Patent GB-1011126-A (GB)
Title: Compositions and processes for causing polyolefins to adhere to surfaces
IPC: C09D4/00
Filed: 1964-04-07
Abstract: An adhesive for causing a polyolefin to adhere to a surface comprises a composition in liquid form consisting essentially of a mixture of (1) a silane having the general formula <FORM:1011126/C4-C5/1> wherein R is a divalent hydrocarbon radical free from aliphatic unsaturation and containing at least 3 carbon atoms, Y is a hydrogen atom, an amino-substituted monovalent hydrocarbon radical free from aliphatic unsaturation or a monovalent hydrocarbon radical, R1 is an alkyl radical containing 1 to 4 carbon atoms or a -CH2CH2OH, -CH2CH2OCH3 or -CH2CH2OCH2CH3 radical, R11 is a monovalent hydrocarbon radical free from aliphatic unsaturation or a fluorinated monovalent hydrocarbon radical free from aliphatic unsaturation in which each of the fluorine atoms is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom, a is 0, 1 or 2, and the Y2N group is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom, and (2) sodium monomethyl-siliconate, drying the substrate and bonding the polyolefin to the substrate.  Numerous examples of suitable silanes are given.  When the compositions are liquid they may be applied directly to the substrate; whether solid or liquid they may be applied as solutions in organic solvents by wiping, brushing, or spraying. Water or mixtures of water and organic solvents may also be used.  The preferred polyolefine is polyethylene; the preferred substrate is regenerated cellulose sheet which has been coated with a copolymer of vinyl chloride and vinylidene chloride.  The polyolefine may be finally laminated to the substrate by heat and pressure. Other substrates mentioned are uncoated regenerated cellulose sheets, ethylene glycolterephthalate polyester sheets, aluminium foil, glassine paper, silicone treated parchment paper, cotton cloth, glass and ceramic tile. Other polyolefins mentioned include polystyrene, polypropylene, polyethylene-butylene co-polymers, polyisoprene and butadiene-styrene co-polymers.ALSO:Amino silanes for use in adhesive compositions have the general formula <FORM:1011126/C3/1> wherein R is a divalent hydrocarbon radical free from aliphatic unsaturation and containing at least 3 carbon atoms, Y is a hydrogen atom, an amino-substituted monovalent hydrocarbon radical free from aliphatic unsaturation or a monovalent hydrocarbon radical, R1 is an alkyl radical containing 1 to 4 carbon atoms or a -CH2CH2OH, -CH2CH2OCH3 or - CH2CH2OCH2CH3 radical, R11 is a monovalent hydrocarbon radical free from aliphatic unsaturation or a fluorinated monovalent hydrocarbon radical free from aliphatic unsaturation in which each of the fluorine atoms is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom, a is 0, 1 or 2, and the Y2N group is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom.  Many examples are given of specific radicals R1, R11 and Y and of suitable amino silanes including aminoalkylamino silanes.ALSO:A process for causing a polyolefin to adhere to a surface comprises applying to the substrate a composition in liquid form consisting essentially of a mixture of (1) a silane having the general formula <FORM:1011126/B1-B2/1> wherein R is a divalent hydrocarbon radical free from aliphatic unsaturation and containing at least 3 carbon atoms, Y is a hydrogen atom, an amino-substituted monovalent hydrocarbon radical free from aliphatic unsaturation or a monovalent hydrocarbon radical, R1 is an alkyl radical containing 1-4 carbon atoms or a -CH2CH2OH, -CH2CH2OCH3 or -CH2CH2OCH2CH3 radical, R11 is a monovalent hydrocarbon radical free from aliphatic unsaturation or a fluorinated monovalent hydrocarbon radical free from aliphatic unsaturation in which each of the fluorine atoms is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom, a is 0, 1 or 2, and the Y2N group is attached to a carbon atom which is at least three carbon atoms removed from the silicon atom, and (2) sodium monomethylsiliconate, drying the substrate and bonding the polyolefin to the substrate.  Numerous examples of suitable silanes are given. When the compositions are liquid they may be applied directly to the substrate; whether solid or liquid they may be applied as solutions in organic solvents by wiping, brushing, or spraying.  Solutions in water or in mixtures of water and organic solvents may also be used. The preferred polyolefine is polyethylene; the preferred substrate is regenerated cellulose sheet which has been coated with a copolymer of vinyl chloride and vinylidene chloride.  The polyolefine may be finally laminated to the substrate by heat and pressure.  Other substrates mentioned are uncoated regenerated cellulose sheets, ethylene glycol-terephthalate polyester sheets, aluminium foil, glassine paper, silicone-treated parchment paper, cotton cloth, glass and ceramic tile.  Other polyolefins mentioned include polystyrene, polypropylene, polyethylene-butylene copolymers, polyisoprene and butadiene-styrene copolymers.