EP0117664A1
Expired / Lapsed
EP
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Impact resistant polyoxymethylene compositions
Assignee: EIDP Inc
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Filing: 1984-02-07
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Granted: —
•
Expires: 2004-02-07
Abstract
Abstract Polyoxymethylene compositions having 5-15 wt.% thermoplastic polyurethane, where the polyurethane has a soft segment glass transition of lower than 0°C, the polyoxymethylene has a molecular weight of 20,000-100,000, and the polyurethane is dispersed in the polyoxymethylene as discrete particles show extraordinary impact resistance as measured by Gardner impact.
Inventors
- 👤 Edmund Arthur Flexman, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:49
CPC Classifications
C; C08; C08L; C08L59/00; C08L59/02; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 57
Claim 1
Independent Claim
95 words
An impact resistant thermoplastic polyoxymethylene composition consisting essentially of (a) 5-15 weight percent of at least one thermoplastic polyurethane, which polyurethane has a soft segment glass transition temperature of lower than 0°C, and (b) 85-95 weight percent of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a molecular weight of from 20,000 to 100,000, the above-stated percentages being based on the total amount of components (a) and (b) only, the thermoplastic polyurethane being dispersed throughout the polyoxymethylene polymer as discrete particles, and the composition having a Gardner impact value of greater than 9 J.
Claim 2
Dependent Claim
95 words
An impact resistant thermoplastic polyoxymethylene composition consisting essentially of (a) 5-15 weight percent of at least one thermoplastic polyurethane, which polyurethane has a soft segment glass transition temperature of lower than 0°C, and (b) 85-95 weight percent of at least one polyoxymethylene polymer, which polyoxymethylene polymer has a molecular weight of from 20,000 to 100,000, the above-stated percentages being based on the total amount of components (a) and (b) only, the thermoplastic polyurethane being dispersed throughout the polyoxymethylene polymer as discrete particles, and the composition having a Gardner impact value of greater than 9 J.
Claim 3
Dependent Claim
11 words
The composition of Claim 1 wherein the polyoxymethylene is a homopolymer.
Claim 4
Dependent Claim
11 words
The composition of Claim 1 wherein the polyoxymethylene is a copolymer.
Claim 5
Dependent Claim
30 words
The composition of Claim 3 wherein the polyoxymethylene contains at least one comonomer which is an oxyalkylene group with at least two adjacent carbon atoms in the main valence chain.
Claim 6
Dependent Claim
21 words
The composition of Claim 4 wherein the comonomer is selected from the group consisting of alkylene oxides of 2-12 carbon atoms.
Claim 7
Dependent Claim
22 words
The composition of Claim 5 wherein the copolymer is a dipolymer and the comonomer is ethylene oxide. 3 , 5, or 6
Claim 8
Dependent Claim
18 words
The composition of Claim/4,/wherein the weight percent of comonomer in the polyoxymethylene copolymer is from 0.1 to 20.0.
Claim 9
Dependent Claim
18 words
The composition of Claim 7 wherein the comonomer(s) comprise not more than 15.0 weight percent of the copolymer.
Claim 10
Dependent Claim
17 words
The composition of Claim 8 wherein the comonomer(s)comprise about 2 weight percent of the copolymer. to 9
Claim 11
Dependent Claim
14 words
The composition of/Claims 1/which has a Gardner impact value of greater than 17 J.
Claim 12
Dependent Claim
20 words
The composition of ClaimlO which has a Gardner impact value of greater than 25 J. any one of to 11
Claim 13
Dependent Claim
16 words
The composition of/Claimsl/wherein the polyoxymethylene polymer has a number average molecular weight of 25,000 to 90,000.
Claim 14
Dependent Claim
19 words
The composition of Claim 12 wherein the polyoxymethylene polymer has a number average molecular weight of 30,000 to 70,000.
Claim 15
Dependent Claim
24 words
The composition of any one of Claims 1 to 13 wherein in the polyoxymethylene polymer has a melt flow rate of 0.1-30.0 grams/10 minutes.
Claim 16
Dependent Claim
25 words
The composition of Claim 14 wherein the polyoxymethylene polymer has a melt flow rate of 0.5-10 . 0 grams/10 minutes. any one of to 15
Claim 17
Dependent Claim
29 words
The composition of any one of Claims 1 to 15 where in the thermoplastic polyurethane comprises 8 to 12 weight percent of the composition. any one of to 16
Claim 18
Dependent Claim
26 words
The composition of any one of Claims 1 to 16 where in the thermoplastic polyurethane comprises soft segments having a molecular weight of at least 500.
Claim 19
Dependent Claim
21 words
The composition of Claim 17 wherein the thermoplastic polyurethane comprises soft segments having a molecular weight of from 550 to 5000.
Claim 20
Dependent Claim
21 words
The composition of Claim 18 wherein the thermoplastic polyurethane comprises soft segments having a molecular weight of from 1000 to 2500.
Claim 21
Dependent Claim
34 words
The composition of any one of Clamis 1 to 19 where in the thermoplastic polyurethane contains a diol chain extender having a molecular weight of less than about 250. any one of to 20
Claim 22
Dependent Claim
34 words
The composition of any one of Clamis 1 to 19 where in the thermoplastic polyurethane contains a diol chain extender having a molecular weight of less than about 250. any one of to 20
Claim 23
Dependent Claim
25 words
The composition of any one of Claims 1 to 20 wherein the thermoplastic polyurethane has a ratio of isocyanate to hydroxyl of 0.95 to 1.08.
Claim 24
Dependent Claim
20 words
The composition of Claim 21 wherein the thermoplastic polyurethane has a ratio of isocyanate to hydroxyl of 0.95 to 1.05.
Claim 25
Dependent Claim
22 words
The composition of Claim 22 wherein the thermoplastic polyurethane has a ratio of isocyanate to hydroxyl of 0.95 to less than 1.00.
Claim 26
Dependent Claim
32 words
The composition of any one of Clamis 1 to 23 where in the thermoplastic polyurethane is derived from the reaction of a hydroxy terminated polyester, a diol chain extender and a diisocyanate.
Claim 27
Dependent Claim
32 words
The composition of any one of Clamis 1 to 23 where in the thermoplastic polyurethane is derived from the reaction of a hydroxy terminated polyester, a diol chain extender and a diisocyanate.
Claim 28
Dependent Claim
24 words
The composition of Claim 24 wherein the polyester is selected from the group consisting of poly ε-caprolactone, poly(butylene adipate), poly(ethylene adipate) and mixtures thereof.
Claim 29
Dependent Claim
31 words
The composition of any one of Claim 1 to 23 wherein the thermoplastic polyurethane is derived from the reaction of a hydroxy terminated polyether, a diol chain extender and a diisocyanate.
Claim 30
Dependent Claim
32 words
The composition of Claim 26 wherein the polyether is selected from the group consisting of polytetramethylene ether glycol, poly(propylene oxide), poly(ethylene oxide), copolymers of propylene oxide and ethylene oxide, and mixtures thereof.
Claim 31
Dependent Claim
24 words
24 or 28. The composition of Claim/25 wherein the thermoplastic polyurethane is derived from the reaction of butylene adipate and 4,4'-methylene bis(phenylisocyanate) and 1,4-butanediol.
Claim 32
Dependent Claim
26 words
The composition of Claim 24/wherein the diisocyanate is selected from the group consisting of 4,4'-methylene bis(phenylisocyanate), 1,6-hexamethylene diisocyanate, 4,4'-methylene bis(cyclohexyl isocyanate) and 2,4-tolylene diisocyanate. or 27
Claim 33
Dependent Claim
24 words
The composition of Claim 26/wherein the diisocyanate is selected from the group consisting of 4,4'-methylene bis(phenylisocyanate), 1,6-hexamethylene diisocyanate, 4,4'-methylene bis(cyclohexyl isocyanate) and 2,4-tolylene diisocyanate.
Claim 34
Dependent Claim
11 words
The composition of Claim 29 wherein the diisocyanate is 4,4'-methylene bis(phenylisocyanate).
Claim 35
Dependent Claim
26 words
The composition of any one of Claims 24 to 31 where in the glycol is selected from the group consisting of .1,4-butanediol, ethylene glycol and 1,6-hexanediol.
Claim 36
Dependent Claim
10 words
The composition of Claim 32 wherein the glycol is 1,4-butanediol.
Claim 37
Dependent Claim
17 words
The composition of/Claimsl/wherein the thermoplastic polyurethane has a soft segment glass transition temperature of lower than -10°C.
Claim 38
Dependent Claim
19 words
The composition of Claim34 wherein the thermoplastic polyurethane has a soft segment glass transition temperature of lower than -15°C.
Claim 39
Dependent Claim
21 words
The composition of Claim 35 wherein the thermoplastic polyurethane has a soft segment glass transition temperature of lower than about -30°C.
Claim 40
Dependent Claim
23 words
37 . The composition of any one of Claims 1 to 36 which is suited for use in the preparation of shaped articles.
Claim 41
Dependent Claim
14 words
Shaped articles made from the composition of any one of Claims 1 to 37.
Claim 42
Dependent Claim
23 words
A shaped article of Claim 38selected from the group consisting of sheet, profiles, rod stock, film, filaments, fibers, strapping, tape, tubing and pipe.
Claim 43
Dependent Claim
30 words
38 or 40. A shaped article of Claim/39 which has been post treated by a technique selected from the group consisting of orientation, stretching, coating, annealing, painting, laminating and plating.
Claim 44
Independent Claim
51 words
A method of preparing the compositions of any one of Claims 1 to 37 comprising mixing the thermoplastic polyurethane with the polyoxymethylene polymer under high shear at a temperature above the melting points of the ingredients of the composition and below the temperature at which degradation of the ingredients will occur.
Claim 45
Dependent Claim
23 words
The method of Claim 41 wherein the temperature measured exit the die at which the ingredients are mixed is from 170 to 260°C.
Claim 46
Dependent Claim
23 words
The method of Claim 42 wherein the temperature measured exit the die at which the ingredients are mixed is from 185 to 240°C.
Claim 47
Dependent Claim
23 words
The method of Claim 42 wherein the temperature measured exit the die at which the ingredients are mixed is from 200 to 230°C.
Claim 48
Independent Claim
25 words
The method of any one of any one of Claims 41 to 44 wherein the high shear mixing is conducted in a twin screw extruder.
Claim 49
Dependent Claim
13 words
The method of Claim 45 wherein the compositions exiting the extruder is quenched.
Claim 50
Dependent Claim
35 words
A method of preparing shaped articles of 38 or 40 Claim 38, 39, or 40 selected from the group consisting of compression molding, injection molding, extrusion, blow molding, rotational molding, melt spinning, thermoforming and stamping.
Claim 51
Dependent Claim
9 words
The method of Claim 47 which is injection molding.
Claim 52
Dependent Claim
23 words
The method of Claim 47 or 48 wherein the composition is heated prior to shaping to a temperature of from 170 to 250°C.
Claim 53
Dependent Claim
21 words
The method of Claim 49 wherein the composition is heated prior to shaping to a temperature of from 185 to 240°C.
Claim 54
Dependent Claim
28 words
47 or 51. The method of Claim/48 wherein the composition is heated prior to molding to a temperature of from 20 0 ° C to 230 ° C.
Claim 55
Independent Claim
28 words
The method of any one of Claims 47 to 51 which is one of the forms of molding and wherein the mold temperature is from 10 to 120°C.
Claim 56
Dependent Claim
14 words
The method of Claim 52 wherein the mold temperature is from 10 to 100°C.
Claim 57
Dependent Claim
14 words
The method of Claim 53 wherein the mold temperature is from 50 to 90°C.
References Cited (Backward Citations)
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