Sulfonato-organosilanol compounds and aqueous solutions thereof

• US 4,338,377 A
• Filed: 08/18/1980
• Issued: 07/06/1982
• Est. Priority Date: 10/10/1979
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Sher, Frank T., Tiers, George V. D., Beck, Boyd R.
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Buffalow, E. Rollins
• Application Number:
  US06/179,178
• Time in Patent Office: 687 Days
• Field of Search: 428/446, 428/447, 428/448, 428/516, 428/428, 428/429, 427/162, 427/164, 427/165, 427/387, 427/389.7
• US Class Current: 428/428
• CPC Class Codes: C01P 2004/80 Particles consisting of a mixture of two or more inorganic phases
• CPC Class Codes: C01P 2006/90 Other properties not specified above
• CPC Class Codes: C03C 17/30 with silicon-containing compounds
• CPC Class Codes: C04B 41/4938 containing silicon bound to hydroxy groups, e.g. trimethyl silanol
• CPC Class Codes: C04B 41/4944 containing atoms other than carbon, hydrogen, oxygen, silicon, alkali metals or halogens, e.g. N-silyldisilazane: Image
• CPC Class Codes: C04B 41/4966 containing silicon bound to hydroxy groups, i.e. OH-blocked polysiloxanes
• CPC Class Codes: C07F 7/0836 Compounds with one or more Si-OH or Si-O-metal linkage
• CPC Class Codes: C09C 1/3081 Treatment with organo-silicon compounds
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer

Abstract

Sulfonato-organosilanol compounds and aqueous solutions and compositions thereof are provided which have at least one sulfonato-organic substituent therein. The weight percentage of oxygen in the compounds is at least about 30% and the weight percentage of silicon in the compounds is not greater than about 15%, these percentages being taken with reference to the water-free acid form of the compounds. Hydrophilic siliceous surfaces and processes for imparting hydrophilicity to such surfaces are also provided.

Claims

1. An article having a durable hydrophilic surface thereon, said article comprising (a) a substrate having a siliceous surface and (b) a reversibly hydrophilic layer thereon, said layer comprising a sulfonato-organosilicon compound bound to said substrate, said compound having at least one sulfonato organic substituent therein wherein said sulfonato-organosilicon compound is a sulfonato-organosilanol compound having at least one sulfonato-organic substituent wherein the weight percentage of oxygen in said silanol compound is at least about 30%, and the weight percentage of silicon in said silanol compound is not greater than about 15%, said percentages being taken with reference to the water-free acid form of said silanol compound.

2. An article in accordance with claim 1 wherein said hydrophilic layer is optically transparent.

3. An article in accordance with claim 1 wherein said hydrophilic layer binds at least 50% by weight more methylene blue dye expressed as the chloride than does the respective normal siliceous surface.

4. An article in accordance with claim 1 wherein said sulfonato-organosilicon compound has the formula ##STR17## wherein Q is selected from hydroxyl, alkyl groups containing from 1 to about 4 carbon atoms and alkoxy groups containing from about 1 to 4 carbon atoms;

X is an organic linking group; and

n is 1 or 2.

5. An article in accordance with claim 1 wherein said layer is less than about 100 nanometers thick.

6. An article in accordance with claim 1 wherein said hydrophilic layer has a Spreading Water Drop Test area of at least about 10 mm².

7. An article in accordance with claim 1 wherein said sulfonato-organosilanol compound has the formula ##STR18## wherein Q is selected from hydroxyl, alkyl groups containing from 1 to about 4 carbon atoms and alkoxy groups containing from 1 to about 4 carbon atoms;

M is selected from hydrogen, alkali metals and organic cations of strong organic bases having a number average molecular weight of less than about 150 and a pK_a of greater than about 11;

X is a organic linking group;

Y is selected from hydrogen, alkaline earth metals, cations or protonated weak bases having an average molecular weight of less than about 200 and a pK_a of less than about 11, alkali metals and organic cations of strong organic bases having an average molecular weight of less than about 150 and a pK_a of greater than about 11, provided that M is hydrogen when Y is selected from hydrogen, alkaline earth metals and organic cations of said protonated weak base;

r is equal to the valence of Y; and

n is 1 or 2.