Blend composition of acrylic type polymers and process for producing the same

Abstract

To provide a method for producing a blend composition of an acrylic type polymer having an excellent mechanical characteristic as well as a low temperature characteristic, and to provide a blend composition of an acrylic type polymer, and also to provide a blend composition of an acrylic type polymer for sealing materials having an excellent abrasion resistance which is important for sealing materials. To prepare a blend composition of an acrylic type polymer by co-precipitation after mixing (A) an aqueous latex of a copolymer—showing about −10° C. to −65° C. of a glass transition temperature Tg—obtained by emulsion polymerization or suspension polymerization of at least one of an acrylic ester and methacrylic ester with a vinyl monomer containing crosslinking group with (B) an aqueous latex of copolymer—showing about 0° C. of a glass transition temperature Tg or a softening point—obtained by emulsion polymerization or suspension polymerization of at least one of an acrylic ester and methacrylic ester with a vinyl monomer having crosslinking group.

What is claimed is:  
     
         1 . A method for producing a blend composition of an acrylic type polymer comprising the following steps of, 
 1) blending an aqueous latex having (A) component and a (B) component, wherein the (A) component consists of an aqueous latex of a copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point of about −10-−65° C., and the (B) component consists of an aqueous latex of a copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point not less than 0° C., and    2) co-precipitating the blended latex of the (A) component and the (B) component.    
     
     
         2 . A method for producing a blend composition of an acrylic type polymer according to    claim 1   , wherein a copolymer of the (A) component is a copolymer of an acrylic ester and a vinyl monomer having crosslinking group.  
     
     
         3 . A method for producing a blend composition of an acrylic type polymer according to    claim 1   , wherein a copolymer of the (B) component is a copolymer of a methacrylic ester, an acrylic ester, and a vinyl monomer having crosslinking group.  
     
     
         4 . A method for producing a blend composition of an acrylic type polymer according to    claim 1   , wherein a copolymer of the (B) component is a copolymer of methacrylic ester and a vinyl monomer having crosslinking group.  
     
     
         5 . A method for producing a blend composition of an acrylic type polymer according to    claim 1   , wherein a copolymer of the (B) component is a copolymer additionally copolymerized with a polyfunctional unsaturated monomer.  
     
     
         6 . A blend composition of an acrylic type polymer comprising (A) component and (B) component, wherein (A) component comprising an acrylic type copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point of about −10- −65° C., and the (B) component comprising a copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point not less than 0° C.  
     
     
         7 . A blend composition of an acrylic type polymer produced by the method according to    claim 1    or    5   .  
     
     
         8 . A blend composition of an acrylic type polymer according to    claim 6   , wherein Mooney viscosity ML 1+4  (100° C.) is about 25 or more.  
     
     
         9 . A polymer composition for sealing materials comprising (A) component, (B) component and ciratives, wherein (A) component comprising an acrylic type copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point of about −10- −65° C., and the (B) component comprising a copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point not less than 0° C.  
     
     
         10 . A polymer composition for the materials of oil seals comprising (A) component, (B) component and ciratives, wherein (A) component comprising an acrylic type copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point of about −10-−65° C., and the (B) component comprising a copolymer having at least one kind of monomer selected from the group of an acrylic ester and a methacrylic ester and a vinyl monomer having a crosslinkable group, and having a glass transition temperature or a softening point not less than 0° C.