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US3963647A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrostatically paintable injection moldable blend of propylene polymer, ethylene/higher α-olefin copolymer rubber and carbon black

Assignee: EIDP Inc
•
Filing: 1974-08-22
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Granted: 1976-06-15
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Expires: 1994-08-22
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Abstract

Abstract An injection moldable, electrostatically paintable polyolefin composition comprising 100 parts of an ethylene/higher α-olefin copolymer rubber, 20-100 parts of a crystalline propylene polymer, and carbon black, said carbon black having a mean particle diameter of from about 15-30 millimicrons, an oil absorption number (A) having a minimum value of about 40 cc/100 g. and a maximum value wherein A is calculated from the formula A = 0.3116D 2 -18.708D +359.67, wherein D is the mean particle diameter, with the proviso that the maximum value of A is never greater than 130 cc/100 g., said carbon black present within a range determined by the following formulas: Minimum parts carbon black = 2.157D -0.0145D 2 -0.00467AD -5.03; maximum parts carbon black = 0.863D -0.005OD 2 -0.00625AD -0.3663A +0.00159A 2 +49.19; wherein A and D have the values given hereinabove and parts carbon black is based upon the total weight of polymers. The elastomeric composition is used for injection molding large thin sheets for use, for example, as sight shields on the exterior of automotive vehicles.

Inventors

  • 👤 Robert Michael Straub

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 13:18
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/16; C08L53/00; C08L2666/00; C08L2666/02; C08L2666/04

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 159 words
In an injection moldable, electrostatically paintable polyolefin composition comprising about 100 parts of an ethylene/higher α-olefin copolymer rubber, about 20-100 parts of crystalline propylene polymer, and carbon black, the improvement which comprises said carbon black having a mean particle diameter of from about 15-30 millimicrons and an oil absorption number (A) having a minimum value of about 40 cc/100 g. and a maximum value wherein A is calculated from the formula: A = 0.3116d 2 -18.708d +359.67, wherein D is the mean particle diameter, with the proviso that the maximum value of A is never greater than 130 cc/100 g., said carbon black is present within a range determined by the following formulas: Minimum parts carbon black = 2.157D -0.0145D 2 -0.00467AD -5.03; Maximum parts carbon black = 0.863D -0.0050D 2 -0.00625AD -0.3663A +0.00159A 2 + 49.19; wherein A and D have the values given hereinabove and parts of carbon black is based upon the total weight of polymers.
Claim 2
Dependent Claim 159 words
In an injection moldable, electrostatically paintable polyolefin composition comprising about 100 parts of an ethylene/higher α-olefin copolymer rubber, about 20-100 parts of crystalline propylene polymer, and carbon black, the improvement which comprises said carbon black having a mean particle diameter of from about 15-30 millimicrons and an oil absorption number (A) having a minimum value of about 40 cc/100 g. and a maximum value wherein A is calculated from the formula: A = 0.3116d 2 -18.708d +359.67, wherein D is the mean particle diameter, with the proviso that the maximum value of A is never greater than 130 cc/100 g., said carbon black is present within a range determined by the following formulas: Minimum parts carbon black = 2.157D -0.0145D 2 -0.00467AD -5.03; Maximum parts carbon black = 0.863D -0.0050D 2 -0.00625AD -0.3663A +0.00159A 2 + 49.19; wherein A and D have the values given hereinabove and parts of carbon black is based upon the total weight of polymers.
Claim 3
Dependent Claim 20 words
The composition of claim 1 wherein the oil absorption number is within the range of from about 50-75 cc/100 g.
Claim 4
Dependent Claim 27 words
The composition of claim 2 wherein the amount of carbon black is within the range of from about 25-40 parts, based upon the total weight of polymers.
Claim 5
Dependent Claim 10 words
The composition of claim 3 wherein the α-olefin is propylene.
Claim 6
Dependent Claim 20 words
The composition of claim 4 wherein the crystalline propylene polymer contains less than 10% of a comonomer of an α-monoolefin.
Claim 7
Dependent Claim 14 words
The composition of claim 4 wherein the ethylene/propylene copolymer rubber contains a nonconjugated diene.
Claim 8
Dependent Claim 11 words
The composition of claim 6 wherein the nonconjugated diene is 1,4-hexadiene.
Claim 9
Dependent Claim 12 words
The composition of claim 6 wherein the nonconjugated diene is ethylidene norbornene.
Claim 10
Dependent Claim 11 words
The composition of claim 6 wherein the nonconjugated diene is dicyclopentadiene.
Claim 11
Dependent Claim 8 words
The composition of claim 7 which contains norbornadiene.
Claim 12
Dependent Claim 20 words
The composition of claim 6 wherein the propylene polymer is present in an amount of from about 30 to 80.

References Cited (Backward Citations)

US3379673A Cited
US2997451A Cited
US3402140A Cited
US3700614A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-06-15 1979-12-15 1980-06-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-06-15 1983-12-15 1984-06-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-06-15 1987-12-15 1988-06-15 $7700.00 Window Closed / Lapsed

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