Patent US4141879A successfully refreshed from Google Patents.
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
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
2026-11-05 21:25
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)
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 |