Composition capable of radiation activated catalysis and radiation curable urethane containing the composition
View Patent ↗A composition capable of radiation activated catalysis is provided. The composition comprises a metal compound, a mercapto compound and an olefinic compound. Radiation curable urethane compositions comprising the disclosed composition are also provided. The radiation curable urethane compositions comprise the disclosed composition, a hydroxyl compound and an isocyanate compound. Activation of the composition by radiation in a urethane formulation provides for an efficient method of curing the urethane composition. Coating and adhesive compositions comprising the radiation curable urethane compositions are also provided. In addition, methods for coating and bonding substrates are disclosed.
1. A radiation activated catalyst consisting of:
(A) a metal compound having catalytic activity;
(B) a mercapto compound which passivates the metal compound by inhibiting the catalytic activity of the metal compound; and
(C) an olefinic compound which reacts with the mercapto compound wherein the reaction between the mercapto compound and the olefinic compound is caused by the radiation.
2. The catalyst as claimed in claim 1 , wherein the metal compound (A) is selected from the group consisting of a tin compound, a bismuth compound, a germanium compound, a cobalt compound, a manganese compound and mixtures thereof.
3. The catalyst as claimed in claim 1 , wherein the mercapto compound (B) is selected from the group consisting of trimethylol propane tri-(3-mercapto propionate), pentaerythritol tetra-(3-mercapto propionate), glycol di-(3-mercapto propionate), glycol dimercapto acetate, trimethylol propane trithioglycolate, mercapto diethyl ether, ethane dithiol, thiolactic acid, mercapto propionic acid and esters thereof, thiophenol, thio acetic acid, 2-mercapto ethanol, 1,4-butanedithiol, 2,3-dimercapto propanol, toluene-3,4-dithiol, alpha,alpha′-dimercapto toluene, allyl mercaptan, benzyl mercaptan, 1,6-hexane dithiol, 1-octane thiol, para-thiocresol, 2,3,5,6-tetrafluorothiophenol, cyclohexyl mercaptan, methylthioglycolate, various mercapto pyridines, dithioerythritol, 6-ethoxy-2-mercaptobenzothiazole, d-limonene dimercaptan, -mercapto silane and mixtures thereof.
4. The catalyst as claimed in claim 1 , wherein the olefinic compound (C) is selected from the group consisting of diallyl phthalate, acrylic acid, methacrylic acid, alkyl acrylate, alkyl methacrylate, acrylamide and mixtures thereof.
5. The catalyst as claimed in claim 1 , wherein the metal compound (A) is selected from the group consisting of dibutyltindilaurate, stannous acetate, stannic oxide, stannous octoate, dibutyltin dioctoate, tin mercaptides, stannous citrate, stannous oxylate, stannous chloride, stannic chloride, tetra-phenyl tin, tetra-butyl tin, tri-n-butyl tin, tri-n-butyl tin acetate, dialkyl tin dicarboxylates, dimethyl tin dichloride, bismuth tricarboxylates, bismuth nitrate, bismuth halides, bismuth sulfide, basic bismuth dicarboxylates, and mixtures thereof.
6. The catalyst capable of radiation activated catalysis as claimed in claim 1 , wherein the radiation is actinic radiation or e-beam radiation.
7. The catalyst capable of radiation activated catalysis as claimed in claim 1 , wherein the radiation is UV radiation.