Injection molded parts having a scratch resistant surface are produced by applying a liquid mixture of at least one monomer susceptible of free radical polymerization and having more than one polymerizable double bond and of at least one free radical forming initiator to the forming surface of an injection mold, polymerizing the mixture at least partially, and then injecting a thermoplastic or duroplastic molding composition into the closed mold.

Claims

15 · 1 independent · depth 4

15 granted claims

›1.independentA method for making a molded synthetic resin article having a scratch resistant coating thereon, which method comprises the following steps: (a) heati…+14

›2.↳ 1A method as in claim 1 wherein the material for formation of the scratch resistant coating is applied to the forming surface of the mold when said sur…d2

›3.↳ 1A method as in claim 1 wherein said material contains a volatile organic solvent.d2+3

›7.↳ 1A method as in claim 1 wherein a compound having more than one acryloyl group is used as said monomer having more than one polymerizable double bond.d2+2

›10.↳ 1A method as in claim 1 wherein polymerizable monomers having a boiling point above 140.degree. C. are used.d2+1

›11.↳ 1A method as in claim 1 wherein a free radical forming initiator having a half-life of less than two minutes at 100.degree. C. is used.d2

›13.↳ 1A method as in claim 1 wherein said thermoplastic molding composition is injected into the closed injection mold at a temperature between 230.degree. …d2

›14.↳ 1A method as in claim 1 wherein the material susceptible of free radical polymerization applied to the injection mold is exposed to the action of atmos…d2

›15.↳ 1A method as in claim 1 wherein said thermoplastic molding composition is injected into the injection mold 1 to 20 seconds after said material comprisi…d2

Classifications

3 codes

USPC · US Patent Classification

264/255264/328.2264/83

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Jan H. Silbaugh

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