Use of emulsified silane coupling agents as primers to improve adhesives of sealants, adhesives and coatings

• US 6,294,620 B1
• Filed: 03/14/2000
• Issued: 09/25/2001
• Est. Priority Date: 09/08/1998
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: Crompton Corporation (Lanxess AG)
• Inventors: Waldman, Bruce A., Huang, Misty Weiyu
• Primary Examiner(s): CAMERON, ERMA C
• Application Number:
  US09/524,632
• Time in Patent Office: 560 Days
• Field of Search: 525/452
• US Class Current: 525/452
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08L 83/16 in which all the silicon atoms are connected by linkages other than oxygen atoms
• CPC Class Codes: C09D 183/06 containing silicon bound to oxygen-containing groups C09D183/12 takes precedence
• CPC Class Codes: C09D 183/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• CPC Class Codes: 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
• CPC Class Codes: C09D 7/00 Features of coating compositions, not provided for in group C09D5/00 driers C09F9/00; Processes for incorporating ingredients in coating compositions
• CPC Class Codes: C09J 11/06 organic
• CPC Class Codes: C09J 2483/00 Presence of polysiloxane
• CPC Class Codes: C09J 5/02 involving pretreatment of the surfaces to be joined
• CPC Class Codes: C09K 2200/0494 Silicon-containing compounds
• CPC Class Codes: C09K 2200/0625 Polyacrylic esters or derivatives thereof
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34
• CPC Class Codes: C09K 3/1021 Polyurethanes or derivatives thereof

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

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: