Resin Removal Or Conversion Patents (Class 528/933)
  • Processes for recovering rubber from natural rubber latex
    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
  • Activator for the depolymerization of polysiloxanes which are crosslinked, optionally contain fillers and/or are uncrosslinked
    Patent number: 6001888
    Abstract: The invention relates to activators for the depolymerization of polysiloxanes which are crosslinked, optionally contain fillers and/or are uncrosslinked, a method for the depolymerization of polysiloxanes which are crosslinked, optionally contain fillers and/or are uncrosslinked, and their use.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: December 14, 1999
    Assignee: GE Bayer Siliconesgmbh & Co.KG
    Inventors: Robert Friebe, Wilhelm Weber, Karl-Heinz Sockel
  • Hypoallergenic natural rubber products from parthenium argentatum (gray) and other non-hevea brasiliensis species
    Patent number: 5717050
    Abstract: Hypoallergenic products are made from Parthenum argentatum (Gray), Ficus elastica and other non-hevea rubber-containing plants by homogenizing the plants in an aqueous medium, filtering the homogenate and separating the rubber-containing phase from the aqueous phase by centrifugation. Optionally, the filtrate may be clarified before separation. The hypoallergenic rubber products do not contain the rubber-associated proteins which are responsible for sensitization in allergic individuals.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: February 10, 1998
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventor: Katrinia Cornish
  • Hypoallergenic natural rubber products from parthenum argentatum (gray) and other non-hevea brasiliensis species
    Patent number: 5580942
    Abstract: Hypoallergenic products are made from Parthenum argentatum (Gray), Ficus elastica and other non-hevea rubber-containing plants by homogenizing the plants in an aqueous medium, filtering the homogenate and separating the rubber-containing phase from the aqueous phase by centrifugation. Optionally, the filtrate may be clarified before separation. The hypoallergenic rubber products do not contain the rubber-associated proteins which are responsible for sensitization in allergic individuals.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: December 3, 1996
    Assignee: The United States of America, as represented by the Secretary of Agriculture
    Inventor: Katrinia Cornish
  • Guayule rubber, resin and bagasse recovery and purification processes
    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
  • Use of rubber solvent-resin solvent and miscella mixtures for extraction-expression of rubber and resins from guayule shrub
    Patent number: 4681929
    Abstract: A process for extracting resin and rubber from guayule plants utilizing a portion of recycled miscella and a fresh solvent system. An expression step is applied to the plants to enhance recovery of resin and rubber extract. The solvent system is preferably an organic polar solvent and a hydrocarbon solvent for rubber for simultaneous resin and rubber extraction containing at least 50% by weight of the hydrocarbon solvent. The process can be a one-step method wherein resin and rubber are generally simultaneously extracted.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: July 21, 1987
    Assignee: The Firestone Tire & Rubber Company
    Inventors: William M. Cole, Steven L. Fenske, David J. Serbin, Shrikant R. Malani, Frank J. Clark, Joanne L. Beattie
  • Solvent fractionation of guayule rubber
    Patent number: 4623713
    Abstract: A method and composition are disclosed wherein guayule rubber is fractionated into desirable weight average molecular weight fractions by a desired solvent system. Oftentime, a plurality of fractionating steps is utilized wherein the desirable molecular weight rubber fraction is precipitated or extracted. High weight average molecular weight rubbers having usually less than 4% by weight of resin content therein are generally desirable because of their favorable physical properties.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: November 18, 1986
    Assignee: The Firestone Tire & Rubber Co.
    Inventors: Robert T. Beinor, William M. Cole
  • Storage of guayule by densification
    Patent number: 4616075
    Abstract: A process and product thereof for densifying guayule shrubs by compression and forming a densified pellet. The densified pellet substantially maintains its molecular weight during storage over a period of weeks without the aid of any inert gas blanket or the like.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: October 7, 1986
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Shrikant R. Malani, Frank J. Clark
  • Process for extracting rubber and by-products from guayule and guayule-like shrubs
    Patent number: 4526959
    Abstract: Rubber, hydrocarbons, i.e., resins, and other useful by-products are extracted from shrubs such as guayule and guayule-like shrubs by a procedure wherein the shrub, after being comminuted, is processed in an aqueous and/or a non-aqueous system. An optional water treatment step can be used to remove water solubles and/or facilitate processing and achieve increased yield of desired by-products.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: July 2, 1985
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Edward L. Kay, Richard Gutierrez
  • Process for extracting rubber and by-products from guayule and guayule-like shrubs
    Patent number: 4435337
    Abstract: Rubber, hydrocarbons, i.e., resins, and other useful by-products are extracted, recovered and isolated from shrubs such as guayule and guayule-like shrubs by a procedure wherein the entire non-defoliated shrub, after being comminuted, is processed in an aqueous and/or a non-aqueous system. An optional water treatment step can be used to remove water solubles and/or facilitate processing and achieve increased yield of desired by-products.
    Type: Grant
    Filed: September 1, 1981
    Date of Patent: March 6, 1984
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Edward L. Kay, Richard Gutierrez