Abstract:
Copolymers of fluorinated polydienes and sulfonated polystyrene and their use in fuel cell membranes, batteries, breathable chemical-biological protective materials, and templates for sol-gel polymerization.
Abstract:
La présente invention se rapporte à des polymères blocs branchés, aux compositions de caoutchouc les contenant, utilisables notamment pour la fabrication de pneumatiques ou de produits semi-finis pour pneumatiques. Elle concerne également des procédés de préparation desdits polymères et compositions.
Abstract:
An organolithium compound represented by the following general formula (i): (i) [wherein A represents a heteroatom selected among oxygen, nitrogen, sulfur, and phosphorus; Ar represents optionally substituted aryl; R represents C1-10 alkyl; R represents C1-10 alkylene; R represents C1-10 alkyl or a protective group for the functional group -A-H (A is the heteroatom); and when the heteroatom A is oxygen or sulfur, then m and n each is 0 or 1, provided that the sum of m and n is 1, and when the heteroatom A is nitrogen or phosphorus, then m and n each is 0, 1, or 2, provided that the sum of m and n is 2], which has not hitherto been used in anionic polymerization, is used as an anionic polymerization initiator to easily and smoothly produce a polymer having a functional group at an end.
Abstract translation:由以下通式(i)表示的有机锂化合物:(i)[其中A表示选自氧,氮,硫和磷的杂原子; Ar表示任选取代的芳基; R 1表示C 1-10烷基; R 2表示C 1-10亚烷基; R 3表示C 1-10烷基或官能团-A-H(A为杂原子)的保护基; 当杂原子A为氧或硫时,m和n各自为0或1,条件是m和n之和为1,当杂原子A为氮或磷时,m和n分别为0,1或 或2,条件是m和n的总和为2],其迄今尚未用于阴离子聚合中,用作阴离子聚合引发剂以容易且平稳地制备末端具有官能团的聚合物。
Abstract:
A molding of thermoplastic elastomer composition that while exhibiting low hardness, is excellent in compression set and has satisfactory tensile strength. In particular, a molding of thermoplastic elastomer composition comprising (a) 55 to 95 wt.% of aromatic vinyl-isoprene block copolymer having two or more polyaromatic vinyl blocks of 14,000 to 100,000 weight average molecular weight, (b) 0 to 40 wt.% of aromatic vinyl-isoprene diblock copolymer and (c) 5 to 33 wt.% of polyisoprene of 5000 to 300,000 weight average molecular weight, wherein the content of aromatic vinyl monomer units is in the range of 14 to 30 wt.% based on the total weight of components (a), (b) and (c). This molding can be widely employed in various uses where the characteristics thereof are useful, such as roll members, e.g., form advance roll and paper feed roll of OA equipment and office machines.
Abstract:
The present invention relates to a butadiene/isoprene/aromatic vinyl hydrocarbon sevenblock copolymer and the process to prepare the copolymer. Said block copolymer have the following structure: Z-XZ-X-Y-X-XZ-Z, wherein Z is aromatic vinyl hydrocarbon polymer block, X and Y are selected from butadiene and isoprene polymer block, but they are different from each other, XZ is tapered copolymer block of aromatic vinyl hydrocarbon and butadiene or isoprene, aromatic vinyl hydrocarbon repeated units are 10-50 wt.% of the block copolymer, butadiene repeated units are 10-75 wt.% of the block copolymer, isoprene repeated units are 10-75 wt.% of the block copolymer.
Abstract:
This invention includes a process for forming a thermoplastic vulcanizate comprising: (a) admixing a C-H insertion curing agent with at least one elastomeric phase polymer to form a first admixture; (b) admixing at least one non-elastomeric polyolefin with the first admixture to form a second admixture; and (c) heating the second admixture to a temperature at least the decomposition temperature of the curing agent to crosslink the elastomeric phase while mixing the admixture to an extent sufficient to result in the formation of a thermoplastic material, hereinafter referred to as a thermoplastic vulcanizate, and optionally including an additional step (d) of shaping the resulting thermoplastic vulcanizate, especially by heating and foaming or molding the TPV. The C-H insertion curing agent is preferably selected from alkyl and aryl azides (R-N3), acyl azides (R-C(O)N3), azidoformates ((R-O-C(O)-N3), sulfonyl azides (R-SO2-N3), phosphoryl azides (RO)2-(PO)-N3), phosphinic azides (R2-P(O)-N3) and silyl azides (R3-Si-N3), with poly(sulfonyl azide) most preferred. Additionally, the invention includes a thermoplastic vulcanizate comprising a blend of: (1) an elastomeric phase crosslinked using a C-H insertion curing agent dispersed in; (2) at least one non-elastomeric thermoplastic polyolefin. The invention also includes a foamable composition comprising (1) an elastomeric phase crosslinked using a C-H insertion curing agent dispersed in; (2) at least one non-elastomeric thermoplastic polyolefin; and (3) from 0.1 to 25 percent by weight based on the combined weight of components (1) and (2) of at least one foaming agent as well as a fabricated part, cable jacket, cable insulation, or foam comprising the thermoplastic vulcanizate or the invention or resulting from the process of the invention.
Abstract:
The present invention is a process for producing a tapered block polymer which comprises optionally anionically polymerizing styrene to form a homopolymer block of polystyrene, anionically polymerizing isoprene to form a homopolymer block of polyisoprene, and anionically copolymerizing a mixture of styrene and isoprene to form a tapered copolymer block wherein each of the monomers styrene and isoprene is introduced at a rate of 15 % to 75 % by weight of the total tapered block monomer charge per minute and the weight ratio of the styrene to the isoprene is from 0.5:1 to 1.5:1. The process produces a unique polymer containing a tapered polymer block of styrene and isoprene which has a specific taper structure consisting of small segments of variable size of styrene monomers and isoprene monomers.
Abstract:
A process for producing an epoxidized block copolymer appropriate for modifying agents or modifying aids for rubbery polymers or resinous polymers, adhesives, sealants, etc. The process comprises epoxidizing a block copolymer which may be partly hydrated and comprises a polymer block (A) containing a vinyl aromatic hydrocarbon compound as the main component and another polymer block (B) containing a conjugated diene compound as the main component to thereby synthesize an epoxidized block copolymer (C) and then recovering this polymer from a slurry or solution thereof in an organic solvent by steam stripping in the presence of a surfactant. It is preferably that the surfactant is a nonionic one, in particular, one represented by the general formula: HO(C2H4O)a(C3H6O)b(C2H4)cOH, wherein a, b and c represent each a number of 1 to 1,000, having an average molecular weight of 3,000 to 20,000 and containing 20 to 90 % by weight of polyoxyethylene. According to the process, the epoxidized block copolymer product can be easily recovered from the reaction mixture without giving any prolonged heat history and thus the epoxy group can be prevented from undergoing ring opening. Also, it is possible to obtain an epoxidized block copolymer having such an epoxy equivalent as to give a high elasticity and the characteristics of epoxy compounds.
Abstract translation:用于制备适于改性剂或用于橡胶状聚合物或树脂聚合物,粘合剂,密封剂等的改性助剂的环氧化嵌段共聚物的方法。该方法包括使可部分水合的嵌段共聚物环氧化,并且包含聚合物嵌段(A) 乙烯基芳族烃化合物作为主要成分,另一种以共轭二烯化合物为主要成分的聚合物嵌段(B),由此合成环氧化嵌段共聚物(C),然后由有机溶剂中的浆料或其溶液中回收该聚合物, 在表面活性剂存在下蒸汽汽提。 优选表面活性剂是非离子表面活性剂,特别是由以下通式表示的表面活性剂:HO(C 2 H 4 O)a(C 3 H 6 O)b(C 2 H 4)c OH,其中a,b和c各自表示1至1,000个, 平均分子量为3,000〜20,000,含有20〜90重量%的聚氧乙烯。 根据该方法,可以容易地从反应混合物中回收环氧化嵌段共聚物产物,而不会产生任何长时间的热历史,从而可以防止环氧基发生开环。 此外,可以获得具有这样的环氧当量的环氧化嵌段共聚物,以提供高弹性和环氧化合物的特性。