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Encapsulating Material for Solar Cell

Inactive Publication Date: 2007-11-22
MITSUI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] The present invention provides encapsulating material for solar cells having excellent transparency, heat resistance, flexibility and other properties.
[0021] The present invention provides encapsulating material for solar cells which without requiring the use of any organic peroxide makes possible a significant improvement in the efficiency in the production of solar cell modules and a substantial reduction in the manufacturing cost of solar cell modules.
[0022] According to the present invention, the use of the non-crystalline or low-crystalline α-olefin-based copolymer of the present invention or its composition (I) makes it possible to provide encapsulating material for solar cells that will prevent an occurrence of such troubles as the flow or deformation of the encapsulating material and an impairment of the appearance of the solar cell even when the temperature rises during the use of the solar cell module.
[0023] The present invention provides a solar cell module using the solar cell encapsulating material of the present invention which shows excellent performance. BEST EMBODIMENTS OF THE INVENTION
[0024] An explanation is given of encapsulating material for solar cells comprising the non-crystalline or low-crystalline α-olefin-based copolymer of the present invention or its composition (I).
[0025] Given below are preferable examples of the non-crystalline or low-crystalline α-olefin-based copolymer of the present invention or its composition (I). As the first example, resin composition (C) containing 50 to 100 parts by weight of non-crystalline α-olefin polymer (A) meeting the following requirements (a) through (c) and 50 to 0 parts by weight of crystalline α-olefin polymer (B) (the total of (A) and (B) being 100 parts by weight) can be cited:

Problems solved by technology

However, because of its inadequate heat resistance, it is necessary to use organic peroxide additionally for such ethylene-vinyl acetate copolymer.
In the step of making the sheet, it is necessary to mold the sheet at such low temperature that will not cause the decomposition of the organic peroxide and as a result it is impossible to increase the extrusion rate.
Consequently, it is troublesome and requires much time to produce a solar cell module, which in turn constitutes a factor in increasing the manufacturing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0075] A sheet 0.5 mm in thickness was prepared at a processing temperature of 160° C. by use of a profile extruder (screw diameter: 40 mm; L / D=26; screw full flight: CR=2.6), using a resin composition comprising 85 parts by weight of a non-crystalline propylene polymer and 15 parts by weight of crystalline polypropylene (trade name: Toughcellene T3512; available from Sumitomo Chemical Co.; melt peak as measured by a differential scanning calorimeter; 158° C., JIS A hardness: 56). The physical properties of the resultant sheet were measured. Results are shown in Table 1.

TABLE 1Physical propertiesMeasurement valueHaze (%)6.8Total light transmission (%)83.2Storage elastic modulus (Pa) at 150° C.1.0 × 10660° slanting test (100° C. × 1000 hrs)No slippage / do discloration

example 2

[0076] A sheet 0.5 mm in thickness was prepared at a processing temperature of 160° C. by use of a profile extruder (screw diameter: 40 mm; L / D=26; screw full flight: CR=2.6), using a non-crystalline or low-crystalline propylene-butene copolymer (PBR) (available from Mitsui Chemicals, Inc.; a non-crystalline or low-crystalline α-olefin-based copolymer; trade name: TAFMER XR110T; melt flow rate (ASTM D1238): 3.2 g / 10 min (190° C.), 6.0 g / 10 min (230° C.); melting point: 110° C.; Shore D hardness: 56). The physical properties of the resultant sheet were measured. Results are shown in Table 2.

example 3

[0077] A sheet 0.5 mm in thickness was prepared by the same method as described in Example 1 except that a mixture of the propylene-butene-1 copolymer and an alicyclic tackifier (trade name: Alcon AM-1; available from Arakawa Chemical Co.; softening point: 125° C.) in a weight ratio of 90:10 was used in place of the propylene-butene-1 copolymer of examplel. The physical properties of the resultant sheet were measured. Results are shown in Table 2.

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Abstract

Encapsulating material for solar cells which facilitates fabricating solar cell modules and has excellent transparency, heat resistance, flexibility, etc., and a solar cell modules. More specifically, the present invention provides encapsulating material for solar cells comprising a non-crystalline or low-crystalline a-olefin-based copolymer or its composition (I). In a preferred embodiment, the aforementioned copolymer or its composition (I) is a resin composition (C) containing 50 to 100 parts by weight of non-crystalline α-olefin polymer (A) meeting the following requirements: (a) the α-olefin having 3 to 20 carbon atoms is not less than 20 mol %, (b) practically no melt peak as measured by a differential scanning calorimeter is observed, and (c) the Mw / Mn is not more than 5, and 50 to 0 parts by weight of crystalline α-olefin polymer (B) (the total of (A) and (B) being 100 parts by weight).

Description

TECHNICAL FIELD [0001] The present invention relates to an encapsulating material for solar cells in solar cell modules and solar cell modules using the encapsulating material. More specifically, the present invention is concerned with encapsulating material for solar cells having excellent transparency, heat resistance, flexibility and other properties that makes the formation of solar cell modules easy. BACKGROUND ART [0002] Hydraulic power generation, wind power generation and photovoltaic power generation which make use of inexhaustible natural energy and help reduce carbon dioxide and improve other environmental problems are getting into the limelight. Out of these, the spread of photovoltaic power generation has been making remarkable progress in recent years as the performance of solar cell modules in power generation efficiency and other respects has been making marked improvements while on the other hand their prices have been declining and the national and local government...

Claims

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Application Information

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IPC IPC(8): C08L23/00H01L31/04
CPCC08L23/02C08L23/0815C08L23/10C08L23/14H01L31/0481C08L2312/00H01L31/048Y02E10/50C08L2205/02C08L2666/06C08K5/14C08K5/34924C08L2203/206C08L3/00
Inventor NISHIJIMA, KOICHIYAMASHITA, AKIRA
Owner MITSUI LTD
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