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US 8,742,007 B2Granted
Color developing colorless primer
AssigneeOatey Co.
InventorRobert J. Duff
Life of this patent
Estimating the term…
Abstract
The intense purple dye normally found in purple primers for use in the adhesive bonding of plastics is replaced with a leuco dye capable developing a visually intense color when activated through contact with the particular plastic being bonded or a complementary solvent cement.
Claims12
A primer/solvent cement system for use in bonding a plastic object to another object, the system comprising
- an essentially colorless primer containing a first organic solvent capable of at least partially softening the surfaces of the plastic object to be bonded, and
- a solvent cement comprising a second organic solvent and a thermoplastic resin dissolved in the second organic solvent,
- one of the primer and solvent cement further comprising an essentially colorless color-forming chemical, the other of the primer and the solvent cement further comprising a developer for the color-forming chemical, the color-forming chemical and developer being selected and present in sufficient concentration so that when the solvent cement is applied to a surface previously covered with the primer, the color-forming chemical and the developer combine to develop a visually noticeable color thereby identifying the surfaces of the object to which the primer has been applied.
A primer/solvent cement system for use in bonding a plastic object to another object, the system comprising
- an essentially colorless primer containing a first organic solvent capable of at least partially softening the surfaces of the plastic object to be bonded, and
- a solvent cement comprising a second organic solvent and a thermoplastic resin dissolved in the second organic solvent,
- one of the primer and solvent cement further comprising an essentially colorless color-forming chemical and a blocked developer capable of causing the color-forming chemical to develop a visually noticeable color when the blocked developer is unblocked, the other of the primer and the solvent cement further comprising an activator capable of unblocking the blocked developer, the color-forming chemical, blocked developer and activator being selected and present in sufficient concentrations so that when the solvent cement is applied to a surface previously covered with the primer, the color-forming chemical, blocked developer and activator combine to develop a visually noticeable color thereby identifying the surfaces of the object to which the primer has been applied.
Dependencies are inferred from the claim text.