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US 9,611,409 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.
Claims5
An essentially colorless primer for use in preparing a PVC or CPVC plastic object for bonding with a solvent cement, the primer comprising an organic solvent capable of at least partially softening the surfaces of the plastic object to which it is applied and an essentially colorless color-forming chemical in the organic solvent,
- the essentially colorless color-forming chemical being chemically activated by at least one of the plastic object to which it is applied, a component in or on the plastic, a developer included in a subsequently applied solvent cement, and is not activatable by heat,
- activation causing the essentially colorless color-forming chemical to develop a visually noticeable color thereby identifying the surfaces of the plastic object to which the primer has been applied,
- wherein the primer does not contain a developer that must be activated for use.
Dependencies are inferred from the claim text.