Branched polyarylene sulfide resin, method for manufacturing same and use as polymer modifier

a polyarylene sulfide resin and branched technology, applied in the field ofbranched polyarylene sulfide resin, can solve the problems of corrosion to a metal mold during molding processing as described above, environmental pollution as evidenced by halogen regulations becomes problem, and it is difficult to achieve a balance between processability or fusion characteristics and burr suppressing characteristics during injection molding. , to achieve the effect of rationalizing melt viscosity, suppressing burr generation

Inactive Publication Date: 2016-08-18
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0040]In the branched PAS resin including an —S— substituent group with a cleaved disulfide compound of the present invention, the halogen (chlorine) content is low, and it is possible to rationalize the melt viscosity and it is possible to realize a wider range of numerical value of melt viscoelasticity tan δ which is an indicator of branched structure. The branched PAS resin including an —S— substituent group with a cleaved disulfide compound of the present invention can significantly suppress generation of burrs, reduce the halogen content, and solve environmental problems (low halogenation) and problems of corrosion to a metal mold, when blended with a thermoplastic resin such as a linear PAS resin as the polymer modifier. Further, the branched PAS resin including an —S— substituent group with a cleaved disulfide compound of the present invention is a granular resin excellent in thermal stability and processability.

Problems solved by technology

When such a PAS resin having a high halogen content is used, the corrosion to a metal mold during molding processing as described above or environmental pollution as evidenced by halogen regulations become problems.
Further, since the manufacturing conditions of the PAS resin are wide ranging, it is difficult to adjust the conditions.
Particularly, it is difficult to achieve a balance between processability or fusion characteristics and burr suppressing characteristics during injection molding.
There is a disadvantage in that the amount of burrs generated during injection molding is large.
However, although a PAS resin having a low halogen content and excellent characteristics of suppressing generation of burrs has been earnestly developed, a target resin having such characteristics has not currently been obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

working example 1

(1) Dehydration Step

[0164]1,950 g of a sodium hydrosulfide (NaSH) solution with a concentration of 61.8 wt % as analyzed by iodometry (NaSH unit: 21.50 mol), 1,191 g of a sodium hydroxide (NaOH) solution with a concentration of 73.7 wt % (NaOH unit: 21.94 mol) and 6,000 g of N-methyl-2-pyrrolidone (hereinafter abbreviated as “NMP”) were charged into a 20 L titanium lined autoclave with a stirrer (hereinafter abbreviated as “reactor”).

[0165]The inside of the reactor was replaced with nitrogen gas. Thereafter, the temperature of the reactor was increased to 200° C. over about 4 hours while the reactor was stirred. Thus, 985 g of water and 891 g of NMP were distilled. At that time, 12.5 g of hydrogen sulfide (H2S) (0.37 mol) was flowed (vaporized). Therefore, the amount of effective S in the reactor after the dehydration step was 21.13 mol (the effective amount of S corresponds to the charged sulfur source).

(2) Charging Step

[0166]After the dehydration step, the content remaining in the...

working example 2

[0171]A polymer was produced in the same manner as in Working Example 1 except that the amount of DPDS in the polymerization step of Working Example 1 was 34.5 g and the ratio of DPDS to the effective S (mol / mol) was 0.0075. The ratio of TCB to DPDS (mol / mol) was 3.5. The yield of granular polymer was 80%. The average particle size was 504 p.m.

[0172]The resulting branched PAS resin including an —S— substituent group with a cleaved disulfide compound had a melt viscosity A of 300,000 Pa·s, a melt viscosity B of 1,427 Pa·s, a chlorine content of 1,550 ppm and a melt viscoelasticity tan δ of 0.20. The data was shown in Table 1.

working example 3

[0173]A polymer was produced in the same manner as in Working Example 1 except that the amount of DPDS in the polymerization step of Working Example 1 was 23.1 g and the ratio of DPDS to the effective S (mol / mol) was 0.005. The ratio of TCB to DPDS (mol / mol) was 5.2. The yield of granular polymer was 78%. The average particle size was 320 p.m.

[0174]The resulting branched PAS resin including an —S— substituent group with a cleaved disulfide compound had a melt viscosity A of 460,000 Pa·s, a chlorine content of 1,650 ppm and a melt viscoelasticity tan δ of 0.14. The melt viscosity B was too high to measure. The data was shown in Table 1.

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Abstract

Disclosed is a branched polyarylene sulfide resin including an —S— substituent group with a cleaved disulfide compound which has a melt viscosity as measured at a halogen content of 4,000 ppm or less, a temperature of 330° C. and a shear rate of 2 sec−1 of 1.0×104 to 50.0×104 Pa·s and a melt viscoelasticity tan δ as measured at a temperature of 310° C. and an angular velocity of 1 rad / sec of 0.1 to 0.6.

Description

TECHNICAL FIELD[0001]The present invention relates to a branched polyarylene sulfide resin including an —S— substituent group with a cleaved disulfide compound and a method for manufacturing the same. More particularly, the present invention relates to a branched polyarylene sulfide resin including an —S— substituent group with a cleaved disulfide compound which can solve problems of corrosion to a metal mold due to halogen and environmental problems and provide a molded product with significantly suppressed burrs (which are problematic during molding processing) when used as a burr suppressor and which has highly balanced characteristics of the halogen content, the melt viscosity and the melt viscoelasticity tan δ and a method for manufacturing the same. Further, the present invention relates to use of the branched polyarylene sulfide resin as a polymer modifier.BACKGROUND ART[0002]Polyarylene sulfide resins (hereinafter abbreviated as “PAS resin”), representative examples of which...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G75/0231C08G75/0213C08G75/0259C08G75/02C08G75/0209C08G75/0268C08G75/0277
CPCC08G75/02C08G75/0259C08G75/0231C08G75/0213C08G75/0209C08G75/0268C08G75/0277C08G2261/63C08G2261/132
Inventor KONNO, AKIHIROSUZUKI, YASUHIRO
Owner KUREHA KAGAKU KOGYO KK
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