18IPC010up.txt
受験番号：18IPC010============================================================================
問１[Scope of Claims][Claim 1]
A method for producing an extruded styrene-based resin foam, comprising
extrusion-foaming a styrene-based resin by using a blowing agent, wherein
the styrene-based resin foam contains 1 to 6 parts by weight of a flame
retardant relative to 100 parts by weight of the styrene-based resin, the flame
retardant being (A) a bromine-containing flame retardant mixture oftetrabromobisphenol-A-bis(2,3-dibromo-2-methylpropyl ether) andtetrabromobisphenol-A-bis(2,3-dibromopropyl ether) or (B) a bromine-containing
flame retardant mixture of tetrabromobisphenol-A-bis(2,3-dibromo-2-methylpropylether) and tris(2,3-dibromopropyl) isocyanurate,
the content of the tetrabromobisphenol-A-bis(2,3-dibromo-2-methylpropylether) in the bromine-containing flame retardant mixture is 25% by weight to 75%
by weight, where the total amount of the bromine-containing flame retardant
mixture is taken as 100% by weight, andthe foam containing cells having cell diameters of 0.2 mm or less andcells having cell diameters of more than 0.2 mm and 1 mm or less.
[Claim 2]
The method for producing an extruded styrene-based resin foam according
to claim 1, whereina composition is prepared in advance by mixing the bromine-containing
flame retardant mixture, a phosphorus-containing stabilizer, and other additives
with the styrene-based resin and then melting the mixture with heating, andthe composition is fed to an extruder and again melted with heating.
問２[Background Art]
[0002] Recently, wearers of soft contact lenses (SCL) have been increasing. Ingeneral, when soft contact lenses are worn, the amount of oxygen supplied fromthe atmosphere decreases, which results in mitotic inhibition of corneal
epithelial cells or thickening of the cornea in some cases. For this reason,
soft contact lenses having increased oxygen permeability have been developed.
In view of this background, silicone hydrogel contact lenses have beendeveloped recently as soft contact lenses having high oxygen permeability. By
combining silicone with hydrogel, the silicone hydrogel contact lenses achieve
oxygen permeability several times as high as those achieved by conventionalhydrogel contact lenses. These soft contact lenses vary in terms of thepresence or absence of ionicity, the degree of water content, etc, depending on
their materials. Hence, it is important that an eye drop preparation to beapplied to the eyes of wearers of soft contact lenses should be designed
according to characteristics of the soft contact lenses.
問３
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18IPC010up.txt[Embodiment]
A barrier layer is made of a silicon compound. Specific examples of thesilicon compound include silicon oxide, silicon nitride, silicon carbide,silicon oxynitride, etc. In the present invention, it is particularlypreferable to use silicon nitride. The use of silicon nitride makes it possible
to form the barrier layer as a dense film, and hence the barrier layer can beformed thinner with desired gas-barrier properties.
In addition, a silicon nitride film has a nature of being more colored
and less transparent with the increase in thickness. Since the barrier layer isused in combination with a seal film and an adhesive layer described later inthe present invention, the barrier layer can be thinner than a barrier layer ina conventional structure using only the barrier layer, and the barrier layer canhave a good transparency. Hence, the barrier layer can be suitably applied to a
top emission type organic EL element.
The thickness of the barrier layer is not particularly limited, as longas the barrier layer having such a thickness can protect an organic EL layer
against oxygen, water vapor, and the like penetrating through the adhesivelayer.
問４[Example](1) Preparation of Graft Copolymer
To a reaction vessel equipped with a thermometer, a stirrer, an nitrogen
inlet, and a condenser, 25 parts by weight of polyvinyl butyral (polymerization
degree: 1700, butyralization degree: 68.0% by mole, hydroxy group content: 30.8%
by mole, and acetyl group content: 1.2% by mole), 25 parts by weight of isobutyl
methacrylate, and 100 parts by weight of ethyl acetate were added, and the
polyvinyl butyral was dissolved with stirring. Next, nitrogen gas wasintroduced into the reaction vessel for 30 minutes to purge the inside of thereaction vessel with nitrogen. Then, while the inside of the reaction vessel
was being stirred, the temperature was raised to 75 degrees Celsius by heating.
Thirty minutes later, a polymerization initiator solution obtained by diluting
0.5 parts by weight of t-hexyl peroxypivalate as a polymerization initiator with
16 parts by weight of ethyl acetate was added dropwise to the reaction vessel
over 5 hours. After that, the reaction was further allowed to proceed at 75
degrees Celsius for 3 hours. Subsequently, the reaction liquid was cooled toobtain a graft copolymer solution containing a graft copolymer and having asolid content of 30% by weight.

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