Showing papers on "Styrene-butadiene published in 1981"
Patent•
17 Sep 1981
TL;DR: In this paper, a high vinyl polybutadiene or styrene-butadienes copolymer was obtained by polymerizing 1,3 butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator and coupling the resulting polymer.
Abstract: OF THE DISCLOSURE High vinyl polybutadiene or styrene-butadiene copolymer obtained by polymerizing 1,3-butadiene alone or with styrene in a hydrocarbon solvent using an organolithium compound as an initiator and coupling the resulting polymer, characterized in that (1) the polybutadiene or styrene-butadiene copolymer comprises at least 20% by weight of a polymer having in its molecular chain a linkage between butadienyl and at least one element selected from the group consisting of silicon, germanium, tin and lead, (2) the styrene content of said copolymer is 40% by weight or less, and (3) the polybutadiene or the butadiene portion of the styrene-butadiene copolymer has a vinyl content of 50 to 95%. Said polybutadiene or sytrene-butadiene copolymer has a low rolling resistance, high wet skid resist-ance, highly improved fracture property and, an excellent processability.
104 citations
Patent•
15 Dec 1981
TL;DR: In this paper, a block copolymer with a Mooney viscosity (ML 1+4, 100° C) of 10 to 150 blocks was proposed, where the total vinyl content in the whole bound butadiene is 30 to 70% and the total bound styrene content is 10 to 40% by weight.
Abstract: A styrene-butadiene block copolymer having a Mooney viscosity (ML1+4, 100° C.) of 10 to 150 comprising two specific random styrene-butadiene copolymer blocks different in bound styrene content and in vinyl content in the butadiene portion, and optionally polybutadiene blocks, wherein the total vinyl content in the whole bound butadiene is 30 to 70% and the total bound styrene content is 10 to 40% by weight. Said block copolymer is excellent in wet skid resistance and rolling resistance, well-balanced in fracture and wear characteristics and also satisfactory in processability and cold flow property.
34 citations
Patent•
16 Dec 1981TL;DR: A random SBR with excellent tensile strength, resilience, and abrasion resistance as well as a reduced heat buildup property, which comprises 10% to 40% by weight of styrene units and the balance of butadiene units and has a Mooney viscosity of 30 to 150, was presented in this article.
Abstract: A random SBR having excellent tensile strength, resilience, and abrasion resistance as well as a reduced heat buildup property, which comprises 10% to 40% by weight of styrene units and the balance of butadiene units and has a Mooney viscosity of 30 to 150; a content of butadiene units having 1,2-vinyl structure of 60% or less; a ratio Mw/Mn of from 1.2 to 3.5; and a content of isolated styrene units of 40% or more and a content of another styrene units in long chain block form of 5% or less, both contents being determined by decomposing the copolymer with ozone and by applying a gel permeation chromatographic analysis to the ozone decomposition product.
33 citations
Patent•
15 Apr 1981
TL;DR: In this paper, random copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator and a Lewis base and, if necessary, an anionic surface active agent containing --SO3 M or --OSO3 M (wherein M is Na, K, Rb or Cs).
Abstract: Styrene-butadiene random copolymers having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML1+4, 100° C.) of 10 to 150, and a styrene content of about 3 to 30% by weight. They are prepared by copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator and a Lewis base and, if necessary, an anionic surface active agent containing --SO3 M or --OSO3 M (wherein M is Na, K, Rb or Cs) under temperature-raising conditions. They are rubber materials having low rolling resistance and high wet skid resistance.
32 citations
01 Jan 1981
TL;DR: In this article, the historical development of SBR including trends in manufacturing methods is outlined, and the properties of the polymer are compared with those of natural rubber with a focus on its processability.
Abstract: The historical development of SBR including trends in manufacturing methods is outlined. Variables in micro- and macro-structure are analysed and the properties of the polymer are compared with those of natural rubber. The processability of SBR is considered in some detail and attention is given to recent methods of assessing mixability and other processing characteristics.
15 citations
TL;DR: In this paper, the flow behavior of carbon black loaded styrene-butadiene (SBR)-cis-polybutadienes (BR) is investigated as a function of mixing and the location of the carbon black.
Abstract: The flow behavior of carbon black loaded styrene-butadiene (SBR)-cis-polybutadiene (BR) is investigated as a function of mixing and the location of carbon black. The blends consist of an 80:20 weight ratio of SBR and BR with the incorporation of 20 phr carbon black via three different schemes to control the location of carbon black in the individual rubber phases. These are: (A) free black mixing of the three components, (B) mixing of SBR-black masterbatch with BR, and (C) mixing of BR-black masterbatch with SBR. Dynamic Mechanical Analysis (DMA) was used to characterize carbon black distribution. The damping characteristics indicate that when carbon black is masterbatched into either one of the rubbers, it continues to remain incorporated in that particular rubber phase upon blending with the second rubber. The flow behavior is measured with an Instron capillary rheometer. The results indicate that the viscosity function of these blends is not sensitive to the mixing conditions. However, the elasticity is always, dependent on mixing. Elasticity is expressed as ΔPe/σ, where ΔPe is the entrance pressure drop from the Bagley plot and σ the shear stress. In general, ΔPe/σ of the blend decreases with increasing mixing.
13 citations
TL;DR: In this paper, the 1 H-NMR spectra of styrene oligomers were measured as a model of the styrene sequences in SBR and the ortho-phenyl proton, methine proton and methylene proton signals shifted to a higher magne...
Abstract: The 1 H-NMR spectra of styrene oligomers were measured as a model of styrene sequences in SBR. The ortho-phenyl proton, methine proton, and methylene proton signals shift to a higher magne...
12 citations
TL;DR: In this paper, the effect of curing temperature and curing system on the network structure and technical properties of polybutadiene (BR) and styrene butadiene rubber (SBR) has been studied.
Abstract: The effect of curing temperature and curing system on the network structure and technical properties of polybutadiene (BR) and styrene–butadiene rubber (SBR) has been studied. The technical properties have been correlated with the network structure. For example, better dynamic properties like resilience, heat buildup, and set values of the efficiently vulcanized BR system can be ascribed to lower sulfur inefficiency and simpler network structure. Again, higher compression set values of the SBR mixes are due to lower crosslink density and higher proportion of polysulfidic crosslinks.
11 citations
07 Oct 1981
10 citations
Patent•
30 Nov 1981
TL;DR: In this paper, a high-styrene content styrene/butadiene copolymer for tire tread rubber was proposed, where a polymer having tin-carbon bonds (e.g., a tinbutadienyl bond) is present in the main chain in an amount of above 30wt.
Abstract: PURPOSE: The titled copolymer for tire tread rubber good in resilience and excellent in wet skid property, abrasion property, etc., containing tin-carbon bonds in the main chain. CONSTITUTION: A high-styrene content styrene/butadiene copolymer wherein a polymer having tin-carbon bonds (e.g., a tinbutadienyl bond) is present in the main chain in an amount of above 30wt%, the styrene content of the copolymer is 25W60wt% and the vinyl content of the butadiene portion is 30W50wt%. The above copolymer is produced by copolymerizing 1,3-butadiene with styrene in a hydrocarbon solvent by using an organolithium compound (e.g., n-butyllithium) as a catalyst (a Lewis acid can also be used as a structure modifier), adding a tin halide (e.g., tin tetrachloride) and coupling it with the living polymer. COPYRIGHT: (C)1983,JPO&Japio
8 citations
Patent•
17 Jun 1981TL;DR: In this article, a carboxylated styrene butadiene copolymer latex is used to extend and stiffen carpet backing adhesive containing a CARO-CARO.
Abstract: Corn syrup is used to extend and stiffen carpet backing adhesive containing a carboxylated styrene butadiene copolymer latex.
Patent•
27 May 1981
TL;DR: In this paper, a crosslinked acrylic styrene butadiene copolymer is used to impregnate a needle punching with a material having high resistance to abrasion.
Abstract: It comprises at least two textile layers (1, 2) mutually needled, the upper face of the upper layer via which the needle punching being impregnated with a material (4) capable of forming a film having particularly high resistance to abrasion, especially a crosslinked acrylic styrene butadiene copolymer. The textiles used are of the short fibers entangled and / or continuous fibers. Use: Dressing rooms for pets.
TL;DR: In this article, the heterogeneity of these networks and their dimensions have been determined by small-and larger-angle X-ray scattering; they were found to form on a supermolecular level.
Abstract: Mutually penetrating networks have been produced by an anionic mechanism for the first time from oligoacrylates and a styrene-butadiene copolymer. The heterogeneity of these networks and their dimensions have been determined by small- and larger-angle X-ray scattering; they were found to form on a supermolecular level. The characteristics of this heterogeneous structure have been found to depend on the composition of the original oligomers, but also on the features of the network formation by a continuous anionic mechanism of polymerization and the method of the postpolymerization treatment of the samples.
Patent•
18 Nov 1981
TL;DR: In this paper, the authors proposed a method to provide nonstainability, and peeling resistance, increase affinity, and smooth affixing by disposing a polypropylene film on an original press-fixing surface, and thermally melting-sticking this to propylene rubber or the like.
Abstract: PURPOSE:To provide nonstainability, and peeling resistance, increase affinity, and smooth affixing by disposing a polypropylene film on an original press-fixing surface, and thermally melt-sticking this to propylene rubber or the like thereby forming a titled plate. CONSTITUTION:In the 1st process, a blend of unvulcanized rubber, particularly diene type rubber such as ethylene propylene rubber is laminated by coating or affixing on one surface or a polypropylene film of 0.1-0.3mm. thickness, after which these are heated under pressure from the outside surface to allow the film and the rubber to melt stick. Next, in the 2nd process, this product is cut to a required size, and in the 3rd process, it is affixed to a base body. The base body is formed of ethylene butadiene rubber alone or the blend of this and diene rubber such as styrene butadiene rubber. The possession of propylene components mutually by the rubber and the base body results in that the product of good affinity is yielded.