hereinafter , the present invention will be described in detail with reference to examples according to the present invention and comparative examples not according to the present invention , but the scope of the present invention is not limited to the following examples . in the specification , the following measurement method will be applied to measure physical properties . ft - ir analysis was performed with respect to fillers prepared in example and comparative example using an ft - ir analyzer ( fts 3000 , bio - rad ). in the analyzed ft - ir spectrum , a peak caused by a stretching movement of a methoxy group of methoxysilyl ( si — och 3 ), which is a hydrolyzable group , introduced to an olefin polymer was observed at 1091 cm − 1 , and a peak caused by a stretching movement of a hydroxyl group of a reactive functional group ( si — oh ) produced by hydrolyzing the hydrolyzable group was observed at 3645 cm − 1 . accordingly , an intensity of the peak observed at 1091 cm − 1 , an intensity of the peak observed at 720 cm − 1 and an intensity of the peak observed at 3645 cm − 1 were put to equations 3 and 4 obtained from equations 1 and 2 , thereby calculating indices of the hydrolyzable group and the reactive functional group . fig3 is an ft - ir analysis graph according to example 1 . index of hydrolyzable group =( peak intensity at 1091 cm − 1 )/( peak intensity at 720 cm − 1 ) [ equation 3 ] index of reactive functional group =( peak intensity at 3645 cm − 1 )/( peak intensity at 720 cm − 1 ) [ equation 4 ] a filler was cut to a sample having a size of 15 mm ( length )× 200 mm ( width ). the sample was adhered to a glass plate by compressing the sample using a vacuum laminator ( icolam produced by meier ) at 150 ° c . for 10 minutes . afterwards , the adhered filler was peeled off using a tension tester ( leplus produced by lloyd ) at a peel rate of 50 mm / min and an angle of 90 degrees , there by measuring a peel strength . the glass plate may be a glass plate commonly used as a light - receiving substrate of a photovoltaic cell module . a filler was cut to a sample having a size of 10 mm ( length )× 10 mm ( width ). subsequently , the sample was kept in water of 90 ° c . for 18 hours . then , the gel fraction of the filler was measured according to astm d - 2765 . the remaining amount of the catalyst in a filler after a photovoltaic cell module was manufactured was measured using an hplc apparatus ( alliance 2690 , detector : pdl produced by waters ) according to a manual of the manufacturer . 98 parts by weight of polyethylene having a density of 0 . 880 g / cm 3 and mfr at 190 ° c . of 5 g / 10 min , 2 parts by weight of vinyl trimethoxy silane and 0 . 1 parts by weight of dicumyl peroxide were mixed in an extruder , melted and stirred at 200 ° c ., thereby grafting the vinyl trimethoxy silane to the polyethylene . in addition , 100 parts by weight of low - density linear polyethylene having a density of 0 . 870 g / cm 3 , 4 parts by weight of a hindered amine photostabilizer , 2 parts by weight of a benzophenone uv absorber , 2 parts by weight of phosphorous thermal stabilizer and 1 part by weight of dodecyl amine ( c 12 h 25 nh 2 ) were mixed , and melt - processed , thereby forming a master batch in a pellet . then , 10 parts by weight of the master batch was input to the extruder using a side feeder , relative to 100 parts by weight of polyethylene to which the vinyl trimethoxy silane was grafted , and then mixed together , thereby preparing an olefin composition . subsequently , the composition was input to a side hopper of a film molding device having a twin - screw extruder ( φ 27 mm ) and a t dice ( width : 500 mm ), and processed at an extrusion temperature of 200 ° c . and a take - out rate of 3 m / min , thereby obtaining a sheet - shaped filler having a thickness of approximately 500 μm . a glass plate having a thickness of approximately 3 mm , a prepared filler , a crystal silicon wafer photovoltaic element and a back sheet ( a sheet formed by laminating a polyvinyl fluoride sheet ( thickness : 38 μm ), an aluminum thin film ( thickness : 30 μm ) and a polyvinyl fluoride sheet ( thickness : 38 μm )) were sequentially laminated , and compressed using a vacuum laminator at 150 ° c . for 15 minutes , thereby manufacturing a photovoltaic cell module . a filler and a module were manufactured by the same method as described in example 1 , except that 1 part by weight of butyl amine ( c 4 h 9 nh 2 ) was used , instead of 1 part by weight of dodecyl amine ( c 12 h 25 nh 2 ), in preparation of the master batch . a filler and a photovoltaic cell module were manufactured by the same method as described in example 1 , except that 1 part by weight of dibutyl dilaurate ( dbtdl ) was used , instead of 1 part by weight of dodecyl amine ( c 12 h 25 nh 2 ), in preparation of the master batch . a filler and a photovoltaic cell module were manufactured by the same method as described in example 1 , except that dodecyl amine ( c 12 h 25 nh 2 ) was not used in preparation of the master batch . analysis results for examples and comparative examples are summarized in table 1 . for a filler ( sample 1 ) of the photovoltaic cell module prepared in example 1 , a filler ( sample 2 ) of the photovoltaic cell module prepared by the same method as described in example 2 except that 10 parts by weight of butyl amine ( c 4 h 9 nh 2 ) was used in the master batch , a filler ( sample 3 ) of the photovoltaic cell module prepared by the same method as described in comparative example 1 except that 10 parts by weight of dbtld was used in the master batch and a filler ( sample 4 ) of the photovoltaic cell module prepared in comparative example 2 were used , amounts of remaining basic hydrolyzable catalysts were measured , and the results are shown in table 2 with peel strengths and gel fractions . from the results shown in table 2 , it was confirmed that physical properties including adhesion can be effectively realized and modulated by modulating an amount of the remaining basic hydrolyzable catalyst in the filler after modulation . according to the present invention , an olefin composition which can be effectively used as a filling material can be provided .