Synthesis and use of a carbamate-functional alkoxysilalkylenesilane compound
AssigneesDow Silicones Corporation, Dow Global Technologies LLC
InventorsRobert Kennedy, Xiaoyuan Zhou, Decai Yu, Eric Joffre
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Abstract
A carbamate-functional alkoxysilalkylenesilane compound and methods for its preparation and use are provided. The compound has formula (R12)N—C(═O)O—Si(R22)-D-Si(OR4)3, where R1 may be hydrogen, methyl, or ethyl; R2 may be methyl, R4 may be methyl, and each instance of D is a linear or branched alkylene group such as —CH2—CH2— and —CH(CH3)—. The compound may be used to cap silanol moieties in a silanol-functional polyorganosiloxane to produce a polyalkoxy-functional polyorganosiloxane. The polyalkoxy-functional polyorganosiloxane may be used as a crosslinker in a moisture curable room temperature vulcanizing (RTV) silicone composition.
Claims20
A carbamate-functional alkoxysilalkylenesilane compound comprising formula:
- where
- each R1 is independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 6 carbon atoms, with the proviso that two instances of R1 may be bonded together to form a cyclic secondary amine moiety;
- each R2 is independently selected from the group consisting of alkyl groups and aryl groups;
- D is an alkylene group;
- and
- each R4 is an independently selected alkyl group of 1 to 6 carbon atoms.
A method for preparing a carbamate-functional alkoxysilalkylenesilane compound comprising formula:
- where
- each R1 is independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 6 carbon atoms, with the proviso that two instances of R1 may be bound together to form a cyclic secondary amine moiety;
- each R2 is independently selected from the group consisting of alkyl groups and aryl groups;
- D is an alkylene group;
- and
- each R4 is an independently selected alkyl group of 1 to 6 carbon atoms, wherein the method comprises:
- 1) combining, under conditions to effect reaction, starting materials comprising:
- C) a carbamate salt;
- and
- D) a hydridochlorosilane of formula ClSiR22H, where R2 is as described above;
- thereby forming a reaction product comprising
- E) a carbamate-functional hydridosilane of formula R12NC(═O)O—SiR22H where R1 and R2 are as described above;
- and
- 2) combining, under conditions to effect hydrosilylation reaction, starting materials comprising:
- E) the carbamate-functional hydridosilane;
- F) an alkenyl-functional alkoxysilane of formula R3Si(OR4)3, where R3 is an alkenyl group and R4 is as described above;
- G) a hydrosilylation reaction catalyst;
- optionally H) a solvent;
- thereby forming a hydrosilylation reaction product comprising:
- I) the carbamate-functional alkoxysilalkylenesilane compound, and
- J) a side product.
(canceled)
Dependencies are inferred from the claim text.