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Transparent thermoplastic blend of a cycloolefin copolymer and a thermoplastic polyurethane

Inactive Publication Date: 2005-03-31
LUBRIZOL ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Blends of cycloolefin copolymers and thermoplastic polyurethanes (TPU) are also provided which have excellent physical properties and can be made to have electrical dissipative properties by the selection of the TPU. The cycloolefin copolymers are also blended with other inherently dissipative polymers (non-TPU) to give electrical dissipative properties. Examples of other IDP polymers which are blended with the cycloolefin copolymers include polyether amides, polyether esters, copolymers of ethylene oxide and propylene oxide, and copolymers of ethylene oxide and epichlorohydrin.

Problems solved by technology

However, the blends are generally not transparent.
This class of IDP polymers is transparent, but suffers from high resistivity, slow static decay times and high off-gassing of volatile impurities, making it less desirable for sensitive electronic handling applications.

Method used

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  • Transparent thermoplastic blend of a cycloolefin copolymer and a thermoplastic polyurethane
  • Transparent thermoplastic blend of a cycloolefin copolymer and a thermoplastic polyurethane
  • Transparent thermoplastic blend of a cycloolefin copolymer and a thermoplastic polyurethane

Examples

Experimental program
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examples

The ingredients set forth in Tables 1 and 2 (Examples A through P) were blended in a Werner Pfleiderer® model ZSK 30 twin screw extruder under the following general conditions: Rate: 25-35 lbs / hour Rpm: 175 Temperatures (C): Zone 1: 165 Zone 2: 175 Zone 3: 185 Zone 4: 190 Zone 5: 190 Zone 6: 185 Die: 170 Amps: 40

Specimens used for physical, electrical, and cleanliness testing were injection molded.

Luminous transmittance % was tested on a Perkin Elmer Model Lambda® 9 Spectrophotometer. 0.125″ thick samples were scanned from 400-860 m at a rate of 240 nm / min. The light source was a Tungsen-halogen lamp. Slit width was 2 nm and the reference sample was air. Percent transmittance is reported at 700 nm.

Optical properties are determined according to ASTM D-1003 and include light transmission and haze values.

Clear compositions were made according to the following recipes shown in Examples A through J wherein the parts listed are by weight. Additional examples are given ...

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Abstract

A blend of a cycloolefin copolymer and a thermoplastic urethane having similar indices of refraction is transparent. The cycloolefin copolymer is derived from norbornene and other monomers such that it has a processing range compatible with the thermoplastic urethane. The urethane component preferably has a polyether intermediate. A thermoplastic urethane compatibilizing agent is utilized desirably having a hydrocarbon intermediate portion. The compositions can be made to have desirable electrical dissipative properties for static control applications.

Description

FIELD OF INVENTION The present invention relates to a transparent blend of a thermoplastic elastomer such as a polyurethane based inherently dissipative polymer (TPU-IDP), a cycloolefin copolymer, and desirably a compatibilizing agent. More specifically, the present invention relates to a clear blend wherein the indices of refraction of the thermoplastic polyurethane and the cycloolefin are similar. The present invention also relates to blends of thermoplastic polyurethanes (TPU) and cycloolefin copolymer which are not transparent and to other inherently dissipative polymers and cycloolefin copolymers. BACKGROUND OF THE INVENTION Inherently dissipative polymers (IDPs) are a class of polyether elastomers which have inherent volume resistivity in the 1×105 to 1×1012 ohm-cm. Examples include polyethylene oxide-based polyether urethanes, polyether amides and polyether esters, and copolymers of ethylene oxide such as ethylene oxide / propylene oxide or ethylene oxide / epichlorohydrin. IDP...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L65/00C08L75/08
CPCC08L23/0823C08L65/00C08L75/08C08L2666/20C08L2666/06C08L23/00C08L75/04C08L23/08
Inventor LUDLOW, JAMES M. III
Owner LUBRIZOL ADVANCED MATERIALS INC
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