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Method for preparation of disphenol-Apolycarbonate with reduced levels of fries

A technology of polycarbonate and diester carbonate, applied in the field of low Frisian polycarbonate, to prepare these compositions, which can solve the problems of large equipment and capital investment, low ductility, etc.

Inactive Publication Date: 2004-03-24
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the operation of methods that require phosgene as a reactant is a disadvantage due to obvious safety concerns
Second, the method that requires the use of large amounts of organic solvents to operate is a disadvantage since costly precautions must be taken to prevent any adverse environmental effects
Third, the interface approach requires a relatively large investment in equipment and capital
However, due to its high Fris content, low Fris polycarbonate prepared by the melt process usually has rather low ductility

Method used

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  • Method for preparation of disphenol-Apolycarbonate with reduced levels of fries
  • Method for preparation of disphenol-Apolycarbonate with reduced levels of fries
  • Method for preparation of disphenol-Apolycarbonate with reduced levels of fries

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preparation example Construction

[0022] There are at least two different methods for preparing a composition containing polycarbonate, wherein the Fres content of the composition is generally above the interfacial polycarbonate, but below 360 ppm. The simplest method is just to mix the appropriate amount of molten polycarbonate into the interfacial polycarbonate. This can be achieved by many methods, such as adding only the appropriate proportions of high-Friesian melt polycarbonate and interface polycarbonate to the extruder. The samples (2) and (3) in Example 4 were prepared by this technique. Alternatively, the low-Friesian melt polycarbonate can also be prepared as in Example 2, and any other required ingredients that do not contain unacceptable Friesian ratios can be added. The method for preparing molten polycarbonate having a Fres content of less than 360 ppm is generally described below.

[0023] As mentioned above, the melt method for preparing polycarbonate involves reacting a dihydroxy compound and a c...

Embodiment 1

[0102] Example 1 Preparation of molten polycarbonate with different fres content

[0103] Sample number

Catalyst

Concentration (×10 4 )

(mol / mol BPA)

Fries

Product (ppm)

1

LiOH(2.5)

0.81

2227

2

NaOH(2.5)

0.25

4332

3

KOH(2.5)

0.15

4902

4

CsOH(2.5)

0.042

4500

5

TBPH(25)

0.206

1000

6

Ti(Obu)4

0.17

750

7

HEG(BPA)2

0.90

530

8

1,3,4,6,7,8-hexahydro-1-

Methyl-2H-pyrimdo[1,

1-a]pyrimidine

0.41

150

[0104] HEG(BPA) 2 It is hexaethylguanidine double BPA salt, and TBPH is tetrabutyl phosphonium hydroxide or BPA salt.

[0105] The following describes how to exactly prepare sample 5 in Table 1. The remaining samples were prepared by another identical procedure using another catalyst in Table 1.

[0106] ...

Embodiment 2

[0110] Example 2 Preparation of molten polycarbonate with less than 360 ppm of fres

[0111] The polycarbonate was prepared by the melt synthesis method using the catalyst in Table 2.

[0112] Table 2-Melted polycarbonate with very low Fres content

[0113] Sample number

Catalyst

Catalyst concentration

Mn

Fries

280℃

310℃

280℃

310℃

1

NaOH

1.0×10 -6 M

7419

9696

145

471

2

NaH X PO 3

1.0×10 -6 M

6626

9380

47

163

3

NaHPO 4

1.0×10 -6 M

2240

7414

＜25

262

4

K 2 SO 4

1.0×10 -6 M

1542

2645

＜25

283

5

KH 2 PO 4

1.0×10 -6 M

1907

9277

＜25

277

6

CsH 2 PO 4

1.0×10 -6 M

7983

10676

119

184

7

Cs 2 SO 4

1.0×10 -6 M

8790

10127

238

248

[01...

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Abstract

The present invention provides a composition comprising polycarbonate wherein the polycarbonate has a very low Fries content (e.g., above 5 ppm and below 360 ppm). The present invention also provides a polycarbonate having a very low Fries content which is made by the melt process. This polycarbonate has high ductility and high impact strength. The invention also provides a method for making these compositions. Another aspect of the invention is an optical disk comprising polycarbonate having a very low Fries content which is made by the melt process. Such optical disks resist breakage due to bending.

Description

Background of the invention [0001] The present invention relates to a composition containing polycarbonate, wherein the polycarbonate has a low content of special branching substances. These branched substances are represented by the following general formula (I), and are generally referred to as "Fries" ("Fries") branched substances (hereinafter referred to as "Fries"). More specifically, the present invention relates to a low-Fries polycarbonate prepared by a melt synthesis method. The present invention further relates to an optical disc containing the low-Friesian polycarbonate, and an injection molding method using the polycarbonate. [0002] Conventional industrial equipment synthesizes polycarbonate by mixing an aqueous solution of a dihydroxy compound (such as bisphenol A) and an organic solvent (such as methylene chloride) containing a carbonyl halide (such as phosgene). Once the immiscible organic phase and the water phase are mixed, the dihydroxy compound and carbonyl ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/00C08G64/06C08G64/20C08G64/30C08L55/02C08L69/00G11B7/24047G11B7/2534G11B7/26
CPCC08G64/307G11B7/2534G11B7/2533G11B7/26C08G64/06
Inventor H·伊施达K·伊施瓦M·奥卡穆拉T·施默达T·L·赫克斯H·H·M·豪特M·M·马卢甘P·J·麦克洛斯基小J·A·金小P·M·斯米格尔斯基
Owner SABIC GLOBAL TECH BV