Blends of block copolymer and acrylic adhesives

Abstract

Pressure sensitive adhesive compositions containing 92 to 99.9 parts of a block copolymer adhesive composition and 0.1 to less than 10 parts of an acrylic adhesive composition are described. Tapes including such adhesives, and methods of making such tapes are also described.

1 - 53 . (canceled) 
   
   
       54 . A pressure sensitive adhesive composition comprising:
 (A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
 (a) a first block copolymer comprising
 (i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and 
 (ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and 
 
   (B) 0.1 to less than 8 parts of an acrylic adhesive composition comprising:
 (i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and 
 (ii) 0 to 30 parts of a copolymerized reinforcing monomer. 
   
   
   
       55 . The pressure sensitive adhesive according to  claim 54 , wherein the first block copolymer is a multi-arm block copolymer of the formula Q n -Y, wherein:
 (a) Q represents an arm of the multi-arm block copolymer and each arm independently has the formula R-G, wherein:
 (i) R represents the rubbery block; and 
 (ii) G represents the glassy block; 
   (b) n represents the number of arms and is a whole number of at least 3; and   (c) Y is the residue of a multifunctional coupling agent.   
   
   
       56 . The pressure sensitive adhesive according to  claim 55 , wherein the block copolymer adhesive composition further comprises (b) a second block copolymer comprising at least one rubbery block comprising a polymerized second conjugated diene, a hydrogenated derivative thereof, or combinations thereof and at least one glassy block comprising a second polymerized monovinyl aromatic monomer. 
   
   
       57 . The pressure sensitive adhesive according to  claim 56 , wherein the second block copolymer is a linear block copolymer. 
   
   
       58 . The pressure sensitive adhesive according to  claim 57 , wherein the second block copolymer is a triblock copolymer selected from the group consisting of styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-butadiene-styrene, and combinations thereof. 
   
   
       59 . The pressure sensitive adhesive according to  claim 57 , wherein the ratio of multi-arm block copolymers to linear block copolymers ranges from 1.5:1 to 9:1. 
   
   
       60 . The pressure sensitive adhesive according to  claim 57 , wherein the first block copolymer is a polymodal, asymmetric star block copolymer. 
   
   
       61 . The pressure sensitive adhesive according to  claim 57 , wherein the block copolymer adhesive composition further comprises a first high Tg tackifier having a Tg of at least 60 degrees C., wherein the first high Tg tackifier is compatible with at least one rubbery block. 
   
   
       62 . The pressure sensitive adhesive according to  claim 61 , wherein the block copolymer adhesive composition further comprises a second high Tg tackifier having a Tg of at least 60 degrees C., wherein the second high Tg tackifier is compatible with the at least one glassy block. 
   
   
       63 . The pressure sensitive adhesive according to any one of  claims 61  wherein the ratio of the total amount of high Tg tackifiers to block copolymers ranges from 0.8:1 to 1.25:1. 
   
   
       64 . The pressure sensitive adhesive according to any one of  claims 61  wherein the ratio of the rubbery block compatible high Tg tackifier to the glassy block compatible high Tg tackifier is ranges from 1:1 to 9:1. 
   
   
       65 . The pressure sensitive adhesive according to any one of  claims 61  the ratio of the combination of the block copolymers and high Tg tackifiers to the acrylate component is at least 8.3:1. 
   
   
       66 . The pressure sensitive adhesive according to  claim 54 , wherein the first block copolymer is a polymodal, asymmetric star block copolymer. 
   
   
       67 . The pressure sensitive adhesive according to  claim 54 , wherein the block copolymer adhesive composition further comprises a first high Tg tackifier having a Tg of at least 60 degrees C., wherein the first high Tg tackifier is compatible with at least one rubbery block. 
   
   
       68 . The pressure sensitive adhesive according to  claim 67 , wherein the block copolymer adhesive composition further comprises a second high Tg tackifier having a Tg of at least 60 degrees C., wherein the second high Tg tackifier is compatible with the at least one glassy block. 
   
   
       69 . The pressure sensitive adhesive according to any one of  claims 67  wherein the ratio of the total amount of high Tg tackifiers to block copolymers ranges from 0.8:1 to 1.25:1. 
   
   
       70 . The pressure sensitive adhesive according to any one of  claims 67  wherein the ratio of the rubbery block compatible high Tg tackifier to the glassy block compatible high Tg tackifier is ranges from 1:1 to 9:1. 
   
   
       71 . The pressure sensitive adhesive according to any one of  claims 67  the ratio of the combination of the block copolymers and high Tg tackifiers to the acrylate component is at least 8.3:1. 
   
   
       72 . A tape comprising a foam backing having a first major surface and a second major surface; and a first adhesive skin bonded to the first major surface, wherein the first adhesive skin comprises a first pressure sensitive adhesive comprising
 (A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
 (a) a first block copolymer comprising
 (i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and 
 (ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and 
 
   (B) 0.1 to less than 8 parts of an acrylic adhesive composition comprising:
 (i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and 
 (ii) 0 to 30 parts of a copolymerized reinforcing monomer. 
   
   
   
       73 . The tape of  claim 72 , wherein the first block copolymer is a multi-arm block copolymer of the formula Q n -Y, wherein:
 Q represents an arm of the multi-arm block copolymer and each arm independently has the formula R-G, wherein:
 (i) R represents the rubbery block; and 
 (ii) G represents the glassy block; 
   n represents the number of arms and is a whole number of at least 3; and   Y is the residue of a multifunctional coupling agent; and   
     wherein the block copolymer adhesive composition further comprises (b) a second block copolymer comprising at least one rubbery block comprising a polymerized second conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and at least one glassy block comprising a second polymerized monovinyl aromatic monomer, and wherein the second block copolymer is a linear block copolymer. 
   
   
       74 . A bonded composite comprising:
 a first substrate having a first surface, wherein the first surface has a surface energy of less than 35 dyne per centimeter;   a second substrate having a second surface; and   a bonding interface between the first surface of the first substrate and the second surface of the second substrate, wherein the bonding interface comprises a pressure sensitive adhesive comprising   (A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
 (a) a first block copolymer comprising
 (i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and 
 (ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and 
 
   (B) 0.1 to less than 8 parts of an acrylic adhesive composition comprising:
 (i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and 
 (ii) 0 to 30 parts of a copolymerized reinforcing monomer. 
   
   
   
       75 . The bonded composite of  claim 74 , wherein the first block copolymer is a multi-arm block copolymer of the formula Q n -Y, wherein:
 Q represents an arm of the multi-arm block copolymer and each arm independently has the formula R-G, wherein:
 (i) R represents the rubbery block; and 
 (ii) G represents the glassy block; 
   n represents the number of arms and is a whole number of at least 3; and   Y is the residue of a multifunctional coupling agent; and   
     wherein the block copolymer adhesive composition further comprises (b) a second block copolymer comprising at least one rubbery block comprising a polymerized second conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and at least one glassy block comprising a second polymerized monovinyl aromatic monomer, and wherein the second block copolymer is a linear block copolymer.