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Branched polycarbonate produced by reactive extrusion

A technology of polycarbonate resin and reaction, applied in the field of reaction extrusion to prepare branched polycarbonate, which can solve the problems of time-consuming and expensive

Inactive Publication Date: 2004-08-04
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter, the synthetic route, is time-consuming and expensive

Method used

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  • Branched polycarbonate produced by reactive extrusion
  • Branched polycarbonate produced by reactive extrusion
  • Branched polycarbonate produced by reactive extrusion

Examples

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preparation example Construction

[0069] The preparation of the compositions of the present invention may be accomplished using any of the known blending operations employed for blending thermoplastics, for example blending in a kneader such as a Banbury mixer. Blending can be performed continuously or batchwise.

[0070] After melt extrusion, branching and crosslinking reactions occur in the polycarbonate resin melt.

[0071] The minimum temperature of the melt extrusion reaction should be high enough to generate a melt of the reactants. Such temperatures are achieved in an extruder, or molding machine such as an injection or compression molding machine commonly used for extrusion or molding of polycarbonate.

example 1

[0079] Provide a quantity of linear polycarbonate resin selected from one of the following:

[0080] A. PC135 line type, M w 35000g / mol (main part), or

[0081] B.PC605 linear, soft segment copolymerization-polycarbonate, comprising 10mol% dodecanedioic acid (C 10 Aliphatic series, more sensitive to free radicals).

[0082] As a comparative example, a third resin (branched resin C.PC195) was provided.

[0083] The reference branched resin C.PC195 was supplied by General Electric Company (Pittsfield, MA). This particular resin was prepared directly by synthesis and contained 0.3 mol% tris(4-hydroxyphenyl)ethane as branching agent. This material is mixed in the melting extruder (corotating twin-screw extruder, machine barrel length 950mm, screw rod length 951mm), and mixing condition is, the vacuum degree of 0.5 atmospheric pressure; Rotating speed, 300RPM; Temperature curve from 200 to 300°C.

[0084] Resin A was mixed under the same mixing conditions as described for Re...

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Abstract

Polycarbonate can be branched by reactive extrusion using free radical chemistry. This technology combines the effect of free radical initiator and branching agent on polycarbonate during processing. Melt Strength of polycarbonate can be increased by addition of a triacrylate as branching agent and peroxide as radical initiator.

Description

technical field [0001] This invention relates to polycarbonate resins and their use in article molding. Background technique [0002] Aromatic polycarbonate resins are a well-known class of synthetic polymer resins, typically prepared from the reaction between polyhydric phenols and carbonate precursors; see US Patent 3,028,365. While such resins have been found to perform thermoplastic molding over a wide range of molding conditions, only selected polycarbonate resin compositions are useful for blow molding. This is due to the special requirements for thermoplastic resins used in blow molding operations; see for example US Patents 4,286,083 and 4,621,132 for branched polycarbonate resins. Branched polycarbonate resins differ from most molding thermoplastic polymers in their melt rheological behavior. Most thermoplastic polymers exhibit non-Newtonian flow characteristics over substantially all ranges of melt processing conditions. However, unlike most thermoplastic polyme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/14C08G64/42
CPCC08G64/42C08G64/14
Inventor R·梅斯坦扎T·L·赫克斯J·J·德邦特
Owner SABIC INNOVATIVE PLASTICS IP BV