Method for the preparation of a silicon-containing polysulfide-type polymer
AssigneeDow Corning Toray Co., Ltd.
InventorsTakeaki Saiki, Makoto Iwai
Life of this patent
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Abstract
To provide a highly efficient and stable method for the preparation of a silicon-containing polysulfide-type polymer, in particular, a polysulfide-type polymer with organosilyl groups, the method being carried out without generation of by-products that could have high impact on the environment. A method for the preparation of a silicon-containing polysulfide-type polymer characterized by mixing (A) a silicon-containing compound having a silicon atom-bonded monovalent organic group having an aliphatic unsaturated bond; (B) a polysulfide polymer with at least two mercapto groups in one molecule; and (C) an organic base or ammonia; the mixing being carried out in the presence of (D) sulfur.
Claims10
A method for the preparation of a silicon-containing polysulfide-type polymer characterized by mixing (A) a silicon-containing compound having a silicon atom-bonded monovalent organic group with an aliphatic unsaturated bond;
- (B) a polysulfide polymer with at least two mercapto groups in one molecule;
- and (C) an organic base or ammonia;
- said mixing being carried out in the presence of (D) sulfur.
A method for the preparation of a polysulfide-type polymer having an organosilyl group represented by the following formula (4):
- [wherein R1, R2, R3, “a” and “n” are the same as defined below, R4 is a residue formed in an addition reaction of the aliphatic unsaturated bond contained in below-defined R5 of formula (1) of component (A) given below to a hydrogen atom of the mercapto group of below-given component (B), and “x” is a number which on average is greater than 1 and smaller than 8 or equal to 8], said method characterized by mixing:
- (A) an organosilane or mixture of oragonosilanes represented by the following formula (1):
- where R1 is an alkoxyalkylene group or a monovalent hydrocarbon group with 1 to 10 carbon atoms, R2 is a monovalent hydrocarbon group, other than the one having 1-15 carbon atom aliphatic unsaturated bonds, R5 is a monovalent hydrocarbon group with 2 to 16 carbon atoms having aliphatic unsaturated bonds, and “a” is an integer between 0 and 3;
- (B) a polysulfide polymer having molecular terminals capped with mercapto groups, which is expressed by the following formula (2):
- HSR3(SyR3)nSH (2)
- [where R3 is selected from an alkylene group with 2 to 10 carbon atoms, an arylene group with 6 to 10 carbon atoms, an alkylenoxyalkylene group with 2 to 10 carbon atoms, or a divalent organic group of formula (3):
- —R8(OR8)m— (3)
- (where R8 are the same or different alkylene groups with 1 to 10 carbon atoms, and “m” is an integer between 2 and 20), and a hydroxy-substituted alkylene group with 3 to 12 carbon atoms;
- “y” is a number with a mean value between 1.7 and 2, and “n” is a number with a mean value between 1 and 120], said component (B) being used in an amount of 10 to 200 mole % relative to said component (A);
- (C) a nitrogen-containing organic base used in an amount of 0.01 to 10 mole % relative to said component (A);
- and
- (D) sulfur used in such an amount that sulfur atoms constitute 1 to 600 mole % relative to 1 mole of the repeating units (SyR3) in said component (B).
Dependencies are inferred from the claim text.