Adhesive assembly tapes
View Patent ↗The invention relates to double-sided adhesive tape comprising a viscoelastic, first polymer layer, a second polymer layer on the top face and a third polymer layer on the bottom face of the viscoelastic, first polymer layer, where the viscoelastic, first polymer layer is based on a polymer which is obtainable by polymerization of a monomer composition of 65% to 97% by weight of ethylhexyl acrylate and/or butyl acrylate, 0% to 30% by weight of methyl acrylate, 3% to 15% by weight of acrylic acid, the viscoelastic interlayer being crosslinked, the second polymer layer is based on a polymer which is obtainable by polymerization of a monomer composition of 85% to 95% by weight of ethylhexyl acrylate and/or butyl acrylate, 5% to 15% by weight of acrylic acid, this second polymer layer being thermally crosslinked using at least one epoxycyclohexyl derivative in the absence of accelerators.
1. Double-sided adhesive tape comprising a viscoelastic, first polymer layer having a top face and a bottom face, a second polymer layer on the top face and a third polymer layer on the bottom face of the viscoelastic, first polymer layer, wherein
the viscoelastic, first polymer layer is based on a polymer which is obtained by polymerization of a monomer composition of
65% to 97% by weight of ethylhexyl acrylate and/or butyl acrylate,
0% to 30% by weight of methyl acrylate,
3% to 15% by weight of acrylic acid,
the viscoelastic interlayer being crosslinked,
the second polymer layer is based on a polymer which is obtained by polymerization of a monomer composition of
85% to 95% by weight of ethylhexyl acrylate and/or butyl acrylate,
5% to 15% by weight of acrylic acid,
this second polymer layer being thermally crosslinked using at least one epoxycyclohexyl derivative in an amount of up to 0.4% by weight, and in the absence of accelerators.
2. At least single-sidedly adhesive, at least two-layer adhesive tape, comprising
a first, viscoelastic polymer layer,
a second polymer layer provided on the top face of the first polymer layer,
wherein
the first polymer layer has an elastic component of less than 80%,
and
the second polymer layer has an elastic component of more than 80%.
3. Adhesive tape according to claim 2 , wherein
the viscoelastic, first polymer layer is based on a polymer which is obtained by polymerization of a monomer composition of
65% to 97% by weight of ethylhexyl acrylate and/or butyl acrylate,
0% to 30% by weight of methyl acrylate,
3% to 15% by weight of acrylic acid,
the viscoelastic interlayer being crosslinked.
4. Adhesive tape according to claim 2 , wherein
the second polymer layer is based on a polymer which is obtained by polymerization of a monomer composition of
85% to 95% by weight of ethylhexyl acrylate and/or butyl acrylate,
5% to 15% by weight of acrylic acid,
this layer of pressure-sensitive adhesive being thermally crosslinked using at least one epoxycyclohexyl derivative in an amount of up to 0.4% by weight, and in the absence of accelerators.
5. Adhesive tape according to claim 2 , wherein on the bottom face of the first polymer layer there is a third polymer layer, which likewise has an elastic component of more than 80%.
6. Adhesive tape according to claim 1 , wherein
the third polymer layer is based on a polymer which is obtained by polymerization of a monomer composition of
85% to 95% by weight of ethylhexyl acrylate and/or butyl acrylate,
5% to 15% by weight of acrylic acid,
this third polymer layer being thermally crosslinked using at least one epoxycyclohexyl derivative in an amount of up to 0.4% by weight, and in the absence of accelerators.
7. Adhesive tape according to claim 1 , wherein
the second and third polymer layers are chemically identical.
8. Adhesive tape according to claim 1 , having a thickness of at least 300 μm.
9. Adhesive tape according to claim 1 , wherein the second and/or third polymer layers have no addition of tackifier resins.
10. Adhesive tape according to claim 1 , wherein the epoxycyclohexyl derivative for crosslinking the layer or layers of pressure-sensitive adhesive is an epoxycyclohexylcarboxylate.
11. Adhesive tape according to claim 1 , wherein on at least one of its adhesive tape sides, it has a bond strength to steel of at least 10 N/cm.
12. Process for preparing a crosslinked pressure-sensitive acrylate adhesive obtained by polymerization of a monomer mixture containing at least 5% by weight of acrylic acid, wherein said adhesive is crosslinked with crosslinker of at least one epoxycyclohexyl derivative in an amount of up to 0.4% by weight, and in the absence of accelerators.
13. Process for producing a double-sided adhesive tape comprising a viscoelastic, first polymer layer and also a second polymer layer on the top face and on the bottom face of the interlayer,
comprising the thermal crosslinking of at least one layer of pressure-sensitive adhesive which is based on a polymer which is obtained by polymerization of a monomer composition of
58% to 65% by weight of ethylhexyl acrylate,
28% to 35% by weight of butyl acrylate,
5% to 15% by weight of acrylic acid,
using at least one epoxycyclohexyl derivative in an amount of up to 0.4% by weight as crosslinker in the absence of accelerators.
14. Process according to claim 13 , wherein the epoxycyclohexyl derivative for crosslinking the layer or layers of pressure-sensitive adhesive is an epoxycyclohexylcarboxylate.
15. Adhesive tape according to claim 5 , wherein the second and third polymer layers are chemically identical.
16. Adhesive tape according to claim 6 , wherein the second and third polymer layers are chemically identical.
17. The adhesive tape of claim 10 wherein said epoxycyclohexylcarboxylate is (3,4-epoxycyclohexane)methyl 3,4-epoxycyclohexylcarboxylate.
18. The adhesive tape of claim 11 wherein said bond strength to steel is 17 N/cm or more.
19. The process of claim 14 , wherein said epoxycyclohexylcarboxylate is (3,4-epoxycyclohexane)methyl 3,4-epoxycyclohexylcarboxylate.