US4582869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxymethylene/polyurethane compositions containing ethylene bis-stearamide
Assignee: EIDP Inc
•
Filing: 1984-02-21
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Granted: 1986-04-15
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Expires: 2004-02-21
Abstract
Abstract Polyoxymethylene/thermoplastic polyurethane compositions having 5-40 weight percent polyurethane are modified by incorporating therein 0.2-1.0 weight percent ethylene bis-stearamide to improve mold release and mold deposit.
Inventors
- 👤 Marion G. Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:26
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; C08L; C08L59/00; C08L59/02; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
A thermoplastic polyoxymethylene composition consisting essentially of (a) 5-40 weight percent of at least one thermoplastic polyurethane, which polyurethane has a glass transition temperature of lower than 0° C., (b) 0.2-1.0 weight percent of ethylene bis-stearamide, and (c) a complemental amount of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a weight average molecular weight of from 20,000 to 100,000, wherein said weight percents recited above for components (a) and (b) are each based on the total of components (a), (b) and (c).
Claim 2
Dependent Claim
84 words
A thermoplastic polyoxymethylene composition consisting essentially of (a) 5-40 weight percent of at least one thermoplastic polyurethane, which polyurethane has a glass transition temperature of lower than 0° C., (b) 0.2-1.0 weight percent of ethylene bis-stearamide, and (c) a complemental amount of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a weight average molecular weight of from 20,000 to 100,000, wherein said weight percents recited above for components (a) and (b) are each based on the total of components (a), (b) and (c).
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the quantity of polyurethane is 5-15 weight percent, and the quantity of ethylene bis-stearamide is 0.2-0.4 weight percent.
Claim 4
Dependent Claim
24 words
The composition of claim 1 wherein the quantity of polyurethane is 15-40 weight percent, and the quantity of ethylene bis-stearamide is 0.3-1.0 weight percent.
Claim 5
Dependent Claim
30 words
The composition of claim 2 wherein the polyurethane is dispersed throughout the polyoxymethylene polymer as discrete particles, and the composition has a Gardner impact value of greater than 9 J.
Claim 6
Dependent Claim
57 words
The composition of claim 3 wherein the polyurethane has a glass transition temperature of lower than -15° C., the polyurethane is dispersed throughout the polyoxymethylene polymer as a separate phase having an average cross-sectional size in the minimum dimension of not greater than 0.9 microns, and the composition has an Izod value of greater than 375 J/m.
Claim 7
Dependent Claim
17 words
The composition of claim 4 wherein the polyoxymethylene is a homopolymer with a molecular weight of 30,000-70,000.
Claim 8
Dependent Claim
17 words
The composition of claim 5 wherein the polyoxymethylene is a homopolymer with a molecular weight of 30,000-70,000.
Claim 9
Dependent Claim
15 words
The composition of claim 4 wherein the Gardner impact value is greater than 25 J.
Claim 10
Dependent Claim
14 words
The composition of claim 5 wherein the Izod value is greater than 650 J/m.
Claim 11
Dependent Claim
18 words
The composition of claim 4 wherein the thermoplastic polyurethane comprises 8 to 12 weight percent of the composition.
Claim 12
Dependent Claim
18 words
The composition of claim 5 wherein the thermoplastic polyurethane comprises 25 to 32 weight percent of the composition.
Claim 13
Dependent Claim
22 words
The composition of claim 4 wherein the thermoplastic polyurethane is derived from the reaction of butylene adipate, methylene bis(phenylisocyanate) and 1,4-butane diol.
Claim 14
Dependent Claim
22 words
The composition of claim 5 wherein the thermoplastic polyurethane is derived from the reaction of butylene adipate, methylene bis(phenylisocyanate) and 1,4-butane diol.
Claim 15
Independent Claim
111 words
A method for improving the mold release and mold deposit characteristics of a thermoplastic polyoxymethylene composition, said composition consisting essentially of: (a) 5-40 weight percent of at least one thermoplastic polyurethane, which polyurethane has a glass transition temperature of lower than 0° C., and (b) a complemental amount of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a weight average molecular weight of from 20,000 to 100,000, said method comprising incorporating into the polyoxymethylene composition 0.2-1.0 weight percent of ethylene bis-stearamide, wherein said weight percents recited above for component (a) and for the ethylene bis-stearamide are each based on the total of components (a) and (b) and the ethylene bis-stearamide.
Claim 16
Independent Claim
111 words
A method for improving the mold release and mold deposit characteristics of a thermoplastic polyoxymethylene composition, said composition consisting essentially of: (a) 5-40 weight percent of at least one thermoplastic polyurethane, which polyurethane has a glass transition temperature of lower than 0° C., and (b) a complemental amount of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a weight average molecular weight of from 20,000 to 100,000, said method comprising incorporating into the polyoxymethylene composition 0.2-1.0 weight percent of ethylene bis-stearamide, wherein said weight percents recited above for component (a) and for the ethylene bis-stearamide are each based on the total of components (a) and (b) and the ethylene bis-stearamide.
Claim 17
Dependent Claim
24 words
The method of claim 14 wherein the quantity of ethylene bis-stearamide is 0.2-0.4 weight percent, and the quantity of polyurethane is 5-15 weight percent.
Claim 18
Dependent Claim
24 words
The method of claim 14 wherein the quantity of ethylene bis-stearamide is 0.3-1.0 weight percent, and the quantity of polyurethane is 15-40 weight percent.
Claim 19
Dependent Claim
20 words
The method of claim 14 wherein the ethylene bis-stearamide is incorporated into the composition by melt compounding under high shear.
Claim 20
Dependent Claim
9 words
Shaped articles made from the composition of claim 1.
Claim 21
Dependent Claim
22 words
A method of preparing the shaped articles of claim 18 by injection molding where the mold temperature is 10° to 120° C.
Claim 22
Dependent Claim
14 words
The method of claim 19 wherein the mold temperature is 50° to 90° C.
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |