High Tg acrylic polymer and epoxy-containing blend therefor as pressure sensitive adhesive
AssigneeAdhesives Research, Inc.
InventorsRobert M. Wigdorski, Michael J. Zajackowski, Kevin J. McKinney
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Abstract
A high Tg acrylic polymer is provided as well as an epoxy-blend thereof for use as a pressure sensitive adhesive. The high Tg acrylic polymer comprises a copolymer of an alkyl (meth)acrylate monomer whose homopolymer has a Tg>20° C., optionally a C1-30 (meth)acrylate monomer, an nitrogen-containing polar monomer, and a polymerizable epoxy-containing monomer, with the monomers being present in an amount such that the copolymer has a Tg>50° C. When blended with at least one liquid epoxy resin, the resulting mixture exhibits desirable pressure sensitive adhesive properties and may be cured.
Claims21
A high Tg acrylic polymer comprised of the polymerization reaction product of the following monomers:
- (1) an alkyl (meth)acrylate monomer whose homopolymer has a Tg>20° C. present in an amount ranging from 20 to 80 percent by weight;
- (2) optionally a C1-30 (meth)acrylate monomer present in an amount of up to 50 percent by weight;
- (3) a nitrogen-containing polar monomer present in an amount ranging from 5 to 20 percent by weight;
- and
- (4) a polymerizable epoxy-containing monomer present in an amount ranging from 30 to 50 percent by weight,
- said monomers being present in an amount such that the Tg of said copolymer is greater than 50° C.
A pressure sensitive adhesive comprised of a curable blend of a liquid epoxy resin and a polymer comprised of the the polymerization reaction product of the following monomers:
- (1) an alkyl (meth)acrylate monomer whose homopolymer has a Tg>20° C. present in an amount ranging from 20 to 80 percent by weight;
- (2) optionally a C1-30 (meth)acrylate monomer present in an amount of up to 50 percent by weight;
- (3) a nitrogen-containing polar monomer present in an amount ranging from 5 to 50 percent by weight;
- and
- (4) a polymerizable epoxy-containing monomer present in an amount ranging from 5 to 50 percent by weight,
- said monomers being present in an amount such that the Tg of said copolymer is greater than 50° C., and said at least one liquid epoxy resin being present in a weight ratio of liquid epoxy resin to said polymer of at least 1:0.5, respectively.
The polymer of claim wherein said C1-30 (meth)acrylate monomer is an ester of (meth)acrylic acid with a non-tertiary alcohol selected from the group consisting of 1-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 1-methyl-pentanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,5,5-trimethyl-1-hexanol, 3-heptanol, 2-octanol, 1-decanol, 1-dodecanol and octadecanol.
Dependencies are inferred from the claim text.