Multi-block coupled polyoxyalkylene copolymer surfactants
AssigneeBASF Wyandotte Corporation
InventorWilliam K. Langdon
Life of this patent
Estimating the term…
Abstract
Multi-block coupled polyoxyalkylene copolymer surfactants are prepared from individual blocks of polymers and copolymers of alkylene oxides by reacting these with bifunctional compounds to form polycarbonate esters and polyformals.
Claims2
A polycarbonate compound having the formula ##STR6## wherein Y is the residue of an alkylene glycol containing therein two terminal hydroxyl groups minus the terminal hydrogen atoms, M is a hydrophilic chain of units selected from the group consisting of oxyethylene and oxyethylene-oxypropylene units wherein the oxyethylene content of said hydrophilic chain is from about 75 to 100 weight percent and the oxypropylene content is from 0 to about 25 weight percent, the number of oxyethylene and oxypropylene groups in M being from about 2 to about 15,
- N is a hydrophobic chain of units selected from the group consisting of oxypropylene units and oxyethylene-oxypropylene units wherein the oxypropylene content is from about 75 to 100 weight percent and the oxyethylene content is from 0 to about 25 weight percent, the number of oxyethylene and oxypropylene groups in N being from about 2 to about 10, wherein ##STR7## are linked together either in a random or an ordered manner, R is M or N, and a and b are integers from 2 to 20 in a ratio between 1:9 to 9:1.
A polycarbonate compound having the formula ##STR8## wherein Q is selected from the group consisting of methyl, ethyl and propyl,
- Y is the residue of an alkylene glycol containing therein two terminal hydroxyl groups minus the terminal hydrogen atoms, M is a hydrophilic chain of units selected from the group consisting of oxyethylene and oxyethylene-oxypropylene units wherein the oxyethylene content of said hydrophilic chain is from about 75 to 100 weight percent and the oxypropylene content is from 0 to about 25 weight percent, the number of oxyethylene and oxypropylene groups in M being from about 2 to about 15,
- N is a hydrophobic chain of units selected from the group consisting of oxypropylene units and oxyethylene-oxypropylene units wherein the oxypropylene content is from about 75 to 100 weight percent and the oxyethylene content is from 0 to about 25 weight percent, the number of oxyethylene and oxypropylene groups in N being from about 2 to about 10, wherein ##STR9## are linked together either in a random or an ordered manner, R is M or N, and a and b are integers from 2 to 20 in a ratio between 1:9 to 9:1.
Dependencies are inferred from the claim text.