Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-07-23
1983-03-01
Marquis, Melvyn L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523213, 524406, 528 15, 528 24, 528 31, 528 32, C08K 906
Patent
active
043755232
ABSTRACT:
There is provided herein a curable silicone elastomer composition comprising the following components: (A) 100 parts by weight of a polyorganosiloxane having at least two silicon-bonded vinyl groups per molecule, (B) 1 to 300 parts by weight of fine powders of tungsten carbide and (C) a component for crosslinking of said component (A) selected from the group consisting of (1) a combination of (a) 0.1 to 10 parts by weight of a polyorganohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule and (b) 0.000001 to 0.1 part by weight of a platinum catalyst; (2) a combination of said (a), (b) and (c) 0.00001 part to less than 0.1 part by weight of an organic peroxide except from organohydroperoxide; (3) a combination of said (a) and (d) 0.00001 part to less than 0.2 part by weight of the reaction product between said (b) and (c); and (4) 0.1 to 3.0 parts by weight of an organic peroxide except from organohydroperoxide. The composition according to the present invention shows excellent X-xay shielding effect as well as excellent anticoagulative effect, and can give an elastomer of high quality by curing with a broad scope of catalyst systems.
REFERENCES:
patent: 3989667 (1976-11-01), Lee et al.
patent: 4256616 (1981-03-01), Hatanaka et al.
patent: 4276252 (1981-06-01), Kreis et al.
Hatanaka Masayuki
Kurita Atsushi
Kusakabe Masahiro
Yokoyama Yoshikane
Marquis Melvyn L.
Tokyo Shibaura Denki Kabushiki Kaisha
Toshiba Silicone Co. Ltd.
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