Shaped article of composition comprising thermoplastic synthetic

Details Shaped article of composition comprising thermoplastic synthetic Shaped article of composition comprising thermoplastic synthetic

1985-03-18

1986-11-25

Lilling, Herbert J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428220, 428323, 428326, 428327, 428335, 428455, 524 16, C08K 1100, B32B 516

Patent

active

046248803

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 cellular 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.

REFERENCES:
patent: 4042543 (1977-08-01), Strickman et al.
patent: 4172168 (1979-10-01), Klaffke et al.
patent: 4347272 (1972-08-01), Schmidt
Derwent Abs. 06116 W/04 (Fr2223174) 11-1974 G. J. M. Cailleau.
Derwent Abs. 83-786456/41 (9-83) Daikin J58148723A.
Derwent Abs. 54533A/30 (J53070251) Hitachi KK (6-78).
Derwent Abs. 00849D/02 (FR2451350) Oliver T (11-1980).
Derwent Abs. 85-025793/05 (DD-213877A) 9-1984.

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