초록 ▼

Thread locking compositions and analogous sealant materials having limited cured strength, and a preferred method for their compounding and application, are disclosed. These are based primarily on alpha cyanoacrylates, i.e. acrylate esters in monomer or low polymeric form, or of very low molecular w

Thread locking compositions and analogous sealant materials having limited cured strength, and a preferred method for their compounding and application, are disclosed. These are based primarily on alpha cyanoacrylates, i.e. acrylate esters in monomer or low polymeric form, or of very low molecular weight, which are rapidly polymerizable to form solid and bonding films. The materials, in liquid form, are modified by inclusion of coloring agents and other film strength and reaction rate modifiers, to impart optimum properties of bonding strength, curing rate, moderate resistance in torque to separation of the bonded parts, low residual torque, along with good stability in storage, or good shelf life. Combinations of polymerization promoters and stabilizers are included, along with small quantities of specially selected coloring agents which not only impart effective color to thin films of the composition but serve to limit curing below high cured strength. The coloring agents are compatible with the monomers and the resulting cured polymers. Application of the protective composition to plated or unplated metal parts, plastic members which bear threads or seal surfaces, and the like, may be by standard coating procedures or by capillary action.

대표청구항 ▼

A method of bonding threaded parts and analogous structures while sealing them from extraneous injurious substances which comprises adding to a rapidly polymerizable monomer of an alpha cyanoacrylate ester of general formula, [Figure] wherein R is a radical containing a total of 1 to 16 carbon atoms

A method of bonding threaded parts and analogous structures while sealing them from extraneous injurious substances which comprises adding to a rapidly polymerizable monomer of an alpha cyanoacrylate ester of general formula, [Figure] wherein R is a radical containing a total of 1 to 16 carbon atoms, said radical being selected from the group which consists of alkyl, alkenyl (with 2 to 6 carbon atoms), alkoxyalkyl (with 2 to 6 carbon atoms), cyclohexyl, and phenyl, a coloring agent in proportions of 100 to 5000 parts per million parts by weight of the monomer, selected from the group which consists of modified dyestuffs, red, blue or yellow in color, and mixtures thereof, having respectively the formulas, [Figure] (i) [Figure] (ii) [Figure] (iii) applying said monomer as a coating film to the surfaces to be joined and protected, contacting the coated surfaces, and polymerizing said monomer in situ to form a visibly colored bonding film on said surface while limiting the ultimate strength of said film by reason of strength modifying properties of said coloring agent, without retarding the rapid curing properties of the monomer.