Method of preparing silicon compositions
First Claim
1. A method of preparing a uniform silicone composition, comprising treating under the application of a shearing force a polymeric product obtained by addition polymerization of (A) on organohydrogenpolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded hydrogen atoms on average, said silicon-bonded hydrogen atoms being in an amount of from 1 to 20 mol %, based on the total of the silicon-bonded hydrogen atoms and silicon-bonded organic groups in the molecule;
- and (B) an organopolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded aliphatic unsaturated groups on average;
in the presence of from 10 to 1,000 parts by weight of low-viscosity silicone oil having a viscosity of not more than 100 cSt at 25°
C. based on 100 parts by weight of the total amount of said (A) and (B).
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Abstract
A method of preparing a uniform silicone composition, comprising treating under the application of a shearing force a polymeric product obtained by addition polymerization of (A) an organhydrogenpolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded hydrogen atoms on average, said silicon-bonded hydrogen atoms being in an amount of from 1 to 20 mol %, based on the total of the silicon-bonded hydrogen atoms and silicon-bonded organic groups in the molecule; and (B) an organopolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded aliphatic unsaturated groups on average; in the presence of from 10 to 1,000 parts by weight of low-viscosity silicone oil having a viscosity of not more than 100 cSt at 25° C. based on 100 parts by weight of the total amount of said (A) and (B).
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Citations
16 Claims
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1. A method of preparing a uniform silicone composition, comprising treating under the application of a shearing force a polymeric product obtained by addition polymerization of (A) on organohydrogenpolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded hydrogen atoms on average, said silicon-bonded hydrogen atoms being in an amount of from 1 to 20 mol %, based on the total of the silicon-bonded hydrogen atoms and silicon-bonded organic groups in the molecule;
- and (B) an organopolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded aliphatic unsaturated groups on average;
in the presence of from 10 to 1,000 parts by weight of low-viscosity silicone oil having a viscosity of not more than 100 cSt at 25°
C. based on 100 parts by weight of the total amount of said (A) and (B). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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5. The method according to claim 1, wherein said organopolysiloxane (B) has the formula:
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space="preserve" listing-type="equation">[(CH.sub.2 ═
CH)(CH.sub.3).sub.2 SiO.sub.0.5 ].sub.e [(CH.sub.3).sub.3 SiO.sub.0.5 ].sub.f
space="preserve" listing-type="equation">[(CH.sub.3).sub.2 SiO].sub.g [(CH.sub.2 ═
CH)CH.sub.3 SiO].sub.hwherein, e and f are each an integer of from 0 to 2, provided that e+f=2, g is an integer from 0 to 500 and h is an integer of from 0 to 50.
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6. The method according to claim 1, wherein said low-viscosity silicone oil has a viscosity of not more than 50 cSt at 25°
- C.
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7. The method according to claim 1, wherein said low-viscosity silicone oil has a viscosity of not more than 10 cSt at 25°
- C.
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8. The method according to claim 1, wherein said organohydrogenpolysiloxane (A) is in the form of a mixture of compounds.
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9. The method according to claim 1, wherein said organopolysiloxane (B) is in the form of a mixture of compounds.
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10. The method according to claim 1, wherein a molar ratio of silicon-bonded hydrogen atoms of (A) to the silicon-bonded aliphatic unsaturated groups of (B) is from 1/3 to 3/1.
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11. The method according to claim 1, wherein said low-viscosity silicone oil is a siloxane having a low degree of polymerization selected from the group of methylpolysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane, ethylpolysiloxane, ethylmethylpolysiloxane, ethylphenylpolysiloxane, octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane and mixtures thereof.
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12. The method according to claim 1, which further comprises effecting said reaction in the presence of a platinum compound or a rhodium compound, as a catalyst, in a solvent.
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13. The method according to claim 1, wherein said compound (A) is selected from the group consisting of trimethylsilyl-terminated dimethylmethylhydrogenpolysiloxane, dimethylhydrogensilyl-terminated dimethylpolysiloxane and trimethylsilyl-terminated dimethylmethylhydrogenpolysiloxane.
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14. The method according to claim 1, wherein said compound (B) is selected from the group consisting of dimethylvinylsilyl-terminated dimethylpolysiloxane and trimethylsilyl-terminated dimethylmethylvinylpolysiloxane.
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15. The method according to claim 1, wherein said low-viscosity silicone oil is selected from the group consisting of phenyltris(trimethylsiloxy) silane and octamethyltrisiloxane.
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16. The method according to claim 1, wherein said catalyst is chloroplatinate.
- and (B) an organopolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded aliphatic unsaturated groups on average;
Specification