摘要:
Pressure-sensitive adhesive based on polyurethane, characterized in that the polyurethane is composed of the following starting materials which are reacted with one another in the stated proportions: a) at least one aliphatic or alicyclic diisocyanate having in each case an asymmetrical molecular structure, b) a combination of at least one polypropylene glycol diol and at least one polypropylene glycol triol, the ratio of the number of hydroxyl groups in the diol component to the number of hydroxyl groups in the triol component being between 0.7 and 9.0, preferably between 1.5 and 2.5, additionally the ratio of the number of isocyanate groups to the total number of hydroxyl groups being between 0.9 and 1.1, preferably between 0.95 and 1.05, and the diols and triols alternatively being selected and combined in each case as follows: diols having a molecular weight of less than or equal to 1000 are combined with triols whose molecular weight is greater than 1000, preferably greater than or equal to 3000, diols having a molecular weight of greater than 1000 are combined with triols whose molecular weight is less than 1000.
摘要:
Polyurethane-based pressure-sensitive adhesive which attaches strongly to polar plastic surfaces, smooth metal surfaces and glass, but which has weak, if any, adhesion to paper, paperboard or skin and is easily detachable without damaging surfaces during its removal, and is reusable. The adhesive comprises a polyurethane formed by reacting an aliphatic or alicyclic polyisocyanate having a functionality of equal to or less than three with a combination of diol and triol.
摘要:
A single-sidedly or double-sidedly pressure-sensitively adhesive, elastic adhesive sheet comprising at least one layer of a pressure-sensitive adhesive, and having a maximum stretchability of more than 200% and a recovery of more than 60% after stretching to ⅔ of its maximum elongation, said pressure-sensitive adhesive (PSA) being based on a chemically crosslinked polyurethane, wherein the starting materials for the chemically crosslinked polyurethane include at least one isocyanate-reactive substance having a functionality of more than 2.0, in an amount of at least 5% by weight, based on the weight of the polyurethane composition, where the molecular weight of at least one of the starting materials used to form the polyurethane is being greater than or equal to 1000, at least one difunctional polyisocyanates are being used to form the polyurethane, and the ratio of maximum tensile stress to stripping stress is of said elastic adhesive sheet being more than 1.2, and the tensile stress at an elongation of 200% is being not more than 2.0 N/mm.sup.2.
摘要翻译:包括至少一层压敏粘合剂的单面或双面压敏粘合的弹性粘合片,并且在拉伸至2之后具有大于200%的最大拉伸性和60%以上的回复率 所述压敏粘合剂(PSA)基于化学交联的聚氨酯,其中用于化学交联的聚氨酯的起始材料包括至少一种官能度大于2.0的异氰酸酯反应性物质,其中 至少5重量%的量,基于聚氨酯组合物的重量,其中用于形成聚氨酯的至少一种原料的分子量大于或等于1000,至少一种双官能多异氰酸酯是 用于形成聚氨酯,并且最大拉伸应力与剥离应力的比例是所述弹性粘合片大于1.2,并且拉伸强度 在200%的伸长率下不超过2.0N / mm 2。
摘要:
Polyurethane-based pressure-sensitive adhesive, characterized in that the polyurethane is composed of the following starting materials which are reacted catalytically with one another in the stated proportions: a) at least one aliphatic or alicyclic polyisocyanate having a functionality of in each case less than or equal to three, b) a combination of at least one polypropylene glycol diol and at least one polypropylene glycol triol, the ratio of the number of hydroxyl groups in the diol component to the number of hydroxyl groups in the triol component being less than 10, preferably between 0.2 and 5, additionally the ratio of the number of isocyanate groups to the total number of hydroxyl groups being between 0.8 and 1.15, preferably between 0.95 and 1.05, more preferably between 1.0 and 1.05, the catalyst for the reaction to the polyurethane consisting of or comprising a bismuth carboxylate or bismuth carboxylate derivative, and the diols and triols alternatively being selected and combined in each case as follows: diols having a molecular weight of less than or equal to 1000 are combined with triols whose molecular weight is greater than or equal to 1000, preferably greater than or equal to 3000, diols having a molecular weight of greater than 1000 are combined with triols whose molecular weight is less than 1000.
摘要:
Pressure-sensitive adhesive based on polyurethane, characterized in that the polyurethane is composed of the following starting materials which are reacted with one another in the stated proportions: a) at least one aliphatic or alicyclic diisocyanate having in each case an asymmetrical molecular structure, b) a combination of at least one polypropylene glycol diol and at least one polypropylene glycol triol, the ratio of the number of hydroxyl groups in the diol component to the number of hydroxyl groups in the triol component being between 0.7 and 9.0, preferably between 1.5 and 2.5, additionally the ratio of the number of isocyanate groups to the total number of hydroxyl groups being between 0.9 and 1.1, preferably between 0.95 and 1.05, and the diols and triols alternatively being selected and combined in each case as follows: diols having a molecular weight of less than or equal to 1000 are combined with triols whose molecular weight is greater than 1000, preferably greater than or equal to 3000, diols having a molecular weight of greater than 1000 are combined with triols whose molecular weight is less than 1000.
摘要:
Polyurethane-based pressure-sensitive adhesive, characterized in that the polyurethane is composed of the following starting materials which are reacted catalytically with one another in the stated proportions: a) at least one aliphatic or alicyclic polyisocyanate having a functionality of in each case less than or equal to three, b) a combination of at least one triol A based on polypropylene glycol and having an average number-averaged molecular weight Mn of less than or equal to 1000 and a triol B based on polypropylene glycol and having an average number-averaged molecular weight Mn of greater than or equal to 1000, preferably greater than or equal to 3000, the ratio of the number of hydroxyl groups of the triol component A to the number of hydroxyl groups of the triol component B being between greater than 0 and 12, the ratio of the number of isocyanate groups to the total number of hydroxyl groups being between 0.8 and 1.15, preferably between 0.95 and 1.05, the catalyst for the reaction to the polyurethane consisting of or comprising a compound comprising bismuth and carbon, preferably a bismuth carboxylate or a bismuth carboxylate derivative.
摘要:
Adhesive tape having at least two layers A and B laminated directly on one another, with at least one or both layers A or B being an adhesive, and the interfaces of the layers A and B laminated on one another being subjected to a physical method, the physical method being selected from the group consisting of corona discharge, dielectric barrier discharge, flame pretreatment and plasma treatment, before the layers are laminated to one another, with the two methods differing from one another.
摘要:
A double-sided adhesive tape useful for adhesively bonding articles composed of thermoplastic polymer, of EPDM, or of another rubberlike material is provided, having a first outer, pressure-sensitive adhesive side and a second outer, thermally-activatable side, and that comprises an at least dual-layered product construction consisting of layers A and B, layer A being a pressure-sensitive adhesive layer that is chemically cross-linked by thermal initiation, or being a pressure-sensitively adhesive carrier layer chemically cross-linked by thermal initiation, layer B being a thermoplastic synthetic material-based layer, layers A and B being in direct contact with one another, and the surface of layer A, which is in direct contact with layer B, having been corona or plasma pre-treated. The corona or plasma pre-treatment takes place in an atmosphere of nitrogen, carbon dioxide or a noble gas, or a mixture of at least two of these gases.
摘要:
A preferably unbacked adhesive tape with permanent full-area pressure sensitive adhesion, composed of a film of a pressure sensitive adhesive which is preferably coated onto an antiadhesive medium and comprises an alkaline, solid, pulverized, mineral filler with a weight fraction of between more than 5% by weight and 60% by weight, based on the total weight of the adhesive, so that the permanently pressure sensitively adhesive surface of the adhesive tape has a pH of more than 8, and a conductive additive, especially a metal powder, a powder coated with a metal, and/or metallized beads, with a weight fraction of between more than 5% by weight and 60% by weight, so that the adhesive tape is electrically conductive in the z direction, i.e., in the direction of the thickness of the tape.
摘要:
The invention relates to hydroxyl-functionalised polyurethane hot melt prepolymers comprising the chemical reaction product of isocyanate-reactive starting materials with at least one isocyanate-containing starting material. Said prepolymers are characterized in that the isocyanate-reactive starting materials of the hydroxyl-functionalised polyurethane hot melt prepolymers have a polypropylene glycol with a functionality higher than two and a number-average molar mass higher than or equal to 3,000 g/mol, a polypropylene glycol with a functionality less than or equal to two and a number-average molar mass less than or equal to 1,000 g/mol, and a chain lengthener with a functionality less than or equal to 500 g/mol, and the isocyanate-containing starting material of the hydroxyl-functionalised polyurethane hot melt prepolymer has an aliphatic or alicyclic diisocyanate.