Method of bonding adherend

Abstract

The present invention provides a method of bonding an adherend to a substrate which comprises applying a curable composition comprising at least one polymer or resin selected from the group consisting of (A) a reactive silyl group-containing polyoxyalkylene polymer, (B) a reactive silyl group-containing saturated hydrocarbon polymer, (C) a copolymer of which molecular chain is substantially made of one or more alkyl acrylate monomer unit(s) and/or alkyl methacrylate monomer unit(s) and (D) an epoxy resin and having a viscosity before curing of not lower than 10,000 Pa·s as determined on a B8U type viscometer under the following condition; rotor No. 7; number of revolutions 0.5 rpm; in an atmosphere at 23° C., according to JIS K 7117 to the adherend and/or substrate and then joining the adherend and the substrate together without temporary tacking. By using a moisture-curable adhesive composition having a specific composition and a specific viscosity, it becomes possible to bond adherends without open time and without temporary tacking after application.

1 . A method of bonding an adherend to a substrate which comprises applying a curable composition comprising at least one polymer or resin selected from the group consisting of 
 (A) a reactive silyl group-containing polyoxyalkylene polymer,    (B) a reactive silyl group-containing saturated hydrocarbon polymer,    (C) a copolymer of which molecular chain is substantially made of one or more alkyl acrylate monomer unit(s) and/or alkyl methacrylate monomer unit (s) and    (D) an epoxy resin,    (E) 100 to 500 parts by weight of a filler per 100 parts by weight of (A) and/or (C) components and    (F) 5 to 30 parts by weight of a thixotropic agent parts by weight of (A) and/or (C) components, and having a viscosity before curing of not lower than 10,000 Pa·s as determined on a B8U type viscometer under the following condition; rotor No. 7; number of revolutions 0.5 rpm; in an atmosphere at 23° C., according to JIS K 7117 to the adherend and/or the substrate and then joining the adherend and the substrate together without temporary tacking wherein the adherend is a building material panel selected from the group consisting of decorative plastic boards and gypsum boards, and the substrate is mortar.    
   
   
       2 . The method of adhesion according to  claim 1 , 
 wherein the reactive silyl group in the component (A) and/or (B) is a group represented by the general formula (1):      —[Si(R 1   2-b )(X b )O] m Si(R 2   3-a )X a   (1)    wherein R 1  and R 1  are the same or different and each represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms or a triorganosiloxy group represented by (R′) 3 SiO—and, when there are two or more R 1  or R 2  groups, they may be the same or different, and R′ is a univalent hydrocarbon group containing 1 to 20 carbon atoms and the three R′ groups may be the same or different; X represents a hydroxyl group or a hydrolysable group; a represents 0, 1, 2 or 3, b represents 0, 1 or 2, provided that the relation a+Σb≧2 is satisfied; the numbers b in the m —Si (R 1   2-b )(X b )O— groups may be the same or different; and m represents an integer of 0 to 19.    
   
   
       3 . The method of adhesion according to  claim 1 , wherein the (A) component polyoxyalkylene polymer has a polyoxypropylene main chain skeleton.  
   
   
       4 . The method of adhesion according to  claim 1 , wherein the (A) component is a reactive silyl group-containing polyoxyalkylene polymer obtainable by reacting an isocyanato group-terminated polyoxyalkylene polymer derived from a hydroxyl group-terminated polyoxyalkylene polymer by chain extension with a bifunctional or trifunctional isocyanate compound, or an isocyanato group-terminated polyoxyalkylene polymer derived from a hydroxyl group-terminated polyoxyalkylene polymer having a number average molecular weight of 7,000 to 50,000, as determined by GPC and expressed on the polystyrene equivalent basis, by converting the terminal hydroxyl group to an isocyanato group-containing group with a compound represented by the general formula (3):  
       HN(R 3 )—(R 4 —NH) n —R 5 —Si(R 2   3-c )X c   (3)  
     or the general formula (4):  
       HS—R 4 —Si(R 2   3-c )X c   (4)  wherein R 3  represents a hydrogen atom, an alkyl group containing not more than 10 carbon atoms, an aryl group containing 6 to 15 carbon atoms or an aralkyl group containing 7 to 15 carbon atoms; R 4  and R 5  each represents a bivalent organic group containing not more than 10 carbon atoms; n represents an integer of 0 to 10; R 2  represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms or a triorganosiloxy group represented by (R′) 3 SiO—and, when there are two or more R 2  groups, they may be the same or different, and R′ is a univalent hydrocarbon group containing 1 to 20 carbon atoms and the three R′ groups may be the same or different; X represents a hydroxyl group or a hydrolysable group; and c represents 2 or 3.    
   
   
       5 . The method of adhesion according to  claim 1 , 
 wherein the (B) component saturated hydrocarbon polymer has a polyisobutylene main chain skeleton.    
   
   
       6 . The method of adhesion according to  claim 1 , in which the (C) component is a copolymer of which molecular chain is substantially composed of (a) an alkyl acrylate and/or methacrylate monomer unit in which the alkyl group contains 1 to 8 carbon atoms and (b) an alkyl acrylate and/or methacrylate monomer unit in which the alkyl group contains at least 10 carbon atoms.  
   
   
       7 . The method of adhesion according to  claim 6 , wherein the (C) component is a copolymer having a silicon-containing group capable of crosslinking under formation of a siloxane bond.  
   
   
       8 . The method of adhesion according to  claim 1 , wherein the adherend is a building material panel.  
   
   
       9 . A curable composition which comprises at least one polymer or resin selected from the group consisting of 
 (A) a reactive silyl group-containing polyoxyalkylene polymer,    (B) a copolymer of which molecular chain is substantially made of one or more alkyl acrylate monomer unit(s) and/or alkyl methacrylate monomer unit(s)    which has a viscosity before curing of not lower than 10,000 Pa·s as determined on a B8U type viscometer under the following condition; rotor No. 7; in number of revolutions 0.5 rpm; in an atmosphere at 23° C., according to JIS K 7117    (C) 100 to 500 parts by weight of a filler per 100 parts by weight of (A) and/or (C) components and    (D) 5 to 30 parts by weight of a thixotropic agent parts by weight of (A) and/or (C) components.    
   
   
       10 . The curable composition according to  claim 9 , 
 wherein the (A) component is a reactive silyl group-containing polyoxyalkylene polymer obtainable by reacting an isocyanato group-terminated polyoxyalkylene polymer derived from a hydroxyl group-terminated polyoxyalkylene polymer by chain extension with a bifunctional or trifunctional isocyanate compound, or an isocyanato group-terminated polyoxyalkylene polymer derived from a hydroxyl group-terminated polyoxyalkylene polymer having a number average molecular weight of 7,000 to 50,000, as determined by GPC and expressed on the polystyrene equivalent basis, by converting the terminal hydroxyl group to an isocyanato group-containing group with a compound represented by the general formula (3):      HN(R 3 )—(R 4 —NH) n —R 5 —Si(R 2   3-c )X c   (3)    or the general formula (4):      HS—R 4 —Si(R 2   3-c )X c   (4)    wherein R 3  represents a hydrogen atom, an alkyl group containing not more than 10 carbon atoms, an aryl group containing 6 to 15 carbon atoms or an aralkyl group containing 7 to 15 carbon atoms; R 4  and R 5  each represents a bivalent organic group containing not more than 10 carbon atoms; n represents an integer of 0 to 10; R 2  represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms or a triorganosiloxy group represented by (R′) 3 SiO—and, when there are two or more R 2  groups, they may be the same or different, and R′ is a univalent hydrocarbon group containing 1 to 20 carbon atoms and the three R′ groups may be the same or different; X represents a hydroxyl group or a hydrolysable group; and c represents 2 or 3.    
   
   
       11 . A method of bonding an adherend to a substrate which comprises applying a curable composition comprising at least one polymer or resin selected from the group consisting of 
 (A) a reactive silyl group-containing polyoxyalkylene polymer,    (B) a reactive silyl group-containing saturated hydrocarbon polymer,    (C) a copolymer of which molecular chain is substantially made of one or more alkyl acrylate monomer unit(s) and/or alkyl methacrylate monomer unit(s) and    (D) an epoxy resin,    (E) 100 to 300 parts by weight of a colloidal calcium carbonate having a particle diameter of not larger than 0.1 μm per 100 parts by weight of (A) and/or (C) components and    (F) 5 to 30 parts by weight of a thixotropic agent parts by weight of (A) and/or (C) components, and having a viscosity before curing of not lower than 10,000 Pa·s as determined on a B8U type viscometer under the following condition; rotor No. 7; number of revolutions 0.5 rpm; in an atmosphere at 23° C., according to JIS K 7117 to the adherend and/or the substrate and then joining the adherend and the substrate together without temporary tacking wherein the adherend is a building material panel selected from the group consisting of decorative plastic boards and gypsum boards, and the substrate is mortar.    
   
   
       12 . A curable composition 
 which comprises at least one polymer or resin selected from the group consisting of    (A) a reactive silyl group-containing polyoxyalkylene polymer,    (B) a copolymer of which molecular chain is substantially made of one or more alkyl acrylate monomer unit(s) and/or alkyl methacrylate monomer unit(s)    which has a viscosity before curing of not lower than 10,000 Pa s as determined on a B8U type viscometer under the following condition; rotor No. 7; in number of revolutions 0.5 rpm; in an atmosphere at 23° C., according to JIS K 7117    (C) 100 to 300 parts by weight of colloidal calcium carbonate having a particle diameter of not larger than 0.1 μm per 100 parts by weight of (A) and/or (C) components and    (D) 5 to 30 parts by weight of a thixotropic agent parts by weight of (A) and/or (C) components.