摘要:
The present invention refers to diene-based unsaturated polymer latex particles having a particle size measured as d 90 -value of less than 60nm and a method for their production.
摘要:
A technique of improving the hydrogenation reaction of diene-based polymers, present in aqueous suspension, by in-situ synthesizing the catalyst in the presence of a specific aliphatic alcohol is disclosed. The process allows the selective hydrogenation of the carbon-carbon double bonds in the diene-based polymers with a high degree of hydrogenation and short reactions times. The improved process eliminates the complicated catalyst synthesis operations so far necessary.
摘要:
The present invention relates to curing of polymers, particularly to self curing of polymers. The present invention provides a process for curing of copolymers of isoolefins and olefinic monomers. The process includes the step of reacting the copolymer with an azidation reagent to form an azidated copolymer and then heating the azidated copolymer at a suitable temperature to cure the polymer.
摘要:
The present invention refers to diene-based unsaturated polymer latex particles having a particle size measured as d 90 -value of less than 60 nm and a method for their production. Methods for using the diene-based polymer latex as rubber and for conversion to hydrogenated polymers, with reduced gel formation, are also disclosed.
摘要:
On décrit une pluralité de polypeptides dérivés des espaces intercellulaires de cellules de végétaux possédant une résistance au givre. Certains de ces polypeptides servent à la nucléation de la glace pour la création de cristaux de glace dans les espaces extracellulaires des tissus des végétaux: d'autres polypeptides ont une fonction antigel pour réguler la croissance des cristaux de glace dans les espaces extracellulaires, et d'autres polypeptides encore sont des enzymes qui adaptent les parois des cellules des végétaux de manière à fonctionner de manière différente pendant la formation des cristaux de glace dans les espaces intercellulaires. Les poids moléculaires du groupe de polypeptides sont: 5 kD, 9 kD, 11 kD, 22 kD, 24 kD, 30 kD, 36 kD, 60 kD et 68 kD.
摘要:
The present invention relates to a process for the hydrogenation of the carbon-nitrogen triple bonds (nitrile groups) in hydrogenated butadiene rubber (HNBR) and for the tandem hydrogenation of carbon-nitrogen triple bonds and carbon-carbon double bonds (olefinic groups) in nitrile butadiene rubber (NBR) in solution form by treatment of the polymer with hydrogen in the presence of a ruthenium or rhodium catalyst and a basic reagent.