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US4141879A Expired / Lapsed US ⏱️ 0.0 years remaining

Thermoplastic alloy

Assignee: SALFLEX Inc
•
Filing: 1978-08-09
•
Granted: 1979-02-27
•
Expires: 1998-08-09
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Abstract

Abstract The present invention provides a thermoplastic material for use under conditions demanding high strength at elevated temperatures, e.g., for under-the-hood automotive or truck components. The material is essentially a three-component alloy of a homopolymer polyamide, a copolymer polyamide, and polyurethane reinforced with a relatively small amount of glass fibers and containing normal amounts of heat stabilizers, ultraviolet screen materials, etc. The material can be formed by any conventional forming method, e.g., by extrusion, injection molding, blow molding, vacuum forming, and the like. Finished articles made from the material are characterized by elevated deflection temperatures (400° F at 66 psi and 300° F at 264 psi) and high tensile and flexural strengths.

Inventors

  • 👤 Glenn G. McCarroll

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 23:19
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10314; F02M35/10321; C; C08; C08K; C08K13/00; C08K13/04; C08K3/00; C08K3/01; C08K3/014; C08K3/02; C08K3/04; C08K5/00; C08K5/02; C08K5/16; C08K5/29; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L75/00; C08L75/04; C08L77/00; F02M35/1034; F02M35/10347; F05; F05C; F05C2225/00; F05C2225/08

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 43 words
A thermoplastic molding compound consisting essentially of from 15%-26% of a homopolymer polyamide, from 35%-65% copolymer polyamide, 9%-18% polyurethane, from 2%-12% chopped glass fibers, from 1/2%-1.5% metallic heat stabilizers, 0.25% to 1.25% isocyanate, 0.25% to 1.25% methylene chloride, and from 1%-2% carbon black.
Claim 2
Dependent Claim 43 words
A thermoplastic molding compound consisting essentially of from 15%-26% of a homopolymer polyamide, from 35%-65% copolymer polyamide, 9%-18% polyurethane, from 2%-12% chopped glass fibers, from 1/2%-1.5% metallic heat stabilizers, 0.25% to 1.25% isocyanate, 0.25% to 1.25% methylene chloride, and from 1%-2% carbon black.
Claim 3
Dependent Claim 94 words
A thermoplastic molding alloy consisting essentially of about 26% homopolymer polyamide, about 55% copolymer polyamide, about 11% polyurethane, about 3% chopped glass fibers, about 1% copper halide heat stabilizer, about 1% isocyanate, about 1% methylene chloride, and about 2% carbon black having the following properties, as molded: ______________________________________ Specific Gravity 1.105 Melt Point 410-420 Tensile Strength (PSI) 21,500 Tensile Yield (PSI) 19,200 Flexural Strength (PSI) 16,500 Flexural Modulus (PSI) 425,000 Notch Izod Impact Strength (FT.LBS./IN.) 1.8 Deflection Temp. at 66 psi 400 F at 264 psi 300 F at 264 psi -50 F ______________________________________
Claim 4
Dependent Claim 94 words
A thermoplastic molding alloy consisting essentially of about 26% homopolymer polyamide, about 55% copolymer polyamide, about 11% polyurethane, about 3% chopped glass fibers, about 1% copper halide heat stabilizer, about 1% isocyanate, about 1% methylene chloride, and about 2% carbon black having the following properties, as molded: ______________________________________ Specific Gravity 1.105 Melt Point 410-420 Tensile Strength (PSI) 21,500 Tensile Yield (PSI) 19,200 Flexural Strength (PSI) 16,500 Flexural Modulus (PSI) 425,000 Notch Izod Impact Strength (FT.LBS./IN.) 1.8 Deflection Temp. at 66 psi 400 F at 264 psi 300 F at 264 psi -50 F ______________________________________

References Cited (Backward Citations)

FR41759E Cited
US3249563A Cited
JPS4999355A Cited
US4062819A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-02-26 1982-08-28 1983-02-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-02-26 1986-08-28 1987-02-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-02-26 1990-08-28 1991-02-27 $7700.00 Window Closed / Lapsed

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