Adhesion promotor

• US 4,727,168 A
• Filed: 09/11/1985
• Issued: 02/23/1988
• Est. Priority Date: 09/14/1984
• Status: Expired due to Term

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Ikeno, Masayuki, Inomata, Hiroshi, Yoshino, Masachika
• Primary Examiner(s): Shaver, Paul F.
• Application Number:
  US06/774,802
• Time in Patent Office: 895 Days
• Field of Search: 556/408, 556/413, 556/423
• US Class Current: 556/408
• CPC Class Codes: C07F 7/1804 Compounds having Si-O-C linkages Si-O-acyl linkages C07F7/1896
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08K 5/544 containing nitrogen
• CPC Class Codes: C09D 183/14 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms C09D183/10 takes precedence
• 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

Abstract

The invention provides an efficient method for improving the adhesive bonding strength of various types of rubbery sealant compositions, e.g. room temperature curable silicone rubber composition, to the substrate surface on which it has been cured. The method comprises coating the substrate surface with or admixing the sealant composition before application to the substrate surface with an adhesion promotor which is a reaction product of a reaction mixture comprising:

(a) 1 mole of an organic amine compound having at least one active hydrogen atom in a molecule or an aminoalkyl alkoxysilane compound;

(b) from 0.5 to 4 moles of an organic compound having at least one epoxy group in a molecule or an epoxyalkyl alkoxysilane; and

(c) from 0.5 to 12 moles of an alkoxysilane represented by the general formula R¹_a Si(OR²)_4-a, in which R¹ is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, R² is a monovalent hydrocarbon group having 1 to 4 carbon atoms or an alkoxy-substituted alkyl group and a is a number of zero, 1, 2 or 3, or a partial hydrolysis product thereof, at least one of the components (a) and (b) being an aminoalkyl alkoxysilane or an epoxyalkyl alkoxysilane, respectively.

Claims

1. An adhesion promotor for a rubbery sealant composition which is a reaction product of a reaction mixture comprising:

(a) 1 mole of an organic amine compound having at least one active hydrogen atom in a molecule or an aminoalkyl alkoxysilane compound;

(b) from 0.5 to 4 moles of an organic compound having at least one epoxy group in a molecule or an epoxyalkyl alkoxysilane compound; and

(c) from 0.5 to 12 moles of an alkoxysilane represented by the general formula R¹_a Si(OR²)_4-a, in which R¹ is a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, R² is a monovalent hydrocarbon group having 1 to 4 carbon atoms or an alkoxy-substituted alkyl group and a is a number of zero, 1, 2 or 3, or a partial hydrolysis product thereof, at least one of the components (a) and (b) being an aminoalkyl alkoxysilane or an epoxyalkyl alkoxysilane, respectively.