Abstract The invention provides a novel method for surface priming when adhesive bonding is desired between a rubber, e.g. silicone rubber, and a substrate of a material such as a metal or plastic resin. The inventive method is performed by use of a primer composition of which the principal ingredient is an organosilicon polymer hitherto not used for such a purpose. The organosilicon polymer is represented by the average unit formula RaSix4-a, in which R is a monovalent hydrocarbon group, X is a divalent atom or group selected from the class consisting of an oxygen atom, an imino group, alkylene groups and a phenylene group and a is a positive number of 0.2 to 1.8, at least one of the hydrocarbon groups denoted by R in a molecule being aliphatically unsaturated and at least 10% by moles of the groups denoted by X in a molecule being the imino groups. This primer composition has good workability and gives adhesive bonding capable of withstanding a prolonged heat treatment in a dry condition or by dipping in a hot oil such as a silicone fluid.
Inventors
👤 Masaharu Takahashi
👤 Yuji Tokushige
👤 Kunio Itoh
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 09:08
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
182 words
A method for surface priming in adhesively bonding a silicone rubber composition to the surface of a substrate which comprises treating the surface of the substrate with an organosilicon polymer having a silazane linkage in the molecule and represented by the average unit formula R.sub.a SiX.sub.(4-a)/2 in which R is a hydrogen atom or a monovalent hydrocarbon group, not all of the atoms and groups denoted by R in a molecule being hydrogen atoms, X is a divalent atom or group selectd from the class consisting of an oxygen atom, an imino group, alkylene groups having 1 to 6 carbon atoms and a phenlyene group and a is a positive number in the range from 0.2 to 1.8, at least one of the atoms and groups denoted by R in a molecule being an aliphatically unsaturated hydrocarbon group and at least 10% by moles of the atoms and groups denoted by X in a molecule being imino groups, and then contacting the treated surface with an unvulcanized silicone rubber composition and subjecting the composite thus formed to conditions to cure the composition.
Claim 2
Independent Claim
182 words
A method for surface priming in adhesively bonding a silicone rubber composition to the surface of a substrate which comprises treating the surface of the substrate with an organosilicon polymer having a silazane linkage in the molecule and represented by the average unit formula R.sub.a SiX.sub.(4-a)/2 in which R is a hydrogen atom or a monovalent hydrocarbon group, not all of the atoms and groups denoted by R in a molecule being hydrogen atoms, X is a divalent atom or group selectd from the class consisting of an oxygen atom, an imino group, alkylene groups having 1 to 6 carbon atoms and a phenlyene group and a is a positive number in the range from 0.2 to 1.8, at least one of the atoms and groups denoted by R in a molecule being an aliphatically unsaturated hydrocarbon group and at least 10% by moles of the atoms and groups denoted by X in a molecule being imino groups, and then contacting the treated surface with an unvulcanized silicone rubber composition and subjecting the composite thus formed to conditions to cure the composition.
Claim 3
Dependent Claim
27 words
The method as claimed in claim 1 wherein the aliphatically unsaturated group denoted by R is selected from the class consisting of vinyl, allyl and 3-methacryloxypropyl groups.