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Transparent Materials

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*12/03/2013 
from 5/16/2012

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Patents with Abstracts

13. Transparent EMF Shielding

U.S. Patent 8,535,810 (September 17, 2013), “Transparent Plastic Film for Shielding Electromagnetic Waves and Method for Producing a Plastic Film of this Type,” Matthias Fahland, Tobias Vogt, Nicolas Schiller, Waldemar Schoenberger, Steffen Guenther, and John Fahlteich (Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., Munich, Germany).

Modern technologies such as mobile radio telephones, satellite television, microwave technology and radar generate electromagnetic fields which can affect living structures including humans.  Protection is based on absorption and reflection.  Most protective materials are filled and opaque.  However, many modern devices require transparency.  Fahland et al developed a a transparent plastic EMF shield based on an adherent laminate.  One example is a polyethylene terephthalate (PET) transparent film attached to a laminate of very thin 5 to 29 nm silver layer between two,  2 to 50 nm niobium oxide layers formed by sputtering.  The oxide layers absorb the radiation and the silver conducts away the radiation.

12. 8,490,348 
Varied glass density reinforcement of composites 

The strength and stiffness of optical composite materials is a function of the quantity and strength of the glass fiber or ribbon in the materials and the optical distortion is a function of the glass in the material.  Ultimately, the quantity of glass that is acceptable for many applications may be limited by the optical performance of the system.  Therefore, an alternate method of improving the strength and stiffness of composite materials may be desirable.

Wilenski, Markus and Godby of The Boeing Company, Chicago, Illinois, developed a transparent reinforced composite material based on a balance .of low-density material  region including a first plurality of glass elements having a first packing density and high density glass reinforced materials.  The polymers can be epoxy; polymethyl methacrylate (acrylic); polycarbonate and other transparent polymers.

11. 8,512,870 
Transparent resin for encapsulation material and electronic device including the same

A light emitting element such as a light emitting diode (LED), an organic light emitting diode (OLED) device, a photoluminescent (PL) device, and the like may be used in diverse areas, such as a domestic electric device, a lighting device, a display device, various automatic devices, and the like.

Shin et al of Cheil Industries, South Korea,  developed a transparent resin for an encapsulating LEDs based on a polymetallosiloxane from at least metal compounds. 

(RDC 8/26/2013)

10. 8,466,245 
 Polymerisable mass with cross-linking nanoparticles 

Pure crosslinked polyacrylates have only a comparatively low strength. The mechanical properties of polymers can be improved by means of fillers. Owing to the comparative ease with which acrylate ester groups can be hydrolysed, only a few fillers, for example carbon black, can be used in polyacrylates. However, this impairs the frequently desired transparency of polyacrylates.

Langerbeins, Kuhner and  Siol of Nanoresins AG, Germany, developed a polymerizable composition containing: a. acrylates and/or methacrylates which have a glass transition temperature Tg of 0 C. or less, b. from 0.5 to 70 wt% SiO2 particles which have an average particle size of from 1 to 150 nm and have polymerizable groups on the surface and are present in dispersed form in the acrylates and/or methacrylates, with at least 50% of the SiO2 particles being individual unaggregated or unagglomerated primary particles, where the composition contains not more than 2% by weight of crosslinker molecules. The resulting elastomers have good mechanical properties such as a high elongation to break. At the same time, they are completely transparent since the nanofillers used according to the invention have no adverse effect on the transparency.

9. 8,409,385 
Transparent laminate and process for producing the same 

A transparent laminate is known, which is produced by laminating a pair of transparent substrates via a thermoplastic resin film of e.g. polyvinyl butyral (PVB) or a thermocrosslinkable transparent resin film while the transparent substrates are heated and pressurized by an autoclave, and when the transparent substrates are glass substrates, the laminate is known by the name of laminated glass. Such a laminated glass is used as a windshield glass for automobiles since it has a merit that fragments of broken glass are adhered to the film without scattering, and it is also used as a window glass (safety glass or security glass) of buildings since it is hard to be penetrated and is excellent in strength.

However, in terms of the process for producing the transparent substrate using the above mentioned transparent resin film, there are such problems that a high temperature environment of at least 70.degree. C. or at least 120.degree. C. is required and that since a high pressure of at least 10 atm is required, the production presents a major impact on the environment. Further, for the same reason, there is also a problem that a transparent substrate easily deformable by heat, such as a transparent resin substrate, cannot be used as the transparent substrate. Further, there is also a problem that when a transparent resin film is cut into a size of the transparent substrate, since trimmed films are wasted as unnecessary films, utilization efficiency of the transparent resin film is poor.

Ito, Niiyama and Kikuchi of Asahi Glass Company,Japan, developed a  transparent laminate by preparing a pair of transparent substrates, forming a sealing portion along the periphery on one of the transparent substrates for sealing a curable resin composition, supplying the curable resin composition in a region on the transparent substrate surrounded by the sealing portion, overlaying the other transparent substrate on the supplied curable resin composition in a reduced pressure atmosphere so that the curable resin composition is sealed as it is sandwiched between the pair of transparent substrates, and subsequently curing the curable resin composition in an atmosphere having a higher pressure than the pressure of the atmosphere in which the composition is sandwiched, to produce the transparent laminate.

8. 8,372,504 
Transparent composite compound 

Bae et al of the Korea Advanced Institute of Science and Technology, South Korea,  developed a non-hydrolytic transparent composite with excellent transparency, heat resistance and a low thermal expansion coefficient.  This includes a glass filler dispersed in a crosslinked transparent resin produced by a non-hydrolytic reaction.  The non-hydrolytic transparent siloxane resin is a resin having Si--O (siloxane) bonds, a resin having at least one kind of heterometal bonds, including Si--O bonds.  When the transparent siloxane resin produced by a non-hydrolytic reaction forms a composite in combination with the glass filler, the composite shows high transparency and heat resistance, as well as a low thermal expansion coefficient. Therefore, the transparent composite composition is useful as a substrate for thin film transistor (TFT) devices, display devices and optical devices.  (RDC 2/19/2013)

7. 8,367,757 
Polymer composite material, optical material including the same, and thermoplastic aromatic polymer 

Imai and Terahara of the National Institute of Advanced Industrial Science Technology, Japan, developed a new thermoplastic aromatic polymer in which metal oxide particles can be uniformly dispersed even without any special functional group in the polymer, and provides a high-performance polymer composite material including the thermoplastic aromatic polymer. A polymer composite material of the present invention includes: a polymer matrix including a thermoplastic aromatic polymer having both an ester bond and an ether bond; and metal oxide particles dispersed in the polymer matrix. (RDC 2/13/2013)

6. 8,278,382 
Method for preparing a transparent polymer material including mineral nanoparticles with a shape factor strictly higher than 1.0
 
Boucher et al of Renault S.A.S. and Essilor International, France, formed transparent polymer materials by  steps i) and ii) in any order, the steps consisting in: i) mixing: mineral nanoparticles having a form factor strictly greater than 1.0; and a polymer matrix comprising a quantity of at least 80% by weight of a polycarbonate (PC) first thermoplastic polymer and of a second transparent thermoplastic polymer other than the first thermoplastic polymer, in order to obtain a mixture; and ii) heating the polymer matrix to the molten state, on its own or in the mixture; to obtain the transparent, polymer material, the mixture of step i) comprising a quantity of mineral nanoparticles having a form factor strictly greater than 1.0 that is strictly less than 5% by weight. (RDC 10/9/2012)

5. 8,241,752 
Transparent conductive articles and methods of making same
 
Bright of 3M, Minnesota, developed a lightweight, coated, flexible, plastic substrate for OLED displays.  The layer has both a low enough resistance to function as an electrode for the display, and low oxygen and moisture permeability.  The display is thereby protected from oxygen and moisture degradation.  The barrier material includes at least one of a thin metallic film, an organic polymer, a thin transparent dielectric, a thin transparent metal nitride, and a thin transparent conductive oxide. The conductive material includes at least one of a thin transparent conductive oxide, a thin transparent metallic film, and a thin transparent metal nitride. Preferably, a multilayer polymer base coat is deposited over the substrate to exclude moisture and atmospheric gases. (RDC 8/24/2012)

4. 8,232,349 
Transparent thermoplastic resin and method for preparing the same
 
Hong et al of Cheil Industries Inc., South Korea, developed a transparent thermoplastic resin consisting of a rubber phase including an aromatic rubbery block copolymer resin, and a resin phase including a terpolymer with an aromatic vinyl compound, a vinyl cyanide compound and an unsaturated alkyl ester compound.  The rubber phase and the resin phase have a co-continuous phase structure. (RDC 8/11/2012)

3. 8,232,342 
Transparent ABS resin composition having excellent impact strength and flowability
 
Jin et al of Cheil Industries Inc., South Korea, developed a transparent ABS material having excellent impact resistance and flowability, which comprises about 10 to about 50 parts by weight of a rubber/(meth)acrylate-aromatic vinyl-unsaturated nitrile graft copolymer; about 50 to about 90 parts by weight of a thermoplastic resin matrix; and about 0.2 to about 0.5 parts by weight of a fluidizer, per 100 parts by weight of a base resin comprising the rubber/(meth)acrylate-aromatic vinyl-unsaturated nitrile graft copolymer and the thermoplastic resin matrix. (RDC 8/11/2012)

2. 8,138,251 
Supertransparent high impact strength random block copolymer
 
Pezzutti  et al of Lummus Novolen Technology, Germany, developed a high impact strength random block copolymer including (a) 65-97 wt% of a crystalline propylene/ethylene copolymer A containing from 0.5 to 6 wt% derived from ethylene and from 94 to 99.5 wt% derived from propylene, and (b) 3-35 wt% propylene/ethylene copolymer B containing from 8 to 40 wt% ethylene and 60 to 92 wt% propylene. The crystalline to amorphous ratio Lc/La of the random block copolymer is1.00 to 2.25. The random block copolymer is characterized by both high toughness and low haze. (RDC 5/16/2012)

1. 8,138,243 
Use of UV absorbers in the production of transparent polyamide molded parts
 
Buhler and Meyer Zu Westram of EMS, Switzerland, used an UV absorber in the transparent polyamide products or polyamide molded parts. This UV absorber must have a substituted benzoyl group.  The result is that such polyamide melts molding compounds leave no visible blooming on surfaces during processing of polyamide products.  UV absorbers in the form of a dibenzoylmethane compound and/or an aminohydroxybenzoyl benzoic acid ester are preferred.  (RDC 5/16/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 5/16/2012.