Henkel Ag & Company, Kgaa

Henkel IP Holding Gmbh

Stephen Hynes

Jiangbo Ouyang

Shengqian Kong

Wenhua Zhang

Chunyu Sun

John Gregory Woods

Bahram Issari

Yayun Liu

Xiaoyan Huang

Xiao Allison Yue

Xiao Alison Yue

Dual-cure compositions for use in high temperature adhesive applications, and particularly for temporarily adhesively attaching one substrate to another substrate, are provided. These dual-cure adhesives are silicone-based compositions that can be B-staged by exposure UV radiation to provide initial green strength, followed by a C-stage cure to give adhesives that can survive high temperature processes above 200° C., especially above 300° C., yet easy to debond afterwards to allow separation of the top and bottom substrates.

Debondable compositions

The present invention relates to one-component UV and thermal curable temporary adhesives for use in high temperature applications, and particularly to adhesives for the temporary attachment of one substrate to another substrate, the adhesives comprising (i) the partial hydrosilylation reaction product of the reaction between the vinyl groups on 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane and the terminal Si&#x2014;H hydrogens on a silane or siloxane having terminal Si&#x2014;H hydrogens, and (ii) a photo and/or thermal radical cure initiator. Also encompassed are assemblies including such an adhesive and methods of using the adhesives.

1K UV and thermal cure high temperature debondable adhesive

A debondable adhesive composition comprising (A) the hydrosilation reaction product of the reaction between the vinyl groups on 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane and the terminal Si&#x2014;H hydrogens on a silane or siloxane having terminal Si&#x2014;H hydrogens, (B) a cross-linker for the hydrosilation reaction product, and (C) a metal catalyst and/or a radical initiator is provided.

High temperature debondable adhesive

The present invention relates to a process for producing 2-cyanoacetic acid anhydride, comprising the steps of a) preparing a reaction mixture, containing as reactants 2-cyanoacetic acid, and at least one Ccarboxylic acid anhydride in at least one organic solvent, wherein the molar ratio of 2-cyanoacetic acid to Ccarboxylic acid anhydride in said reaction mixture is greater than 1.5:1, and b) subjecting the reaction mixture to a temperature of 0&#xb0; C. to 100&#xb0; C. to form 2-cyanoacetic acid anhydride. The present invention also relates to process for producing 2-cyanoacetic acid esters, 2-cyanoacetic acid amides and/or 2-cyanoacetic acid thioesters from 2-cyanoacetic acid anhydride.

Method for producing 2-cyanoacetic acid anhydride and further reaction products thereof

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Dublin, Ireland

Stephen Hynes