Aqueous emulsions of alkylalkoxysilanes

A process for preparing an aqueous emulsion comprising;

• I) forming a mixture comprising;
• a) 80 to 99.9% by weight of an alkylalkoxysilane of the formula
• R1aSi(OR2)4−a
• b) 0.1 to 20% by weight of a cationic alkoxysilane of the formula
• R3bR4Si(OR5)3−b
• c) up to 20% by weight of a hydroxy terminated polydimethylsiloxane having a degree of polymerization from 1 to 500, said hydroxy terminated polydimethylsiloxane being present in the mixture
• where;
• R1 is an alkyl group containing 1 to 30 carbon atoms,
• R2 and R5 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, CH3C(O)—, CH3CH2C(O)—, HOCH2CH2—, CH3OCH2CH2—, and C2H5OCH2CH2—,
• R3 is an alkyl group containing 1 to 4 carbons,
• R4 is a monovalent hydrocarbon having at least one quaternary ammonium group substituent,
• a is 1 or 2,
• b is 0, 1 or 2,
• II) combining 5 to 95 wt % of the mixture of step I) with 5 to 95 wt % of water to form an aqueous emulsion.

An aqueous emulsion consisting essentially of:

• a) 1 to 85% by weight of an alkylalkoxysilane of the formula
• R1aSi(OR2)4−a
• b) 0.1 to 10% by weight of a cationic alkoxysilane of the formula
• R3bR4Si(OR5)3−b
• c) up to 20% by weight of a hydroxy terminated polydimethylsiloxane having a degree of polymerization from 1 to 500, said hydroxy terminated polydimethylsiloxane being present in the mixture
• where;
• R1 is an alkyl group containing 1 to 30 carbon atoms,
• R2 and R5 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, CH3C(O)—, CH3CH2C(O)—, HOCH2CH2—, CH3OCH2CH2—, and C2H5OCH2CH2—,
• R3 is an alkyl group containing 1 to 4 carbons,
• R4 is a monovalent hydrocarbon having at least one quaternary ammonium group substituent,
• a is 1 or 2,
• b is 0, 1 or 2, and
• wherein;
• the weight ratio of components a/b is 4,
• the combined weight of (a), (b) and (c) is no greater than 95% of the emulsion.

An aqueous microemulsion comprising:

• a) 1 to 90% by weight of an alkylalkoxysilane of the formula
• R1aSi(OR2)4−a
• b) 0.1 to 90% by weight of a cationic alkoxysilane of the formula
• R3bR4Si(OR5)3−b
• where;
• R1 is an alkyl group containing 1 to 30 carbon atoms,
• R2 and R5 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, CH3C(O)—, CH3CH2C(O)—, HOCH2CH2—, CH3OCH2CH2—, and C2H5OCH2CH2—,
• R3 is an alkyl group containing 1 to 4 carbons,
• R4 is a monovalent hydrocarbon having at least one quaternary ammonium group substituent,
• a is 1 or 2,
• b is 0, 1 or 2,
• wherein;
• the combined weight of (a) and (b) is no greater than 95% of the microemulsion and, the microemulsion is essentially free of any co-surfactants, and the microemulsion is clear or transparent to the naked eye.

A process for preparing an aqueous microemulsion comprising;

• I) forming a mixture comprising;
• a) 10 to 99.9% by weight of an alkylalkoxysilane of the formula
• R1aSi(OR2)4−a
• b) 0.1 to 90% by weight of a cationic alkoxysilane of the formula
• R3bR4Si(OR5)3−b
• where;
• R1 is an alkyl group containing 1 to 30 carbon atoms,
• R2 and R5 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, CH3C(O)—, CH3CH2C(O)—, HOCH2CH2—, CH3OCH2CH2—, and C2H5OCH2CH2—,
• R3 is an alkyl group containing 1 to 4 carbons,
• R4 is a monovalent hydrocarbon having at least one quaternary ammonium group substituent,
• a is 1 or 2,
• b is 0, 1 or 2,
• II) combining 5 to 95 wt % of the mixture of step I) with 5 to 95 wt % of water to form an aqueous microemulsion, and the aqueous microemulsion is clear or transparent to the naked eye.

An aqueous microemulsion consisting essentially of:

• a) 1 to 90% by weight of an alkylalkoxysilane of the formula
• R1aSi(OR2)4−a
• b) 0.1 to 90% by weight of a cationic alkoxysilane of the formula
• R3bR4Si(OR5)3−b
• where;
• R1 is an alkyl group containing 1 to 30 carbon atoms,
• R2 and R5 are independently selected from the group consisting of hydrogen, alkyl groups containing 1 to 4 carbon atoms, CH3C(O)—, CH3CH2C(O)—, HOCH2CH2—, CH3OCH2CH2—, and C2H5OCH2CH2—,
• R3 is an alkyl group containing 1 to 4 carbons,
• R4 is a monovalent hydrocarbon having at least one quaternary ammonium group substituent,
• a is 1 or 2,
• b is 0, 1 or 2,
• wherein;
• the combined weight of (a) and (b) is no greater than 95% of the microemulsion, and the aqueous microemulsion is clear or transparent to the naked eye.