Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a pressure sensitive adhesive having a high molecular weight and a narrow molecular weight distribution in combination, and to provide a pressure sensitive adhesive, particularly a polyacrylic pressure sensitive adhesive, produced therefrom.SOLUTION: Astonishingly, a polymer having a high molecular weight and a narrow molecular weight distribution, particularly a polyacrylate having a high molecular weight and a narrow molecular weight distribution, can be excellently produced by an RAFT method in the presence of a diradical initiator to thermally produce a diradical to be then cyclized. The polymer is suitable for use as a pressure sensitive adhesive having a shear strength.
Abstract:
PROBLEM TO BE SOLVED: To provide a thermal cross-linking of a polyacrylate composition capable of being processed from a melted product.SOLUTION: A cross-linking agent-accelerator system for thermally cross-linking a polyacrylate having a functional group suitable for cross-link-reacting with an epoxy group, comprising at least one substance (cross-linking agent) containing at least one epoxy group, and at least one substance (accelerator) represented by general formula (I): RN-CRR-CRR-(CRR)-X.
Abstract:
PROBLEM TO BE SOLVED: To provide a composition controlled in a thermal cross-linking rate.SOLUTION: A thermally cross-linkable composition comprises at least one cross-linking agent containing at least one epoxy group, an accelerator represented by general formula (I): RRN-CRR-CRR-(CRR)-NRR[wherein, groups R, R, Rand Rare mutually independently a hydrogen atom, substituted or non-substituted 1-8C alkyl or cycloalkyl, or 1-8C alkylene bound to the main chain; at least one of R, R, Rand Ris not the hydrogen atom; R, R, R, R, Rand Rare mutually independently the hydrogen atom, or 1-8C alkyl, or form 5-7C-membered cycloalkylene; and n is an integer of 0-4], and a polyacrylate having a functional group suitable for cross-link-reacting with an epoxy group.
Abstract:
PROBLEM TO BE SOLVED: To provide an acrylate based thermally crosslinked polymer (especially pressure-sensitive adhesive) for an especially strong adhesion double-sided pressure-sensitive tape. SOLUTION: In the double-sided adhesive tape including a viscoelastic first polymer layer, a second polymer layer on the upper surface of the viscoelastic first polymer layer and a third polymer layer on the lower surface, the viscoelastic first polymer layer is based on a polymer obtained by polymerizing a monomer composition of 65-97 wt.% ethyl hexyl acrylate and/or butyl acrylate, 0-30 wt.% methyl acrylate and 3-15 wt.% acrylic acid and a viscoelastic intermediate layer is crosslinked, and the second polymer layer is based on a polymer obtained by polymerizing a monomer composition of 85-95 wt.% ethyl hexyl acrylate and/or butyl acrylate, 5-15 wt.% acrylic acid, and the second polymer layer is crosslinked without an accelerator while adding at least one epoxy cyclohexyl derivative. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To achieve enhanced, and more particularly more stable, adhesive bonds or seals of substrates having different characteristics under a thermal load.SOLUTION: This aim is accomplished by provision of an adhesive tape having a thickness of at least 150 μm and exhibiting, after storage at 120-150°C over 60 to 210 days, extendability to at least three times its original length in the longitudinal direction.
Abstract:
PROBLEM TO BE SOLVED: To provide a controlled thermal crosslink.SOLUTION: A problem is solved by providing a crosslinking agent-accelerator system for thermally crosslinking a polyacrylate having a functional group which is suitable for crosslinking reaction with an epoxy group. The crosslinking agent-accelerator system includes: at least one kind of substance (crosslinking agent) having at least one epoxy group; and at least one kind of substance represented by general formula (I) NR[wherein the groups R's mutually independently represent a hydrogen atom or an organic group having 1-20 carbon atoms, and at least one of the groups R's is an organic group which has 1-20 carbon atoms and contains at least one alcoholic OH group].
Abstract:
PROBLEM TO BE SOLVED: To provide a thermal crosslinking method of an adhesive in which cross-linkage is covalently bonding and reversible (started by chemical or physical stimulation).SOLUTION: A crosslinkable adhesive mixture includes at least one polymer functionalized by an organic and/or inorganic acidic unit including OH group and at least one cyclic phosphoric anhydride. The cyclic phosphoric anhydride is a cyclic 2,4,6-substituted 1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide.
Abstract:
PROBLEM TO BE SOLVED: To provide, as an adhesive tape consisting of a support material and a pressure-sensitive adhesive coated on at least one surface of the support material, an adhesive tape exhibiting favorable adhesive forces atop low-energy surfaces such as automotive coats and automotive paints, resistant to low-temperature impacts, and exhibiting a sufficient cohesiveness even at a high temperature.SOLUTION: The adhesive tape of the present invention includes a support material consisting of an acrylate-based foam layer, and at least one pressure-sensitive adhesive layer is coated atop the former, whereas the pressure-sensitive adhesive of this adhesive tape (d) is constituted by a mixture of at least two types of different synthetic rubbers, above all synthetic rubbers including vinyl-aromatic block copolymers as bases, (e) includes a resin insoluble with the acrylate forming the foam layer, and (f) is not chemically cross-linkable.
Abstract:
PROBLEM TO BE SOLVED: To optimize manufacturing of a polyacrylate for the recovery of a solvent. SOLUTION: This method uses an amino acid as a regulator substance, under radical polymerization of a monomer mixture containing at least 70 wt.% of at least one acrylate and/or a methacrylate, and a reaction solution containing one kind or the plurality of kinds of solvents and one kind or a plurality of kinds of monomers, wherein at least 50 wt.% of the solvents is an organic solvent, and wherein at least 70 wt.% of the monomers is the acrylate and/or the methacrylate, and at least one kind of amino acid is additionally exists. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a processable and thermally cross-linkable polymer from a fused material giving sufficiently a long pot life in comparison with that of a known system cross-linking by heat for processing from the fused material, particularly for a corresponding polymer hot melt. SOLUTION: The process for production of a uniformally cross-linked polymer is performed by addition of at least one cross-linking agent to a fused state polymer, further processing of the polymer from the fused material and induction of a thermal cross-linking reaction with a cross-linking agent, wherein at least a part of the cross-linking reaction is conducted after further processing at a lower temperature than the fusing temperature of the polymer, and the cross-linking agent has at least a bifunctional compound and at least one kind of the bifunctional group represents an oxazoline group, and the polymer has a functional group linkable in a sense of a thermal cross-linking reaction with the oxazoline at a temperature lower than the fusion temperature of the polymer. COPYRIGHT: (C)2010,JPO&INPIT