Remoldable, wood-filled acoustic sheet
AssigneeFord Motor Company
InventorsLeo T. Bistak, Daniel C. Himebaugh
Life of this patent
Estimating the term…
Abstract
This invention is directed to a thermoplastic composition comprising polyolefin resin, cellulosic particulate and crosslinked elastomeric rubber microparticles, which composition can be extruded into sheets and subsequently remolded into three dimensional, thermoplastic articles having sound-deadening properties. Preferably, the polyolefin is polypropylene homopolymer and the cellulosic particulate is woodflour.
Claims25
An extrudable composition suitable for producing remoldable panels having sound-deadening properties, said extrudable composition comprising a mixture of:
- (A) 100 parts by weight polyolefin resin having a softening point of at least about 120.degree. C.;
- (B) between about 20 and about 150 parts by weight cellulosic particulate filler having a length/diameter ratio between about 1 and about 10 and a particle size between about 0.01 and about 15 mm;
- and (C) between about 20 and about 120 parts by weight crosslinked elastomeric rubber particles having an average particle diameter of less than about 50 microns and being dispersible in said extrudable mixture.
A method for producing remoldable panels having sound-deadening properties, which method comprises:
- providing an extrudable composition comprising a mixture of:
- (A) 100 parts by weight polyolefin resin having a softening point of at least about 120.degree. C.;
- (B) between about 20 and about 150 parts by weight cellulosic particulate filler having a length/diameter ratio between about 1 and about 10 and a particle size between about 0.01 and about 1.5 mm;
- and (C) between about 20 and about 120 parts by weight crosslinked elastomeric rubber particles having an average particle diameter of less than about 50 microns and being dispersible in said mixture;
- and
- extruding said mixture into panels while heating said composition to a temperature above the softening point of said polyolefin resin and below the temperature of substantial decomposition of said cellulosic particulate filler.
An extrudable composition suitable for producing remoldable panels having sound-deadening properties, said extrudable composition comprising a mixture of:
- (A) 100 parts by weight polypropylene resin having a softening point of at least about 120.degree. C.;
- (B) between about 20 and about 150 parts by weight wood flour having a length/diameter ratio between about 1 and about 10 and a particle size of between about 0.01 and about 15 mm;
- (C) between about 20 and about 120 parts by weight crosslinked elastomeric rubber particles having an average particle diameter of less than about 50 microns and being dispersible in said extrudable mixture;
- (D) between about 1 and about 10 parts by weight ground talc;
- and (E) up to about 180 part by weight barium sulfate.
Dependencies are inferred from the claim text.