Processes for producing polymers having functional groups

Details Processes for producing polymers having functional groups Processes for producing polymers having functional groups

1998-08-06

2000-09-19

Moore, Margaret G.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525100, 528 12, 528 15, 528 25, 528 31, 524848, 524862, C08L 2322

Patent

active

061213799

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a process for preparing an organic polymer having silicon-containing groups.


BACKGROUND ART

A group containing one or more silicon atoms bound to hydrolyzable groups (e.g. (CH.sub.3 O).sub.2 Si(CH.sub.3)--) is hydrolyzed into silanol when moisture exists, and then forms siloxane bonds. These groups can be called crosslinkable silyl groups. A polymer having crosslinkable silyl groups can be crosslinked and cured by forming siloxane bonds in the presence of moisture. It can be used as sealing compounds and adhesives. ##STR1##
It is known that the crosslinkable silyl groups-having polymer can be produced by subjecting a polymer having unsaturated groups (unsaturated polymer) to hydrosilylation reaction with a hydrosilicon compound having hydrolyzable groups. ##STR2##
The hydrosilylation reaction is not only used for the production of the crosslinkable silyl groups-having polymer, but is also generally used for the production of a polymer having silicon-containing groups.
In the hydrosilylation reaction, a platinum compound and oxygen are generally used as a catalyst and a promoter, respectively (Onopchenko. A. et al, J. Org. Chem., 52, 4118, (1987), Lewis. L. N. et al, J. Am. Chem. Soc., 112, 5998, (1990) and U.S. Pat. No. 5,359,111). When it is carried out without oxygen but with an inert gas such as nitrogen or helium, catalyst activity is markedly lowered in the reaction to thereby cause hydrosilylation reaction rate extremely slow. Thus, there arise a possibility that it takes several days to complete the reaction. Consequently, problems may occur, such as extremely lowered productivity and lowered content ratio of the silicon-containing groups in the final polymer.
The hydrosilylation reaction using oxygen as a promoter is used for reaction with a low-molecular-weight compound, for example reaction of 1-alkene including 1-octene with a silane compound such as alkylsilane, dialkylsilane or trialkylsilane including triethylsilane, methyldioctylsilane, trioctylsilane or dioctylsilane; reaction of triethylsilane with vinyltrimethylsilane or vinyltrichlorosilane; reaction of cyclohexene with methyldichlorosilane; reaction of 1-hexene or cyclohexene with methyldichlorosilane; reaction of 1-hexene with dimethoxymethylsilane; reaction of 1,1,1,2,3,3,3-heptamethyltrisiloxane with 1-hexene or trans-2-hexene; reaction of triethylsilane with trans-2-hexene; reaction of trichlorosilane with 1,5-hexadiene; and the like.
When a polymer having unsaturated groups is hydrosilylated with a hydrosilicon compound; however, the yield may not increase even the reaction is carried out in the presence of oxygen. This tendency is accelerated when an organic solvent is used to lower the reactant's viscosity.
The invention has an object to provide a process for producing an organic polymer having silicon-containing groups in a high yield by hydrosilylating an unsaturated groups-having polymer with a hydrosilane compound in the presence of oxygen.
The invention has another object to provide an effective device for producing an organic polymer having silicon-containing groups by hydrosilylating an unsaturated groups-having polymer with a hydrosilane compound.


DISCLOSURE OF THE INVENTION

The objects of the present invention are accomplished by either of the following inventions or by combinations thereof.
1. A process for preparing an organic polymer having silicon-containing groups by subjecting a polymer having an unsaturated group(s) to hydrosilylation reaction with a hydrosilicon compound, which comprises mixing the polymer having unsaturated groups with a solvent in the presence of an inert gas and introducing oxygen into the reactor.
2. A process for preparing an organic polymer having silicon-containing groups by subjecting a polymer having unsaturated groups to hydrosilylation reaction with a hydrosilicon compound in the presence of a solvent, oxygen and an antioxidant.
3. A process for preparing an organic polymer having silicon-containing groups by subjecting a polymer

REFERENCES:
patent: 4803244 (1989-02-01), Umpleby
patent: 4808664 (1989-02-01), Saam
patent: 4879330 (1989-11-01), Yoshino et al.
patent: 5359111 (1994-10-01), Kleyer et al.
patent: 5447990 (1995-09-01), Noda et al.

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