Plastic-metal junctions and methods of making the same
Various embodiments of the present invention relate to plastic-metal junctions and methods of making the same. In various embodiments, the present invention provides a method of forming a junction between a metal form and a solid plastic. The method can include contacting a metal including a plurality of pores and a flowable resin composition including a polybutylene terephthalate and a polyethylene terephthalate. The method can also include curing the flowable composition to form the solid plastic, to provide the junction between the metal and the solid plastic.
1. A method of forming a junction between a metal form and a solid plastic, the method comprising:
contacting a metal form comprising a plurality of pores and a flowable resin composition comprising a polyester; and
curing the flowable composition to form the solid plastic, to provide the junction between the metal form and the solid plastic;
wherein the flowable resin composition comprises at least two polyethylene terephthalate polymers having different viscosities in an amount of 40 to 99.9 weight percent and at least two polybutylene terephthalate polymers having different viscosities in an amount of 0.1 to 60 weight percent;
wherein weight percent is based on a total weight of the polyethylene terephthalate and the polybutylene terephthalate.
2. The method of claim 1 , wherein the pores are in a surface of the metal form, wherein the contacting comprises direct contacting between the metal form and the flowable resin composition.
3. The method of claim 1 , wherein the metal form comprises a porous adhesion film, and wherein the pores are in the porous adhesion film, wherein contacting the metal form and the flowable resin composition comprises contacting the flowable resin composition and the porous adhesion film on the metal form.
4. The method of claim 1 , further comprising heating the metal form to a temperature at or above a glass transition temperature of a flowable resin composition.
5. The method of claim 4 , wherein the heating comprises heating with steam, an electric heater, an induction heater, ultrasonic vibration, a laser heater, a halogen heater, a carbon heater, or a combination thereof.
6. The method of claim 4 , wherein the heating comprises heating a mold comprising the metal form, wherein the heating of the mold heats the metal form.
7. The method of claim 4 , wherein the heating comprises heating with a heating device that is inserted in a mold comprising the metal form or between cavities in the mold prior to the contacting of the metal form and the flowable resin composition.
8. The method of claim 4 , wherein the heating comprises directly heating the metal form.
9. The method of claim 1 , wherein the contacting the metal form and the flowable resin composition comprises injection molding the flowable resin composition.
10. The method of claim 1 , wherein the flowable resin composition further comprises a filler.
11. The method of any of the preceding claims, wherein the different viscosities are different by 0.01 to 1.5 dL/g, as measured at room temperature in a 60:40 phenol/tetrachloroethane mixture.
12. The method of any of the preceding claims, wherein each viscosity is 0.01 dL/g to 10 dL/g.
13. The method of any of the preceding claims, wherein contacting the metal form and the flowable resin comprises penetrating the pores with the flowable resin composition before the curing.