US4746688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remoldable, wood-filled acoustic sheet
Assignee: Ford Motor Co
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Filing: 1987-05-21
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Granted: 1988-05-24
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Expires: 2007-05-21
Abstract
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.
Inventors
- 👤 Leo T. Bistak
- 👤 Daniel C. Himebaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L1/00; C08L19/00; C08L19/003; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L23/12; C08L23/16; C08L23/26; C08L23/28; C08L51/00; C08L51/06; C08L97/00; C08L97/02; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/34; C08L2205/00; C08L2205/14; C08L2205/22; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
102 words
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° 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.
Claim 2
Dependent Claim
102 words
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° 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.
Claim 3
Dependent Claim
20 words
The extrudable composition according to claim 1, wherein said composition further comprises at least 1 part by weight ground talc.
Claim 4
Dependent Claim
25 words
The extrudable composition according to claim 2, wherein said composition further comprises inorganic fillers selected from calcium carbonate, iron oxide, lead oxide and barium sulfate.
Claim 5
Dependent Claim
13 words
The extrudable composition according to claim 1, wherein said polyolefin resin comprises polypropylene.
Claim 6
Dependent Claim
13 words
The extrudable composition according to claim 4, wherein said polypropylene is polypropylene homopolymer.
Claim 7
Dependent Claim
23 words
The extrudable composition according to claim 1, wherein said cellulosic particulate filler has a particle size between about 0.15 and about 0.425 mm.
Claim 8
Dependent Claim
35 words
The extrudable composition according to claim 1, wherein said cellulosic particulate filler is selected from the group consisting of soft wood flour, hard wood flour, sawdust, ground corn cobs, ground rice hulls and shell flours.
Claim 9
Dependent Claim
24 words
The extrudable composition according to claim 7, wherein the cellulosic particulate filler is selected from soft wood flour, hard wood flour and mixtures thereof.
Claim 10
Dependent Claim
24 words
The extrudable composition according to claim 7, wherein said cellulosic particulate filler has a water content of less than about 10 percent by weight.
Claim 11
Dependent Claim
42 words
The extrudable composition according to claim 1, wherein the rubber material of said crosslinked elastomeric rubber particles is selected from ethylene-propylenediene rubber, nitrile rubber, chlorinated butyl rubber, styrene-butadiene rubber, bromobutyl rubber, vinyl acetate ethylene copolymers and compatible mixtures of any of them.
Claim 12
Dependent Claim
12 words
Remoldable panels having sound-deadening properties made from the composition of claim 1.
Claim 13
Dependent Claim
9 words
Articles made by remolding the panels of claim 11.
Claim 14
Independent Claim
136 words
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° 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.
Claim 15
Independent Claim
136 words
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° 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.
Claim 16
Dependent Claim
24 words
The method for producing remoldable panels according to claim 13, wherein said composition further comprises at least about 1 part by weight ground talc.
Claim 17
Dependent Claim
28 words
The method for producing remoldable panels according to claim 14, wherein said composition further comprises inorganic fillers selected from calcium carbonate, iron oxide, lead oxide and barium sulfate.
Claim 18
Dependent Claim
16 words
The method for producing remoldable panels according to claim 13, wherein said polyolefin resin comprises polypropylene.
Claim 19
Dependent Claim
16 words
The method for producing remoldable panels according to claim 16, wherein said polypropylene is polypropylene homopolymer.
Claim 20
Dependent Claim
26 words
The method for producing remoldable panels according to claim 13, wherein said cellulosic particulate filler has a particle size between about 0.15 to about 0.425 mm.
Claim 21
Dependent Claim
38 words
The method for producing remoldable panels according to claim 13, wherein said cellulosic particulate filler is selected from the group consisting of soft wood flour, hard wood flour, sawdust, ground corn cobs, ground rice hulls and shell flours.
Claim 22
Dependent Claim
27 words
The method for producing remoldable panels according to claim 13, wherein the cellulosic particulate filler is selected from soft wood flour, hard wood flour and mixtures thereof.
Claim 23
Dependent Claim
26 words
The method for producing remoldable panels according to claim 13, wherein said cellulosic particulate fillers have a water content less than about 10 percent by weight.
Claim 24
Dependent Claim
45 words
The method for producing remoldable panels according to claim 13, wherein the rubber material of said crosslinked elastomeric rubber particles is selected from ethylene-propylenediene rubber, nitrile rubber, chlorinated butyl rubber, styrene-butadiene rubber, bromobutyl rubber, vinyl acetate ethylene copolymers and compatible mixtures of any of them.
Claim 25
Dependent Claim
13 words
Remoldable panels having sound-deadening properties made according to the method of claim 13.
Claim 26
Dependent Claim
9 words
Articles made by remolding the panels of claim 23.
Claim 27
Dependent Claim
124 words
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° 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.
Claim 28
Dependent Claim
124 words
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° 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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |