Reverse ester

[CognisCo-op]

Hello, again. This time asking about something for my job. Amazing I would get two materials things like this in 24 hours.

My supervisor just asked me to do some research on a reverse ester. All he knows about it is identified by the number 2903, and it's an 11 percent reverse ester. Any ideas on where to start?

[Skip]

The only "reverse ester" concept I'm aware of is in the area of organotin mercaptoester stabilizers for rigid PVC. 2903 sounds like a specific product name, and 11% sounds like it could be an 11% tin-containing stabilizer----which would be for twin screw extrusion of pipe or profile.However I don't recognize the scource of the 2903 name.

Classical mercaptoester tins are made with isooctyl mercaptoacetic acid esters, while reverse esters use the reaction product of mercaptoethanol and oleic acid (mercaptoethyl oleate). The SH mercapto group of both esters attaches to the mono/di methyl (or butyl) tin molecule----the main difference being that the carboxyl group from the mercapto ethanol/oleic acid product has a REVERSE configuration to the carboxyl group from the mercaptoacetic/isooctyl product. I wish I could diagram the structural differences, but don't know how on my stupid computer!! "Reverse ester" tin stabilizers are newer technology and generally furnish better color stability to PVC during processing.My old alma mater company, Cincinnati Milacron Chemicals originated this type of tin stabilizer. Milacron became Morton, then Rohm & Haas.

Major producers include Rohm & Haas, Crompton Knowles, Atofina,
Akcros in the U.S., and quite a few European , Asian , and Indian producers. I would try to contact each of the U.S. producers first.
If they don't have a "2903", they probably have their counterpart--- it's a very competitive arena!

Aren't you sorry you asked???:D:D

[Dr. Dick]

Hello, again. This time asking about something for my job. Amazing I would get two materials things like this in 24 hours.

My supervisor just asked me to do some research on a reverse ester. All he knows about it is identified by the number 2903, and it's an 11 percent reverse ester. Any ideas on where to start?

One of the changes to plastics.com is that at the top of the page there is a "Google" search link that you can use. A quick search on "reverse esters" gave 17 results part in the PVC stabilizer area and the  remainder in the pharmacutical area. If you need more info than what Skip provided you may want to look at the Google search items.

All the companies listed by Skip have web sites.

[yingqing]

Hello, again. This time asking about something for my job. Amazing I would get two materials things like this in 24 hours.

My supervisor just asked me to do some research on a reverse ester. All he knows about it is identified by the number 2903, and it's an 11 percent reverse ester. Any ideas on where to start?

reverse ester CH3C6H12C=O-O-CH2CH2SH
NORMAL ESTER SHCH2CH2C=O-O-CH2C6H12CH3

[Dr. Dick]

Major producers include Rohm & Haas, Crompton Knowles(Now Chemtura), Atofina,
Akcros in the U.S., and quite a few European , Asian , and Indian producers. I would try to contact each of the U.S. producers first.
If they don't have a "2903", they probably have their counterpart--- it's a very competitive arena!

Aren't you sorry you asked???:D:D

Mark 2903 from Chemtura

http://www.cromptoncorp.com/ck_prd/broc ... itives.pdf

Found in less than five minutes using a google search.

[yingqing]

i'll give you the tds of 2910 .it's the product of crompton.
MARK® 2910
ORGANOTIN STABILIZER AND EXTERNAL LUBRICANT
DESCRIPTION
Mark 2910 is a liquid methyltin heat stabilizer for rigid PVC pipe extrusion.
Mark 2910 replaces paraffin wax within a typical NSF/PPI pipe formulation
TYPICAL PHYSICAL PROPERTIES
Appearance Light amber liquid with a slight mercaptan odor
Specific Gravity @ 25°C 0.89
Refractive Index @25°C 1.479
Flash Point (closed Cup) >230°F
APPLICATIONS & ADVANTAGES
Mark 2910 has been formulated to provide not only excellent heat stability and color development but also high levels of external lubricity. Its use will eliminate the need for paraffin wax within a typical NSF/PPI pipe formulation.
RECOMMENDATIONS
Mark 2910 should be use between 1.75 to 2.25 phr.
Recommended formulation: (twin screw)
Phr
PVC Resin (IU=92) 100.00
TiO2 1.00
CaCO3 5.00
Calcium Stearate EDG .60 - .80
Oxidized polyethylene wax .15
Mark 2910 1.75 – 2.25
STORAGE & HANDLING PRECAUTIONS
Please see Material Safety Data Sheet (MSDS) for proper handling and storage of this product.