EO/PO Block Co-Polymers

What EO/PO block copolymers are

EO/PO block copolymers are non-ionic surfactants built by adding ethylene oxide and propylene oxide in a defined sequence to a starter (often propylene glycol, ethylene glycol or an amine). Performance is set by total molecular weight, EO percentage and whether the blocks are normal or reverse. Dyna Glycols manufactures catalogue equivalents of common L, P and F types plus fatty-alcohol and oil EO/PO copolymers.

These grades are chosen for low foam, defoaming-adjacent knockdown, rinse aids, emulsion polymerisation and oilfield intermediates. They are not the same as a straight alcohol ethoxylate of similar HLB. Block order matters more than a small shift in total moles.

How Dyna Glycols manufactures EO/PO block copolymers

Alkoxylation is run to the target MW and EO percentage, then released against cloud point, hydroxyl value, pH, colour and water. Reverse-block types (PO-end) foam less than normal-block types of similar MW. State which architecture the formula needs.

Fatty-alcohol EO/PO copolymers (tridecyl, lauryl, decyl, oleyl, stearyl) and random butanol EO/PO grades sit alongside the polyglycol L/P/F equivalents. Custom sequences are quoted after the starter, block order and annual volume.

Typical grades in this range

Identify the starter, MW or an L/P/F equivalent, and EO percentage. Intermediate points are manufactured on request.

• Fatty alcohol EO/PO: tridecyl, lauryl, decyl, oleyl-cetyl, oleyl, stearyl
• Glycerol polyol ~4800 MW; aminopolyol; bisphenol A-2 mole PO
• Random butanol EO/PO: about 1450, 1650 and 4000 MW
• Castor oil EO/PO and nonyl phenol EO/PO
• Polyglycol types (indicative): L-31, L-44, L-61, L-62, L-64, L-68, L-81, L-101; P-84, P-85, P-94; F-38, F-87, F-88, F-108, F-127; reverse 17R2, 17R4, 25R2, 25R4

Where EO/PO block copolymers are used

Machine-wash rinse aids, bottle washers, textile jets and high-pressure cleaners use reverse-block and mid-MW L types for low foam. Defoaming-adjacent knockdown in coatings, paper and fermentation uses selected L and reverse grades.

Oilfield demulsifier intermediates and emulsion polymerisation use defined EO percentage rather than a detergent cloud point. Personal-care and pharma solubilisation use higher-EO F types where a poloxamer-style grade is specified.

If the need is a simple alcohol ethoxylate wetter, use the ethoxylates page. If the need is PO on a fatty alcohol without a block architecture, use propoxylates.

How to specify EO/PO block copolymers

Send starter, normal vs reverse block, target MW, EO percentage, cloud point method and foam test. State whether APEO (nonyl phenol EO/PO) is allowed. For an L-64 or F-127 equivalent, attach MW, %EO and hydroxyl from the existing TDS.

Pack, pour point and drum heating should be agreed for paste and solid F types.

Quality, documents and supply

Lots are released against hydroxyl value, cloud point, pH, water, colour and appearance. SDS and COA follow verification. Foam and cloud point must be checked in the customer electrolyte; water-only cloud point is not always the process number.

Warm high-MW grades until uniform. Keep containers closed. Follow the SDS.

Practical notes on EO/PO block copolymers

L, P and F labels are industry shorthand for liquid, paste and flake at a given MW/%EO. They are not a specification by themselves. Lock MW and EO percentage on the order.

Reverse-block 17R4 / 25R4 types wet with very low foam. They are not drop-in copies of L-64. Run a paired foam test.

Nonyl phenol EO/PO remains a catalogue item for industrial closed-loop use. Several markets restrict APEO. Say so on the enquiry.

Related pages: propoxylates, alkoxylates, phosphate esters, paper chemicals and paints. Request a sample with the foam test and the monomer or crude if oilfield.

Hydroxyl value tracks average chain length. Freeze it once a trial lot is approved so the tenth drum matches the first.

English is the source language for block-order and %EO claims.

Ordering and evaluating EO/PO block copolymers

Send the application, the analytical window and the pack size when you request a laboratory sample of EO/PO block copolymers. SDS, TDS and COA follow a short company check. Handle and store the grade as the SDS describes.