Abstract:
Disclosed is the production of isobutylene homopolymer or copolymer derivatives comprising a hydrophobic polyisobutylene polymer residue that has a number average molecular weight of 110 to 250,000 and low-molecular polar groups containing amino functions, nitro groups, hydroxyl groups, mercaptan groups, carboxylic acid or carboxylic acid derivative functions, sulfonic acid or sulfonic acid derivative functions, aldehyde functions and/or silyl groups. According to the invention, isobutylene or a monomer mixture containing isobutylene is polymerized in the presence of an iron halide donor complex acting as a polymerization catalyst, an aluminum trihalide donor complex or an aluminum alkyl halide donor complex containing an organic compound having an ether function or a carboxylic acid ester function as a donor, or a Lewis acid complex containing organic sulfonic acids and optional donors, the resulting highly reactive isobutylene polymer is reacted with a compound introducing the low-molecular polar group or a substructure thereof, and in case the reaction is performed using a substructure, the formation of the low-molecular polar group is completed by performing successive reactions.
Abstract:
A method for the removal of isobutene oligomers from an isobutene polymer is disclosed, wherein the isobutene polymer is stripped with vapours of a saturated hydrocarbon having at least 8 carbon atoms and the isobutene oligomers are at least partly driven off. Problematic isobutene oligomers are largely removed without affecting the reactivity of the isobutene polymer (expressed as content of methylidene double bonds).
Abstract:
The invention relates to diblock copolymers of formula A-B which are constituted of a polymer block A which is substantially constituted of α-olefin entities with 6 to 22 carbon atoms, and a polymer block B which is substantially constituted of isobutene entities. The invention also relates to a method for producing said diblock copolymers, to their use in lubricant compositions and to lubricant compositions containing said diblock copolymers.
Abstract:
The invention relates to a semi-interpenetrated network having a first phase of a linear uncured isobutane polymer and a second phase of a cross-linked polymer, the cured polymer being obtained by networking buildup reaction in the presence of the isobutane polymer. The cross-linked polymer is preferably obtained by radical polymerization of ethylene unsaturated monomers comprising at least one multiple ethylene unsaturated monomer. The networks are suitable as a molding material having a gas and moisture barrier effect, or as adhesives.
Abstract:
The invention relates to a method for producing mainly ethylenically unsaturated isobutene polymers, wherein the sum of proportions of molecules with a double bond in an α position and molecules with a double bond in a position β is increased to 75 %mol by polymerising isobutene in a liquid phase in the presence of a diluted or dispersed catalyst complex which comprises (i) an electron donor and (ii) a compound of general formula (I) Ha Meb [MFx]c, wherein Me is a metal with oxidation state m, M is an element selected from elements of the groups 2, 3, 4, 5, 10, 11, 13, 14 or 15 of the periodic table according to the IUPAC notation of an element oxidation number n, a is an integer ≥1, b is an integer ≥0, x is an integer ≥2 and c is [(a+mb)/(x-n)]. The catalyst is preferably embodied in the form of HBF4 O(CH3)2. The inventive method makes it possible to obtain an isobutene polymer having a low fluorine-content even using technical C4 hydrocarbon portions as an isobutene source.
Abstract:
A method for the removal of isobutene oligomers from an isobutene polymer is disclosed, wherein the isobutene polymer is stripped with vapours of a saturated hydrocarbon having at least 8 carbon atoms and the isobutene oligomers are at least partly driven off. Problematic isobutene oligomers are largely removed without affecting the reactivity of the isobutene polymer (expressed as content of methylidene double bonds).
Abstract:
The invention relates to the use of tetrahydrobenzoxazines (I), where R1 = a hydrocarbon group and R2, R3, R4 and R5 independently = H, OH or hydrocarbon and R2 to R5 can also form a second and a third tetrahydrooxazine ring with the proviso that at least one of the substituents has 4 to 3,000 carbon atoms and the remaining substituents, when hydrocarbon groups have 1 to 20 carbon atoms, as stabilisers for the stabilisation of inanimate organic materials, in particular turbine fuels against the effects of light, acid and heat.