摘要:
This invention relates to the preparation of linear alpha-olefin oligomers and more particularly to the catalyst system which consists of a two component mixture comprising an aluminium halide and a compound capable of reacting with said aluminium halide and selected among(a) halogens or interhalogenic compounds,(b) halogenated compounds having the formula ##STR1## in which R', R", R'", represent H or alkyl or aryl (C) METAL HALIDESBy the above catalyst system oligomers can be prepared with high yields and with an easier control and performance of the reaction, starting from linear alpha-olefins having 3 to 12 carbon atoms.
摘要:
A method is described for the polymerization of isobutylene and, in particular, the copolymerization of isobutylene and isoprene to produce butyl rubber, by contacting the monomers with a catalyst prepared from: (a) an organoaluminum compound (e.g. Al(C.sub.2 H.sub.5).sub.2 Cl) and (b) a compound represented by the formula X'.sub.n M.sub.e Y.sub.m in which X' is a halogen atom; Y is oxygen, sulphur or a functional group selected from the alkoxies, esters, amides, simple or substituted alkyls, cycloalkyls, aromatics, arenes, phosphines, acetylacetones and oximes; Me is an element selected from Ti, Sn, Zn, B, Al, Hg, Pb, W, Sb, Ge, V, Zr, As, Bi and Mo; n and m are whole numbers whose sum equals the valence of Me except where Y is oxygen or sulphur, when the valency equals 2m + n, (e.g. Ti(O nC.sub.4 H.sub.9)Cl.sub.3), in a liquid reaction medium constituted by an aliphatic, aromatic, cycloaliphatic or halogenated hydrocarbon such as methyl chloride, and at a temperature in the range from -100.degree. to 30.degree.C.
摘要翻译:描述了用于异丁烯聚合的方法,特别是异丁烯和异戊二烯的共聚以制备丁基橡胶,方法是使单体与由(a)有机铝化合物(例如Al(C 2 H 5)2 Cl)和 (b)由式X'n Me Ym表示的化合物,其中X'为卤素原子; Y是氧,硫或选自烷氧基,酯,酰胺,简单或取代的烷基,环烷基,芳族化合物,芳烃,膦,乙酰丙酮和肟的官能团; Me是选自Ti,Sn,Zn,B,Al,Hg,Pb,W,Sb,Ge,V,Zr,As,Bi和Mo中的一种元素; n和m是总和等于Me的化合价的整数,除非是Y是氧或硫,当化合价等于2m + n时,例如Ti(O nC 4 H 9)Cl 3) 芳香族,脂环族或卤代烃如甲基氯,并且在-100至30℃的温度下。
摘要:
Oligomers are obtained from straight-chain alpha olefins by contacting these with a catalytic system of the binary type, which is composed of an organic metallic compound of aluminum and a haloid acid. Subsequent hydrogenation of the oligomers is carried out in order to remove possible residual unsaturations.
摘要:
A process is described whereby homopolymers and copolymers of isobutylene are prepared by effecting the polymerization at a temperature in the range of -100.degree. to 30.degree. C in the presence of a catalyst system including:(a) a compound selected from the group consisting of: AlCl.sub.3, AlBr.sub.3, AlEtCl.sub.2, TiCl.sub.4, SnCl.sub.4, SiCl.sub.4, VCl.sub.4, BF.sub.3, Al.sub.2 Et.sub.3 Cl.sub.3, SbCl.sub.5, SbF.sub.5, FeCl.sub.3, VOCl.sub.3, ZrCl.sub.4, AlI.sub.3, GaCl.sub.3 ; and(b) a compound adapted to react with the compounds of group (a) and selected from the group consisting of: SnR.sub.4, SnRX.sub.3, SrR.sub.4, TiX.sub.2 (OR).sub.2, Ti(OR).sub.4, PbR.sub.4, Ti(OR)X.sub.3, VO(OR).sub.3, Ti(OR).sub.3 X, (C.sub.5 H.sub.5).sub.2 Ti(C.sub.6 H.sub.5).sub.2, (C.sub.5 H.sub.5).sub.2 Ti(CH.sub.3).sub.2, Ti(Acac).sub.4, SnCl.sub.2 (acetate).sub.2 in which R is a hydrocarbon radical with from 1 to 10 carbon atoms and X is a halogen atom.The process is of particular value in the production of butyl rubber through the copolymerization of isobutylene and isoprene.
摘要:
The invention relates to the preparation of oligomers starting from linear alpha-olefins and to the subsequent hydrogenation thereof to saturated oligomers products, and more particularly to the catalyst system used in the oligomer preparation reaction, the catalyst system consisting of a first component selected amongst the halogenated organo-metal aluminium components, and a second component capable of reacting with the first one and chosen amongst halogens or interhalogenic compounds and metal halides; thus higher yields of oligomers, as well as an easier performance and a control of the reaction are achieved. In turn the hydrogenation step is carried out in the presence of a known hydrogenation catalyst, at a temperature of 150 to 300.degree. C and under a pressure of from 20 to 150 atmospheres.
摘要:
There is disclosed the coating of a metallic substrate with a cross-linked polymeric film by contacting the substrate with an aqueous composition containing:at least an acrylic or metacrylic compound which can be defined by the general formula: ##STR1## wherein: R is a straight-line or branched aliphatic hydrocarbon radical, either saturated or unsaturated containing from 2 to 10 carbon atoms, or a cycloaliphatic or an aromatic group;R.sub.1 and R.sub.2, equal to or different from one another, are straight-line or branched alkyl groups, either saturated or unsaturated and containing from 1 to 8 carbon atoms, or cycloaliphatic or aromatic groups;at least one unsaturated organic acid capable of being copolymerized with the compound (I), in an amount of from 5 to 40 parts by weight per 100 parts of the compound (I) or an organic or a mineral acid which cannot be copolymerized with the compound (I) in an amount of from 1 to 10 parts by weight per 100 parts of the compound (I), anda polymerization catalyst preferably selected from among the persulphates, the hydroperoxides, the peracids H.sub.2 O.sub.2 and the peroxides.A metallic substrate coated by the composition of polymeric nature as described above is then heated to a temperature equal to, or lower than 180.degree. C. approximately and for the time which is necessary to originate a polymeric film cross-linked upon said substrate.A film so deposited exhibits optimum properties as to adherence, resistance to bending and shocks and resistance to the saline mist.
摘要翻译:公开了具有交联聚合物膜的金属基材的涂层,其通过使基底与水性组合物接触,所述水性组合物含有至少一种丙烯酸或甲基丙烯酸酯化合物,其可以由以下通式定义:其中: R是含有2至10个碳原子的饱和或不饱和的直链或支链脂族烃基,或脂环族或芳族基团; R1和R2彼此相同或不同,是饱和或不饱和且含有1至8个碳原子的直链或支链烷基,或脂环族或芳族基团; 能够与化合物(I)共聚的至少一种不饱和有机酸,相对于每100份化合物(I)为5〜40重量份,或不与上述化合物(I)不共聚的有机或无机酸) 化合物(I)的量为每100份化合物(I)为1-10重量份,优选选自过硫酸盐,氢过氧化物,过酸H 2 O 2和过氧化物的聚合催化剂。 然后将如上所述的由聚合物性质的组合物涂覆的金属基材加热到大约等于或低于180℃的温度,并且在所需的时间内产生在所述基材上交联的聚合物膜。 如此沉积的薄膜表现出粘附性,抗弯曲性和抗冲击性以及耐盐雾性的最佳性能。
摘要:
A class of soluble polymers of high molecular weight is disclosed whose members are: copolymers of polycyclic polyenes containing two conjugated double bonds which are members of the group consisting of a) polycyclic polyenes having an endomethylenic system orthocondensed with another hydrocarbon ring wherein the two common carbon atoms form a part of a conjugated diene system whose double bonds are located inside the non-endomethylenic ring, b) polyenes presenting an alkylidene group conjugated with a double bond of a ring which forms a part of an endocyclic system, and c) orthocondensed polycyclic polyenes substituted with an alkylidene type ring whose double bond is conjugated with a double bond of one of the cycles; and homopolymers of at least one of said polycyclic polyenes with at least one other conjugated diene. They may be prepared by reacting the selected monomers in the presence of a cationic catalyst selected from the halides of metals of the second to eighth groups of the periodic system and the alkyl derivatives thereof, which may be complexed with water, alcohols, acids, ethers or alkylhalides.
摘要:
A composition based on aliphatic polycarbonates containing urethan groups and acrylic or metacrylic end groups, to be cross-linked in the presence of radicalic initiators for their functionalization with acrylic or metacrylic groups of a mixture composed of diols, polyols and their oligomeric derivatives terminated by OH groups and containing in their molecule carbonate groups and urethan groups.
摘要:
An expandable bladder for manufacturing pneumatic tyres is used in combination with a vulcanisation apparatus including, for example, a mould having a plurality of sidewall plates and tread sectors that, when the mould is closed, delimit a moulding cavity suitable for housing the green pneumatic tyre to be cured. The expandable bladder includes an elastomeric material obtained by curing an elastomeric composition which includes at least one butyl rubber and at least one compound having at least one double bond and an at least partially fluorinated alkyl or polyoxyalkylene chain.
摘要:
A method for coating various surfaces is disclosed, which comprises the step of preparing a mixture composed by at least one compound such as an epoxy-acrylic resin, a polyester alpha-omega-acrylate resin, an unsaturated polyester resin, or a urethane-acrylate resin and by at least one unsaturated compound of the amide, lactam, piperidone and urea classes and using said mixture for compounding a varnish to be applied to the selected substrate and then irradiated with an appropriate radiation (range 200 to 400 nm wavelength).