Hydrophilic Organosilanes
The present disclosure relates to compositions comprising an organosilane having the formula; (R 1 )n(R 2 O) (3.n)SiR 3 O(CH 2 CH 2 O)a(C 3 H 6 O)b R 4 where n is 1 or 2, a≧1, b may vary from 0 to 30, with the proviso a≧b, R 1 is a hydrocarbon group containing 1 to 12 carbon atoms, R 2 is hydrogen or an alkyl group containing 1 to 6 carbon atoms, R 3 is a divalent hydrocarbon group containing 2 to 12 carbon atoms, R 4 is hydrogen, R 1 , or an acetyl group. The present organosilane compositions are particularly useful to treat various surfaces to render them more hydrophilic.
1 . A composition comprising an organosilane having the formula;
(R 1 ) (3-n) (R 2 O) n SiR 3 O(CH 2 CH 2 O) a (C 3 H 6 O) 6 R 4
where
n is 1 or 2,
a≧1, b may vary from 0 to 30, with the proviso a≧b,
R 1 is a hydrocarbon group containing 1 to 12 carbon atoms,
R 2 is hydrogen or an alkyl group containing 1 to 6 carbon atoms,
R 3 is a divalent hydrocarbon group containing 2 to 12 carbon atoms,
R 4 is hydrogen, R 1 , or an acetyl group.
2 . The composition of claim 1 where n is 2.
3 . The composition of claim 2 where a ranges from 4 to 30.
4 . The composition of claim 2 where R 1 is methyl and R 2 is methyl or ethyl.
5 . The composition of claim 2 where R 3 is propylene or —CH 2 CH 2 C(CH 3 ) 2 —.
6 . The composition of claim 1 where the organosilane has the average formula
(CH 3 )(CH 3 CH 2 O) 2 SiCH 2 CH 2 CH 2 O(CH 2 CH 2 O) 7 CH 3 , or
(CH 3 )(CH 3 O) 2 SiCH 2 CH 2 C(CH 3 ) 2 O(C 2 H 4 O) 18 (C 3 H 6 O) 18 H.
7 . A process for preparing an organosilane composition comprising reacting:
a) an organosilane of the formula (R 1 ) (3-n) (R 2 O) n H,
where
R 1 is an alkyl group containing 1 to 4 carbon atoms,
R 2 is an alkyl group containing 1 to 4 carbon atoms,
the subscript n is 1 or 2,
b) a polyoxyalkylene of the formula R 5 O(CH 2 CH 2 O) a (C 3 H 6 O) b R 4 wherein
a≧1, b may vary from 0 to 30, with the proviso a≧b,
R 4 is hydrogen, R 1 , or an acetyl group,
R 5 is an unsaturated aliphatic hydrocarbon group
containing 2 to 12 carbon atoms, and
c) a hydrosilylation catalyst.
8 . The process of claim 7 where R 5 is
H 2 C═CHC(CH 3 ) 2 .
9 . The process of claim 7 where the organosilane has the formula
(CH 3 )(CH 3 CH 2 O) 2 SiH.
10 . The process of claim 7 where the polyoxyalkylene has the formula
H 2 C═CHCH 2 O[C 2 H 4 O] a CH 3 ,
where a varies from 4 to 30.
11 . The composition prepared by the process of claim 7 .
12 . A treatment composition comprising reaction products from the hydrolysis and/or condensation of the organosilane according to claim 1 .
13 . A method of treating a surface comprising applying the composition according to claim 1 to a surface.
14 . The method of claim 13 where the surface is a cellulosic fiber.
15 . An article of manufacture comprising the treated fiber of claim 14 .