Reversible PSAs based on acrylic block copolymers
OwnerMarc Husemann, Thilo Dollaseinventors
Life of this patent
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Abstract
A pressure sensitive adhesive system for reversible bonds, comprising at least one pressure sensitive adhesive based on at least one block copolymer, the weight fractions of the block copolymers accounting in total for at least 50% of the pressure sensitive adhesive, at least one block copolymer being composed at least in part on the basis of (meth)acrylic acid derivatives, additionally at least one block copolymer comprising at least the unit P(A)-P(B)-P(A) composed of at least one polymer block P(B) and at least two polymer blocks P(A), the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C., and the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C.
Claims27
A pressure sensitive adhesive system for reversible bonds, comprising at least one pressure sensitive adhesive based on at least one block copolymer, the weight fractions of the block copolymers accounting in total for at least 50% of the pressure sensitive adhesive, at least one block copolymer being composed at least in part on the basis of (meth)acrylic acid derivatives, additionally at least one block copolymer comprising at least the unit P(A)-P(B)-P(A) composed of at least one polymer block P(B) and at least two polymer blocks P(A), where
- P(A) independently of one another represent homopolymer and/or copolymer blocks of monomers A, the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C.,
- P(B) represents a homopolymer or copolymer block of monomers B, the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C.,
- the polymer blocks P(A) and P(B) are not homogeneously miscible with one another, and
- the (co)polymers P*(A) and P*(B) corresponding to the polymer blocks P(A) and P(B) each possessing a surface tension of □ 45 mJ/m2.
The pressure sensitive adhesive system as claimed in at least one of the preceding claims, wherein
- the pressure sensitive adhesive is admixed with tackifier resins, and/or wherein the pressure sensitive adhesive is admixed with plasticizers, fillers, nucleators, expandants, compounding agents and/or aging inhibitors.
A method of forming an adhesive bond, which comprises forming said adhesive bond with at least one pressure sensitive adhesive based on at least one block copolymer, at least one block copolymer being composed at least in part on the basis of (meth)acrylic acid derivatives, additionally at least one block copolymer comprising at least the unit P(A)-P(B)-P(A) composed of at least one polymer block P(B) and at least two polymer blocks P(A), where
- P(A) independently of one another represent homopolymer and/or copolymer blocks of monomers A, the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C.,
- P(B) represents a homopolymer or copolymer block of monomers B, the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C.,
- the polymer blocks P(A) and P(B) are not homogeneously miscible with one another, and
- the (co)polymers P*(A) and P*(B) corresponding to the polymer blocks P(A) and P(B) each possessing a surface tension of □ 45 mJ/m2,
- for reversible bonds.
Dependencies are inferred from the claim text.