| 摘要 |
<p>#CMT# #/CMT# Double-sided adhesive tape comprises a viscoelastic first polymer layer, a second polymer layer on the top side and a third polymer layer on the bottom side of the viscoelastic first polymer layer respectively. The viscoelastic first polymer layer based on a polymer, is obtainable by polymerization of a monomer composition comprising ethylhexyl acrylate and/or butyl acrylate, methyl acrylate and acrylic acid. The second polymer layer based on a polymer, is obtainable by polymerization of a monomer composition comprising ethylhexyl acrylate and/or butyl acrylate, acrylic acid. #CMT# : #/CMT# Double-sided adhesive tape comprises a viscoelastic first polymer layer, a second polymer layer on the top side and a third polymer layer on the bottom side of the viscoelastic first polymer layer respectively. The viscoelastic, first polymer layer based on a polymer, is obtainable by polymerization of a monomer composition comprising ethylhexyl acrylate and/or butyl acrylate (65-97 wt.%), methyl acrylate (0-30 wt.%) and acrylic acid (3-15 wt.%). The viscoelastic intermediate layer is cross-linked. The second polymer layer based on a polymer, is obtainable by polymerization of a monomer composition comprising ethylhexyl acrylate and/or butyl acrylate (85-95 wt.%), acrylic acid (5-15 wt.%). The second polymer layer is thermally cross-linked using at least one epoxycyclohexyl derivative in the absence of accelerators. Independent claims are also included for: (1) at least one sided adhesive tape, preferably at least two-layer adhesive tape comprising the first viscoelastic polymer layer exhibiting an elastic component of less than 80%, and a second polymer layer exhibiting an elastic component of more than 80%, provided on the top side of the first polymer layer; (2) producing a crosslinked acrylate pressure sensitive adhesive comprising polymerizing a monomer mixture comprising acrylic acid to at least 5 wt.% with epoxycyclohexyl derivative used as a crosslinker at least in the absence of accelerators; and (3) producing a double-sided adhesive tape, comprising the viscoelastic first polymer layer and the second polymer layer on the top side and the intermediate layer on the bottom side, comprising thermal crosslinking of at least one pressure sensitive layer based on the polymer, obtainable by polymerizing a monomer composition comprising ethylhexyl acrylate (58-65 wt.%), butyl acrylate (28-35 wt.%) and acrylic acid (5-15 wt.%), using at least one epoxycyclohexyl derivative as cross-linkers in the absence of accelerators. #CMT#USE : #/CMT# The adhesive tape is useful for bonding of advertising signs and/or panels, glass wall bonding in the inner and/or outer areas, glass slab bonding in inner and/or outer areas; and in home improvement sector, model construction, furniture making, automotive industry, ship-building and aerospace, electronics and electrical industries, transport sector and damping modules. #CMT#ADVANTAGE : #/CMT# The adhesive tape: comprises the intermediate layer and at least one pressure-sensitive adhesive layer arranged on one side of the intermediate layer, thus exhibits a high bond strength; has thermally cross-linked polymers based on acrylate, thus provides strong double-sided adhesive tapes with high transparency (little tendency to yellowing), high moisture resistance and moist-heat resistance, high shear stability at high temperatures; exhibits good adhesive properties, flow behavior, cohesion between the layers, aging and weathering resistance; and has good relaxation behavior, thus can be used for producing damping modules (preferably for mechanical influences such as shock, acoustic effects). #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a schematic representation of a method of producing a 3-layer structure using a 2-roll calendar. 1 : Distribution nozzle 3 : Viscoelastic material 4 : Viscoelastic support layer) 8 : Corona Station 9 : Finished three-layer product #CMT#POLYMERS : #/CMT# Preferred Method: The second polymer layer is a pressure-sensitive adhesive layer, which is thermally cross-linked using at least one epoxycyclohexyl derivative in the absence of accelerators. The third polymer layer provided on the bottom side of the first polymer layer, also has an elastic part of more than 80%. The third polymer layer based on a polymer, is obtainable by polymerization of a monomer composition comprising ethylhexyl acrylate and/or butyl acrylate (85-95 wt.%) and acrylic acid (5-15 wt.%). The third polymer layer is thermally cross-linked using at least one epoxycyclohexyl derivative in the absence of accelerators. Preferred Components: The second and third polymer layers are chemically identical. The adhesive tape exhibits a thickness of at least 300 mu m, preferably 1000 mu m. The second and/or the third polymer layer exhibit no addition of adhesive resins. The epoxycyclohexyl derivative used for cross-linking of the pressure sensitive adhesive layer or layers is epoxycyclohexyl carboxylate, preferably (3,4-epoxycyclohexane)methyl-3,4-epoxycyclohexyl carboxylate. At least one of the sides of the adhesive tape, preferably both sides of the adhesive tape, each exhibit a bond strength to steel of at least 10 N/cm, preferably at least 17 N/cm or greater. The epoxycyclohexyl carboxylate is used in 0.15-0.8 parts by weight based on 100 parts by weight of the polymer to be cross-linked. #CMT#EXAMPLE : #/CMT# 2-ethylhexyl acrylate (55.2 kg), methyl acrylate (20.8 kg), acrylic acid (4 kg) and acetone/isopropanol (94:6) (53.3 kg) were subjected to radical polymerization. The reactor was heated to 58[deg] C and Vazo 64(RTM: 2,2'-Azobis(2-methylpropionitrile)) (40 g) was added after 45 minutes of transit of nitrogen gas under stirring. Subsequently the external heating bath was carried out at 75[deg] C and the reaction was carried out constantly at this external temperature. Then Vazo 64(RTM: 2,2'-Azobis(2-methylpropionitrile) (40 g) was added again after 1 hour and was diluted with acetone/isopropanol mixture (94:6) (10 kg) after 1 hour. The reaction was initiated with Perkadox 16(RTM: Bis-(4-tert-butyl-cyclohexyl)peroxydicarbonate) (120 g) after 5 hours and after 7 hours. The polymerization reaction was terminated and cooled to room temperature after 22 hours of the reaction time to obtain a base polymer. The acrylate copolymer (base polymer) was freed from the solvent using a single screw with screw speed of 150 rotations/minute, a motor current of 15 A and a flow rate of 58.0 kg liquid/hour and was concentrated to obtain a hot melt. The acrylate hot melt pressure sensitive adhesive was melted in an extruder feed and fed as the polymer melt in a twin screw extruder. Then the unit was electrically heated from outside and air-cooled by several fans to obtain the adhesive tape.</p> |
