Patent GB-983364-A (GB)
Title: Priming compositions for bonding silicone rubbers
IPC: B05D7/26
Filed: 1961-05-23
Abstract: A priming composition for bonding a silicone rubber to a substrate comprises at least one liquid silicon compound of the general formula RnSi(OR1)4-n, where R is a monovalent hydrocarbon or halo-hydrocarbon radical, R1 is an alkyl or halo-alkyl radical, and n is 0, 1 or 2, and/or at least one liquid partial hydrolysate thereof, and at least 1% by weight of a chelate-forming compound selected from b-diketones, keto-acid esters, nitrophenols, dioximes and keto alcohols.  The silicon compound may be an alkyl silicate, alkyl polysilicate, alkyl trialkoxysilane, aryl trialkoxysilane, dialkyl dialkoxysilane, hexaethoxy-disiloxane triphenyl penta-ethoxy trisiloxane, octabutoxy trisiloxane or 1-phenyl-2,2-vinyl methyl triethoxydisiloxane. In examples: (1) a mixture of tetramethyl diethoxydisiloxane and triphenyl pentaethoxy trisiloxane with acetyl acetone or diacetone alcohol; (2) a mixture of Ph(EtO)2SiOSi(OEt)MeVi (Vi is the group CH2=CH-) and hexa-methoxydisiloxane with picric acid; (3) the silicon compounds of (2) plus acetylacetone, 2,4-heptane-dione, diphenyl glyoximes, methyl phenyl glyoxine, an alkyl acetoacetate, 2,6-dinitrophenol, benzoin, acetoin or 1-cyclohexyl-1,3-butane dione; (4) any of ethysilicate, ethyl polysilicate, methyl triethoxy silane, trimethyl trimethoxy diethoxy trisiloxane or dimethyl diethoxy silane and the chelating agents of Example (1), (5) (EtO)3SiO[(EtO)2SiO]2Si(OEt)3 plus acetyl acetone, acetoacetic ester, diacetone alcohol or picric acid are used to coat various surfaces prior to attaching silicone rubbers.ALSO:A priming composition for bonding a silicone rubber to a substrate comprises at least one liquid silicon compound of the general formula RnSi(OR1)4- n where R is a monovalent hydrocarbon (saturated or unsaturated) or halohydrocarbon radical, R1 is an alkyl or haloalkyl radical, and n is 0, 1 or 2, and/or at least one liquid partial hydrosylate thereof, and at least 1% by weight of a chelate-forming compound selected from b -diketones, keto-acid esters, nitrophenols, dioximes and keto alcohols. The silicon compound may be an alkyl silicate, alkyl polysilicate, alkyl trialkoxysilane, aryl trialkoxysilane, dialkyl dialkoxy silane, hexaethoxy-disiloxane, triphenyl penta-ethoxy trisiloxane, octabutoxy trisiloxane or 1-phenyl-2,2-vinyl methyl triethoxydisiloxane.  In examples: (1) a mixture of tetramethyl diethoxydisiloxane and triphenyl pentaethoxy trisiloxane with acetyl acetone or diacetone alcohol; (2) a mixture of Ph(EtO)2 SiOSi(OEt) MeVi (Vi is the group CH2 = CH-) and hexamethoxydisiloxane with picric acid; (3) the silicon compounds of (2) plus acetylacetone, 2,4-heptane-dione, diphenyl glyoxime, methyl phenyl glyoxime, an alkyl acetoacetate, 2,6-dinitro phenol, benzoin, acetoin or 1-cyclohexyl-1,3-butane dione; (4) any of ethylsilicate, ethyl polysilicate, methyl triethoxy silane, trimethyl trimethoxy diethoxy trisiloxane or dimethyl diethoxy silane and the chelating agents of Example (1); (5) (EtO)3 SiO [(EtO)2 SiO]2 Si(OEt)3 plus acetyl acetone, acetoacetic ester, diacetone alcohol or picric acid are used to coat surfaces of glass, iron, steel, copper, brass, aluminium, wood, paper, and plastics prior to attaching silicone rubbers.ALSO:A priming composition for bonding a silicone rubber to a substrate comprises at least one liquid silicon compound of the general formula RnSi(OR1)4-n where R is a monovalent hydrocarbon or halo-hydrocarbon radical, R1 is an alkyl or halo-alkyl radical, and n is 0, 1 or 2, and/or at least one liquid partial hydrolysate thereof, and at least 1% by weight of a chelate-forming compound selected from B-diketones, keto-acid esters, nitrophenols, dioximes and keto alcohols.  The silicon compound may be an alkyl silicate, alkyl polysilicate, alkyl trialkoxysilane, aryl trialkoxysilane, dialkyl dialkoxy silane, hexaethoxy-disiloxane, triphenyl penta-ethoxy trisiloxane, octabutoxy trisiloxane or 1-phenyl-2,-vinyl methyl triethoxydisiloxane.  Drying accelerators, e.g. a chloride of Fe, Al, Zn, Ti, Za or Si, HCl, (CH3)2SiCl2, dimethyltetrachlorodisiloxane or the corresponding fluorides, bromides, nitrates, sulphates or acetates, may also be added.  In examples, (1) a mixture of tetramethyl diethoxydisiloxane and triphenyl pentaethoxy trisiloxane with acetyl acetone or diacetone alcohol, (2) a mixture of Ph(EtO)2 SiOSi(OEt)MeVi (Vi is the group CH2=CH-) and hexamethoxydisiloxane with picric acid, (3) the silicon compounds of (2) plus acetylacetone, 2,4-heptane-dione, diphenyl glyoxime, methyl phenyl glyoxime, an alkyl acetoacetate, 2,6-dinitro phenol, benzoin, acetoin or 1-cyclohexyl-1,3-butane dione, (4) any of ethylsilicate, ethyl polysilicate, methyl triethoxy silane, trimethyl trimethoxy diethoxy tri-siloxane or dimethyl diethoxy silane and the chelating agents of Example (1), (5) (EtO)3 SiO [(EtO)2 SiO]2 Si(OEt)3 plus acetyl acetone, acetoacetic ester, diacetone alcohol or picric acid are used to coat surfaces of glass, iron, steel, copper, brass, aluminium, wood, paper, and plastics prior to attaching silicone rubbers.