Polymerization of Diene Monomers by Ziegler Type Catalysis

1980 ◽  
Vol 53 (3) ◽  
pp. 71-79 ◽  
Author(s):  
S. E. Horne
Keyword(s):  
Natural Rubber ◽  
Laboratory Work ◽  
Price Ratio ◽  
Free World ◽  
Planned Economy ◽  
Rubber Industry ◽  
Synthetic Rubber ◽  
The World ◽  
Communist Countries ◽  
To Receive

Abstract I have not gone into compounding and testing results on polyisoprene and polybutadiene. As you well know, they are widely used in the rubber industry. From a technical standpoint, we know we can replace natural rubber with cis-polyisoprene. However, the profitability of the process is closely tied to the availability of isoprene monomer and the price ratio of cis-polyisoprene and natural rubber. Sometimes the economics is favorable and sometimes unfavorable. Consequently, polyisoprene expansion is slow in the Free World. In the Communist countries, however, the planned economy is pushing ahead with polyisoprene—projections for 1985 are for 817 000 metric tons versus 227 000 metric tons in the Free World. Is there a possibility of an entirely new synthetic rubber that will be the equal of polyisoprene, but more economical? Is there a blend of elastomers that will replace natural? Is there a chance the economics of polyisoprene might become more favorable? Certainly the answers pose a challenge to those of us in research. We cannot sit back and say we have reached the ultimate, for the world of the tire is constantly changing, and we must be able to meet the change. The work reported here could not have been carried out without the invaluable contributions of my colleagues at BFGoodrich. I wish to especially mention: Jim Shipman and Jack Kiehl for the early infrared work and claiming that I was trying to fool them with my first copolymer; Vern Folt, the enthusiastic section leader for the early project ; Earl Carlson, who elucidated the conditions for making trans-polyisoprene and trans-polybutadiene ; Dave Craig for supplying the pure isoprene for the early work; Bob Minchak and Harold Tucker for some of the cobalt studies and titanium studies; Harvey Scott for the cobalt chloridealuminum chloridethiophene catalyst; Ed Wilson and M. Reinhart for compounding studies; Waldo Semon and Carlin Gibbs for directing it all and allowing us such a free hand; Floyd Miller, who did such an outstanding job of scaling the process directly from a 50 g lab recipe to production size runs; and the numerous, capable technicians who have worked for me— they are the unsung heroes of the laboratory work. Let me say again how highly honored I feel to receive this award. I am accepting it for all at BFGoodrich, for it was truly a team effort.

Tack in Rubber

1964 ◽  
Vol 37 (5) ◽  
pp. 1178-1189 ◽  
Author(s):  
O. K. F. Bussemaker
Keyword(s):  
Natural Rubber ◽  
Theoretical Approach ◽  
Point Of View ◽  
Rubber Industry ◽  
Highly Active ◽  
Synthetic Rubber ◽  
The Usa ◽  
The Subject ◽  
The Difference ◽  
Definition Of

Abstract The expressions tack, tackiness, and stickiness have been in use since the beginning of the rubber industry. During the years their meaning has changed considerably. The first occasion where tackiness was mentioned was in the case of crude natural rubber. The surface of the rubber became tacky or sticky during storage. This phenomenon has been thoroughly discussed in the literature. As a general conclusion it was accepted that both oxidation and depolymerisation occurred. Three factors were reported to be the cause of these processes: light, traces of copper, and manganese. From our point of view we would call this effect stickiness, as we are only interested in the building tack of rubber. In the period when the only rubber was natural rubber and high loadings of highly active fillers were not generally used in compounds, building tack was no problem. Building tack was first mentioned in a publication by Griffith and Jones in 1928. They started their experiments by measuring tack in their search for methods to prevent cotton liners from sticking to unvulcanized rubber. One would have expected much work on the measurement and improvement of tack in Germany and Russia during the development of synthetic rubbers. However, this only proved to be the case in Russia. The first publication available was the translation of an article by Voyutskii and Margolina in 1957. From Voyutskii's work we were able to trace the first article in 1935 by Zhukov and Talmud, who studied the adhesive power of synthetic rubber. In the USA the first theoretical approach to the subject was by Josefowitz and Mark in 1942, who at that time did not realize the difference between stickiness and tack. This difference became clear when lack of tack became the big problem in the use of synthetic rubber. In many cases it was found that addition of resins and softeners gave a very sticky compound which had no building tack at all. The tack problem was first discussed at the ASTM symposium on the application of synthetic rubbers in 1944 by Juve who gave a definition of building tack. From that time, the problem has been studied regularly, especially from the practical side, to find ways and means to improve the building tack of synthetic rubbers.

Vistanex Polybutene—Rubber Blends

1941 ◽  
Vol 14 (2) ◽  
pp. 386-397 ◽  
Author(s):  
S. Longman
Keyword(s):  
Natural Rubber ◽  
Raw Materials ◽  
Petroleum Products ◽  
The Other ◽  
Partial Substitution ◽  
Manufacturing Equipment ◽  
Rubber Industry ◽  
Rubber Blends ◽  
Synthetic Rubber

Abstract From the foregoing data on blends of Vistanex Polybutene and rubber, it is evident that these two materials complement one another. Each has properties which the other lacks, and blends of the two can be made to emphasize the more desirable properties of either one. Extreme flexibility in compounding these blends is possible, since they are perfectly compatible in milled compounds. Therefore, great latitude is given in compounding of these blends to secure any range or degree of properties possible with either of the components. Vistanex Polybutenes should not be considered as synthetic rubber, because they will not vulcanize, and they lack certain characteristics of vulcanized natural rubber. More properly Vistanex Polybutenes should be considered as modifying agents for partial substitution of natural rubber. In many cases, this substitution of a part of the natural rubber in a compound by Vistanex Polybutene confers definite advantages and improves qualities of such compounds for special uses. Therefore, Polybutenes, even in normal times, have a very definite field of usefulness and, in the event that imports of natural rubber become restricted, the availability of the Vistanex Polybutenes in quantity will be of increasing importance to the rubber industry. Since the raw materials for the manufacture of Vistanex Polybutene are petroleum products, the availability of raw materials is a source of no difficulty in this country. Likewise, the manufacturing equipment is not excessively expensive, and, with expanded production, lowered prices may confidently be expected.

The Analysis and Forecast about the Supply and Demand of China's Rubber Raw Materials Based on Grey Model

2013 ◽  
Vol 404 ◽  
pp. 796-801
Author(s):  
Zhao Jun Wang ◽  
Zhou Lin ◽  
Shuai Liu
Keyword(s):  
Natural Rubber ◽  
National Economy ◽  
Raw Materials ◽  
Supply And Demand ◽  
Grey Model ◽  
Forecasting Model ◽  
Rubber Industry ◽  
Grey Forecasting ◽  
Synthetic Rubber ◽  
The Status

The rubber industry is an important sector in the national economy. The article took the natural rubber and synthetic rubber as the main studying objects to analyze and forecast the amount of supply and demand of Chinas rubber raw materials. Analyzed the status of supply and demand of Chinas rubber raw materials from 2006 to 2011, and established the Grey Forecasting Model to forecast the supply and demand from 2012 to 2017 in China, and concluded that the prosperous supply and demand of rubber raw materials would be continued in the future.

Knowledge Management of Net Requirements in Using Natural Rubber in Thai Rubber Industry to Support the Increase in Using Natural Rubber within Thailand

2016 ◽  
Vol 851 ◽  
pp. 117-121
Author(s):  
Pran Hanthanon ◽  
Thiti Kaisone ◽  
Chanon Wiphanurat ◽  
Tarinee Nampitch
Keyword(s):  
Nmr Spectroscopy ◽  
Natural Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Department Stores ◽  
Rubber Industry ◽  
H Nmr ◽  
Synthetic Rubber ◽  
Styrene Butadiene ◽  
C Nmr

A blend of natural rubber (NR) and styrene butadiene rubber (SBR) was tested against conventional rubber products sold in department stores and markets, using nuclear magnetic resonance (NMR) spectroscopy to measure the amount of natural or synthetic rubber in the product. 1H-NMR spectroscopy was employed for the rubber blend and 13C-NMR spectroscopy for conventional products. The chemical shift of all the samples from the structure of natural rubber (cis-1,4 polyisoprene) was observed.

Global Market Integration and China's Rubber Industry: Challenges and the Way Forward

2008 ◽  
Vol 36 (5) ◽  
pp. 792-826 ◽  
Author(s):  
Keyword(s):  
Natural Rubber ◽  
Market Integration ◽  
The Philippines ◽  
Global Market ◽  
Sustainable Growth ◽  
Production Sector ◽  
Rubber Industry ◽  
Rubber Production ◽  
Synthetic Rubber ◽  
Natural And Synthetic

AbstractThis paper, while reviewing the development and growth of the rubber production sector in China from a historical perspective, discusses the major challenges confronting the sustainable growth of rubber-based industries in the era of global market integration. The challenges arise from the growing shortage of resources (both natural and synthetic rubber) against the fast-growing automobile and tyre manufacturing industries. While the dynamic growth of the rubber industry in the pre-reforms era was achieved under a heavy import-oriented trade policy regime, the sustaining of the same is fraught with serious challenges in the context of market integration. Following a comprehensive analysis of the development of the rubber industry in retrospect, this paper suggests some important policy options for carrying forward and, thereby, sustaining the growth dynamism of the industry in the country in the emerging scenario. It emerges from the study that the sustainable growth of the rubber-based industry in China calls for a thorough revamping of state policies and devising new institutional development strategies covering a broad spectrum of activities, including: (a) demand and supply management; (b) redefining the status of natural rubber as a strategic commodity and industrial raw material; (c) restructuring the production sector favouring smallholder producers; and (d) R&D investments facilitating rubber expansion to agro-ecologically suitable areas. Given that global market integration would continue to stimulate the growth of the domestic rubber industry, this paper highlights that issues at the production sector are to be tackled on a priority basis. However, this would need China to make a rational choice between one or a combination of alternatives, including: (a) strengthening the existing domestic natural rubber production sector; (b) continue with the prevailing natural and synthetic rubber import policies; (c) increased substitution between natural and synthetic rubber; and (d) strengthening rubber investment programmes (including domestic and foreign direct investment) in neighbouring countries, namely, Laos, Vietnam, Cambodia, Myanmar and the Philippines.

DAYA SAING EKSPOR KARET ALAM TIGA NEGARA ITRC (INDONESIA, THAILAND, MALAYSIA) DI PASAR INTERNASIONAL PERIODE 1994-2018

2020 ◽  
Vol 4 (1) ◽  
pp. 81-87
Author(s):  
Shinta Dwi Ardanari ◽  
Rynalto Mukiwihando
Keyword(s):  
Natural Rubber ◽  
Analytical Method ◽  
International Market ◽  
World Market ◽  
Competitive Advantages ◽  
Market Demand ◽  
Export Share ◽  
Intense Competition ◽  
Time Period ◽  
The World

ABSTRACTShare of Indonesia's export value of natural rubber in the international market is almost always below Thailand, which is one of the competiting countries. The others countries began to become a threat to Indonesia because their exports share of natural rubber showed an increasing. This indicates that there is intense competition in the international market. As a country with the largest plantation area in the world, Indonesia should be superior. But this can be an opportunity to be able to compete in the world market so it is important to be managed more deeply so that it can create competitive advantages that can increase competitiveness. This study aims to determine the position of the competitiveness of natural rubber exports for the three countries of ITRC in the international market. The analytical method used is dynamic RCA. The results showed that all products of natural rubber coded HS 400110, 400121, 400122, 400129 and 400130 were experiencing a decline in growth in the export share of the three countries of ITRC : Indonesia, Thailand and Malaysia, but the market demand conditions for these products were declining in that time period.

Preventing the Retrenchment of the Welfare State: Switzerland's Competitiveness in the World Market for Protection

2011 ◽  
Vol 15 (4) ◽  
pp. 315-335 ◽  
Author(s):  
Michael Nollert ◽  
Sebastian Schief
Keyword(s):  
Welfare State ◽  
World Market ◽  
Service Economy ◽  
Welfare Regime ◽  
Policy Mix ◽  
Social Expenditure ◽  
The World ◽  
Political Entrepreneur ◽  
To Receive ◽  
The Welfare State

Most welfare state typologies still characterize Switzerland as a liberal welfare regime. However, recent research shows that its welfare state did not retrench but instead moved towards the conservative type. Nevertheless, higher social expenditure has not been accompanied by increases in taxation. Moreover, Switzerland managed to overcome the so-called trilemma of the service economy. After analyzing the shift of the Swiss welfare state from a liberal to a conservative welfare regime, we argue that the Swiss economic success story of the twentieth century is based on a favourable policy mix (tax system, labour market, financial sector) used to compete successfully in the world market for protection. We conclude that, as a political entrepreneur, Switzerland has the capability to receive taxes and investments from foreign individuals and enterprises, wealthy residents and high-skilled and well-paid immigrants to finance the welfare state and to overcome the trilemma of the service economy.

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