GB388923A - Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber - Google Patents

Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber

Info

Publication number
GB388923A
GB388923A GB387832A GB387832A GB388923A GB 388923 A GB388923 A GB 388923A GB 387832 A GB387832 A GB 387832A GB 387832 A GB387832 A GB 387832A GB 388923 A GB388923 A GB 388923A
Authority
GB
United Kingdom
Prior art keywords
latex
ozone
hours
rubber
air
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
GB387832A
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.)
Pirelli and C SpA
Original Assignee
Pirelli SpA
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 Pirelli SpA filed Critical Pirelli SpA
Priority to GB387832A priority Critical patent/GB388923A/en
Priority to NL63848A priority patent/NL36331C/xx
Priority to FR749033D priority patent/FR749033A/en
Publication of GB388923A publication Critical patent/GB388923A/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
    • C08C19/00—Chemical modification of rubber
    • C08C19/04—Oxidation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C19/00—Chemical modification of rubber
    • C08C19/08—Depolymerisation

Abstract

Natural and artificial dispersions of rubber and the like are pre-plastified by treatment with ozone, applied by passing a stream of ozonized air or oxygen through the dispersion probably in the presence of an anti-coagulating agent such as ammonia. After treatment the latex is allowed to stand at room temperature for 3-60 hours. If desired a small quantity of a reducing agent substantially inert towards rubber and substantially a non-coagulant such as a sulphite, bisulphite, hydrosulphite, sulphoxilate, or a mixture of hydrosulphite and sulphoxilate is added after the standing period to counteract any tendency to deterioration due to residual excess of ozone. The preplastifying process eliminates either wholly or to a very large extent the usual mastication process and the addition of softening agents. The ozonized gas stream serves as the agitating means as it passes through the latex and ensures uniform contact of the ozone with the latex. In an example a current of air is blown through an ozonizer capable of ozonizing 250 litres of air with 50 milligrams of ozone per litre, the ozonized air is passed for 10 hours through 15 litres of latex maintained at 15-40 DEG C., thus introducing 33 milligrams of ozone per litre. The treated latex is allowed to stand for 24 hours, 150 grams of bisulphite solution are added and the mixture stood for 24 hours when it is ready for use by direct deposition. Specifications 284,608, 292,964, 330,520, [all in Class 70, Indiarubber &c.], and 351,012 are referred to.
GB387832A 1932-02-09 1932-02-09 Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber Expired GB388923A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB387832A GB388923A (en) 1932-02-09 1932-02-09 Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber
NL63848A NL36331C (en) 1932-02-09 1933-01-09
FR749033D FR749033A (en) 1932-02-09 1933-01-13 Processing improvements of rubber latex and similar aqueous rubber dispersions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB387832A GB388923A (en) 1932-02-09 1932-02-09 Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber

Publications (1)

Publication Number Publication Date
GB388923A true GB388923A (en) 1933-03-09

Family

ID=9766574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB387832A Expired GB388923A (en) 1932-02-09 1932-02-09 Improvements in or relating to the treatment of rubber latex and like aqueous dispersions of rubber

Country Status (3)

Country Link
FR (1) FR749033A (en)
GB (1) GB388923A (en)
NL (1) NL36331C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009156163A1 (en) * 2008-06-27 2009-12-30 Akzo Nobel N.V. Redispersible polymer powder composition
US8491969B2 (en) 2008-06-27 2013-07-23 Akzo Nobel N.V. Redispersible polymer powder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009156163A1 (en) * 2008-06-27 2009-12-30 Akzo Nobel N.V. Redispersible polymer powder composition
US8491969B2 (en) 2008-06-27 2013-07-23 Akzo Nobel N.V. Redispersible polymer powder
US8623462B2 (en) 2008-06-27 2014-01-07 Akzo Nobel N.V. Redispersible polymer powder composition

Also Published As

Publication number Publication date
NL36331C (en) 1935-09-16
FR749033A (en) 1933-07-13

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