Plastic composite articles and methods of making same
View Patent ↗A reinforced composite article and method for making the same. The article and method employ at least one elongated plastic member as a reinforcement phase. An intermediate form including the elongated member is made and can be processed, for example, to form a composite article with a smooth exposed reinforcement surface.
1. A method for making a shaped composite article, comprising the steps of:
a. providing at least one elongated member of a first thermoplastic material and having a surface portion capable of melting prior to the melting of an adjoining or internal portion; and
b. processing the elongated member into an intermediate form that includes a plurality of repeating structural units that are generally free to move relative to each other, wherein the form is capable of being processed to form a shaped composite article including an exposed portions, and that is ruck-free over the exposed portions of the form in the resulting composite article and has a relatively high degree of retained orientation in the unit; wherein the at least one elongated member further comprises a non-migratory process aid agent in an amount less than about 10% by weight of the material of the elongated member;
wherein the step of processing the elongated member into an intermediate form includes a step of disposing one of the repeating structural units relative to another; and
wherein the plurality of repeating structural units are capable of being arranged to define a pattern; and
wherein the first thermoplastic material is coextruded to include a layer that includes a propylene-ethylene copolymer and an adjoining layer that includes an isotactic polypropylene homopolymer.
2. The method of claim 1 , wherein the processing step (b) includes at least one processing step selected from thermoforming, vacuum forming, pressure forming, compression molding, blow molding, injection molding, rotational molding, hot pressing, laminating, extrusion blow molding, profile extruding or any combination thereof.
3. The method of claim 1 , wherein the processing step (b) includes an injection molding step.
4. The method of claim 3 , wherein the agent includes a silicone, a polyolefin, a halogenated polymer, or any combination thereof.
5. The method of claim 4 , wherein the agent comprises a high molecular weight silicone.
6. The method of claim 1 , wherein the structural units are warps, wefts, or windings.