GB1464462A - Process for producing concentrated latex - Google Patents

Process for producing concentrated latex

Info

Publication number
GB1464462A
GB1464462A GB1759474A GB1759474A GB1464462A GB 1464462 A GB1464462 A GB 1464462A GB 1759474 A GB1759474 A GB 1759474A GB 1759474 A GB1759474 A GB 1759474A GB 1464462 A GB1464462 A GB 1464462A
Authority
GB
United Kingdom
Prior art keywords
latex
zinc
ammonium
acid
stabilizer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1759474A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Firestone Inc
Original Assignee
Firestone Tire and Rubber Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Firestone Tire and Rubber Co filed Critical Firestone Tire and Rubber Co
Priority to GB1759474A priority Critical patent/GB1464462A/en
Publication of GB1464462A publication Critical patent/GB1464462A/en
Priority to MY7800015A priority patent/MY7800015A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C1/00—Treatment of rubber latex
    • C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
    • C08C1/06—Preservation of rubber latex
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C1/00—Treatment of rubber latex
    • C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
    • C08C1/075—Concentrating
    • C08C1/10—Concentrating by centrifugation

Abstract

1464462 Concentrated Hevea latex FIRESTONE TIRE & RUBBER CO 22 April 1974 17594/74 Heading C3E A process for producing concentrated latex from fresh Hevea rubber latex, which has an ammonia content of 0À10-0À50% by weight based on the latex and a soluble phosphate level adjusted to a level sufficient to precipitate any magnesium ions present in the latex comprises (A) adding to the rubber latex, preservative in an amount sufficient to inhibit deterioration of the latex by bacterial and enzymatic action for 36 up to 240 hours, and stabilizer in an amount sufficient to provide a mechanical stability (ASTM issue of DÀ1076) in the latex of 300 to 2000 seconds after ageing for 36 to 240 hours; (B) allowing said preserved and stabilized latex to age for 36 to 240 hours, with formation and settling of sludge in said latex; (C) concentrating the resulting sludge-free preserved and stabilized latex by centrifuging to a solids content of 50 to 70% by weight. The sludge may be removed from the preserved and stabilized latex by mechanical means (non-concentrating centrifugal step) during or after ageing, but before concentration. The concentrate may be additionally treated by adjusting the ammonia content to 0À15 to 0À25% by weight and adding further preservative. The substance used to preserve the latex before and/ or after concentration may be selected from formaldehyde; zinc oxide; ammonium pentachlorophenate; potassium pentachlorophenate; sodium pentachlorophenate; boric acid and the alkali metal and ammonium salts thereof; tetraalkali metal and tetra ammonium salts of ethylenediaminetetraacetic acid; sodium or zinc pyridinethione; zinc or alkali metal or ammonium diloweralkyl dithiocarbamates; zinc mercaptobenzothiazole; N -t - butyl - 2 - benzothiazole sulphenamide; and zinc dialkyldithiophosphate or mixtures thereof. The stabilizer is selected from ammonium or alkali metal soluble soaps of saturated or unsaturated fatty acids containing at least ten carbon atoms or an anionic or non-ionic surfactant. The stabilizer may be produced by adding free fatty acid (lauric acid is exemplified) to the latex, said acid reacting with free ammonia in the latex to give the -soap.
GB1759474A 1974-04-22 1974-04-22 Process for producing concentrated latex Expired GB1464462A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1759474A GB1464462A (en) 1974-04-22 1974-04-22 Process for producing concentrated latex
MY7800015A MY7800015A (en) 1974-04-22 1978-12-31 A process for producing concentrated latex

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1759474A GB1464462A (en) 1974-04-22 1974-04-22 Process for producing concentrated latex

Publications (1)

Publication Number Publication Date
GB1464462A true GB1464462A (en) 1977-02-16

Family

ID=10097907

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1759474A Expired GB1464462A (en) 1974-04-22 1974-04-22 Process for producing concentrated latex

Country Status (2)

Country Link
GB (1) GB1464462A (en)
MY (1) MY7800015A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2671913A1 (en) * 2011-02-03 2013-12-11 Bridgestone Corporation Natural rubber, rubber composition using the same, and tire
WO2014069979A1 (en) * 2012-10-29 2014-05-08 Sime Darby Malaysia Berhad An improved method of recovering rubber from skim natural rubber latex
CN111533829A (en) * 2020-05-28 2020-08-14 黄茂芳 Natural latex composite preservative
CN113429498A (en) * 2021-06-22 2021-09-24 海南天然橡胶产业集团金橡有限公司 Preparation method of low-ammonia natural concentrated latex
CN113929977A (en) * 2021-11-05 2022-01-14 中国热带农业科学院橡胶研究所 Ageing-resistant high-strength natural rubber and preparation method thereof
CN114085395A (en) * 2021-12-30 2022-02-25 江苏沃荷乳胶科技股份有限公司 Natural latex product vulcanization process without formaldehyde residue

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2671913A1 (en) * 2011-02-03 2013-12-11 Bridgestone Corporation Natural rubber, rubber composition using the same, and tire
EP2671913A4 (en) * 2011-02-03 2015-12-30 Bridgestone Corp Natural rubber, rubber composition using the same, and tire
WO2014069979A1 (en) * 2012-10-29 2014-05-08 Sime Darby Malaysia Berhad An improved method of recovering rubber from skim natural rubber latex
CN104903355A (en) * 2012-10-29 2015-09-09 森达美马来西亚有限公司 An improved method of recovering rubber from skim natural rubber latex
CN104903355B (en) * 2012-10-29 2016-11-23 森达美马来西亚有限公司 The improved method of rubber is reclaimed from the clear natural rubber latex of glue
CN111533829A (en) * 2020-05-28 2020-08-14 黄茂芳 Natural latex composite preservative
CN113429498A (en) * 2021-06-22 2021-09-24 海南天然橡胶产业集团金橡有限公司 Preparation method of low-ammonia natural concentrated latex
CN113429498B (en) * 2021-06-22 2022-05-24 海南天然橡胶产业集团金橡有限公司 Preparation method of low-ammonia natural concentrated latex
CN113929977A (en) * 2021-11-05 2022-01-14 中国热带农业科学院橡胶研究所 Ageing-resistant high-strength natural rubber and preparation method thereof
CN114085395A (en) * 2021-12-30 2022-02-25 江苏沃荷乳胶科技股份有限公司 Natural latex product vulcanization process without formaldehyde residue

Also Published As

Publication number Publication date
MY7800015A (en) 1978-12-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930422