Random copolymers of methyl methacrylate and N-octadecyl methacrylate
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsHenry Gisser, Seymour Portnoy
Life of this patent
Estimating the term…
Abstract
Random copolymers are formed by reacting methyl methacrylate and n-octadecyl methacrylate (normal octadecyl methacrylate) at about 75.degree.-80.degree. C in the presence of catalytic amounts of benzoyl peroxide. The mole percentage of the monomer units containing the octadecyl group in the copolymers ranges from 7-21%, the mole percentage of the monomer units originating from methyl methacrylate ranging from 79-93%. The copolymers are useful as moldable lubricants which possess admirable toughness, low friction and low wear.
Claims3
Random copolymers useful as a clad film or solid members such as gears, bearings, and the like, comprising the reaction products of the free radical bulk polymerization of n-octadecyl methacrylate and methyl methacrylate, said copolymers having a number average molecular weight ranging from about 7,000 to about 20,100, the mole percentage of the monomer units containing the octadecyl group in said copolymers ranging from about 7% to about 21%, the mole percentage of the monomer units in said copolymers originating from methyl methacrylate ranging from about 79% to about 93%, and said copolymers having coefficients of friction in the range between 0.35 and 0.19 when molded into disks under 3000 psi.
Dependencies are inferred from the claim text.