Patent KR-20070078063-A (KR)
Title: Encapsulated michael addition catalyst
Inventor: BRINKMAN LARRY FRANK
IPC: B01J13/02
Filed: 2007-01-19
Abstract: A one-part curable composition comprising: (a) at least one Michael donor; (b) at least one Michael acceptor; and (c) one or more encapsulated catalysts having an average particle size of from 0.1 to 500 mum prepared in capsules to a portion or all of one-part curable adhesive composition, articles prepared from one-part composition selected from an adhesive, a sealant, a coating, an elastomer and a foam, and a method for preparing the one-part curable composition and a method for bonding at least two substrates using the one-part curable composition are provided. A one-part curable composition comprises: (a) at least one Michael donor selected from the group consisting of methyl acetoacetate, ethyl acetoacetate, n-propyl acetoacetate, isopropyl acetoacetate, n-butyl acetoacetate, t-butyl acetoacetate, ethylene glycol bisacetoacetate, 1,2-propanediol bisacetoacetate, 1,3-propanediol bisacetoacetate, 1,4-butanediol bisacetoacetate, neopentyl glycol bisacetoacetate, isosorbide bisacetoacetate, trimethylol propane tris acetoacetate, glycerol tris acetoacetate, castor oil tris acetoacetate, glucose tris acetoacetate, glucose tetraacetoacetate, sucrose acetoacetates, sorbitol tris acetoacetate, sorbitol tetra acetoacetate, acetoacetates of ethoxylated and propoxylated diols, triols and polyols, ethoxylated neopentyl glycol bisacetoacetate, propoxylated glucose acetoacetatates, propoxylated sorbitol acetoacetates, propoxylated sucrose acetoacetates, polyester acetoacetatates in which the polyester is derived from at least one di acid and at least one diol, polyesteramide acetoacetates in which the polyesteramide is derived from at least one di acid and at least one diamine, 1,2-ethylene bisacetamide, 1,4-butane bisacetamide, 1,6-hexane bisacetoacetamide, piperazine bisacetamide, acetamides of amine terminated polypropylene glycols, acetamides of polyesteramides acetoacetates in which the polyesteramide is derived from at least one di acid and at least one diamine, polyacrylates containing comonomers having acetoacetoxy functionality(such as derived from acetoacetoxyethyl methacrylate), and polyacrylates containing acetoacetoxy functionality and silylated comonomers(such as vinyl trimethoxysilane); (b) at least one Michael acceptor selected from compounds having at least one functional group with the structure (I) where R^1, R^2, and R^4 are, independently, hydrogen or organic radicals such as for example, alkyl(linear, branched, or cyclic), aryl, aryl-substituted alkyl(also called as aralkyl or arylalkyl), and alkyl-substituted aryl(also called as alkaryl or alkylaryl), including derivatives and substituted versions thereof, R^1, R^2, and R^4 independently contain or do not contain ether linkages, carboxyl groups, additional carbonyl groups, thio analogs thereof, nitrogen-containing groups, or combination groups thereof, and R^3 is oxygen, a nitrogen-containing group, or any of the organic radicals described about R^1, R^2, and R^4; and (c) one or more encapsulated catalysts selected from the group consisting of guanidines, amidines, hydroxides, alkoxides, oxides, tertiary amines, alkali metal carbonates, alkali metal bicarbonates, alkali metal phosphates, alkali metal hydrogen phosphates, phosphines, alkali metal salts of carboxylic acids, alkali silicates, tetra methyl guanidine(TMG), 1,8-diazabicyclo(5.4.0)unde-7-cene(DBU), 1,5-diazabicyclo(4.3.0)non-5-ene(DBN), 1,4-diazabicyclo(2.2.2)octane(DABCO), tertiary butyl ammonium hydroxide(TBAH), sodium hydroxide, potassium hydroxide, sodium methoxide, sodium ethoxide, tri potassium phosphate, calcium oxide, triethylamine, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, potassium hydrogen phosphate(mono-basic and di-basic), triphenyl phosphine, triethyl phosphine, sodium silicate, potassium acetate, potassium acrylate, and potassium octanoate, the one or more encapsulated catalysts having an average particle size of from 0.1 to 500 mum being prepared in capsules to a portion or all of one-part curable adhesive composition.