Poly(meth) acrylate-based pressure-sensitive adhesive
Poly(meth)acrylate pressure-sensitive adhesives comprising 15% to 40% by weight of isobornyl acrylate units, having a uniform bond strength over a wide peel-rate range.
1 . A polyacrylate-based pressure-sensitive adhesive comprising a polymer containing 10% to 40% by weight of isobornyl acrylate units, based on the monomer mixture.
2 . The pressure-sensitive adhesive of claim 1 , comprising a polymer formed from a monomer mixture comprising components:
a) 60% to 85% by weight, based on the weight of monomer mixture, of acrylic and/or methacrylic esters having the formula CH 2 ═C(R 1 )(COOR 2 ), where R 1 ═H or CH 3 and R 2 is a linear or branched alkyl radical having 1 to 14 carbon atoms, and
b) 10% to 40% by weight, based on the weight of monomer mixture of isobornyl acrylate.
3 . The pressure-sensitive adhesive of claim 2 , wherein said monomer mixture further comprises
c) up to 30% by weight of olefinically unsaturated monomers containing functional groups.
4 . The pressure-sensitive adhesive of claim 2 , wherein said component a) comprises acrylic and methacrylic esters having alkyl groups which have 4 to 14 carbon atoms.
5 . The pressure-sensitive adhesive of claim 1 , comprising tackifier resins.
6 . The pressure-sensitive adhesive of claim 1 , further comprising additives selected from the group consisting of plasticizers, fillers, nucleators, expandants, compounding agents and aging inhibitors.
7 . A single-sided or double-sided adhesive tape or transfer tape comprising at least of a carrier and a layer of the pressure-sensitive adhesive of claim 1 .
8 . The single-sided or double-sided adhesive tape or transfer tape of claim 7 . wherein the thickness of said layer of pressure-sensitive adhesive is at least 5 μm.
9 . The single-sided or double-sided adhesive tape or transfer tape of claim 7 , wherein the carrier is made of a film selected from the group consisting of polyester, PET, PE, PP, BOPP and PVC, or of a nonwoven, foam, woven fabric, or woven film, or of release paper.
10 . A method for bonding an adhesive tape to automotive finishes, which comprises bonding an adhesive tape of claim 7 to said automotive finishes.
11 . The pressure-sensitive adhesive of claim 2 , wherein said component b) is present in an amount of 15% to 40% by weight, based on the weight of monomer mixture.
12 . The pressure-sensitive adhesive of claim 4 , wherein said alkyl groups have 4 to 9 carbon atoms.
13 . The pressure-sensitive adhesive of claim 5 , wherein said tackifier resins are compatible with the polymers.
14 . The pressure-sensitive adhesive of claim 5 , wherein said tackifier resins are present in an amount of up to 40% by weight, based on the weight of pressure-sensitive adhesive.
15 . The pressure-sensitive adhesive of claim 14 , wherein said tackifier resins are present in an amount of up to 30% by weight, based on the weight of pressure-sensitive adhesive.
16 . The single-sided or double-sided adhesive tape or transfer tape of claim 8 , wherein said layer of pressure-sensitive adhesive is at least 10 μm thick.