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US 7,731,880 B2Granted
Cellulosic-thermoplastic composite and method of making the same
AssigneeChemtura Corporation
InventorsWilliam D. Sigworth, Robert G. Rowland, Mark Richardson
Life of this patent
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Abstract
Provided is a composition comprising fatty acid bis-amide, inorganic particulate such as pumice, cellulosic particulate, thermoplastic and maleic anhydride grafted polyolefin. The combination of an ethylene bis-amide and a minor amount of pumice produces cellulosic-thermoplastic composite that has superior extrusion properties over conventional metal stearate/ethylene bis-stearamide (EBS) compositions such as improved flex strength and resistance to water absorption.
Claims5
A method for forming a composition comprising:
- (i) combining
- (a) from about 1 to about 8 weight percent of a fatty acid bis-amide of the structure:
- where R1 and R2 are independently saturated or unsaturated linear hydrocarbyl groups containing from 11 to 35 carbon atoms,
- (b) from about 0.25 to 0.75 weight percent of an inorganic particulate that is finely powdered pumice having a particle size of 50 μm or less,
- (c) from about 10 to about 90 weight percent of a cellulosic particulate from about 1 mm to about 100 μm in length,
- (d) from about 90 to about 10 weight percent of a thermoplastic;
- and,
- (e) from about 0.2 to about 10 weight percent of a coupling agent for coupling cellulosic particulate (c) to thermoplastic (d);
- and,
- (ii) extruding the composition through an extruder to provide cellulosic-thermoplastic composite,
- wherein no lubricants comprising zinc stearate are combined with components (a)-(e).
8 more elements
Dependencies are inferred from the claim text.