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US 5,847,016 AGranted
Polymer and wood flour composite extrusion
AssigneeMarley Mouldings Inc.
InventorCarroll W. Cope
Life of this patent
Estimating the term…
Abstract
An extrusion profile is formed of foamed plastic, which includes a filler of wood flour or wood fiber. The foamed plastic may include polyvinyl chloride, chlorinated polyvinyl chloride or polystyrene in combination with the wood flour filler.
Claims7
An extrudable composite of foamable plastic consisting essentially of, in parts (volume):
- polymer resin:
- in an amount of up to 100
- wood flour:
- 15-140
- stabilizers:
- in an amount of up to 5
- lubricants:
- in an amount of up to 5
- process aids:
- in an amount of up to 10
- blowing agents:
- 0.2 to 5
- colorant:
- in an amount of up to 10,
- said wood flour being in particle form having size comprising, in parts (volume):
- ______________________________________ up to 10% about 425 microns, about 40%-75% about 250 microns, about 15%-50% about 180 microns, ______________________________________
- said wood flour particles being encapsulated within said polymer resin and formed into pellets prior to being combined with a mixture that includes polymer resin and said blowing agents.
14 more elements
Dependencies are inferred from the claim text.