Abstract:
The invention relates to a method for producing homopolymers and copolymers of isobutene by the continuous cationic polymerization of isobutene or mixtures of isobutene with ethylenically unsaturated comonomers in the presence of an initiator system comprising: i) a Lewis acid selected among covalent metal-halogen compounds and covalent semimetal-halogen compounds; ii) at least one aprotic organic compound (I) having at least one functional group (FG) which, under polymerization conditions, forms a carbocation or a cationogenic complex with the Lewis acid, in an organic solvent that is inert to the Lewis acid. The inventive method is characterized in that the polymerization is carried out in a tubular continuous flow reactor that has a number of bends with an alternating bending direction.
Abstract:
The invention relates to a polymerization method for isobutene or mixtures of isobutene with ethylenically unsaturated comonomers under the conditions of a living cationic polymerization . According to the invention, the initiator system additionally comprises at least one non-polymerizable aprotic silicon-organic compound having at least one Si-O bond.
Abstract:
The invention relates to a polymer composition containing at component that contains at least one polyisobutene based on one middle molecular weight polyisobutene and at least another polymer different therefrom.
Abstract:
A molding composition is described and comprises a mixture of interpenetrating polymers. A first phase comprises a crosslinked isobutene polymer, and a second phase encompasses a reinforcing polymer comprising (meth)acrylic and/or vinylaromatic units. The first phase is the reaction product of an isobutene polymer having an average of at least 1.4 functional groups in the molecule and of a crosslinking agent having an average of at least two functional groups in the molecule, the functionality of these being complementary to that of the functional groups of the isobutene polymer. The molding composition is particularly suitable for the roofing of buildings, or as impact-modified polystyrene or polymethyl methacrylate.
Abstract:
The present invention relates to a process for preparing an isobutene polymer using a cyclopentene derivative as initiator and to the isobutene polymer obtainable by means of the process and to particular functionalization products thereof.
Abstract:
alpha-Chloroisopropyl-substituted aromatics are obtained in high yield by treating isopropenyl-substituted aromatics with hydrogen chloride gas in the absence of a solvent. The alpha-chloroisopropyl-substituted aromatics serve as initiators for the cationic polymerization of isobutene.
Abstract:
The invention relates to a polymer composition containing at component that contains at least one polyisobutene based on one middle molecular weight polyisobutene and at least another polymer different therefrom.
Abstract:
A polymer composition comprises at least one polyisobutene-containing component based on a medium molecular weight, reactive polyisobutene and at least one further polymer which is different therefrom.
Abstract:
The present invention relates to a process for preparing an isobutene polymer using a cyclopentene derivative as initiator and to the isobutene polymer obtainable by means of the process and to particular functionalization products thereof.
Abstract:
Polyurethane foam material (I) (obtained by reacting polyisocyanate (A) with polyol (B) containing encapsulated latent heat storage (C), where the capsules are in the form of particle size distribution, where the average particle diameter of the distribution (Dm) is 1-20 mu m and at least 80% of particles (related to 100% of the particles) present in the distribution have a diameter of 0.2-3 Dm) is new. Independent claims are also included for: a car seat or a mattress comprising (I).