Physical Treatment Of Natural Rubber Or Natural Rubber Containing Material Or Chemical Treatment Of Non-rubber Portion Thereof, E.g., Extraction Of Rubber From Milk Weed, Etc. Patents (Class 528/931)
  • Patent number: 8815965
    Abstract: Processes for recovering natural rubber from an aqueous natural rubber latex that contains extractables and one or more additives and that is essentially free of lignocellulosic plant material are described. Natural rubber in the latex is separated from the water. Preferably, the amount of non-rubber extractables in the natural rubber is reduced by one or more extraction steps yielding a dried natural rubber.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: August 26, 2014
    Assignee: Bridgestone Corporation
    Inventors: William M Cole, Georg G. A. Bohm, Walter Tomaszewski, Yingyi Huang
  • Patent number: 8604124
    Abstract: A rubber-based pressure-sensitive adhesive composition comprising a rubbery polymer, and a natural rubber having a weight-average molecular weight of from 100,000 to 400,000, wherein the amount of the natural rubber is 5 parts by weight or more and less than 100 parts by weight, based on 100 parts by weight of the rubbery polymer.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: December 10, 2013
    Assignee: Nitto Denko Corporation
    Inventors: Tomoo Yamaguchi, Yasunobu Ina
  • Patent number: 7923039
    Abstract: Disclosed is a method and apparatus for the extraction of high molecular weight biopolymers from plants. Specifically, invention described herein relates to the commercial processing of plant material, including that from desert plants native to the southwestern United States and Mexico, such as the guayule plant (Parthenium argentatum), for the extraction of biopolymers, including natural rubbers. More specifically, the invention relates to laboratory to commercial scale extraction of high molecular weight biopolymers from plant materials including the chemical and mechanical processing of the plants and purification of the extracted biopolymer.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: April 12, 2011
    Assignee: Yulex Corporation
    Inventors: Katrina Cornish, Raymond G. McCoy, III, Jeffrey A. Martin, Jali Williams, Anthony Nocera, Jr.
  • Patent number: 7687602
    Abstract: There are provided natural rubber free from substances which cause Type I allergy, a rubber compositions having good processability and physical properties which comprises the natural rubber and other rubber, and a tire product comprising the natural rubber. The natural rubber of the present invention exhibits the above properties by containing substantially no proteins specified by the bands of 14, 31 and 45 kDa by SDS-PAGE.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: March 30, 2010
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Yasuyuki Tanaka, Jitladda Sakdapipanich
  • Patent number: 6923985
    Abstract: Improved matrices and adhesives for tissue repair comprising a biocompatible, bioerodable polymer, said polymer comprising a thermoplastic lactide-containing terpolymer of monomer units derived from lactic acid, glycolic acid, and either caprolactone or valerolactone, which has a water solubility of about 0.01 to about 500 mg/mL at about 25° C. and adhesive strength of about 600 to about 150,000 Pa. The matrix or adhesive can further comprise a filler or a bioactive agent, or both.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: August 2, 2005
    Assignee: DePuy Orthopaedics, Inc.
    Inventors: Dale R. Peterson, Z. David Deng, Todd P. Glancy
  • Publication number: 20020091232
    Abstract: A method of preparing a low allergic natural rubber latex which is less likely to cause allergy, comprising adding a protease having an exopeptidase activity to a natural rubber latex and aging the natural rubber latex, thereby to decompose a protein in the latex to such a degree that the protein and a protein decomposition product, which have a number-average molecular weight of 4500 or more, are not detected; a method of preparing a deproteinized natural rubber latex which is less likely to cause allergy, comprising adding an alkali protease to a natural rubber latex, thereby to decompose a protein in the latex, adding a protease having an exopeptidase activity, thereby to further decompose the protein and a decomposition product thereof in the latex, and removing the protein and the decomposition product thereof; a low allergic natural rubber obtained by a decomposition treatment of a protein, wherein the protein and a protein decomposition product, which have a number-average molecular weight of 4500 or m
    Type: Application
    Filed: November 8, 2001
    Publication date: July 11, 2002
    Inventors: Naoya Ichikawa, Yoshiaki Miyamoto, Masaharu Hayashi
  • Patent number: 6335407
    Abstract: A deproteinized natural rubber substantially free from any protein and a process for producing the same which comprises treating a latex with a protease and a specific surfactant or a combination of specific surfactants and separating rubber particles are disclosed. A method for elevating the green strength of a natural rubber and a method for lowering the green strength of a natural rubber are also disclosed. Furthermore, a means for preventing allergy induced by natural rubber is also disclosed.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: January 1, 2002
    Assignees: Kao Corporation, Sumitomo Rubber Industry Co., Ltd.
    Inventors: Yasuyuki Tanaka, Yuichi Hioki, Naoya Ichikawa
  • Publication number: 20010034384
    Abstract: A process for producing a natural rubber for a pressure-sensitive adhesive, which comprises decreasing a molecular weight of an unmasticated natural rubber by the action of a peptizing agent while dissolving the unmasticated natural rubber in an organic solvent, and a natural rubber-based pressure-sensitive adhesive composition comprising a natural rubber having a weigh average molecular weight Mw of 700,000 or less obtained by the process.
    Type: Application
    Filed: January 24, 2001
    Publication date: October 25, 2001
    Inventors: Tomohide Banba, Yoshihiro Minamizaki, Isao Hirose, Toshiyuki Umehara
  • Patent number: 6299905
    Abstract: Improved matrices for tissue repair comprising a biocompatible, bioerodable polymer which has a water solubility of about 0.01 to about 500 mg/mL at about 25° C. and adhesive strength of about 600 to about 150,000 Pa; and pressure sensitive adhesives for tissue repair which have adhesive strength of about 600 to about 150,000 Pa. The matrix or adhesive can further comprise a filler or a bioactive agent, or both. The matrices and adhesives are tissue-adherent and dough-like so they can be molded to fit a repair site. When used for bone/implant fixation, or as a filler for bone or cartilage repair, gradual short-term bioerosion of the adhesive matrix allows it to be replaced with developing bone or cartilage tissue. When used for release of a bioactive agent, the agent can be mixed into the adhesive matrix well before the implantation procedure. After implantation, the bioactive agent is gradually released as the adhesive matrix biodegrades.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: October 9, 2001
    Assignee: DePuy Orthopaedics, Inc.
    Inventors: Dale R. Peterson, Z. David Deng, Todd P. Glancy
  • Patent number: 6265479
    Abstract: Disclosed are a deproteinizing agent comprising a proteolytic enzyme and one or more cationic surfactants selected from the group consisting of an alkylamine salt, an alkylamine derivative and quaternized compounds thereof; and a method of preparing a cationic deproteinized natural rubber latex, which comprises adding said deproteinizing agent to a field latex or an ammonia-treated latex thereby subjecting the latex to a deproteinization treatment and purifying the rubber particles in the latex.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: July 24, 2001
    Assignees: Sumitomo Rubber Industries, Ltd., Kao Corp.
    Inventors: Naoya Ichikawa, Akihiko Hamada, Masaharu Hayashi
  • Patent number: 6235860
    Abstract: Natural rubber products are made from fig tree (Ficus carica) by homogenizing the plants in an acetone/benzene and separating the rubber-containing phase by centrifugation. F. carica contains about 4% (w/v) natural rubber in latex, and 0.3, 0.1 and 0.1 % in bark, leaf and fruit, respectively. Molecular mass of the natural rubber from F. carica is about 128 kD. The latex serum of F. carica contains only a small numbers of proteins, with a 48 kD and a 25 kD protein as major proteins. Similar to Hevea brasiliensis and Parthenium argentatum Gray, proteins participating in rubber biosynthesis of F. carica are tightly associated with the rubber particles. Natural rubber is made using the latex serum and the proteins in latex, leaf, bark, and fruit of F. carica.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: May 22, 2001
    Assignee: Korea Kuhmo Petrochemical, Co.
    Inventors: Hun-Seung Kang, Kyung-Hwan Han
  • Patent number: 5858150
    Abstract: A pressure-sensitive adhesive comprises an elastomer having a partially oriented and partially crystallized elastomer component. Articles comprising the pressure-sensitive adhesive on a backing or substrate are also disclosed, as are methods of preparing the adhesive and the articles.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: January 12, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David J. Yarusso, Patrick D. Hyde
  • Patent number: 5731358
    Abstract: A process for the manufacture of devulcanized rubbers from a base material composed of scrap rubber products is provided which produces high grade, low viscosity rubber products. The process is carried out in at least two stages, the first stage comprising mixing a polymeric additive to the base material at elevated temperatures and the second stage comprising mixing unvulcanized virgin rubber with the mixture of base material and polymeric additive at elevated temperatures. The process also may comprise a preliminary stage in which a chemically modified epoxidized natural rubber is mixed with the base material at ambient temperature prior to the first stage.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: March 24, 1998
    Inventor: Chandrasekaran Ramayya Pillai
  • Patent number: 5321111
    Abstract: A method for extracting polyisoprenes from cells, comprising the steps of contacting the cells with an organic protein-denaturing compound, rupturing the cells to release the polyisoprene from the cells and recovering the polyisoprene. The preferred protein denaturing compound comprises an aqueous solution of a guanidine salt.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: June 14, 1994
    Inventor: Wan Ji
  • Patent number: 5026641
    Abstract: A process for culturing bacteria is disclosed in which is utilized as a bacterial nutrition a serum byproduced upon treatment of a natural rubber latex. The serum has an ample supply, a low cost, a stable quality and a sufficient activity over a wide variety of bacteria, thus contributing to accelerative growth for aerobic and anaerobic bacteria.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: June 25, 1991
    Assignees: The Yokohama Rubber Co., Ltd., The Board of The Rubber Research Institute of Malaysia
    Inventor: Ayaaki Ishizaki
  • Patent number: 4804741
    Abstract: Processes are described for the recovery of natural rubber from solutions containing guayule rubber and resins. The resinous rubber is dissolved in a lipophilic solvent such as hexane. The rubber is recovered from the solution in high purity on a heated surface immersed in the solution.
    Type: Grant
    Filed: May 9, 1986
    Date of Patent: February 14, 1989
    Assignee: Anver Bioscience Design, Inc.
    Inventors: Anthony J. Verbiscar, Thomas F. Banigan