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Translucent thermoplastic composition, method for making the composition and articles molded there from

a thermoplastic composition and transparent technology, applied in the field of thermoplastic compositions comprising polycarbonate polymers, can solve the problems of reducing the impact strength of materials, affecting the appearance of finished products,

Active Publication Date: 2006-01-19
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes several embodiments of a thermoplastic composition that includes a matrix of polycarbonate polymer with embedded polysiloxane domains. The composition can be obtained by blending two different types of polycarbonate / poly(diorganosiloxane) copolymers. The composition has a unique light transmittance and haze, making it useful in various applications such as optical components and lighting fixtures. The technical effects of the invention include improved translucency, reduced light scattering, and improved optical properties.

Problems solved by technology

In fact, transparency can be lost upon the addition of even small amounts of rubbery impact modifier.
The inclusion of visual effects additives can often decrease the impact strength of the material.
Additionally, the incorporation of visual effect additives can result in visible flowlines, knitlines or weldlines in the finished product.
Such flowlines, knitlines or weldlines can produce unattractive streaks in the product.

Method used

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  • Translucent thermoplastic composition, method for making the composition and articles molded there from
  • Translucent thermoplastic composition, method for making the composition and articles molded there from
  • Translucent thermoplastic composition, method for making the composition and articles molded there from

Examples

Experimental program
Comparison scheme
Effect test

example i

[0103] A series of compositions has been prepared using the polymeric materials in Table 1.

TABLE 1omponentDescriptionPC / PDMS-1A first polycarbonate / polydimethylsiloxanecopolymer having about 20 weight percentsiloxane based on the total weight of thecopolymer, a absolute weight averagemolecular weight of about 30.000 g / mol, alight transmission of about of about 104.PC / PDMS-2A second polycarbonate / polydimethylsiloxanecopolymer having about 6 weight percentsiloxane based on the total weight of thecopolymer, an absolute weight averagemolecular weight of about 23.500 g / mol, alight transmission of about >80% and a hazeof about 2.PC-1A bisphenol A polycarbonate made by aninterfacial process with an absolute weightaverage molecular weight of about 21.800 g / mol,a light transmission of about 90% anda haze of about 1, obtained from GE Plastics.SANA styrene acrylonitrile copolymer comprisingabout a 75:25 weight ratio of styrene toacrylonitrile and with an weight averagemolecular weight of abo...

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Abstract

A thermoplastic composition comprising a matrix of a polycarbonate polymer in which are embedded polysiloxane domains with an average domain size between 20 and 45 nanometers. Said compositions can be obtained by combining a first polycarbonate / poly(diorganosiloxane) copolymer; with a second polycarbonate / poly(diorganosiloxane) copolymer. A range of translucencies are obtainable by varying the relative amounts of the two copolymers without substantial loss in impact properties.

Description

BACKGROUND OF THE INVENTION [0001] The disclosure relates to a thermoplastic composition comprising polycarbonate polymers. The thermoplastic composition is translucent and has excellent physical properties. The thermoplastic composition comprises a matrix of a polycarbonate polymer in which are embedded polysiloxane domains. [0002] Polycarbonate polymers are transparent engineering thermoplastic materials that combine desirable mechanical, optical, thermal, and electrical properties. Frequently polycarbonate polymers are blended with other materials to improve some mechanical properties such as impact resistance. The resulting blend typically exhibits reduced transparency or even opacity when compared to polycarbonate. In fact, transparency can be lost upon the addition of even small amounts of rubbery impact modifier. There is a growing need for translucent materials. Translucency occupies the middle ground between transparency and opacity, and is generally characterized by a comb...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G64/00C08L83/10
CPCC08L25/12C08L55/02C08L67/02C08L69/00C08L83/10C08L2666/02C08G64/18C08G77/448
Inventor VENDERBOSCH, ROBERT W.GOEDMAKERS, JAN-WILLEMHURST, JEREMY D.
Owner SHPP GLOBAL TECH BV