Composite siding

Abstract

A composite siding comprising a binder and a wood-based filler. The composite siding is preferably produced by a pultrusion process and exhibits great dimensional stability, aging resistance to damage characteristics while maintaining high product stiffness and strength.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:  
     
         1 . A composite siding comprising a binder and the wood filler having a thermal coefficient of expansion along the length of 2×10 −6  to 9×10 −6  in./in./° F.  
     
     
         2 . The product of  claim 1 , wherein said coefficient of expansion along the length is 6×10 −6  to 8×10 −6  in./in./° F.  
     
     
         3 . The product of  claim 1 , having a linear expansion along the width thereof of 0.005 to 0.015 in. for a product having an 8 in. width in ⅜ in. material.  
     
     
         4 . The product of  claim 3 , wherein said linear expansion along said width is about {fraction (1/64)} in.  
     
     
         5 . The product of  claim 1 , wherein said product has a thickness swell of from 0.005 in. to 0.015 in. for a ⅜ in. material.  
     
     
         6 . The product of  claim 5 , wherein said thickness swell is less than 3% of the thickness of ⅜ in. material.  
     
     
         7 . The product of  claim 1 , wherein the sag between the supports ranges from 0.005 in. to 0.035 in. in a 24 in. span between studs.  
     
     
         8 . The product of  claim 7 , wherein said sag between supports is less than 0.035 in.  
     
     
         9 . The product of  claim 1 , wherein the structural degradation due to hygrothermal cycling results in performance from 70% to 100% of the unconditioned (50% relative humidity, 70° F.) values.  
     
     
         10 . The product of  claim 9 , wherein said structural degradation is from 85% to 90% of the unconditioned (50% relative humidity, 70° F.) value.  
     
     
         11 . The product of  claim 1 , wherein the physical change because of hygrothermal cycling is from 1% to 15% of the maximum residual swell.  
     
     
         12 . The product of  claim 11 , wherein said physical change is from 1% to 5% of the maximum residual swell.  
     
     
         13 . The product of  claim 1 , wherein the physical change due to hygrothermal cycling results in little or no checking, erosion, flaking, fiber raising and wherein the adhesion is {fraction (1/16)} to {fraction (3/16)} in. of coating being picked up.  
     
     
         14 . The product of  claim 1 , wherein said adhesion is {fraction (1/16)} in. to ⅛ in. of coating being picked up.  
     
     
         15 . The product of  claim 1 , wherein the permeability of the substrate is from 0.2 to 0.8 perms.  
     
     
         16 . The product of  claim 15 , wherein said permeability is from 0.2 to 0.4 perms.  
     
     
         17 . The product of  claim 1 , wherein the water absorption in 24 hours is from 3% to 15% by weight.  
     
     
         18 . The product of  claim 17 , wherein said water absorption in 24 hours is from 5% to 10% by weight.  
     
     
         19 . The product of  claim 1 , wherein the thickness swell due to water absorption over 24 hours is from 2% to 8%.  
     
     
         20 . The product of  claim 19 , where said thickness swell is less than about 3%.  
     
     
         21 . The product of  claim 1 , wherein the surface absorption (Cobb ring) is from 4 to 300 g/100 sq. in.  
     
     
         22 . The product of  claim 21 , wherein said surface water absorption is from 5 to 10 g/100 sq. in.  
     
     
         23 . The product of  claim 1 , wherein the ignition temperature ranges from 400° to 800° F.  
     
     
         24 . The product of  claim 23 , wherein the ignition temperature is greater than 550° F.  
     
     
         25 . The product of  claim 1 , wherein the hardness ranges from 200 to 1200 lbs.  
     
     
         26 . The product of  claim 25 , wherein the hardness ranges from 300 to 500 lbs.  
     
     
         27 . The product of  claim 1 , wherein the index of resistance to impact is 5-10 in.  
     
     
         28 . The product of  claim 27  wherein the resistance to impact is 7-9 in.  
     
     
         29 . The product of  claim 1 , wherein the nailhead pull through ranges from 150 to 400 lbs.  
     
     
         30 . The product of  claim 29 , wherein the nailhead pull through is about 170 to 190 lbs.  
     
     
         31 . The product of  claim 1 , wherein the lateral nail resistance along the strong direction is about 150 to 300 lbs.  
     
     
         32 . The product of  claim 1 , wherein the product stiffness (EI) ranges from 9150 to 68,500 lbs.-in. 2 /foot of width.  
     
     
         33 . The product of  claim 32 , wherein the product stiffness (EI) ranges from 15,500 to 36,900 lbs.-in. 2 /foot of width.  
     
     
         34 . The product of  claim 1 , wherein the product bending strength (M) ranges from 49 to 190 foot-lbs./foot of width.  
     
     
         35 . The product of  claim 34 , wherein the product bending strength ranges from 80 to 165 foot-lbs./foot of width.