摘要:
The invention refers to salts of at least one imidazole of the general formula (I), in which R1, R2, R3 and R4 are the same or different and denote hydrogen, an alkyl residue having 1 to 20, preferably 1 to 10, more preferably 1 to 4 carbon atoms, or a substituted or unsubstituted aryl or arylalykl residue having 6 to 10 carbon atoms, and at least one aliphatic or aromatic mono- or dicarboxylic acid. The molar ratio of carboxylic acid to imidazole, based on the functionality of the acid, is 1:1.1 to 1:6. The invention also relates to a method for manufacturing the imidazole salts, to their use, and to epoxy resin compositions containing said salts.
摘要:
Curable compositions are provided which contain a curable component and particular m-hydroxybenzene derivatives, wherein such derivatives function as aging inhibitors. Such curable compositions are useful as coating agents and adhesives having improved aging resistance.
摘要:
Curable compositions are provided which contain a curable component and particular m-hydroxybenzene derivatives, wherein such derivatives function as aging inhibitors. Such curable compositions are useful as coating agents and adhesives having improved aging resistance.
摘要:
The present invention relates to a curable composition, comprising specific meta-substituted aromatic compounds and at least one benzoxazine compound. In particular, the invention relates to the use of said meta-substituted aromatic compounds as curatives/catalysts for benzoxazine-containing compositions.
摘要:
The invention relates to a curable composition comprising: at least one benzoxazine and at least one toughening additive which can be bound to the at least one benzoxazine in the curing process, characterized in that the toughening additive is distributed in the cured composition in form of discrete domains, and that at least 50% of the discrete domains related to the total amount of discrete domains have a maximum length in any direction of space in the range of 10 nm to 500 nm as determined by transmission electron microscopy (TEM).
摘要:
The subject matter of the invention is an innovative method for the separation of polymer systems regarding their molecular weight, chemical structure, chain architecture, and colloidal additives. Such separations are currently accomplished by selective precipitation from solution, by a fractionated crystallization also from solution, and by means of gel chromatographic methods.The invention pertains to a separation of polymer systems by means of permeation through polymer films—semi-crystalline, cross-linked, amorphous—with thicknesses in a nanometer scale. The restriction to thicknesses in a nanometer scale is essential for a high throughput of polymers. Of particular significance is the selectivity towards colloidal additives with a structure that is not in chain form.
摘要:
The invention relates to a curable benzoxazine macromonomer containing at least 3 benzoxazine rings and at least one aliphatic, heteroaliphatic, araliphatic, hetereoaraliphatic, aromatic or heteroaromatic fragment, the fragment comprising a shortest atom chain containing at least 40 consecutive atoms between two benzoxazine nitrogen atoms or between two benzoxazine oxygen atoms, and said atom chain must not include any oxazine ring atoms (“soft fragment”). The invention further relates to cured products made thereof and a method or producing the same.
摘要:
The present invention relates to curable compositions comprising (a) N-arylated benzoxazines, and (b) a prepolymer produced from a diisocyanate having two isocyanate groups with different reactivity. The compositions are particularly suitable in the production of adhesives and sealants, prepregs and towpreg.
摘要:
The present invention relates to curable compositions comprising (a) at least one benzoxazine component selected from the group consisting of N-alkyl and N-alkenyl benzoxazines, and (b) a prepolymer produced from a diisocyanate. The compositions are particularly suitable in the production of adhesives and sealants, prepregs and towpregs.
摘要:
The invention relates to a curable benzoxazine macromonomer containing at least 3 benzoxazine rings and at least one aliphatic, heteroaliphatic, araliphatic, hetereoaraliphatic, aromatic or heteroaromatic fragment, the fragment comprising a shortest atom chain containing at least 40 consecutive atoms between two benzoxazine nitrogen atoms or between two benzoxazine oxygen atoms, and said atom chain must not include any oxazine ring atoms (“soft fragment”). The invention further relates to cured products made thereof and a method or producing the same.