US4780498A
Expired / Lapsed
US
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Molding materials of polyoxymethylene homopolymers and/or copolymers and thermoplastic polyurethane elastomers having improved heat stability, their preparation and their use
Assignee: BASF SE
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Filing: 1987-07-24
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Granted: 1988-10-25
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Expires: 2007-07-24
Abstract
Abstract Molding materials of (A) one or more polyoxymethylene homopolymers and/or copolymers and (B) one or more thermoplastic polyurethane elastomers, (C) with or without additives, contain, as an additive, (D) one or more alkaline earth metal silicates, advantageously in an amount of from 0.005 to 2% by weight, based on the weight of the components (A) and (B), for improving the heat stability, reducing the tendency to discoloration and minimizing the free formaldehyde content. To prepare the molding materials, the components (A), (B), (D) and, if required (C) are advantageously melted together in an extruder at from 150° to 260° C. The molding materials are useful for the production of films or moldings, which are used, for example, in the automotive, electrical appliances and electronics industries.
Inventors
- 👤 Heiner Goerrissen
- 👤 Dietrich Saenger
- 👤 Wilhelm Schuette
- 👤 Manfred Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:58
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08L; C08L59/00; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
An improved molding composition comprising a mixture which contains: (a) a polymeric blend consisting of from 40 to 95% by weight of one or more polyoxymethylene polymers selected from the group consisting of polyoxymethylene homopolymers, polyoxymethylene compolymers and mixtures thereof and from 60 to 5.0% by weight of one or more thermoplastic polyurethane elastomers; and (b) an additive consisting of one or more alkaline earth silicates of the formulas MeO.xSiO.sub.2.nH.sub.2 O where Me is an alkaline earth metal, x is a number ranging from 1.4 to 10.0 and n is a number which is equal to or greater than zero, and wherein said additive is present in an amount of from 0.005 to 2.0% by weight based on the total weight of the polymeric blend as defined in (a) above.
Claim 2
Dependent Claim
130 words
An improved molding composition comprising a mixture which contains: (a) a polymeric blend consisting of from 40 to 95% by weight of one or more polyoxymethylene polymers selected from the group consisting of polyoxymethylene homopolymers, polyoxymethylene compolymers and mixtures thereof and from 60 to 5.0% by weight of one or more thermoplastic polyurethane elastomers; and (b) an additive consisting of one or more alkaline earth silicates of the formulas MeO.xSiO.sub.2.nH.sub.2 O where Me is an alkaline earth metal, x is a number ranging from 1.4 to 10.0 and n is a number which is equal to or greater than zero, and wherein said additive is present in an amount of from 0.005 to 2.0% by weight based on the total weight of the polymeric blend as defined in (a) above.
Claim 3
Dependent Claim
22 words
The molding composition according to claim 1, wherein said alkaline earth metal is selected from the group consisting of calcium and magnesium.
Claim 4
Dependent Claim
23 words
The molding composition according to claim 1, wherein the alkaline earth metal silicate has a means particle size of less than 100 microns.
Claim 5
Independent Claim
98 words
A method for improving the heat stability of molding compositions based on blends of high molecular weight polyoxymethylenes and thermoplastic polyurethane elastomers which comprises introducing into said compositions an additive which consists of one or more alkaline earth silicates of the formula MeO.xSiO.sub.2.nH.sub.2 O where Me is an alkaline earth metal, x is a number ranging from 1.4 to 10.0 and n is a number which is equal to or greater than zero, and wherein said additive is introduced in an amount of from 0.005 to 2.0 by weight based on the total weight of the polymer blend.
Claim 6
Independent Claim
98 words
A method for improving the heat stability of molding compositions based on blends of high molecular weight polyoxymethylenes and thermoplastic polyurethane elastomers which comprises introducing into said compositions an additive which consists of one or more alkaline earth silicates of the formula MeO.xSiO.sub.2.nH.sub.2 O where Me is an alkaline earth metal, x is a number ranging from 1.4 to 10.0 and n is a number which is equal to or greater than zero, and wherein said additive is introduced in an amount of from 0.005 to 2.0 by weight based on the total weight of the polymer blend.
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |