstract:
Photocurable compositions are provided based on the use of particular triarylsulfonium salts as photoinitiators for certain oxirane containing aliphatically unsaturated organic resins, such as acrylics, or mixtures of vinyl aromatic and unsaturated polyesters. A simultaneous free-radical cure and cationic cure of the aforesaid organic resins are achieved, which provides improved results, such as metal coatings having improved solvent resistance.
Abstract:
Diaryliodonium salts have been found to be effective thermal initiators for the polymerization of a variety of cationically polymerizable materials including epoxides, cyclic ethers, phenol formaldehyde resins, etc., when used in combination with various cocatalysts. Among the cocatalysts which have been found to be effective are, for example, copper chelates and mixtures of such copper chelates with various reducing agents such as ascorbic acid, tin.sup.+2 salts, etc.
Abstract:
Curable organic resin compositions, such as epoxy resins, are provided, based on the use of a diaryliodonium salt-redox catalyst curing system. The curable compositions can provide flexible or rigid organic resin foam when used with a volatile organic solvent as a result of exothermic heat of cure.
Abstract:
Onium salts of Group VIa elements having an MF.sub.6 -anion, where M is selected from P, As and Sb, have been found to be photo active under ultraviolet light. These onium salts can be employed as cationic photoinitiators when used with a variety of organic resins and cyclic organic compounds.