C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
18/644
C08K 11/00 (2006.01) B29C 47/00 (2006.01) B29C 67/20 (2006.01) C08L 23/08 (2006.01) C08L 97/02 (2006.01)
Patent
CA 1236668
SHAPED ARTICLE OF COMPOSITION COMPRISING THERMOPLASTIC SYNTHETIC RESIN AND CELLULAR MATERIAL AND METHOD OF PRODUCING SAME ABSTRACT A rail pad or other shaped article in the form of a resiliently compressible extrudate having a textured surface and comprising particles or granules of cork or similar resiliently compressible cellular material substantially homogenously dispersed throughout a polymeric matrix of generally saturated thermoplastic synthetic resin, preferably ethylene/vinyl acetate copolymer, which has a stiffness modulus of not more than 1000 MPa and is extrudable under conditions at which the cellular material is not significantly degraded, the extrudate having a Poissons ratio less than that of the matrix. The article may be made by forming a hot dough of the matrix and cellular material, feeding the dough in heat-softened state to an extruder, extruding it under conditions which compress the celluar material but avoid any significant mechanical breakdown or denaturing thereof, and relieving the compression of the cellular material downstream of the die but before the matrix has cooled to a temperature which would prevent this.
477107
Goulding Leslie B.
Johnson Ian F.
Goudreau Gage Dubuc
Walker (james) & Co Limited
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