Dispersing agent for suspension polymerization of vinyl compound
US-2016347883-A1 · Dec 1, 2016 · US
A Process For Reduction Of Residual Acidity Of Halogenated Polymer
US2016159945A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016159945-A1 |
| Application number | US-201414907108-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jul 24, 2014 |
| Priority date | Jul 24, 2013 |
| Publication date | Jun 9, 2016 |
| Grant date | — |
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Abstract
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The present disclosure provides a process for the reduction of residual acidity of halogenated polymer. The process involves treating the halogenated polymer to a physical process such as rotary vacuum drying and then neutralizing the treated halogenated polymer with alkaline metal salt solutions. The process requires less quantity of an economic neutralizing agent/base during chemical treatment, thus improving process economy without prejudicing quality of the final halogenated polymer.
First claim
Opening claim text (preview).
1 . A process for the reduction of residual acidity of a halogenated polymer, said process comprising: i. subjecting the halogenated polymer to rotary vacuum drying; and ii. neutralizing the rotary vacuum dried halogenated polymer with alkaline metal salt solution. 2 . The process as claimed in claim 1 , wherein the rotary vacuum drying is carried out for a period of 1-3 hours, at a temperature in the range of 20 to70° C. and under a vacuum in the range of 1 to 3 torr. 3 . The process as claimed in claim 1 , wherein the alkaline metal salt solution is a hydroxide of an alkaline metal selected from the group consisting of Calcium (Ca), Magnesium (Mg), Beryllium (Be), Strontium (Sr) and Barium (Ba). 4 . The process as claimed in claim 1 , wherein the residual acidity of the halogenated polymer is reduced to 2000 ppm and below, simultaneously maintaining yellowness index of the halogenated polymer to 3.5 and below, during the process. 5 . The process as claimed in claim 1 , wherein the rotary vacuum dried halogenated polymer is neutralised with 0.005M to 0.02M calcium hydroxide solution at a temperature in the range of 20 to 40° C. 6 . The process as claimed in claim 1 , wherein the halogenated polymer is chlorinated polyvinyl chloride (CPVC).
Assignees
Inventors
Classifications
- C08F114/06Primary
Vinyl chloride · CPC title
- C08F8/20Primary
Halogenation · CPC title
by reaction with free halogens · CPC title
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Frequently asked questions
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- What does patent US2016159945A1 cover?
- The present disclosure provides a process for the reduction of residual acidity of halogenated polymer. The process involves treating the halogenated polymer to a physical process such as rotary vacuum drying and then neutralizing the treated halogenated polymer with alkaline metal salt solutions. The process requires less quantity of an economic neutralizing agent/base during chemical treatmen…
- Who is the assignee on this patent?
- Reliance Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F114/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jun 09 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).