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Polyoxymethylene resin compositions having enhanced tensile elongation, thermal stability and impact resistance

A technology of polyoxymethylene resin and composition, which is applied in the field of new polyoxymethylene resin composition, and can solve problems such as difficult handling and low thermal stability

Inactive Publication Date: 2004-05-05
KOREA ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned polyoxymethylene composition containing polyurethane elastomer particles also has various disadvantages, including difficulty in handling during injection molding due to its low thermal stability, and difficulty in handling during extrusion due to its phase separation or mold swelling. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] Polyurethane elastomers are prepared by reacting long-chain diols with diisocyanates to produce polyurethane prepolymers, which have isocyanate end groups, and then polymerizing the prepolymers together with diol chain extenders. Representative long chain diols are polyester diols such as poly(dibutyl adipate) diol, poly(diethyl adipate) diol and poly(ε-caprolactone) diol; and polyethers Diols such as poly(tetramethylene ether) glycol, poly(propylene oxide) glycol and poly(ethylene oxide) glycol.

[0035] Described diisocyanate is 4,4-methylene bis(phenyl isocyanate), 2,4-toluene diisocyanate, 1,6-hexamethylene diisocyanate and 4,4'-methylene di(cyclo oxyisocyanate), of which 4,4' methylene bis(phenyl isocyanate) and 2,4-toluene diisocyanate are preferred.

[0036] A typical diol chain extender used in the present invention is C 2-6 Fatty diols such as ethylene glycol, 1,4-butanediol, 1,6-hexanediol and neopentyl glycol.

[0037] The polyurethane elastomer of the pre...

Embodiment 1 to 3 and comparative example 1 to 3

[0074] In order to prove that the polyoxymethylene resin composition containing components A, B, and D of the present invention is improved in elongation, impact strength and processability, various resin compositions were prepared and compared with no stabilizer i.e. A sample of part D was compared. The test results are shown in Table 1.

[0075] Component, % by weight

to stretch

Elongation,

%

Izod impact strength

(kgf cm / cm)

mold

swelling

on the mold

deposition

A

B

D

Example 1

94.0

5.0

1.0

55

7.0

1

1

Example 2

81.0

15.0

4.0

95

9.0

1

1

Example 3

68.0

25.0

7.0

180

10.5

2

1

Comparative example 1

95.0

5.0

0

45

7.0

1

1

Comparative example 2

85.0

15.0

...

Embodiment 4-1 to Embodiment 7 and comparative example 4-7

[0079] In order to illustrate the excellent rheological properties of the polyoxymethylene resin composition containing components A, B, C and D of the present invention, the following resin composition was prepared and compared with a reference composition without component D . The test results are shown in Table 2.

[0080] Component

to stretch

Elongation

(%)

Izod Shock

intensity

(kgf cm / cm)

mold

swelling

on the mold

deposition

A

B

C

D

Example

4-1 a)

88.0

10.0

2.0

1.0 c)

180

10.7

3

2

Example

4-2 a)

88.0

10.0

2.0

2.0 c)

215

11.0

2

2

Example

4-3 a)

88.0

10.0

2.0

3.0 c)

228

11.5

2

1

comparative example...

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PUM

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Abstract

A polyoxymethylene resin composition, having enhanced tensile elongation, thermal stability, processibility and impact resistance, comprises: (i) from 50 to less than 97 % by weight of a polyoxymethylene resin; (ii) from 3 to less than 50 % by weight of an elastomer having a thermoplastic polyester elastomer and optionally a thermoplastic polyurethane elastomer; and (iii) from 0.1 to less than 10 % by weight of a maleic anhydride-grafted polymer, based on the total weight of (i), (ii) and (iii).

Description

technical field [0001] The present invention relates to a novel polyoxymethylene resin composition having improved tensile length or tensile elongation, impact resistance, thermal stability and processability, which contains a polyoxymethylene matrix, a polyester elastomer and optionally polyurethane elastomers, and maleic anhydride-grafted polymers. Background technique [0002] Due to its good mechanical, chemical, physical and electrical properties, polyoxymethylene has been widely used in various applications. However, for some applications, the impact strength of traditional acetal resins is not high enough. Thus, there have been various attempts to develop polyoxymethylene resins having improved impact resistance by adding another polymer component thereto. [0003] For example, a number of polyoxymethylene blends have been reported, which contain: rubbery polymers containing cyano or carboxylate groups, as disclosed in, for example, Japanese Patent Publication No. 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/00C08F255/00C08F255/06C08F257/02C08L51/00C08L59/00C08L59/02
CPCC08L59/02C08F255/06C08L59/00C08F257/02C08F255/00C08L51/003
Inventor 金琢圭李钟泽洪起昌
Owner KOREA ENG PLASTICS CO LTD