Polyolefinic Materials for Plastic Composites
First Claim
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 (A) and a second thermoplastic material (B), wherein the second thermoplastic material (B) comprises an polypropylene homopolymer;
b) stretching the elongated member;
c) 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; and
d) at least partially consolidating the intermediate form;
characterized in that the polypropylene homopolymer is isotactic and has a peak melting temperature greater than 160°
C. and a crystallinity of at least 30%, both as measured by differential scanning calorimetry, the elongated member is a coextruded structure wherein the second thermoplastic material (B) is located within an interior portion of the elongated member, and the at least partially consolidating step includes heating to a temperature to melt at least a portion of the first thermoplastic material (A), and the elongated member further includes a non-migratory process aid or surface modifier agent.
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Accused Products
Abstract
A reinforced composite article and method for making the same. The article and method employ at least one elongated member as a reinforcement phase. Specific elongated members are multiple layer structures wherein the layers are each polyolefinic (e.g., at least one of the layers may be a propylene-based polymer, such as a propylene-ethylene copolymer, an isotactic polypropylene homopolymer, or a combination thereof). Optionally, at least one of the layers may include a non-migratory process aid or surface modifier agent. An intermediate form including the elongated member may made and processed (for example, with a step of consolidation) to form a composite article.
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Citations
21 Claims
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1. A method for making a shaped composite article, comprising the steps of:
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a) providing at least one elongated member of a first thermoplastic material (A) and a second thermoplastic material (B), wherein the second thermoplastic material (B) comprises an polypropylene homopolymer; b) stretching the elongated member; c) 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; and d) at least partially consolidating the intermediate form;
characterized in that the polypropylene homopolymer is isotactic and has a peak melting temperature greater than 160°
C. and a crystallinity of at least 30%, both as measured by differential scanning calorimetry, the elongated member is a coextruded structure wherein the second thermoplastic material (B) is located within an interior portion of the elongated member, and the at least partially consolidating step includes heating to a temperature to melt at least a portion of the first thermoplastic material (A), and the elongated member further includes a non-migratory process aid or surface modifier agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21-41. -41. (canceled)
Specification