Advanced polymer wood composite
First Claim
Patent Images
1. A composite thermoplastic pellet, capable of formation into a structural member, which pellet consists essentially of a thermoplastic cylindrical extrudate having a width of about 1 to 5 mm, a length of about 1 to 10 mm;
- the thermoplastic pellet composition consisting essentially of;
(a) a continuous phase comprising a polyvinyl chloride homopolymner;
(b) an effective amount of wood fiber having a minimum thickness of 0.1 mm and a minimum aspect ratio of about 1.8 to provide structural properties to the structural member; and
(c) less than about 8 wt % water; and
wherein the polyvinyl chloride homopolymer and wood fiber are mixed at elevated temperature and pressure such that an intimate admixture is formed and tic wood fiber is dispersed throughout a continuous polyvinyl chloride homopolymer phase and the composite has a Young'"'"'s modulus of at least about 600,000 psi.
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Abstract
The invention relates to a composition or pellet comprising a polyvinyl chloride homopolymer and wood fiber composite that can be used in the form of a linear extrudate or thermoplastic pellet to manufacture structural members. The fiber in the pellet or extrudate is of a particular dimension that lends enhanced modulus to the composition or pellet formed. The extruded pellet comprises a consistent proportion of polymer, wood fiber and water.
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Citations
27 Claims
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1. A composite thermoplastic pellet, capable of formation into a structural member, which pellet consists essentially of a thermoplastic cylindrical extrudate having a width of about 1 to 5 mm, a length of about 1 to 10 mm;
- the thermoplastic pellet composition consisting essentially of;
(a) a continuous phase comprising a polyvinyl chloride homopolymner; (b) an effective amount of wood fiber having a minimum thickness of 0.1 mm and a minimum aspect ratio of about 1.8 to provide structural properties to the structural member; and (c) less than about 8 wt % water; and wherein the polyvinyl chloride homopolymer and wood fiber are mixed at elevated temperature and pressure such that an intimate admixture is formed and tic wood fiber is dispersed throughout a continuous polyvinyl chloride homopolymer phase and the composite has a Young'"'"'s modulus of at least about 600,000 psi. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- the thermoplastic pellet composition consisting essentially of;
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10. A polymer and wood fiber thermoplastic composite capable of formation into a structural member, which composite consists essentially of a thermoplastic cylindrical linear extrudate having a radius of about 1 to 5 mm;
- the linear thermoplastic extrudate composition consisting essentially of;
(a) a continuous phase comprising a polyvinyl chloride homopolymer; (b) an effective amount of wood fiber having a minimum thickness of 0.1 mm and an aspect ratio of about 1.8 to provide structural properties to a composite; (c) less than about 8 wt % water; and wherein the polyvinyl chloride homopolymer and wood fiber are mixed at elevated temperature and pressure such that an intimate admixture is formed and the wood fiber is dispersed throughout a continuous phase and the composite has a Young'"'"'s modulus of at least about 600,000 psi. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- the linear thermoplastic extrudate composition consisting essentially of;
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19. A thermoplastic composite composition, capable of extrusion into a dimensionally stable structural member, which consists essentially of a thermoplastic composition which comprises:
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(a) a continuous phase comprising a polyvinyl chloride homopolymer; (b) an effective amount of wood fiber having a minimum width of 0.1 mm and an aspect ratio of greater than about 1.8 to provide structural properties to the composite; (c) about 0.01 to 25 wt % of an intentionally recycled impurity comprising thermoplastic polymer, an adhesive, a paint, a thermoplastic resin or mixtures thereof; and (d) less than about 10 wt % water; wherein the polyvinyl chloride homopolymer and wood fiber are mixed at elevated temperature and pressure such that an intimate admixture is formed and the wood fiber is dispersed throughout the continuous thermoplastic polyvinyl chloride homopolymer phase and the composite has a Young'"'"'s modulus of at least about 600,000 psi. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification