# US 6,294,620 B1 · Use of emulsified silane coupling agents as primers to improve adhesives of sealants, adhesives and coatings

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- Number: US 6,294,620 B1
- Document ID: US6294620B1
- Status: Granted
- Kind: B1
- Application number: 09/524,632
- Filed: 2000-03-14
- Granted: 2001-09-25
- Earliest claimed: 1998-09-08
- Assignees: Crompton Corporation
- Inventors: Misty Weiyu Huang; Bruce A. Waldman
- Web page: https://patentgrep.com/patent/US6294620B1

## CPC

- C09K 3/1021: {Polyurethanes or derivatives thereof}
- C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16}
- C09D 7/00: Features of coating compositions, not provided for in group C09D5/00 (driers C09F9/00); Processes for incorporating ingredients in coating compositions
- C09D 183/06: containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence)
- C09D 183/08: containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
- C09J 5/02: involving pretreatment of the surfaces to be joined
- C09J 11/06: organic
- C09K 3/10: {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34)
- C08L 83/16: in which all the silicon atoms are connected by linkages other than oxygen atoms
- C09J 2483/00: Presence of polysiloxane
- C09K 2200/0494: Silicon-containing compounds
- C09K 2200/0625: Polyacrylic esters or derivatives thereof
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Emulsions comprising a water insoluble or semi-soluble silane or mixtures of such silanes have been found useful when used alone or formulated into aqueous primer systems to improve the adhesion of sealants, adhesives or coatings to a variety of substrates. These aqueous primers are suitable for both inorganic and organic substrates having either porous or non-porous surfaces. In many cases they have been found to outperform solvent based primers. Primers of this type can be used with a variety of waterborne or solvent based sealants, adhesives or coatings including acrylic or polyurethane latexes, high solid polyurethanes, epoxies and silicones. When used with waterborne systems, it is not necessary to wait for the primer to dry before application of the sealant, adhesive or coating.

## Claims

### Claim 1

A two-part sealant, adhesive or coating system comprising a first adhesion promoting primer part and a second curable resin part, the two parts adapted to be sequentially applied to a substrate to effect a seal, adhesive bond or coating, wherein the primer is an aqueous emulsion of at least one adhesion-promoting water insoluble or slightly soluble organosilane of the formula:
R1aR2bSi(OR3)4−a−b
where
R1 is a hydrocarbon group having from three to thirty carbon atoms which is substituted with an organic functional group, or R1 is a two to thirty carbon alkenyl group;
R2 is alkyl, alkoxy-substituted alkyl, aryl or aralkyl, and has from one to twelve carbon atoms;
R3 is alkyl or alkoxy-substituted alkyl, aryl or aralkyl group, and has from two to ten carbon atoms; and
a is one to three, b is zero to two, and a+b is 1,2 or 3, which organosilane is soluble at between 0 and 8.0 weight percent in water at 25 degrees C.