Platinum group metal catalyst, curable organopolysiloxane composition, and release sheet
A technology of polysiloxane and platinum group metals, applied in adhesives, adhesive additives, film/sheet adhesives, etc., can solve problems such as decreased adhesion, high peeling force, and insufficient hardening reaction , to achieve high storage stability, high catalyst activity, and reduce manufacturing costs
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preparation example Construction
[0029] The preparation method of the catalyst composition is generally a method of adding and mixing predetermined amounts of the i) component, ii) component and, if necessary, the iii) component. The order of addition is not particularly limited, and when adding the above-mentioned iii) component, the method of adding the i) component after uniformly mixing the ii) component and the iii) component in advance is preferable.
[0030] i) The platinum-group metal-based catalyst may be a conventionally known platinum-group metal-based catalyst mainly composed of a platinum-group metal complex. The platinum group metal catalysts are, for example, chloroplatinic acid, alcohol solution or aldehyde solution of chloroplatinic acid, complexes of chloroplatinic acid and various olefins, chloroplatinic acid and vinyl-containing organosilicon Complexes of oxane, etc., complexes of platinum and vinyl group-containing organosiloxane, etc. The platinum group metal atoms refer to platinum ato...
Embodiment 1
[0156] 0.020 parts by mass of the Karlster catalyst with a platinum concentration of 21.5% by mass as the i) component, and the average molecular formula as the ii) component: D A 4 1.98 parts by mass of the indicated cyclic organopolysiloxane having an acrylic group in its side chain was mixed until uniform, and a colorless and transparent platinum catalyst composition (A-1) having a platinum concentration of 0.215 mass % was obtained.
Embodiment 2～7、 comparative example 1～6
[0158] Except changing the composition of Example 1 to the composition (unit: parts by mass) recorded in the following Table 1 or Table 2, repeat the steps of Example 1, mix each component until uniform, and obtain the platinum catalyst composition (A- 2)~platinum catalyst composition (A-7) and platinum catalyst composition (a-1)~platinum catalyst composition (a-6) for comparison.
[0159] [evaluation of storage stability]
[0160] 1 g of the platinum catalyst compositions obtained in Examples 1 to 7 and Comparative Examples 1 to 6 were put into a 5 ml glass bottle and stored in a dryer at 105° C. in a sealed state. The storage stability at high temperature was confirmed by taking out from the drier after 1 hour and observing the change of the external appearance. The results are shown in Table 1 below.
[0161] [Table 1]
[0162]
[0163] [Table 2]
[0164]
[0165] As shown in Table 2, the platinum catalyst composition (a-1) in which an organopolysiloxane without a...
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